DATA SHEET
AAT3601
Total Power Solution for Portable Applications
General Description
Features
The AAT3601 is a member of Skyworks' Total Power
Management IC (TPMICTM) product family. It contains a
single-cell Lithium Ion/Polymer battery charger, a fully
integrated step-down converter and 5 low dropout (LDO)
regulators. The device also includes 2 load switches for
dynamic power path/sleep mode operation, making it
ideal for small portable short-range communications
enabled mobile devices and telephones.
• Voltage Regulator VIN Range: 4.5V to 6V
• Complete Power Integration
▪ Integrated Load Switches to Power Converters from
AC Adapter or Battery Automatically
• Low Standby Current
▪ 200μA (typ) w/LDO1, LDO2 and LDO5 Active,
No Load
• One Step-Down Buck Converter (NP)
▪ 1.24V, 300mA Output
▪ 1.5MHz Switching Frequency
▪ Fast Turn-On Time (120μs typ)
• Five LDOs Programmable by I2C
▪ LDO1: 3.4V, 150mA (PE)
▪ LDO2: 3.4V, 300mA (NP)
▪ LDO3: 1.24V, 300mA (PE)
▪ LDO4: 1.85V, 300mA (NP)
▪ LDO5: 1.85V, 300mA (PE)
▪ PSRR: 60dB @10kHz
▪ Noise: 50μVrms
• One Battery Charger
▪ Digitized Thermal Regulation
▪ Charge Current Programming up to 1.4A
▪ Charge Current Termination Programming
▪ Automatic Trickle Charge for Battery Preconditioning
(2.8V Cutoff)
• Watchdog (WDI) Timer Input
▪ Two Reset (RSTIN, RSTLPW) Timer Outputs
• Separate Enable Pins for PE and NP Supplies
• Digital Programming of Major Parameters via I2C
• Over-Current Protection
• Over-Temperature Protection
• 5x5x0.75mm TQFN55-36 Package
The battery charger is a complete thermally regulated
constant current/constant voltage linear charger. It
includes an integrated pass device, reverse blocking protection, high accuracy current and voltage regulation,
charge status, and charge termination. The charging
current and the charge termination current as well as
recharge voltage are programmable with either an external resistor and/or by a standard I2C interface.
The step-down DC/DC converter is integrated with internal compensation and operates at a switching frequency
of 1.5MHz, thus minimizing the size of external components while keeping switching losses low and efficiency
greater than 95%. All LDO output voltages are programmable using the I2C interface.
The five LDOs offer 60dB power supply rejection ratio
(PSRR) and low noise operation making them suitable for
powering noise-sensitive loads. The LDOs and DC/DC
converter are separated into Permanent-Enabled (PE)
and Non-Permanent (NP) enabled supplies.
All six voltage regulators operate with low quiescent current. The total no load current when the 3 PE LDOs are
enabled is only 200μA.
The device includes a watchdog timer input and two
reset outputs for the watchdog and LDO regulation. The
device also can be programmed through a standard I2C
interface.
The AAT3601 is available in a thermally enhanced low
profile 5x5x0.75mm 36-pin TQFN package.
Applications
•
•
•
•
•
•
Digital Cameras
GSM or CDMA Cellular Phones
Handheld Instruments
PDAs and Handheld Computers
Portable Media Players
Short-Range Communication Headsets
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202210B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 20, 2013
1
DATA SHEET
AAT3601
Total Power Solution for Portable Applications
Typical Application
To AVIN1,AVIN2, PVIN
SYSOUT
System Supply
SYSOUT
LDO
500mΩ
100mΩ
BAT
CHGIN
5V from
AC Adapter or USB Port
+
10μF
To
SYSOUT
-
10μF
1 cell
Li+
battery
100k
STAT
Charger
Control
STAT_BAT
ISET
TS
CT
ENBAT
To
SYSOUT
Ref
USE_USB
100k
1.24k
0.1μF
SDA
100k
10kW
NTC
For BAT
Temp sense
SCL
To SYSOUT
WDI
PVIN
μC
UVLO
TEMP_FLAG
I2C
and
Enable/Reset
Control
EN_SYS
To
OUT1
100k
100k
NP 1.24V
300mA
2.2μH
Step-down
BUCK
Ref
RSTLPW
To
OUT1
LX
VIN
10μF
4.7μF
OUTBUCK
PGND
Enable
RSTIN
EN_PE
VIN
REF
EN_NP
CNOISE
0.01μF
AVIN1
AVIN2
VIN
Ref
To SYSOUT
LDO1
LDO2
Enable
VIN
Ref
LDO3
Enable
VIN
Ref
LDO4
Enable
VIN
Ref
LDO5
Enable
Ref
VIN
Enable
To SYSOUT
AGND
OUT5
PE
1.85V, 300mA
10μF
2
OUT3
OUT4
NP
1.85V, 300mA
PE
1.24V, 300mA
10μF
OUT1
OUT2
NP
3.4V, 300mA
10μF
PE
3.4V, 150mA
10μF
22μF
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202210B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 20, 2013
DATA SHEET
AAT3601
Total Power Solution for Portable Applications
Pin Descriptions
Pin #
Symbol
1
WDI
2
TEMP_FLAG
3
EN_SYS
4
STAT_BAT
5
EN_PE
6
EN_NP
7
8
9
10
11
12
13
14
15
16
17
SGND
SGND
OUT5
OUT4
AVIN2
OUT3
OUT2
AVIN1
OUT1
AGND
CNOISE
18
RSTLPW
19
RSTIN
20
21
22
23
LX
PGND
PVIN
OUTBUCK
24, 25
SYSOUT
26, 27
28
BAT
CHGIN
29
USE_USB
30
ENBAT
31
TS
32
ISET
33
CT
34
35
36
STAT
SDA
SCL
EP
EP
Function
Watchdog timer input. Clock input from processor. If no clock input is detected for 60ms, it will reset RSTIN.
Open drain output which pulls low when an over temperature shutdown occurs in the regulator or the charger and when the thermal loop in the charger is activated.
Active Low Enable for the system. An internal pull-up resistor (150kΩ) keeps the pin pulled up to an internal
supply to keep the system off when there is no CHGIN input. Connect a normally-open pushbutton switch
from this pin to GND. To filter noise internally, there is an internal 100μs debounce delay circuit.
Open Drain Output for Battery Charger Status. Same function as STAT pin but with opposite polarity.
Active Low Enable for Permanently-Enabled Supplies: LDO1, LDO3, and LDO5. (This pin is internally pulled
low with 250nA)
Active High Enable for Non-Permanent Supplies: Buck, LDO2, and LDO4 (This pin is internally pulled low
with 250nA)
Signal ground
Signal ground
Output for LDO5 (when disabled, this pin is pulled down with 10kΩ)
Output for LDO4 (when disabled, this pin is pulled down with 10kΩ)
Analog voltage input. Must be tied to SYSOUT on the PCB.
Output for LDO3 (when disabled, this pin is pulled down with 10kΩ)
Output for LDO2 (when disabled, this pin is pulled down with 10kΩ)
Analog voltage input. Must be tied to SYSOUT on the PCB.
Output for LDO1 (when disabled, this pin is pulled down with 10kΩ)
Signal ground
Noise Bypass pin for the internal reference voltage. Connect a 0.01μF capacitor to AGND.
Open Drain Reset output. Pulled low internally when any Permanent Supply (LDO1, LDO3, LDO5) are not in
regulation. Releases High 800ms (typ) after all supplies are in regulation.
Open Drain Reset output. Pulled low internally when any Non-Permanent Supply (Buck, LDO2, or LDO4) are
not in regulation. Releases High 10ms (typ) after all supplies are in regulation.
Step-down Buck converter switching node. Connect an inductor between this pin and the output.
Power Ground for step-down Buck converter.
Input power for step-down Buck converter. Must be tied to SYSOUT.
Feedback input for the step-down Buck converter.
System Power output. Connect to the input voltage pins PIN, AVIN1/2 for the step-down converter and
LDOs and other external supply requirements.
Connect to a Lithium-Ion Battery.
Power input from either external Adapter or USB port.
When pulled high, fast charge current is set to 100mA regardless of the resistor value present on the ISET
pin. Additionally, the CHGIN-SYSOUT LDO will be disabled and the BAT-SYSOUT load switch will be enabled.
Active low enable for the battery charger (Internally pulled low when floating)
Battery Temperature Sense pin with 75μA output current. Connect the battery’s NTC resistor to this pin
and ground.
Charge current programming input pin. Can be used to monitor charge current.
Charger Safety Timer Pin. A 0.1μF ceramic capacitor should be connected between this pin and GND.
Connect directly to GND to disable the timer function.
Open drain output for battery charging status.
I2C serial Data pin, open drain; requires a pullup resistor.
I2C serial Clock pin, open drain; requires a pullup resistor.
The exposed thermal pad (EP) must be connected to board ground plane and pins 16 and 21. The ground
plane should include a large exposed copper pad under the package for thermal dissipation (see package
outline).
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202210B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 20, 2013
3
DATA SHEET
AAT3601
Total Power Solution for Portable Applications
Pin Configuration
SCL
SDA
STAT
CT
ISET
TS
ENBAT
USE_USB
CHGIN
TQFN55-36
(Top View)
36
WDI
TEMP_FLAG
EN_SYS
STAT_BAT
EN_PE
EN_NP
SGND
SGND
OUT5
35
34
33
32
31
30
29
28
1
27
2
26
3
25
4
24
5
23
6
22
7
21
8
20
9
19
11
12
13
14
15
16
17
18
OUT4
AVIN2
OUT3
OUT2
AVIN1
OUT1
AGND
CNOISE
RSTLPW
10
BAT
BAT
SYSOUT
SYSOUT
OUTBUCK
PVIN
PGND
LX
RSTIN
4
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202210B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 20, 2013
DATA SHEET
AAT3601
Total Power Solution for Portable Applications
Absolute Maximum Ratings1
TA = 25°C unless otherwise noted.
Symbol
VIN
Power and Logic Pins
TJ
Ts
TLEAD
Description
Input Voltage, CHGIN, BAT
Maximum Rating
Operating Junction Temperature Range
Storage Temperature Range
Maximum Soldering Temperature (at leads, 10 sec)
Value
Units
-0.3 to 6.5
VIN + 0.3
-40 to 150
-65 to 150
300
V
V
°C
°C
°C
Value
Units
25
4
°C/W
W
Recommended Operating Conditions2
Symbol
θJA
PD
Description
Thermal Resistance
Maximum Power Dissipation
1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions other than the operating conditions
specified is not implied. Only one Absolute Maximum Rating should be applied at any one time.
