LTC3677-3
Highly Integrated
Portable Product PMIC
Description
Features
Full Featured Li-Ion/Polymer Charger/PowerPath™
Controller with Instant-On Operation
n Triple Adjustable High Efficiency Step-Down
Switching Regulators (800mA, 500mA, 500mA IOUT)
n I2C Adjustable SW Slew Rates for EMI Reduction
n High Temperature Battery Voltage Reduction
Improves Safety and Reliability
n Overvoltage Protection Controller for USB (V
BUS)/Wall
Inputs Provide Protection to 30V
n 1.5A Maximum Charge Current with Thermal Limiting
n Battery Float Voltage: 4.2V
n Pushbutton ON/OFF Control with System Reset
n Dual 150mA Current Limited LDOs
n Start-Up Timing Compatible with SiRF Atlas IV
Processor
n Small 4mm × 7mm 44-Pin QFN Package
n
Applications
PNDs, DMB/DVB-H, Digital/Satellite Radio,
Media Players
n Portable Industrial/Medical Products
n Other USB-Based Handheld Products
n
The LTC®3677-3 is a highly integrated power management
IC for single-cell Li-Ion/Polymer battery applications.
It includes a PowerPath manager with automatic load
prioritization, a battery charger, an ideal diode, input overvoltage protection and numerous other internal protection
features. The LTC3677-3 is designed to accurately charge
from current limited supplies such as USB by automatically
reducing charge current such that the sum of the load
current and the charge current does not exceed the programmed input current limit (100mA or 500mA modes).
The LTC3677-3 reduces the battery voltage at elevated
temperatures to improve safety and reliability. The three
step-down switching regulators and two LDOs provide
a wide range of available supplies. The LTC3677-3 also
includes a pushbutton input to control power sequencing
and system reset. The LTC3677-3 has pushbutton timing and sequencing designed to support the SiRF Atlas
IV processor. The LTC3677-3 is available in a low profile
4mm × 7mm × 0.75mm 44-pin QFN package.
L, LT, LTC, LTM, Linear Technology, PowerPath, Burst Mode and the Linear logo are registered
trademarks and Bat-Track and Hot Swap are trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners. Protected by U.S. Patents,
including 6522118, 6700364, 7511390, 5481178, 6580258. Other patents pending.
Typical Application
High Temperature BAT Discharge
5V
ADAPTER
OPTIONAL
USB
200
100mA/500mA
1000mA
VNTC < VTOO_HOT
180 VBUS = 0V
VOUT
CHARGE
PB
140
CC/CV
CHARGER
LTC3677-3
2
160
0V
I2C PORT
PUSHBUTTON
CONTROL
+
NTC
0.8V to 3.6V/150mA
0.8V to 3.6V/150mA
DUAL LDO
REGULATORS
TRIPLE HIGH
EFFICIENCY
STEP-DOWN
SWITCHING
REGULATORS
SINGLE-CELL
Li-Ion
0.8V to 3.6V/800mA
0.8V to 3.6V/500mA
0.8V to 3.6V/500mA
36773 TA01a
IBAT (mA)
OVERVOLTAGE
PROTECTION
120
100
80
60
40
20
0
3.8
3.9
4.0
VBAT (V)
4.1
4.2
36773 TA01b
36773f
LTC3677-3
Table of Contents
Features............................................................................................................................. 1
Applications........................................................................................................................ 1
Typical Application................................................................................................................ 1
Description......................................................................................................................... 1
Absolute Maximum Ratings...................................................................................................... 3