2. Thermal Resistance was measured with the AAT3601 device on the 4-layer FR4 evaluation board in a thermal oven. The amount of power dissipation which will cause the
thermal shutdown to activate will depend on the ambient temperature and the PC board layout ability to dissipate the heat. See Figures 13-16.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202210B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 20, 2013
5
DATA SHEET
AAT3601
Total Power Solution for Portable Applications
Electrical Characteristics1
VIN = 5V, VBAT = 3.6V, -40C ≤ TA ≤ +85C, unless otherwise noted. Typical values are TA = 25C.
Symbol
Description
Power Supply
VCHGIN
CHGIN Input Voltage
IQ
Battery Standby current
ISHDN
Battery Shutdown Current
Under-Voltage Lockout for CHGIN
UVLO
Battery Under-Voltage Lockout
IBAT
Leakage Current from BAT Pin
Reset Timers
tRSTIN
Reset Timer for Non-Permanent Supplies
tRSTLPW
Reset Timer for Permanent Supplies
RESETTHR
RESET Comparator Threshold
tWDI
Watchdog Timeout Period
WDI Pulse Width
WDIPW
WDITHRL
WDI Input Threshold VIL
WDITHRH
WDI Input Threshold VIH
WDILK
WDI Input Current
Charger Voltage Regulation
VBAT_REG
Output Charge Voltage Regulation
VMIN
Preconditioning Voltage Threshold
VRCH
Battery Recharge Voltage Threshold
Conditions
Min
Typ
4.5
LDO1 + LDO2 + LDO5, No Load
EN_SYS, EN_PE = High, EN_NP = Low
CHGIN rising
CHGIN falling
BAT rising
BAT falling
VBAT = 4V, VCHGIN = 0V
Buck, OUT2, and OUT4 in Regulation
OUT1, OUT3, and OUT5 in Regulation
For Each Output Falling, Typical
Hysteresis = 2.7%
Max
Units
6
V
μA
μA
V
V
V
V
μA
200
4.25
4.15
2.6
2.35
2
10.0
4.5
5
5
600
10
800
15
1000
88.3
91.3
94.3
50
0.1
1
ms
ms
% of
typ
ms
μs
V
V
μA
70
0.4
WDI = 0 or SYSOUT
0C ≤ TA ≤ +70C
(No trickle charge option can be made
available)
I2C Recharge Code = 00 (default)
I2C Recharge Code = 01
I2C Recharge Code = 10
I2C Recharge Code = 11
1.2
-1
4.158
4.200
4.242
V
2.6
2.8
3.0
V
4.00
4.05
4.10
4.15
V
V
V
V
Charger Current Regulation
ICH_CC
KI_SET
Constant-Current Mode Charge Current
Charge Current Set Factor: ICH_CC/IISET
ICH_PRE
Preconditioning-Charge Current
ICH_TERM
Charge Termination Threshold Current
RISET = 1.24k (for 0.8A), USE_USB =
Low, I2C ISET code = 000, VBAT = 3.6V,
VCHGIN = 5.0V
USE_USB = High, I2C ISET code = 000,
VBAT = 3.6V
Constant-Current mode, VBAT = 3.6V
RISET = 1.24k; USE_USB = Low
I2C ISET code = 000, USE_USB = High
I2C Term code = 00 (default)
I2C Term code = 01
I2C Term code = 10
I2C Term code = 11
720
800
880
mA
85
100
115
800
12
50
5
10
15
20
1. Specification over the –40°C to +85°C operating temperature range is assured by design, characterization and correlation with statistical process controls.
6
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202210B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 20, 2013
% ICH_CC
mA
% ICH_CC
DATA SHEET
AAT3601
Total Power Solution for Portable Applications
Electrical Characteristics1
VIN = 5V, VBAT = 3.6V, -40C ≤ TA ≤ +85C, unless otherwise noted. Typical values are TA = 25C.
Symbol
Description
Charging Devices
RDS(ON)
Charging Transistor ON Resistance
Logic Control / Protection
VEN_PE or EN_NP
Input High Threshold
VEN_PE or EN_NP
Input Low Threshold
VSTAT, VSTAT_BAT,
Output Low Voltage
VTEMP_FLAG
ISTAT, ISTAT_BAT,
Output Pin Current Sink Capability
ITEMP_FLAG
VOVP
Over Voltage Protection Threshold
VOCP
Over Current Protection Threshold
TC
Constant Current Mode Time Out
TK
Trickle Charge Time Out
TV
Constant Voltage Mode Time Out
Current Source from TS Pin
ITS
TS1
TS Hot Temperature Fault
TS2
TS Cold Temperature Fault
TLOOP_IN
TLOOP_OUT
TREG
Load Switches
RDS(ON),BAT-SYSOUT
RDS(ON),CHGIN-SYSOUT
Thermal Loop Entering Threshold
Thermal Loop Exiting Threshold
Thermal Loop Regulation
/ SYSOUT LDO
On Resistance of BAT-SYSOUT Load
Switch
On Resistance of CHGIN-SYSOUT
Load Switch
SYSOUT LDO Input Voltage Range
SYSOUT LDO Output Voltage
Output Current
ISYSOUT
Step-Down Buck Converter
VOUTBUCK
Output Voltage Accuracy
Buck Load Regulation
ILIMOUTBUCK
RDS(ON)L
RDS(ON)H
FOSC
TS
Buck Ground Pin Current
P-Channel Current Limit
High Side Switch On-Resistance
Low Side Switch On-Resistance
Oscillator Frequency
Start-Up Time
Conditions
Min
Typ
Max
Units
0.6
0.9
Ω
0.4
V
V
0.4
V
8
mA
71
4.3
105
3
TC / 8
3
75
79
V
%VCS
Hours
Hours
Hours
μA
318
331
346
VIN = 5V
1.4
Isink = 4mA
CCT = 100nF, VCHGIN = 5V
Falling Threshold
Hysteresis
Rising Threshold
Hysteresis
2.30
25
2.39
25
115
85
100
mV
2.48
V
mV
°C
°C
°C
VBAT = 3.6V
100
150
mΩ
VCHGIN = 4.5V
0.5
0.75
Ω
3.4
1.5
3.9
4.2
V
A
1.203
1.24
1.277
V
4.5
ISYSOUT < 900mA, VCHGIN = 4.5V to 6.0V
VCHGIN = 5V
IOUTBUCK = 0 to 300mA; VIN = 2.7V to
5.5V
Load = 100μA to 300mA, PVIN = 3.6V,
VOUTBUCK = 1.2V
No load
TA = 25°C
From Enable to Regulation;
COUTBUCK = 4.7μF, CNOISE = On
V
0.2
%
45
0.8
0.8
0.8
1.5
μA
A
Ω
Ω
MHz
100
μs
1. Specification over the –40°C to +85°C operating temperature range is assured by design, characterization and correlation with statistical process controls.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202210B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 20, 2013
7
DATA SHEET
AAT3601
Total Power Solution for Portable Applications
Electrical Characteristics1
VIN = 5V, VBAT = 3.6V, -40C ≤ TA ≤ +85C, unless otherwise noted. Typical values are TA = 25C.
Symbol
LDO1
VOUT1
Description
Conditions
Output Voltage Accuracy
LDO Ground Pin Current
Output Current
Output Current Limit
Dropout Voltage
IOUT1 = 0 ~ 150mA, VAVINx: 3.3V ~ 5.5V
For Each LDO With No Load
IOUT1
ILIM1
VDO1
VOUT1/
Line Regulation
(VOUT1VIN1)
VOUT1
Load Regulation
PSRR
Power Supply Rejection Ratio
Ts
Start Up Time
LDO2
VOUT2
Output Voltage Accuracy
IOUT2
Output Current
ILIM2
Output Current Limit
VDO2
Dropout Voltage
VOUT2/
Line Regulation
(VOUT2VIN2)
VOUT2
Load Regulation
PSRR
Power Supply Rejection Ratio
Ts
Start Up Time
LDO3, LDO4, and LDO5
VOUTx
Output Voltage Accuracy
IOUTx
Output Current
ILIMx
Output Current Limit
VDOx
Dropout Voltage
VOUTx/
Line Regulation
(VOUTxVINx)
VOUTx
Load Regulation
PSRR
Power Supply Rejection Ratio
eN
Output Noise Voltage
Ts
Start Up Time
Logic Control
VIH
Enable Pin Logic High Level
VIL
Enable Pin Logic Low Level
Thermal
Over Temperature Shutdown
TSD
Threshold
Over Temperature Shutdown
THYS
Hysteresis
Min
Typ
Max
Units
+3
180
%
μA
mA
mA
mV
0.1
%/V
-3
45
150
1000
90
IOUT1 = 150mA
IOUT1 = 10mA, 3.6V < VAVINx < 5.5V
IOUT1 = 0.5mA ~ 150mA
IOUT1 = 10mA, COUT1 = 22μF, 100Hz ~ 10KHz
From Enable to Regulation; C OUT1 = 22μF, CNOISE = On
IOUT2 = 0 ~ 300mA, VAVINx: 3.3V ~ 5.5V
40
60
3.5
-3
300
IOUT2 = 10mA, 3.6V < VAVINx < 5.5V
Load: 0.5mA ~ 300mA
IOUT2 = 10mA, COUT2 = 10μF, 10 ~ 10KHz
From Enable to Regulation; COUT2 = 10μF, CNOISE = On
-3
300
0.1
%/V
mV
dB
ms
+3
%
mA
mA
mV
0.1
%/V
1000
180
IOUTX = 10mA, 3.6V < VAVINx < 5.5V
IOUTX = 0.5mA ~ 300mA
IOUTX = 10mA, COUTx = 10μF, 10 ~ 10KHz
IOUTX = 10mA, Power BW: 10kHz ~ 100KHz
From Enable to Regulation; COUTX = 10μF, CNOISE = On
40
60
50
1.2
mV
dB
μVrms
ms
1.4
0.4
V
V
140
˚C
15
˚C
1. Specification over the –40°C to +85°C operating temperature range is assured by design, characterization and correlation with statistical process controls.
8
%
mA
mA
mV
40
60
1.7
IOUTX = 150mA
EN_PE, EN_NP
+3
1000
180
IOUT2 = 150mA
IOUTX = 0 ~ 300mA, VAVINx: 3.3V ~ 5.5V
mV
dB
ms
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202210B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 20, 2013
DATA SHEET
AAT3601
Total Power Solution for Portable Applications
Electrical Characteristics1
VIN = 5V, VBAT = 3.6V, -40C ≤ TA ≤ +85C, unless otherwise noted. Typical values are TA = 25C.
Symbol
Description
Conditions
SCL, SDA (I2C interface)
Clock Frequency
FSCL
TLOW
Clock Low Period
THIGH
Clock High Period
THD_STA
Hold Time START Condition
TSU_STA
Setup Time for Repeat START
Data Setup Time
TSU_DTA
THD_DAT
Data Hold Low
TSU_STO
Setup Time for STOP Condition
TBUF
Bus Free Time Between STOP and START Condition
VIL
Input Threshold Low
Input Threshold High
VIH
II
Input Current
VOL
Output Logic Low (SDA)
Min
Typ
0
1.3
0.6
0.6
0.6
100
0
0.6
1.3
2.7V ≤ VIN ≤ 5.5V
2.7V ≤ VIN ≤ 5.5V
Max
Units
400
KHz
μs
μs
μs
μs
ns
μs
μs
μs
V
V
μA
V
0.9
0.4
1.4
-1.0
1.0
0.4
IPULLUP = 3mA
Basic I2C Timing Diagram
SDA
TSU_DAT
TLOW
THD_STA
TBUF
SCL
THD_STA
THD_DAT
THIGH
TSU_STA
TSU_STO
1. Specification over the –40°C to +85°C operating temperature range is assured by design, characterization and correlation with statistical process controls.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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9
DATA SHEET
AAT3601
Total Power Solution for Portable Applications
Typical Characteristics – Charger
Charging Current vs. Battery Voltage
Preconditioning Threshold Voltage
vs. Temperature
(RISET = 1.24kΩ
Ω)
900
2.808
2.806
VCHGIN = 5.5V
700
600
2.804
VCHGIN = 5.0V
500
400
VMIN (V)
ICH (mA)
2.810
VCHGIN = 6.0V
800
VCHGIN = 4.5V
300
2.802
2.798
2.796
2.794
100
2.792
2.5
2.9
3.3
3.7
4.1
2.790
-50
4.5
VCHGIN = 6.0V
2.800
200
0
VCHGIN = 5.5V
VCHGIN = 5.0V
-25
Battery Voltage (V)
0
VCHGIN = 4.5V
25
50
75
100
Temperature (°C)
Preconditioning Charge Current vs. Temperature
Recharge Voltage Threshold vs. Temperature
(VBAT = 2.5V, RSET = 1.24kΩ)
(VRCH set to 4.0V by I2C)
115
110
4.05
4.04
105
4.03
VRCH (V)
ICH_PRE (mA)
4.06
VCHGIN = 6.0V
100
95
VCHGIN = 5.5V
VCHGIN = 5.0V
VCHGIN = 4.5V
90
4.02
VCHGIN = 5.5V
4.01
3.99
VCHGIN = 5.0V
VCHGIN = 4.5V
3.98
85
3.97
80
-50
-25
0
25
50
75
3.96
-50
100
-25
Temperature (°C)
4.25
100
4.24
90
50
75
100
80
VCHGIN = 6.0V
VCHGIN = 5.5V
4.22
ICH_TERM (mA)
VBAT_REG (V)
25
Charge Termination Threshold Current
vs. Temperature
4.23
4.21
4.20
4.19
VCHGIN = 5.0V
4.18
VCHGIN = 4.5V
4.17
70
VCHGIN = 6.0V
VCHGIN = 5.5V
60
50
40
30
VCHGIN = 5.0V
20
VCHGIN = 4.5V
10
-50
-25
0
25
50
Temperature (°C)
10
0
Temperature (°C)
Output Charge Voltage Regulation vs. Temperature
(End of Charge Voltage)
4.16
VCHGIN = 6.0V
4.00
75
100
0
-50
-25
0
25
50
Temperature (°C)
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75
100
DATA SHEET
AAT3601
Total Power Solution for Portable Applications
Typical Characteristics – Charger (continued)
Constant Current Mode Charge Current
vs. Temperature
Constant Current Mode Charge Current
vs. Input Voltage
(VBAT = 3.6V; RISET = 1.24kΩ
Ω)
900
VCHGIN = 6.0V
VCHGIN = 4.5V
880
860
700
ICH_CC (mA)
ICH_CC (mA)
800
VCHGIN = 5.5V
600
VCHGIN = 5.0V
500
840
VBAT = 3.3V
820
800
780
VBAT = 3.6V
VBAT = 4.1V
760
740
400
300
(RSET = 1.24kΩ
Ω)
900
720
-50
-25
0
25
50
Temperature (°C)
75
100
700
4.5
4.75
5
5.25
5.5
5.75
6
CHGIN Voltage (V)
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11
DATA SHEET
AAT3601
Total Power Solution for Portable Applications
Typical Characteristics – Step-Down Buck Converter
Step-Down Buck Efficiency vs. Output Current
Step-Down Buck Load Regulation
vs. Output Current
(VOUT = 1.24V; L = 2.2µH)
100
Load Regulation (%)
Efficiency (%)
80
70
60
50
VCHGIN = 4.5V
VCHGIN = 5V
VCHGIN = 5.5V
VCHGIN = 6V
VBAT = 4.2V
VBAT = 3.6V
VBAT = 3V
40
30
20
10
0
(VOUT = 1.24V; L = 2.2µH)
0.5
90
1
10
100
0.4
0.3
0.2
0.1
0.0
VCHGIN = 4.5V
VCHGIN = 5V
VCHGIN = 5.5V
VCHGIN = 6V
VBAT = 4.2V
VBAT = 3.6V
VBAT = 3V
-0.1
-0.2
-0.3
-0.4
-0.5
1000
1
10
Step-Down Buck Line Regulation
vs. CHGIN and Battery Input Voltage
(IOUT = 10mA)
1.248
0.4
1.246
0.3
1.244
0.2
VOUT (V)
Line Regulation (%)
0.5
0.1
0
IOUT = 1mA
IOUT = 10mA
IOUT = 50mA
IOUT = 100mA
IOUT = 200mA
IOUT = 300mA
-0.2
-0.3
-0.4
-0.5
2.5
3
1000
Step-Down Buck Output Voltage vs. Temperature
(VOUT = 1.24V; L = 2.2µH)
-0.1
100
Output Current (mA)
Output Current (mA)
1.242
1.240
VCHGIN = 6.0V
VCHGIN = 5.5V
VCHGIN = 5V
VCHGIN = 4.5V
VBAT = 4.2V
VBAT = 3.6V
VBAT = 3V
1.238
1.236
VBAT
3.5
4 4.2
1.234
VCHGIN
4.5
5
5.5
1.232
-50
6
-25
0
25
50
75
100
Temperature (°C)
Input VBAT, VCHGIN (V)
Load Transient Response Step-Down Buck
(10mA to 150mA; VBAT = 3.6V; VOUT = 1.24V; COUT = 4.7µF)
1.24
1.20
1.16
4.5
4.0
3.5
3.0
Time (100µs/div)
12
1.30
350
1.25
300
1.20
250
200
150
100
50
0
Time (100µs/div)
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Load Current
(bottom) (mA)
Output Voltage (top) (V)
1.28
Input Voltage (bottom) (V)
1.32
Output Voltage (top) (V)
VBAT Line Transient Response Step-Down Buck
(VBAT = 3.5V to 4.2V; IOUT = 300mA; VOUT = 1.24V; COUT = 4.7µF)
DATA SHEET
AAT3601
Total Power Solution for Portable Applications
Typical Characteristics – Step-Down Buck Converter (continued)
Load Transient Response
1.30
700
1.25
600
1.20
500
400
300
200
100
Load Current
(bottom) (mA)
Output Voltage (top) (V)
(100mA to 300mA; VBAT = 3.6V; VOUT = 1.24V; COUT = 4.7µF)
0
Time (100µs/div)
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13
DATA SHEET
AAT3601
Total Power Solution for Portable Applications
Typical Characteristics - LDO1
LDO1 Load Regulation vs. Output Current
Using CHGIN Input
LDO1 Load Regulation vs. Output Current
Using Battery Input
(VOUT1 = 3.4V)
(VOUT1 = 3.4V)
1.0
VCHGIN = 6V
VCHGIN = 5.5V
VCHGIN = 5V
VCHGIN = 4.5V
0.8
0.6
0.4
0.2
Load Regulation (%)
Load Regulation (%)
1.0
0.0
-0.2
-0.4
-0.6
0.6
0.4
0.2
0.0
-0.2
-0.4
-0.6
-0.8
-0.8
-1.0
VBAT = 4.2V
VBAT = 3.9V
VBAT = 3.6V
0.8
1
10
100
-1.0
1000
1
10
Output Current (mA)
LDO1 Output Voltage vs. Temperature
VOUT1 (V)
3.42
3.41
3.40
3.39
3.38
3.37
3.36
-50
(VOUT1 = 3.4V)
0.5
VIN = 6.0V
VIN = 5.5V
VIN = 5V
VIN = 4.5V
VBAT = 4.2V
VBAT = 3.6V
Line Regulation (%)
3.43
IOUT = 1mA
IOUT = 10mA
IOUT = 50mA
IOUT = 100mA
IOUT = 150mA
0.4
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
-0.4
-25
0
25
1000
LDO1 Line Regulation vs. CHGIN
and Battery Input Voltage
(IOUT1 = 10mA)
3.44
100
Output Current (mA)
50
75
-0.5
100
VBAT
3
3.5
Temperature (°C)
4
4.2
VCHGIN
4.5
5
5.5
6
Input VBAT, VCHGIN (V)
LDO1 Dropout Characteristics vs. Input Voltage
LDO1 Dropout Voltage vs. Output Current
(VOUT1 = 3.4V)
(VOUT1 = 3.4V)
120
3.45
3.40
3.35
IOUT = 1mA
IOUT = 10mA
IOUT = 50mA
IOUT = 100mA
IOUT = 150mA
3.30
3.25
3.20
3.4
3.5
3.6
3.7
3.8
3.9
Input Voltage (V)
14
4.0
4.1
4.2
Dropout Voltage (mV)
Output Voltage VOUT1 (V)
3.50
100
80
60
40
-40°C
25°C
85°C
20
0
0
25
50
75
100
Output Current (mA)
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125
150
DATA SHEET
AAT3601
Total Power Solution for Portable Applications
Typical Characteristics – LDO1 (continued)
Load Transient Response LDO1
(10mA to 75mA; VBAT = 3.6V; VOUT = 3.4V)
3.40
3.38
3.36
4.5
4.0
3.5
3.0
3.44
350
3.42
300
3.40
250
3.38
200
3.36
150
100
50
Load Current
(bottom) (mA)
Output Voltage (top) (V)
3.42
Input Voltage (bottom) (V)
3.44
Output Voltage (top) (V)
VBAT Line Transient Response LDO1
(VBAT = 3.7V to 4.2V; IOUT1 = 150mA; VOUT1 = 3.4V)
0
Time (200µs/div)
Time (100µs/div)
Load Transient Response LDO1
3.48
400
3.44
350
3.40
300
3.36
250
3.32
200
150
100
Load Current
(bottom) (mA)
Output Voltage (top) (V)
(75mA to 150mA; VBAT = 3.6V; VOUT = 3.4V)