Order Information.................................................................................................................. 3
Pin Configuration.................................................................................................................. 3
Electrical Characteristics......................................................................................................... 4
Typical Performance Characteristics..........................................................................................10
Pin Functions......................................................................................................................15
Block Diagram.....................................................................................................................18
Operation..........................................................................................................................19
PowerPath OPERATION......................................................................................................................................... 19
Low Dropout Linear Regulator Operation.............................................................................................................. 27
Step-Down Switching Regulator Operation............................................................................................................ 28
I2C Operation......................................................................................................................................................... 32
Pushbutton Interface Operation............................................................................................................................. 36
Layout and Thermal Considerations...................................................................................................................... 40
Typical Application...............................................................................................................42
Package Description.............................................................................................................43
Typical Application...............................................................................................................44
Related Parts......................................................................................................................44
36773f
LTC3677-3
Pin Configuration
VBUS, VOUT , VIN12, VIN3, VINLDO1, VINLDO2, WALL
t < 1ms and Duty Cycle < 1%.................... –0.3V to 7V
Steady State............................................. –0.3V to 6V
CHRG, BAT, PWR_ON, EXTPWR, PBSTAT, PGOOD,
FB1, FB2, FB3, LDO1, LDO1_FB, LDO2,
LDO2_FB, DVCC, SCL, SDA, EN3.................. –0.3V to 6V
NTC, PROG, CLPROG, ON, ILIM0, ILIM1
(Note 4)............................................ –0.3V to VCC + 0.3V
IVBUS, IVOUT , IBAT, Continuous (Note 16)......................2A
ISW3, Continuous (Note 16).................................. 850mA
ISW2, ISW1, Continuous (Note 16)......................... 600mA
ILDO1, ILDO2, Continuous (Note 16)...................... 200mA
ICHRG , IACPR , IEXTPWR , IPBSTAT, IPGOOD...................75mA
IOVSENS...................................................................10mA
ICLPROG, IPROG..........................................................2mA
Operating Junction Temperature Range
(Note 2)................................................–40°C to 85°C
Maximum Junction Temperature............................110°C