50
0
Time (200µs/div)
Typical Characteristics – LDO2
LDO2 Dropout Characteristics vs. Input Voltage
LDO2 Dropout Voltage vs. Output Current
(VOUT2 = 3.4V)
(VOUT2 = 3.4V)
450
Dropout Voltage (mV)
Output Voltage VOUT2 (V)
3.50
3.45
3.40
3.35
IOUT = 1mA
IOUT = 10mA
IOUT = 50mA
IOUT = 100mA
IOUT = 200mA
IOUT = 300mA
3.30
3.25
3.20
3.4
3.5
3.6
3.7
3.8
3.9
Input Voltage (V)
4.0
4.1
4.2
400
350
300
250
200
150
-40°C
25°C
85°C
100
50
0
0
50
100
150
200
250
300
Output Current (mA)
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15
DATA SHEET
AAT3601
Total Power Solution for Portable Applications
Typical Characteristics – LDO4
LDO4 Load Regulation vs. Output Current
Using CHGIN Input
LDO4 Load Regulation vs. Output Current
Using Battery Input
(VOUT4 = 1.85V)
VCHGIN = 6V
VCHGIN = 5.5V
VCHGIN = 5V
VCHGIN = 4.5V
0.8
0.6
0.4
0.2
0.0
-0.2
-0.4
-0.6
-0.8
-1.0
1
10
100
(VOUT4 = 1.85V)
1.0
Load Regulation (%)
Load Regulation (%)
1.0
VBAT = 4.2V
VBAT = 3.9V
VBAT = 3.6V
0.8
0.6
0.4
0.2
0.0
-0.2
-0.4
-0.6
-0.8
-1.0
1
1000
10
Output Current (mA)
LDO4 Output Voltage vs. Temperature
1.88
VOUT4 (V)
1.87
1.86
1.85
1.84
1.83
1.82
1.81
1.80
-50
IOUT = 1mA
IOUT = 10mA
IOUT = 50mA
IOUT = 100mA
IOUT = 200mA
IOUT = 300mA
0.4
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
-0.4
-25
0
25
50
Temperature (°C)
16
(VOUT4 = 3.4V)
0.5
VIN = 6.0V
VIN = 5.5V
VIN = 5V
VIN = 4.5V
VBAT = 4.2V
VBAT = 3.6V
VBAT = 3V
Line Regulation (%)
1.89
1000
LDO4 Line Regulation vs. CHGIN
and Battery Input Voltage
(IOUT4 = 10mA)
1.90
100
Output Current (mA)
75
100
-0.5
3
VBAT
3.5
4
4.2
VCHGIN
4.5
5
Input VBAT, VCHGIN (V)
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5.5
6
DATA SHEET
AAT3601
Total Power Solution for Portable Applications
Typical Characteristics – General
Quiescent Current vs. Input Voltage
Start-up Sequence
Permanent-Enabled (PE) Supplies
(LDO1 + LDO3 + LDO5; No Load)
(VCHGIN = 5.0V)
500
400
300
200
85°C
25°C
-40°C
100
0
VBAT
2.7
3.2
3.7
VCHGIN
4.2
4.7
5.2
Output Voltage (2V/div)
Quiescent Current (µA)
600
Buck
LDO3
LDO5
LDO1
0
0
0
0
5.7
Input Voltage (V)
Time (1ms/div)
Start-up Sequence
Non-Permanent (NP) Supplies
Watchdog Timer
(WDI = 0V)
EN_NP
LDO2
LDO4
Buck
0
0
0
0
Output Voltage (1V/div)
Output Voltage (2V/div)
(VCHGIN = 5.0V)
0
0
RSTIN
WDI
Time (10ms/div)
LDO Power Supply Rejection Ratio, PSRR
LDO Output Voltage Noise
(IOUT3 = 10mA, BW = 100~100KHz)
(No Load; Power BW: 100~100KHz)
150
6.00
135
5.40
120
4.80
Noise (µVrms)
Magnitude (dB)
Time (500µs/div)
105
90
75
60
45
4.20
3.60
3.00
2.40
1.80
30
1.20
15
0.60
0
100
1000
10000
Frequency (Hz)
100000
0.00
100
1000
10000
100000
Frequency (Hz)
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DATA SHEET
AAT3601
Total Power Solution for Portable Applications
Typical Characteristics – General (continued)
LDO Output Voltage Noise
(IOUT3 = 10mA, Power BW = 100~100KHz)
6.00
5.40
Noise (µVrms)
4.80
4.20
3.60
3.00
2.40
1.80
1.20
0.60
0.00
100
1000
10000
100000
Frequency (Hz)
18
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DATA SHEET
AAT3601
Total Power Solution for Portable Applications
Functional Block Diagram
SYSOUT
SYSOUT
LDO
500mΩ
100mΩ
BAT
CHGIN
STAT
STAT_BAT
Charger
Control
ISET
TS
CT
ENBAT
USE_USB
Ref
SDA
SCL
PVIN
WDI
UVLO
I C and
Enable/Reset
Control
2
TEMP_FLAG
EN_SYS
RSTLPW
VIN
LX
Step-down
BUCK
Ref
OUTBUCK
Enable
RSTIN
PGND
EN_PE
VIN
REF
EN_NP
CNOISE
SGND
SGND
AVIN1
AVIN 2
VIN
LDO1
LDO2
Enable
Ref
VIN
Ref
LDO3
Enable
VIN
Ref
LDO4
Enable
VIN
Enable
Ref
VIN
LDO5
Enable
Ref
AGND
OUT5
OUT4
OUT3
OUT2
OUT1
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19
DATA SHEET
AAT3601
Total Power Solution for Portable Applications
Functional Description
The AAT3601 is a complete power management solution.
It seamlessly integrates an intelligent, stand-alone CC/
CV (Constant-Current/Constant-Voltage), linear-mode
single-cell battery charger with one step-down Buck converter and five low-dropout (LDO) regulators to provide
power from either a wall adapter or a single-cell LithiumIon/Polymer battery. Internal load switches allow the
LDO regulators and DC-DC converter to operate from the
best available power source of either an AC wall adapter,
USB port supply, or battery.
If only the battery is available, then the voltage regulators and converter are powered directly from the battery
through a 100mΩ load switch. (The charger is put into
sleep mode and draws less than 1μA quiescent current.)
If the system is connected to a wall adapter, then the
voltage converters are powered directly from the adapter through a 500mΩ load switch and the battery is disconnected from the voltage converter inputs. This allows
the system to operate regardless of the charging state of
the battery or with no battery. The LDOs and DC/DC
converter are separated into Permanently-Enabled (PE)
system-on supplies and Non-Permanent (NP) separate
enable supplies referring to the two independent enable
functions.
System Output (SYSOUT)
Intelligent control of the integrated load switches is
managed by the switch control circuitry to allow the
step-down converter and the LDOs to have the best
available power source. When the CHGIN pin voltage is
above 4.5V, the system automatically turns on and the
power to the SYSOUT pin will be provided by either the
CHGIN pin or the BAT pin. When the USE_USB pin is low,
the CHGIN provides power to SYSOUT through an internal LDO regulated to 3.9V. When the USE_USB pin is
high or if forced through use of an I2C command, the BAT
pin is shorted to SYSOUT through a 100m switch. If a
CHGIN voltage is not present and the system is enabled,
SYSOUT will be shorted to BAT.
This system allows the step-down converter and LDOs to
always have the best available source of power. This also
allows the voltage converters to operate with no battery,
or with a battery voltage that falls below the precondition trickle charge threshold.
Typical Power Up Sequence
The AAT3601 supports two enable/disable schemes.
System startup is initiated whenever one of the following
conditions occurs:
20
1. A push-button is used to assert EN_SYS low when a
valid supply (>CHGIN UVLO) is not connected to the
charger input CHGIN.
2. A valid adaptor supply (>CHGIN UVLO) is connected
to the charger input CHGIN.
Case 1
The startup sequence for the AAT3601 is typically initiated
by pulling the EN_SYS pin low with a pushbutton switch
(see Figure 1). The SYSOUT is the first block to be turned
on. When the output of the SYSOUT reaches 90% of its
final value, then the PE supplies LDO1, LDO3 and LDO5
are enabled if EN_PE is low. When the PE supplies reach
90% of their final value, the 800ms RSTLPW timer is initiated holding the microprocessor in reset. When the
RSTLPW pin goes High, the NP sequence supplies LDO2,
LDO4 and OUTBUCK can be enabled and disabled as
desired using the EN_NP pin. When the NP supplies reach
90% of their final value, the 10ms RSTIN timer is released.
The NP outputs should not be started up until after the
RSTLPW pin goes high. Do not start all the outputs up at
the same time. The state of EN_SYS is latched as long as
either CHGIN or BAT is connected to the device.
Case 2
Alternatively, the startup sequence is automatically
started without the pushbutton switch when the CHGIN
pin rises above its UVLO threshold. The battery charger
is started when CHGIN_OK is internally enabled. The
STAT pin goes high and the system is enabled.
Sequence of startup depends on whether or not the
adapter input is connected or open. The timing diagrams
in Figures 2 and 3 illustrate the two cases. A typical
startup and shutdown process proceeds as follows
(referring to Figures 1, 2 and 3).