Storage Temperature Range................... –65°C to 125°C
TOP VIEW
44 CHRG
43 CLPROG
42 EXTPWR
41 ACPR
40 VBUS
39 VOUT
38 BAT
(Notes 1, 2, 3)
ILIM0 1
ILIM1 2
NC 3
WALL 4
SW3 5
VIN3 6
FB3 7
OVSENS 8
NC 9
DVCC 10
SDA 11
SCL 12
OVGATE 13
PWR_ON 14
ON 15
45
GND
37 IDGATE
36 PROG
35 NTC
34 NTCBIAS
33 SW1
32 VIN12
31 SW2
30 VINLD02
29 LDO2
28 LDO1
27 VINLDO1
26 FB1
25 FB2
24 LDO2_FB
23 LDO1_FB
PBSTAT 16
EN3 17
NC 18
NC 19
NC 20
PGOOD 21
NC 22
Absolute Maximum Ratings
UFF PACKAGE
44-LEAD (7mm s 4mm) PLASTIC QFN
TJMAX = 110°C, θJA = 45°C/W
EXPOSED PAD (PIN 45) IS GND, MUST BE SOLDERED TO PCB
Order Information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3677EUFF-3#PBF
LTC3677EUFF-3#TRPBF
36773
44-Lead (4mm × 7mm) Plastic QFN
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
36773f
LTC3677-3
Electrical
Characteristics
Power Manager. The l denotes the specifications which apply over the
full operating junction temperature range, otherwise specifications are at TJ = 25°C. VBUS = 5V, VBAT = 3.8V, ILIM0 = ILIM1 = 5V,
WALL = 0V, VINLDO2 = VINLOD1 = VIN12 = VIN3 = VOUT, RPROG = 2k, RCLPROG = 2.1k, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Input Power Supply
VBUS
Input Supply Voltage
4.35
IBUS_LIM
Total Input Current (Note 5)
ILIM0 = 5V, ILIM1 = 5V (1x Mode)
ILIM0 = 0V, ILIM1 = 0V (5x Mode)
ILIM0 = 0V, ILIM1 = 5V (10x Mode)
IBUSQ
Input Quiescent Current, POFF State
1x, 5x, 10x Modes
ILIM0 = 5V, ILIM1 = 0V (Suspend Mode)
hCLPROG
Ratio of Measured VBUS Current to
CLPROG Program Current
VCLPROG
CLPROG Servo Voltage in Current
Limit
1x Mode
5x Mode
10x Mode
VUVLO
VBUS Undervoltage Lockout
Rising Threshold
Falling Threshold
VDUVLO
RON_ILIM
l
l
l
80
450
900
3.5
5.5
V
90
475
950
100
500
1000
mA
mA
mA
0.42
0.05
0.1
mA
mA
1000
mA/mA
0.2
1.0
2.0
V
V
V
3.8
3.7
3.9
V
V
VBUS to VOUT Differential Undervoltage Rising Threshold
Lockout
Falling Threshold
50
–50
100
mV
mV
Input Current Limit Power FET
On-Resistance (Between VBUS and VOUT)
200
mΩ
Battery Charger
VFLOAT
VBAT Regulated Output Voltage
LTC3677-3
LTC3677-3, 0 ≤ TJ ≤ 85°C
4.179
4.165
4.200
4.200
4.221
4.235
V
V
ICHG
Constant-Current Mode Charge Current RPROG = 1k, Input Current Limit = 2A
IC Not in Thermal Limit
RPROG = 2k, Input Current Limit = 1A
RPROG = 5k, Input Current Limit = 0.4A
950
465
180
1000
500
200
1050
535
220
mA
mA
mA
IBATQ_OFF
Battery-Drain Current, POFF State,
Buck3 Disabled, No Load (Note 14)
VBAT = 4.3V, Charger Time Out
VBUS = 0V
6
55
27
100
µA
µA
IBATQ_ON
Battery-Drain Current, PON State,
Buck3 Enabled (Notes 10, 14)
VBUS = 0V, IOUT = 0µA, No Load On
Supplies, Burst Mode® Operation
130
200
µA
VPROG,CHG
PROG Pin Servo Voltage
VBAT > VTRKL
1.000
V
VPROG,TRKL
PROG Pin Servo Voltage in Trickle
Charge
VBAT < VTRKL
0.100
V
hPROG
Ratio of IBAT to PROG Pin Current
1000
mA/mA
ITRKL
Trickle Charge Current
VBAT < VTRKL
40
50
60
mA
VTRKL
Trickle Charge Rising Threshold
Trickle Charge Falling Threshold
VBAT Rising
VBAT Falling
2.5
2.9
2.75
3.0
V
V
∆VRECHRG
Recharge Battery Threshold Voltage
Threshold Voltage Relative to VFLOAT
–75
–100
–125
mV
tTERM
Safety Timer Termination Period
Timer Starts when VBAT = VFLOAT – 50mV
3.2
4
4.8
Hour
tBADBAT
Bad Battery Termination Time
VBAT < VTRKL
0.4
0.5
0.6
Hour
hC/10
End-of-Charge Indication Current Ratio (Note 6)
0.085
0.1
0.11
mA/mA
RON_CHG
Battery Charger Power FET
On-Resistance (Between VOUT and BAT)
200
mΩ
TLIM
Junction Temperature in ConstantTemperature Mode
110
°C
l
l
l
36773f
LTC3677-3