Typical Power Down Sequence
If only the battery is connected and the voltage level is
above the BAT UVLO, then the EN_PE pin can be held low
in order to power down AAT3601. When the voltage at
the CHGIN pin is above the CHGIN UVLO, the device cannot be powered down but the EN_PE and EN_NP pins can
be used to disable the PE and NP supplies. If the adapter
supply at the CHGIN pin is disconnected, the device will
power down even if BAT is connected if the EN_SYS state
was not first latched into the device by pulling it low
when either BAT or CHGIN is connected. If CHGIN falls
below UVLO without being disconnected, the EN_SYS will
still be latched and the device will remain powered. The
outputs of the LDOs are internally pulled to ground with
10k during shutdown to discharge the output capacitors
and ensure a fast turn-off response time.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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DATA SHEET
AAT3601
Total Power Solution for Portable Applications
To SYSOUT
STAT_BAT
ENBAT
Charger
1k
CHGIN
CHGIN
UVLO
EN_SYS
Push-button
On switch
1
D
SET
STAT
SYSOUT
MUX
Q
BAT
100 μs
debounce
R
SYSOUT
Q
SYSOUT
UVLO
EN_PE
To SYSOUT
POK1
LDO1
100k
POK3
LDO3
RSTLPW
800ms typ
delay
POK5
LDO5
To SYSOUT
POKBUCK
DC/DC Buck
EN_NP
100k
POK2
10ms typ
delay
LDO2
RSTIN
POK4
LDO4
60ms Watchdog
WDI
Figure 1: Enable, Watchdog and Reset Functions Detailed Schematic.
100μs
debounce
EN_SYS pin
SYSTEM ENABLE
(Internal)
SYSOUT
SYSOUT_OK
(Internal)
Battery voltage
0V
Enabling the System
3.4V
3.4V
LDO1
1.24V
1.24V
1.85V
1.85V
LDO3
LDO5
RSTLPW pin
800ms
reset
time
Shutdown
system
EN_PE
EN_NP
Enabling NP
Shutdown NP
3.4V
LDO2
1.24V
DC/DC
1.85V
LDO4
RSTIN pin
10ms
reset
time
Figure 2a: Power Up/Down Sequence; Case 1, Adapter is Not Connected.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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21
DATA SHEET
AAT3601
Total Power Solution for Portable Applications
EN_SYS pin
CHGIN
CHGIN_OK
(Internal)
Charger current
800mA
0mA
0mA
ENBAT pin
STAT pin
LED current
0mA
0mA
SYSTEM ENABLE
(Internal)
SYSOUT
Battery voltage
0V
Enabling the System
SYSOUT_OK
(Internal)
3.4V
3.4V
LDO1
1.24V
1.24V
1.85V
1.85V
LDO3
LDO5
RSTLPW pin
800ms
reset
time
Shutdown
system
EN_PE pin
EN_NP pin
Enabling NP
Shutdown NP
3.4V
LDO2
1.24V
DC/DC
LDO4
1.85V
10ms
reset
time
RSTIN pin
Figure 2b: Power Up/Down Sequence; Case 2, Connecting the Adapter Automatically Starts the System.
Watchdog Timer Input (WDI)
The AAT3601 includes an internal watchdog timer that
can be controlled by a μP. After RSTIN goes high, the
watchdog timer must get clock edges on the WDI pin
from the processor. The WDI clock edges must be < 60ms
apart to reset the internal watchdog timer or the RSTIN
pin will become active low.
Battery Charger
Figure 4 illustrates the entire battery charging profile
which consists of three phases.
1.
2.
3.
Preconditioning-Current Mode (Trickle) Charge
Constant-Current Mode Charge
Constant-Voltage Mode Charge
Preconditioning Trickle Charge
Battery charging commences only after the AAT3601 battery charger checks several conditions in order to maintain a safe charging environment. The System Operation
22
Flow Chart for the Battery Charger operation is shown in
Figure 5. The input supply must be above the minimum
operating voltage (UVLO) and the enable pin (ENBAT)
must be low (it is internally pulled down). When the battery is connected to the BAT pin, the battery charger
checks the condition of the battery and determines which
charging mode to apply.
Preconditioning-Current
Mode Charge Current
If the battery voltage is below the Preconditioning
Voltage Threshold VMIN, then the battery charger initiates
precondition trickle charge mode and charges the battery
at 12% of the programmed constant-current magnitude.
For example, if the programmed current is 500mA, then
the trickle charge current will be 60mA. Trickle charge is
a safety precaution for a deeply discharged cell. It also
reduces the power dissipation in the internal series pass
MOSFET when the input-output voltage differential is at
its highest.
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DATA SHEET
AAT3601
Total Power Solution for Portable Applications
T < tWDI
T < tWDI
T < tWDI
T < tWDI
T < tWDI
T < tWDI
WDI
tRSTIN
tRSTIN
tWDI
RSTIN
POK of
non-permanent
supplies
tWDI = Watchdog timer timeout (60ms)
tRSTIN = RSTIN pin reset time (10ms)
Figure 3: Watchdog Timer Timing Diagram.
I (mA)
V (V)
Preconditioning
Trickle Charge
Phase
Constant Current
Charge Phase
Constant Voltage
Charge Phase
FAST-CHARGE to
TOP-OFF Charge
Threshold
Constant-Current Mode
Charge Current (ICH_CC)
Battery End of Charge
Voltage Regulation (VBAT_REG)
Charge Voltage
Preconditioning Threshold
Voltage (VMiN)
Charge Current
Preconditioning Charge
Current (ICH_PRE)
Charge Termination
Threshold Current
(ICH_TERM)
T (s)
Trickle Charge
Timeout
(TK)
Constant Current Timeout
(TC)
Constant Voltage Timeout
(TV)
Figure 4: Current vs. Voltage and Charger Time Profile.
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DATA SHEET
AAT3601
Total Power Solution for Portable Applications
Enable
No
Power On Reset
Yes
Power Input
Voltage
VCHGIN > VUVLO
Enable
Expired
Yes
Shut Down
Yes
Charge Timer
Control
Fault
Conditions Monitoring
OV, OT,
VTS1 < VTS < V TS2
No
Preconditioning
Test
VBAT < VMIN
Yes
Preconditioning
(Trickle Charge)
Thermal
Loop
Thermal
Loop
Current
Current
ReductionininADP
Reduction
C.C. ModeMode
Charging
Yes
No
No
No
Recharge Test
VBAT < VRCH
Yes
Current Phase Test
VBAT < VBAT_REG
Yes
Constant
Current Charge
Mode
Yes
Constant
Voltage Charge
Mode
Device Thermal
Loop Monitor
TJ > 115°C
No
Voltage Phase Test
ICH > ICH_TERM
No
Charge Completed
Figure 5: System Operation Flow Chart for the Battery Charger.
24
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DATA SHEET
AAT3601
Total Power Solution for Portable Applications
Constant-Current Mode Charge Current
Temperature Sense (TS)
Trickle charge continues until the battery voltage reaches VMIN. At this point the battery charger begins constant-current charging. The current level default for this
mode is programmed using a resistor from the ISET pin
to ground. Once that resistor has been selected for the
default charge current, then the current can be adjusted
through I2C from a range of 40% to 180% of the programmed default charge current. Programmed current
can be set at a minimum of 100mA and up to a maximum of 1.44A. When the CHGIN_OK signal goes low, the
default I2C setting of 100% is reset. If the USE_USB
signal is high when this happens, the charge current is
reset to an internally set 100mA current until the microcontroller sends another I2C signal to change the charge
current. (see I2C Programming section).
The TS pin is available to monitor the battery temperature. Connect a 10k NTC resistor from the TS pin to
ground. The TS pin outputs a 75μA constant current into
the resistor and monitors the voltage to ensure that the
battery temperature does not fall outside the limits
depending on the Temperature coefficient of the resistor
used. When the voltage goes above 2.39V or goes below
331mV, the charging current will be suspended.
Constant-Voltage Mode Charge
Constant current charging will continue until the battery
voltage reaches the Output Charge Voltage Regulation
point VBAT_REG. When the battery voltage reaches the regulation voltage (VBAT_REG), the battery charger will transition
to constant-voltage mode. VBAT_REG is factory programmed
to 4.2V (nominal). Charging in constant-voltage mode will
continue until the charge current has reduced to the end
of charge termination current programmed using the I2C
interface (5%, 10%, 15%, or 20%).
Power Saving Mode
After the charge cycle is complete, the battery charger
turns off the series pass device and automatically goes
into a power saving sleep mode. During this time, the
series pass device will block current in both directions to
prevent the battery from discharging through the battery
charger.
The battery charger will remain in sleep mode even if the
charger source is disconnected. It will come out of sleep
mode if either the battery terminal voltage drops below
the VRCH threshold, the charger ENBAT pin is recycled, or
the charging source is reconnected. In all cases, the battery charger will monitor all parameters and resume
charging in the most appropriate mode.
Charge Safety Timer (CT)
While monitoring the charge cycle, the AAT3601 utilizes
a charge safety timer to help identify damaged cells and
to ensure that the cell is charged safely. Operation is as
follows: upon initiating a charging cycle, the AAT3601
charges the cell at 10% of the programmed maximum
charge until VBAT > 2.8V. If the cell voltage fails to the
precondition threshold of 2.8V (typ) before the safety
timer expires, the cell is assumed to be damaged and
the charge cycle terminates. If the cell voltage exceeds
2.8V prior to the expiration of the timer, the charge cycle
proceeds into fast charge. Three timeout periods of 1
hour for Trickle Charge mode, 3 hours for Constant
Current Mode and 3 hours for Constant Voltage mode.
Mode
Time
Trickle Charge (TK) Time Out
Trickle Charge (TK) + Constant Current (TC)
Mode Time Out
Constant Voltage (TV) Mode Time Out
25 minutes
3 hours
3 hours
Table 1: Charge Safety Timer (CT) Timeout Period
for a 0.1μF Ceramic Timing Capacitor.
The CT pin is driven by a constant current source and will
provide a linear response to increases in the timing
capacitor value. Thus, if the timing capacitor were to be
doubled from the nominal 0.1μF value, the time-out
periods would be doubled. If the programmable watchdog timer function is not needed, it can be disabled by
terminating the CT pin to ground or disabled using the
I2C bus. The CT pin should not be left floating or unterminated, as this will cause errors in the internal timing
control circuit. The constant current provided to charge
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DATA SHEET
AAT3601
Total Power Solution for Portable Applications
1400
1200
ICH_CC (mA)
the timing capacitor is very small, and this pin is susceptible to noise and changes in capacitance value. Therefore,
the timing capacitor should be physically located on the
printed circuit board layout as close as possible to the CT
pin. Since the accuracy of the internal timer is dominated by the capacitance value, a 10% tolerance or better ceramic capacitor is recommended. Ceramic capacitor materials, such as X7R and X5R types, are a good
choice for this application.
1000
800
600
400
200
0
0.1
1
Programming Charge Current (ISET)
100
Figure 6: Constant-Current Mode Charge
ICH_CC Setting vs. ISET Resistor.
Ω
1.4
1.2
1
VISET (V)
The default constant current mode charge level is user
programmed with a set resistor placed between the ISET
pin and ground. The accuracy of the constant charge
current, as well as the preconditioning trickle charge
current, is dominated by the tolerance of the set resistor.
For this reason, a 1% tolerance metal film resistor is
recommended for the set resistor function. The constant
charge current levels from 100mA to 1A may be set by
selecting the appropriate resistor value from Table 2 and
Figures 6 and 7. The ISET pin current to charging current ratio is 1 to 800. It is regulated to 1.25V during
constant current mode unless changed using I2C commands. It can be used as a charging current monitor,
based on the equation:
10
ISET Resistor (kΩ
Ω)
0.8
0.6
0.4
0.2
0
2.5
2.9
3.3
3.7
4.1
4.5
Battery Voltage (V)
ICH = 800 ⋅
⎛ VISET⎞
⎝ RISET⎠
Figure 7: ISET Voltage vs. Battery Voltage.
During preconditioning charge, the ISET pin is regulated
to 0.2V (Figure 6), but the equation stays the same.
During constant voltage charge mode, the ISET pin voltage will slew down and be directly proportional to the
battery current at all times.
Constant Charging
Current ICH_CC (mA)
Set Resistor
Value (k)
100
200
300
400
500
600
700
800
900
1000
10
4.99
3.32
2.49
2
1.65
1.43
1.24
1.1
1
Table 2: Constant Current Charge
vs. ISET Resistor Value.
26
Reverse Battery Leakage
The AAT3601 includes internal circuitry that eliminates
the need for series blocking diodes, reducing solution
size and cost as well as dropout voltage relative to conventional battery chargers. When the input supply is
removed or when CHGIN goes below the AAT3601’s
under-voltage lockout (UVLO) voltage, or when CHGIN
drops below VBAT, the AAT3601 automatically reconfigures its power switches to minimize current drain from
the battery.
Charge Status Output
(STAT and STAT_BAT)
The AAT3601 provides battery charging status via a status pin. The STAT is active low open drain for driving and
LED. STAT_BAT is the same function as STAT pin but
with opposite polarity to be used as a μP flag. The status
pin can indicate the following conditions:
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AAT3601
Total Power Solution for Portable Applications
Event Description
STAT
No battery charging activity.
Battery charging
Charging completed
Low (to GND)
High (to VOUT1)
Low (to GND)
Table 3: Charge Status Output (STAT).
CHGIN Bypass Capacitor Selection
CHGIN is the power input for the AAT3601 battery charger. The battery charger is automatically enabled whenever a valid voltage is present on CHGIN. In most applications, CHGIN is connected to either a wall adapter or
USB port. Under normal operation, the input of the charger will often be “hot-plugged” directly to a powered USB
or wall adapter cable, and supply voltage ringing and
overshoot may appear at the CHGIN pin. A high quality
capacitor connected from CHGIN to G, placed as close as
possible to the IC, is sufficient to absorb the energy. Walladapter powered applications provide flexibility in input
capacitor selection, but the USB specification presents
limitations to input capacitance selection. In order to
meet both the USB 2.0 and USB OTG (On The Go) specifications while avoiding USB supply under-voltage conditions resulting from the current limit slew rate (100mA/
μs) limitations of the USB bus, the CHGIN bypass capacitance value must to be between 1μF and 4.7μF. Ceramic
capacitors are often preferred for bypassing applications
due to their small size and good surge current ratings,
but care must be taken in applications that can encounter
hot plug conditions as their very low ESR, in combination
with the inductance of the cable, can create a high-Q
filter that induces excessive ringing at the CHGIN pin.
This ringing can couple to the output and be mistaken as
loop instability, or the ringing may be large enough to
damage the input itself. Although the CHGIN pin is
designed for maximum robustness and an absolute maximum voltage rating of +6.5V for transients, attention
must be given to bypass techniques to ensure safe operation. As a result, design of the CHGIN bypass must take
care to “de-Q” the filter. This can be accomplished by
connecting a 1 resistor in series with a ceramic capacitor (as shown in Figure 8A), or by bypassing with a tantalum or electrolytic capacitor to utilize its higher ESR to
dampen the ringing, as shown in Figure 8B. For additional protection, Zener diodes with 6V clamp voltages
may also be used. In any case, it is always critical to
evaluate voltage transients at the CHGIN pin with an
oscilloscope to ensure safe operation.
Thermal Considerations
The actual maximum charging current is a function of
Charge Adapter input voltage, the state of charge of the
battery at the moment of charge, the system supply current from SYSOUT, and the ambient temperature and the
thermal impedance of the package. The maximum programmable current may not be achievable under all operating parameters. Issues to consider are the amount of
current being sourced to the SYSOUT pin from the CHGIN
LDO at the same time as the charge current to BAT.
CHGIN
To USB Port or
Wall Adapter
To USB Port or
Wall Adapter
1Ω
CHGIN
4.7μF
ESR > 1Ω
1μF Ceramic
(XR5/XR7)
(A)
(B)
Figure 8: Hot Plug Requirements.
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DATA SHEET
AAT3601
Total Power Solution for Portable Applications
The AAT3601 is offered in a TQFN55-36 package which
can provide up to 4W of power dissipation when it is
properly bonded to a printed circuit board and has a
maximum thermal resistance of 25°C/W. Many considerations should be taken into account when designing the
printed circuit board layout, as well as the placement of
the charger IC package in proximity to other heat generating devices in a given application design. The ambient temperature around the charger IC will also have an
effect on the thermal limits of a battery charging application. The maximum limits that can be expected for a
given ambient condition can be estimated by the following discussion. First, the maximum power dissipation for
a given situation should be calculated:
Next, the power dissipation for the charger can be calculated by the following equation:
PD = (VCHGIN - VBAT) · ICH_CC + (VCHGIN · IOP) + (VCHGIN - VSYSOUT) · ISYSOUT
+ (VSYSOUT - VOUT1) · IOUT1 + (VSYSOUT - VOUT2) · IOUT2
+ (VSYSOUT - VOUT3) · IOUT3 + (VSYSOUT - VOUT4) · IOUT4
+ (VSYSOUT - VOUT5) · IOUT5
⎧
⎩
Where:
PD = Total Power Dissipation by the Device
VCHGIN = CHGIN Input Voltage
VBAT = Battery Voltage at the BAT Pin
ICH_CC = Constant Charge Current Programmed for the
Application
IOP = Quiescent Current Consumed by the IC for Normal
Operation (0.5mA)
VSYSOUT and ISYSOUT = Output Voltage and Load Current
from the SYSOUT Pin for the System LDOs and Stepdown Converter (3.9V out for SYSOUT)
RDS(ON)H and RDS(ON)L = On-Resistance of Step-down High
and Low Side MOSFETs (0.8 each)
28
- [(VSYSOUT - VOUT1) · IOUT1] - (VSYSOUT - VOUT2) · IOUT2
- IOUTBUCK2 · ⎧RDS(ON)L ·
⎩
VOUTBUCK RDS(ON)H · (VSYSOUT - VOUTBUCK)
+
VSYSOUT
VSYSOUT
⎧
⎩
PD(MAX) = Maximum Power Dissipation (4W)
θJA = Package Thermal Resistance (25°C/W)
TJ(MAX) = Maximum Device Junction Temperature (°C)
(140°C)
TA = Ambient Temperature (°C)
VOUTBUCK RDS(ON)H · [VSYSOUT - VOUTBUCK]
+
VSYSOUT
VSYSOUT
ICH_CC(MAX) =
(TREG - TA) - (V
CHGIN · IOP) - (VCHGIN - VSYSOUT) · ISYSOUT)
θJA
- (VSYSOUT - VOUT5) · IOUT5
Where:
⎩
By substitution, we can derive the maximum charge current (ICH_CC(MAX)) before reaching the thermal limit condition (TREG = 100°C, Thermal Loop Regulation). The maximum charge current is the key factor when designing
battery charger applications.
- [(VSYSOUT - VOUT3) · IOUT3] - (VSYSOUT - VOUT4) · IOUT4
(TJ(MAX) - TA)
PD(MAX) =
θJA
+ IOUTBUCK2 · ⎧RDS(ON)L ·
VOUTX and IOUTX = Output Voltage and Load Currents for
the LDOs and Step-Down Converter (Default Output
Voltages)
VIN - VBAT
In general, the worst condition is when there is the
greatest voltage drop across the charger, when battery
voltage is charged up to just past the preconditioning
voltage threshold and the LDOs and step-down converter are sourcing full output current.
For example, if 700mA and 147mA are being sourced
from the 3.9V SYSOUT pin to the LDOs and Buck supply
channels respectively (300mA to LDO2, 100mA to LDO1
and 3-5, and 147mA to Buck; see buck efficiency graph
for 300mA output current) with a CHGIN supply of 5V,
and the battery is being charged at 3.0V, then the power
dissipated will be 3.49W. A reduction in the charge current (through I2C) may be necessary in addition to
reduction provided by the internal thermal loop of the
charger itself.
For the above example at TA = 30°C, the ICH_CC(MAX) =
459mA.
Thermal Overload Protection
The AAT3601 integrates thermal overload protection
circuitry to prevent damage resulting from excessive
thermal stress that may be encountered under fault conditions, for example. This circuitry disables all regulators
if the AAT3601 die temperature exceeds 140°C, and
prevents the regulators from being enable until the die
temperature drops by 15°C (typ).