Electrical
Characteristics
Power Manager. The l denotes the specifications which apply over the
full operating junction temperature range, otherwise specifications are at TJ = 25°C. VBUS = 5V, VBAT = 3.8V, ILIM0 = ILIM1 = 5V,
WALL = 0V, VINLDO2 = VINLOD1 = VIN12 = VIN3 = VOUT, RPROG = 2k, RCLPROG = 2.1k, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
NTC, Battery Discharge Protection
VCOLD
Cold Temperature Fault Threshold
Voltage
Rising NTC Voltage
Hysteresis
75
76
1.3
77
%VNTCBIAS
%VNTCBIAS
VHOT
Hot Temperature Fault Threshold
Voltage
Falling NTC Voltage
Hysteresis
34
35
1.3
36
%VNTCBIAS
%VNTCBIAS
VTOO_HOT
NTC Discharge Threshold Voltage
Falling NTC Voltage
Hysteresis
24.5
25.5
50
26.5
%VNTCBIAS
mV
INTC
NTC Leakage Current
VNTC = VBUS = 5V
–50
IBAT2HOT
BAT Discharge Current
VBAT = 4.1V, NTC < VTOO_HOT
170
mA
VBAT2HOT
BAT Discharge Threshold
IBAT < 0.1mA, NTC < VTOO_HOT
3.9
V
VFWD
Forward Voltage Detection
IOUT = 10mA
RDROPOUT
Diode On-Resistance, Dropout
IOUT = 200mA
200
mΩ
IMAX
Diode Current Limit
(Note 7)
3.6
A
50
nA
Ideal Diode
5
15
25
mV
Overvoltage Protection
VOVCUTOFF
Overvoltage Protection Threshold
Rising Threshold, ROVSENS = 6.2k
6.10
VOVGATE
OVGATE Output Voltage
Input Below VOVCUTOFF
Input Above VOVCUTOFF
IOVSENSQ
OVSENS Quiescent Current
VOVSENS = 5V
40
µA
tRISE
OVGATE Time to Reach Regulation
COVGATE = 1nF
2.5
ms
6.35
1.88 • VOVSENS
0
6.70
12
V
V
V
Wall Adapter and High Voltage Buck Output Control
VACPR
ACPR Pin Output High Voltage
ACPR Pin Output Low Voltage
IACPR = 0.1mA
IACPR = 1mA
VOUT – 0.3
VOUT
0
0.3
V
V
VW
Absolute Wall Input Threshold Voltage
VWALL Rising
VWALL Falling
3.1
4.3
3.2
4.45
V
V
∆VW
Differential Wall Input Threshold
Voltage
VWALL – VBAT Falling
VWALL – VBAT Rising
0
25
75
100
mV
mV
IQWALL
Wall Operating Quiescent Current
IWALL + IVOUT , IBAT = 0mA,
WALL = VOUT = 5V
440
µA
Logic (ILIM0, ILIM1 and CHRG)
VIL
Input Low Voltage
ILIM0, ILIM1
VIH
Input High Voltage
ILIM0, ILIM1
IPD
Static Pull-Down Current
ILIM0, ILIM1; VPIN = 1V
VCHRG
CHRG Pin Output Low Voltage
ICHRG = 10mA
ICHRG
CHRG Pin Input Current
VBAT = 4.5V, VCHRG = 5V
0.4
1.2
V
V
2
µA
0.15
0.4
V
0
1
µA
36773f
LTC3677-3
Electrical Characteristics
I2C Interface. The l denotes the specifications which apply over the full
operating junction temperature range, otherwise specifications are at TJ = 25°C. DVCC = 3.3V, VOUT = 3.8V, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
DVCC
Input Supply Voltage
IDVCC
DVCC Supply Current
VDVCC,UVLO
DVCC UVLO
1.0
VIH
Input High Voltage
50
VIL
Input Low Voltage
IIH
Input High Leakage Current
SDA = SCL = DVCC = 5.5V
–1
1
µA
IIL
Input Low Leakage Current
SDA = SCL = 0V, DVCC = 5.5V
–1
1
µA
VOL
SDA Output Low Voltage
ISDA = 3mA
0.4
V
400
kHz
1.6
SCL = 400kHz
SCL = SDA = 0kHz
30
MAX
UNITS
5.5
V
10
1
µA
µA
70
%DVCC
V
50
%DVCC
Timing Characteristics (Note 8) (All Values Are Referenced to VIH and VIL)
fSCL
SCL Clock Frequency
tLOW
Low Period of the SCL Clock
1.3
µs
tHIGH
High Period of the SCL Clock
0.6
µs
tBUF
Bus Free Time Between Stop and Start Condition
1.3
µs
tHD,STA
Hold Time After (Repeated) Start Condition
0.6
µs
tSU,STA
Set-Up Time for a Repeated Start Condition
0.6
µs
tSU,STO
Stop Condition Set-Up Time
0.6
tHD,DATO
Output Data Hold Time
tHD,DATI
Input Data Hold Time
tSU,DAT
Data Set-Up Time
tSP
Input Spike Suppression Pulse Width
0
µs
900
ns
0
ns
100
ns
50
ns
36773f
LTC3677-3
Electrical Characteristics
Step-Down Switching Regulators. The l denotes the specifications