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DATA SHEET
AAT3601
Total Power Solution for Portable Applications
Synchronous Step-Down
(Buck) Converter
The AAT3601 contains a high performance 300mA,
1.5MHz synchronous step-down converter. The stepdown converter operates to ensure high efficiency performance over all load conditions. It requires only 3
external power components (CIN, COUT, and L). A high DC
gain error amplifier with internal compensation controls
the output. It provides excellent transient response and
load/line regulation. Transient response time is typically
less than 20μs. The converter has soft start control to
limit inrush current and transitions to 100% duty cycle
at drop out.
The step-down converter input pin PVIN should be connected to the SYSOUT LDO output pin. The output voltage is internally fixed at 1.24V. Power devices are sized
for 300mA current capability while maintaining over
90% efficiency at full load.
Input/Output Capacitor and Inductor
Apart from the input capacitor that is shared with the LDO
inputs, only a small L-C filter is required at the output side
for the step-down converter to operate properly. Typically,
a 2.2μH inductor such as the Sumida CDRH2D11NP2R2NC and a 4.7μF ceramic output capacitor are recommended for low output voltage ripple and small component size. Ceramic capacitors with X5R or X7R dielectrics
are highly recommended because of their low ESR and
small temperature coefficients. A 10μF ceramic input
capacitor is sufficient for most applications.
Control Loop
The converter is a peak current mode step-down converter. The inner, wide bandwidth loop controls the
inductor peak current. The inductor current is sensed
through the P-channel MOSFET (high side) which is also
used for short circuit and overload protection. A fixed
slope compensation signal is added to the sensed current to maintain stability for duty cycles greater than
50%. The peak current mode loop appears as a voltage
programmed current source in parallel with the output
capacitor.
The output of the voltage error amplifier programs the
current mode loop for the necessary peak inductor current to force a constant output voltage for all load and
line conditions. The voltage feedback resistive divider is
internal and the error amplifier reference voltage is
0.45V. The voltage loop has a high DC gain making for
excellent DC load and line regulation. The internal voltage loop compensation is located at the output of the
transconductance voltage error amplifier.
Soft-Start
Soft start slowly increases the internal reference voltage
when the input voltage or enable input is initially applied.
It limits the current surge seen at the input and eliminates output voltage overshoot.
Current Limit and
Over-Temperature Protection
For overload conditions the peak input current is limited.
As load impedance decreases and the output voltage
falls closer to zero, more power is dissipated internally,
raising the device temperature. Thermal protection completely disables switching when internal dissipation
becomes excessive, protecting the device from damage.
The junction over-temperature threshold is 140°C with
15°C of hysteresis.
Linear LDO Regulators (OUT1-5)
The advanced circuit design of the linear regulators has
been specifically optimized for very fast start-up and
shutdown timing. These proprietary LDOs are tailored for
superior transient response characteristics. These traits
are particularly important for applications which require
fast power supply timing.
There are two LDO input pins AVIN1/2 which should be
connected to the SYSOUT LDO output pin. All LDO outputs are initially fixed at default levels. The user can
program the output voltages for all the LDOs using I2C
(see Table 8).
The high-speed turn-on capability is enabled through the
implementation of a fast start control circuit, which
accelerates the power up behavior of fundamental control and feedback circuits within the LDO regulator. Fast
turn-off time response is achieved by an active output
pull down circuit, which is enabled when an LDO regulator is placed in the shutdown mode. This active fast
shutdown circuit has no adverse effect on normal device
operation.
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DATA SHEET
AAT3601
Total Power Solution for Portable Applications
Input/Output Capacitors
The LDO regulator output has been specifically optimized
to function with low cost, low ESR ceramic capacitors.
However, the design will allow for operation over a wide
range of capacitor types. The input capacitor is shared
with all LDO inputs and the step-down converter. A 10μF
ceramic output capacitor is recommended for LDO2-5
and a 22μF is recommended for LDO1.
Current Limit and
Over-Temperature Protection
The regulator comes with complete short circuit and thermal protection. The combination of these two internal
protection circuits gives a comprehensive safety system
to guard against extreme adverse operating conditions.
I2C Serial Interface
and Programmability
Serial Interface
Many of the features of the AAT3601 can be controlled via
the I2C serial interface. The I2C serial interface is a widely used interface where it requires a master to initiate all
the communications with the slave devices. The I2C protocol consists of 2 active wire SDA (serial data line) and
SCL (serial clock line). Both wires are open drain and
require an external pull up resistor to VCC (SYSOUT may
be used as VCC). The SDA pin serves I/O function, and the
SCL pin controls and references the I2C bus. I2C protocol
is a bidirectional bus which allows both read and write
actions to take place, but the AAT3601 supports the write
protocol only. Since the protocol has a dedicated bit for
Read or Write access (R/W), when communicating with
AAT3601, this bit must be set to “0”.
The timing diagram below depicts the transmission
protocol.
ACK from slave
START
MSB
Chip
Address
LSB
W
ACK
MSB
ACK from slave
Register
Address
LSB
ACK
MSB
ACK from slave
Data
LSB
ACK STOP
SCL
SDA
1
0
0
1
1
0
0
0
including R/W bit,
Chip Address = 0x98
Figure 9: I2C Timing Diagram.
30
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DATA SHEET
AAT3601
Total Power Solution for Portable Applications
START and STOP Conditions
START and STOP conditions are always generated by the
master. Prior to initiating a START condition, both the
SDA and SCL pin are idle mode (idle mode is when there
is no activity on the bus and SDA and SCL are pulled to
VCC via external resistor). As depicted in Figure 9, a
START condition is defined to be when the master pulls
the SDA line low and after a short period pulls the SCL
line low. A START condition acts as a signal to the ICs
that something is about to be transmitted on the BUS.
A STOP condition, also shown in Figure 9, is when the
master releases the bus and SCL changes from low to
high followed by SDA low to high transition. The master
does not issue an ACKNOWLEGE and releases the SCL
and SDA pins.
Transferring Data
Every byte on the bus must be 8 bits long. A byte is always
sent with a most significant bit first (see Figure 10).
R/W
LSB
MSB
Figure 10: Bit Order.
The address is embedded in the first seven bits of the
byte. The eighth bit is reserved for the direction of the
information flow for the next byte of information. For the
AAT3601, this bit must be set to “0”. The full 8-bit
address including the R/W bit is 0x98 (hex) or 10011000
in binary.
Acknowledge Bit
Acknowledge bit is the ninth bit of data. It is used to
send back a confirmation to the master that the data has
been received properly. For acknowledge to take place,
the MASTER must first release the SDA line, then the
SLAVE will pull the data line low as shown in Figure 9.
Serial Programming Code
After sending the chip address, the master should send
an 8-bit data stream to select which register to program
and then the codes that the user wishes to enter.
Register 0x00:
Timer
RCHG1
RCHG0
CHG2
CHG1
CHG0
Term1
Term0
Not used
Not used
Not used
Not used
SYS
LDO11
LDO10
LDO50
LDO41
LDO40
LDO31
LDO30
LDO21
LDO20
Register 0x01:
Not used
Register 0x02:
LDO51
Figure 11: Serial Programming Register Codes.
USE_USB Pin
CHG2
CHG1
CHG0
Constant Current Charge ICH_CC
Constant Current Charge as
% of ISET current
1
0
X
X
X
X
X
X
X
0
0
0
0
0
1
1
1
1
0
0
0
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
100mA (fixed internally)
800mA (set by ISET resistor)
640mA
480mA
320mA
960mA
1120mA
1280mA
1440mA
(default)
100% (default)
80%
60%
40%
120%
140%
160%
180%
Table 4: CHG Bit Setting for the Constant Current Charge Level
(ISET resistor = default 800mA charge current).
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31
DATA SHEET
AAT3601
Total Power Solution for Portable Applications
Notes concerning the operation of the CHG2, CHG1 and
CHG0 bits or ISET code.
RCHG1
RCHG0
Recharge Threshold
• Once the part is turned on using the EN_SYS pin (and
there is a BAT and/or CHGIN supply), and data is sent
through I2C, the I2C codes in the registers will always be
preserved until the part is shut down using the EN_PE
(going high) or if the BAT and CHGIN are removed.
• If the part is turned on by connecting CHGIN (and not
through EN_SYS), then when the CHGIN is disconnected, the part will shut down and all I2C registers
will be cleared.
0
0
1
1
0
1
0
1
4.00V (default)
4.05V
4.10V
4.15V
Table 6: RCHG Bit Setting for
the Battery Charger Recharge Voltage Level.
If USE_USB = L,
• The charge current is set by the ISET code in Register
0x00, bits 2,3,4. (code 000 will equal 100%)
• If the part has been turned on by EN_SYS and CHGIN
is disconnected then reconnected, it will still contain
the code it had before (if it was 60% then it will
remain 60%).
• If the part has NOT been turned on by EN_SYS and
CHGIN is disconnected then reconnected, it will be
reset to 100% (since the whole part was shutdown).
If USE_USB = H,
• ISET Code 000 in Register 0x00, bits 2,3,4 = 100mA.
The other codes stay the same as if USE_USB = H.
• If the part has been turned on by EN_SYS and CHGIN
is disconnected then reconnected, the ISET code will be
forced to 000 and the current will be set to 100mA.
• The next time any I2C register is programmed (even if
it is not for the ISET code), the ISET code will revert
back to what it was before. For example, if the ISET
code is set to 010 and USE_USB = H and the part was
turned on with EN_SYS, then when CHGIN is disconnected then reconnected, the charger will be set to
100mA. Then if any other command is sent, the ISET
code will remain 010.
Term1
Term0
Termination Current (as % of
Constant Current Charge)
0
0
1
1
0
1
0
1
5% (default)
10%
15%
20%
Table 5: Term Bit Setting for
the Termination Current Level.
Timer
Charger Watchdog Timer
0
1
ON (default)
OFF (and reset to zero)
Table 7: Timer Bit Setting for
the Charger Watchdog Timer.
LDO11
LDO10
LDO1 Output Voltage
0
0
1
1
0
1
0
1
3.40V (default)
2.88V
3.50V
3.09V
LDO21
LDO20
LDO2 Output Voltage
0
0
1
1
0
1
0
1
3.40V (default)
2.78V
3.09V
1.85V
LDO31
LDO30
LDO3 Output Voltage
0
0
1
1
0
1
0
1
1.24V (default)
1.29V
1.34V
2.88V
LDO41
LDO40
LDO4 Output Voltage
0
0
1
1
0
1
0
1
1.85V (default)
1.65V
1.24V
1.91V
LDO51
LDO50
LDO5 Output Voltage
0
0
1
1
0
1
0
1
1.85V (default)
1.75V
1.55V
1.91V
Table 8: LDO Bit Setting for
LDO Output Voltage Level.
SYS Bit
0
1
SYSOUT Power Source
If USE_USB=H, SYSOUT powered from BAT
If USE_USB=L, SYSOUT powered from CHGIN
SYSOUT always powered from BAT
Table 9: SYS Bit Setting for SYSOUT Power Path.
32
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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DATA SHEET
AAT3601
Total Power Solution for Portable Applications
Layout Guidance
Figure 12 is the schematic for the evaluation board. The
evaluation board has extra components for easy evaluation; the actual BOM need for the system is shown in
Table 10. When laying out the PC board, the following
layout guideline should be followed to ensure proper
operation of the AAT3601:
1.
2.
The exposed pad EP must be reliably soldered to
PGND/AGND and multilayer GND. The exposed thermal pad should be connected to board ground plane
and pins 17 and 31. The ground plane should include
a large exposed copper pad under the package with
VIAs to all board layers for thermal dissipation.
The power traces, including GND traces, the LX
traces and the VIN trace should be kept short, direct
and wide to allow large current flow. The L1 connection to the LX pins should be as short as possible.
Use several via pads when routing between layers.
3.
4.
5.
6.
7.
The input capacitors (C1 and C2) should be connected as close as possible to CHGIN (Pin 28) and
PGND (Pin 31) to get good power filtering.
Keep the switching node LX away from the sensitive
OUTBUCK feedback node.
The feedback trace for the OUTBUCK pin should be
separate from any power trace and connected as
closely as possible to the load point. Sensing along a
high current load trace will degrade DC load regulation.
The output capacitor C4 and L1 should be connected
as close as possible and there should not be any
signal lines under the inductor.
The resistance of the trace from the load return to
the PGND (Pin 31) should be kept to a minimum.
This will help to minimize any error in DC regulation
due to differences in the potential of the internal
signal ground and the power ground.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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33
DATA SHEET
AAT3601
Total Power Solution for Portable Applications
Quantity
Value
Designator
Footprint
Description
5
2
4
3
1
1
10μF
22μF
4.7μF
0.1μF
0.01μF
2.2μH
0603
0805
0603
0402
0402
CDRH2D
Capacitor - Ceramic - X5R, 6.3V, ±20%
Capacitor - Ceramic - 20%, 6.3V, X5R
Capacitor - Ceramic - 20%, 6.3V, X5R
Capacitor - Ceramic -16V, 10%, X5R
Capacitor - Ceramic -16V, 10%, X7R
Inductor - Sumida CDRH2D11NP-2R2NC
9
100K
0402
Resistor - 5%
8
10K
0402
Resistor - 5%
1
1.24K
C1, C2, C3, C14, C15
C9
C4, C5, C6, C7, C8
C10, C11, C12
C13
L1
R5, R8, R20, R21, R22,
R23, R25, R26, R27
R17, R19, R24, R29,
R31, R32, R33, R37
R18
0402
Resistor - 1%
Table 10: Minimum AAT3601 BOM.
J1
2
1
AUX Input
SDA SCL
TP1 TP2
J2
R1
OUT1
J3
USB Mini
SDA
SCL
GND
10K
R2
5 4 3 2 1
1
2
3
4
10K
Data Header
TP3
AGND
C1
CHGIN
TP4
10μF
ENBAT
TP6
USE_USB
TP7
CHGIN
28
ENBAT
30
USE_USB
TP16
WDI
SW1
29
TEMP_FLAG
TP14
EN_SYS
TP15
BAT
TP5
U1
35
36
CHGIN
BAT
BAT
ENBAT
USE_USB
SDA
SCL
SYSOUT
SYSOUT
AVIN1
AVIN2
PVIN
27
BAT
26
OUTBUCK
TP8
25
11
OUT4
TP10
OUT3
TP11
OUT1
TP13
C2
10μF
C3
10μF
22
R3
3
100K
EN_SYS
CHGIN
R4
2
100K
1
5
OUT1
SW2
TP17
OUT1
6
J6
7
8
EN_PE
EN_PE
32
CHGIN
USE_USB
J4
USE_USB
EN_SYS
TEMP_FLAG
WDI
EN_PE
EN_NP
GND
GND
OUT1
OUT2
OUT3
OUT4
OUT5
LX
OUTBUCK
15
13
12
10
9
CHGIN
ENBAT
J5
31
CT
ISET
RSTIN
STATBAT
RSTLPW
STAT
C10
0.1μF
R7
1.24K
AGND
PGND
GND_SLUG
R8
10K
OUTBUCK
L1 2.2μF
23
19
TP18
RSTIN
C4
4.7μF
OUT1
C5
10μF
C6
10μF
R5
4
100K
TP19
RSTLPW
18
34
R6
100K
TS
CNOISE
ENBAT
OUT1
OUT2
OUT3
OUT4
OUT5
20
EN_PE
33
17
TP20
16
STAT
TP21
STAT_BAT
21
37
C11
0.01μF
AAT3601 QFN55-36
R9
1K
D1
GREEN
STAT_BAT
R10
1K
D1
GREEN
STAT
SYSOUT
Figure 12: AAT3601 Evaluation Kit Schematic.
34
OUT2
TP12
B1
Li+ Battery
24
14
OUT5
TP9
SYSOUT
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202210B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 20, 2013
C7
10μF
C8
10μF
C9
22μF
DATA SHEET
AAT3601
Total Power Solution for Portable Applications
Figure 13: AAT3601 Evaluation Kit Top Layer.
Figure 14: AAT3601 Evaluation Kit Mid1 Layer.
Figure 15: AAT3601 Evaluation Kit Mid2 Layer.
Figure 16: AAT3601 Evaluation Kit Bottom Layer.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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35
DATA SHEET
AAT3601
Total Power Solution for Portable Applications
Ordering Information
Package
Part Marking1
Part Number (Tape and Reel)2
TQFN55-36
2RXYY
AAT3601IIH-T1
Skyworks Green™ products are compliant with
all applicable legislation and are halogen-free.
For additional information, refer to Skyworks
Definition of Green™, document number
SQ04-0074.
Packaging Information
TQFN55-363
R = 0.1
3.600 ± 0.050
5.000 ± 0.050
Index Area
(D/2 x E/2)
C = 0.3
5.000 ± 0.050
Detail "A"
3.600 ± 0.050
Bottom View
Top View
0.750 ± 0.050
0.450 ± 0.050
0.200 ± 0.050
0.203 REF
+ 0.050
0.000 - 0.000
Side View
0.40 BSC
Detail "A"
All dimensions in millimeters.
1. XYY = assembly and date code.
2. Sample stock is generally held on part numbers listed in BOLD.
3. The leadless package family, which includes QFN, TQFN, DFN, TDFN and STDFN, has exposed copper (unplated) at the end of the lead terminals due to the manufacturing
process. A solder fillet at the exposed copper edge cannot be guaranteed and is not required to ensure a proper bottom solder connection.
36
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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DATA SHEET
AAT3601
Total Power Solution for Portable Applications
Copyright © 2012, 2013 Skyworks Solutions, Inc. All Rights Reserved.
Information in this document is provided in connection with Skyworks Solutions, Inc. (“Skyworks”) products or services. These materials, including the information contained herein, are provided by Skyworks as a
service to its customers and may be used for informational purposes only by the customer. Skyworks assumes no responsibility for errors or omissions in these materials or the information contained herein. Skyworks may change its documentation, products, services, specifications or product descriptions at any time, without notice. Skyworks makes no commitment to update the materials or information and shall have no
responsibility whatsoever for conflicts, incompatibilities, or other difficulties arising from any future changes.
No license, whether express, implied, by estoppel or otherwise, is granted to any intellectual property rights by this document. Skyworks assumes no liability for any materials, products or information provided hereunder, including the sale, distribution, reproduction or use of Skyworks products, information or materials, except as may be provided in Skyworks Terms and Conditions of Sale.
THE MATERIALS, PRODUCTS AND INFORMATION ARE PROVIDED “AS IS” WITHOUT WARRANTY OF ANY KIND, WHETHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE, INCLUDING FITNESS FOR A PARTICULAR
PURPOSE OR USE, MERCHANTABILITY, PERFORMANCE, QUALITY OR NON-INFRINGEMENT OF ANY INTELLECTUAL PROPERTY RIGHT; ALL SUCH WARRANTIES ARE HEREBY EXPRESSLY DISCLAIMED. SKYWORKS DOES
NOT WARRANT THE ACCURACY OR COMPLETENESS OF THE INFORMATION, TEXT, GRAPHICS OR OTHER ITEMS CONTAINED WITHIN THESE MATERIALS. SKYWORKS SHALL NOT BE LIABLE FOR ANY DAMAGES, INCLUDING BUT NOT LIMITED TO ANY SPECIAL, INDIRECT, INCIDENTAL, STATUTORY, OR CONSEQUENTIAL DAMAGES, INCLUDING WITHOUT LIMITATION, LOST REVENUES OR LOST PROFITS THAT MAY RESULT FROM
THE USE OF THE MATERIALS OR INFORMATION, WHETHER OR NOT THE RECIPIENT OF MATERIALS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Skyworks products are not intended for use in medical, lifesaving or life-sustaining applications, or other equipment in which the failure of the Skyworks products could lead to personal injury, death, physical or environmental damage. Skyworks customers using or selling Skyworks products for use in such applications do so at their own risk and agree to fully indemnify Skyworks for any damages resulting from such improper
use or sale.
Customers are responsible for their products and applications using Skyworks products, which may deviate from published specifications as a result of design defects, errors, or operation of products outside of published parameters or design specifications. Customers should include design and operating safeguards to minimize these and other risks. Skyworks assumes no liability for applications assistance, customer product
design, or damage to any equipment resulting from the use of Skyworks products outside of stated published specifications or parameters.
Skyworks, the Skyworks symbol, and “Breakthrough Simplicity” are trademarks or registered trademarks of Skyworks Solutions, Inc., in the United States and other countries. Third-party brands and names are for
identification purposes only, and are the property of their respective owners. Additional information, including relevant terms and conditions, posted at www.skyworksinc.com, are incorporated by reference.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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37
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