which apply over the full operating junction temperature range, otherwise specifications are at TJ = 25°C. VOUT = VIN12 = VIN3 = 3.8V,
all regulators enabled unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Step-Down Switching Regulators (Buck1, Buck2 and Buck3)
VIN12, VIN3
Input Supply Voltage
(Note 9)
VOUT UVLO
VOUT Falling
VOUT Rising
VIN12 and VIN3 Connected to VOUT Through
Low Impedance. Switching Regulators Are
Disabled Below VOUT UVLO
2.5
fOSC
Oscillator Frequency
1.91
l
2.7
5.5
V
2.7
2.8
2.9
V
V
2.25
2.59
MHz
800mA Step-Down Switching Regulator 3 (Buck3-Enabled via EN3, Disabled in PDN and POFF States)
IVIN3Q
Pulse-Skipping Mode Input Current
(Note 10)
100
Burst Mode Operation Input Current
(Note 10)
20
µA
35
µA
Shutdown Input Current
EN3 = 0
ILIM3
Peak P-Channel MOSFET Current Limit
(Note 7)
VFB3
Feedback Voltage
Pulse-Skipping Mode
Burst Mode Operation
IFB3
FB3 Input Current
(Note 10)
–0.05
D3
Max Duty Cycle
FB3 = 0V
100
RP3
RDS(ON) of P-Channel MOSFET
0.3
Ω
RN3
RDS(ON) of N-Channel MOSFET
0.4
Ω
RSW3_PD
SW3 Pull-Down in Shutdown
VIL,EN3
EN3 Input Low Voltage
VIH,EN3
EN3 Input High Voltage
l
l
0.01
1
µA
1000
1400
1700
mA
0.78
0.78
0.8
0.8
0.82
0.824
V
V
0.05
µA
EN3 = 0
%
10
kΩ
0.4
1.2
V
V
500mA Step-Down Switching Regulator 2 (Buck2-Pushbutton Enabled, Third in Sequence)
IVIN12Q
Pulse-Skipping Mode Input Current
(Note 10)
100
Burst Mode Operation Input Current
(Note 10)
20
Shutdown Input Current
POFF State
0.01
1
µA
ILIM2
Peak P-Channel MOSFET Current Limit
(Note 7)
650
900
1200
mA
VFB2
Feedback Voltage
Pulse-Skipping Mode
Burst Mode Operation
0.78
0.78
0.8
0.8
0.82
0.824
V
V
IFB2
FB2 Input Current
(Note 10)
–0.05
0.05
µA
D2
Max Duty Cycle
FB2 = 0V
100
RP2
RDS(ON) of P-Channel MOSFET
ISW2 = 100mA
0.6
RN2
RDS(ON) of N-Channel MOSFET
ISW2 = –100mA
0.6
Ω
RSW2_PD
SW2 Pull-Down in Shutdown
POFF State
10
kΩ
100
µA
l
l
µA
µA
%
Ω
500mA Step-Down Switching Regulator 1 (Buck1-Pushbutton Enabled, Second in Sequence)
IVIN12Q
Pulse-Skipping Mode Input Current
(Note 10)
Burst Mode Operation Input Current
(Note 10)
20
Shutdown Input Current
µA
0.01
1
µA
650
900
1200
mA
0.78
0.78
0.8
0.8
0.82
0.824
V
V
0.05
µA
ILIM1
Peak P-Channel MOSFET Current Limit
(Note 7)
VFB1
Feedback Voltage
Pulse-Skipping Mode
Burst Mode Operation
IFB1
FB1 Input Current
(Note 10)
–0.05
D1
Max Duty Cycle
FB1 = 0V
100
RP1
RDS(ON) of P-Channel MOSFET
ISW1 = 100mA
0.6
Ω
RN1
RDS(ON) of N-Channel MOSFET
ISW1 = –100mA
0.6
Ω
RSW1_PD
SW1 Pull-Down in Shutdown
POFF State
10
kΩ
l
l
%
36773f
LTC3677-3
Electrical
Characteristics
LDO Regulators. The l denotes the specifications which apply over the
full operating junction temperature range, otherwise specifications are at TJ = 25°C. VINLDO1 = VINLDO2 = VOUT = 3.8V, LDO1 and LDO2
enabled unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
LDO Regulator 1 (LDO1-Always On)
VINLDO1
Input Voltage Range
VINLDO1 ≤ VOUT + 0.3V
VOUT_UVLO
VOUT Falling
VOUT Rising
LDO1 Is Disabled Below VOUT UVLO
VLDO1_FB
LDO1_FB Regulated Feedback Voltage
ILDO1 = 1mA
LDO1_FB Line Regulation (Note 11)
ILDO1 = 1mA, VIN = 1.65V to 5.5V
LDO1_FB Load Regulation (Note 11)
ILDO1 = 1mA to 150mA
l
l
1.65
5.5
V
2.5
2.7
2.8
2.9
V
V
0.78
0.8
0.82
mV/V
5
µV/mA
ILDO1_OC
Available Output Current
ILDO1_SC
Short-Circuit Output Current (Note 7)
VDROP1
Dropout Voltage (Note 12)
ILDO1 = 150mA, VINLDO1 = 3.6V
ILDO1 = 150mA, VINLDO1 = 2.5V
ILDO1 = 75mA, VINLDO1 = 1.8V
160
200
170
RLDO1_PD
Output Pull-Down Resistance in Shutdown
LDO1 Disabled
10
ILDO_FB1
LDO_FB1 Input Current
l
V
0.4
150
mA
270
–50
mA
260
320
280
mV
mV
mV
kΩ
50
nA
LDO Regulator 2 (LDO2-Pushbutton Enabled, First in Sequence)
VINLDO2
Input Voltage Range
VINLDO2 ≤ VOUT + 0.3V
VOUT_UVLO
VOUT Falling
VOUT Rising
LDO2 is Disabled Below VOUT UVLO
VLDO2_FB
LDO2_FB Regulated Output Voltage
ILDO2 = 1mA
LDO2_FB Line Regulation (Note 11)
ILDO2 = 1mA, VIN = 1.65V to 5.5V
LDO2_FB Load Regulation (Note 11)
ILDO2 = 1mA to 150mA
l
l
1.65
5.5
V
2.5
2.7
2.8
2.9
V
V
0.78
0.8
0.82
mV/V
5
µV/mA
ILDO2_OC
Available Output Current
ILDO2_SC
Short-Circuit Output Current (Note 7)
VDROP2
Dropout Voltage (Note 12)
ILDO2 = 150mA, VINLDO2 = 3.6V
ILDO2 = 150mA, VINLDO2 = 2.5V
ILDO1 = 75mA, VINLDO1 = 1.8V
160
200
170
RLDO2_PD
Output Pull-Down Resistance in Shutdown
LDO2 Disabled
14
ILDO_FB2
LDO_FB2 Input Current
l
150
mA
270
–50
V
0.4
mA
260
320
280
mV
mV
mV
kΩ
50
nA
36773f
LTC3677-3
Electrical
Characteristics
Pushbutton Controller. The l denotes the specifications which apply
over the full operating junction temperature range, otherwise specifications are at TJ = 25°C. VOUT = 3.8V, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Pushbutton Pin (ON)
VOUT
Pushbutton Operating Supply Range
(Note 9)
VOUT UVLO
VOUT Falling
VOUT Rising
Pushbutton is Disabled Below VOUT UVLO
VON_TH
ON Threshold Rising
ON Threshold Falling
ION
ON Input Current
l
VON = VOUT
VON = 0V
2.7
5.5
V
2.5
2.7
2.8
2.9
V
V
0.4
0.8
0.7
1.2
V
V
–1
–4
–9
1
–14
μA
μA
0.4
0.8
0.7
1.2
V
V
Power-On Input Pin (PWR_ON)
VPWR_ON
PWR_ON Threshold Rising
PWR_ON Threshold Falling
IPWR_ON
PWR_ON Input Current
VPWR_ON = 3V
–1
–1
1
μA
Status Output Pins (PBSTAT, EXTPWR, PGOOD)
IPBSTAT
PBSTAT Output High Leakage Current
VPBSTAT = 3V
1
μA
VPBSTAT
PBSTAT Output Low Voltage
IPBSTAT = 3mA
0.1
0.4
V
IEXTPWR
EXTPWR Pin Input Current
VEXTPWR = 3V
0
1
μA
VEXTPWR
EXTPWR Pin Output Low Voltage
IEXTPWR = 2mA
0.15
0.4
V
IPGOOD
PGOOD Output High Leakage Current
VPGOOD = 3V
1
μA
VPGOOD
PGOOD Output Low Voltage
IPGOOD = 3mA
0.1
VTHPGOOD
PGOOD Threshold Voltage
(Note 13)
–8
%
50
ms
PBSTAT Low > tPBSTAT_PW
900
μs
50
ms
50
ms
–1
0.4
V
Pushbutton Timing Parameters
tON_PBSTAT1
ON Low Time to PBSTAT Low
tON_PBSTAT2
ON High to PBSTAT High
tPBSTAT_PW
PBSTAT Minimum Pulse Width
tON_PUP
ON Low Time for Power-Up
tON_RST
ON Low to PGOOD Reset Low
tON_RST_PW
PGOOD Reset Low Pulse Width
tPUP_PDN
Minimum Time from Power Up to Down
1
Seconds
tPDN_PUP
Minimum Time from Power Down to Up
1
Seconds
tPWR_ONH
PWR_ON High to Power-Up
50
ms
tPWR_ONL
PWR_ON Low to Power-Down
50
ms
tPWR_ONBK1
PWR_ON Power-Up Blanking
PWR_ON Low Recognized from Power-Up
1
Seconds
tPWR_ONBK2
PWR_ON Power-Down Blanking
PWR_ON High Recognized from Power-Down
1
Seconds
tPGOODH
From Regulation to PGOOD High
Buck1, 2 and LDO1 Within PGOOD Threshold
230
tPGOODL
Bucks Disabled to PGOOD Low
Bucks Disabled
tLDO2_BK1
LDO2 Enable to Buck Enable
40
12
14
16.5
1.8
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC3677-3 is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 85°C operating
junction temperature range are assured by design, characterization and
correlation with statistical process controls. Note that the maximum
Seconds
ms
ms
44
12.5
14.5
µs
17.5
ms
ambient temperature is determined by specific operating conditions in
conjunction with board layout, the rated package thermal resistance and
other environmental factors.
Note 3: This IC includes over temperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperatures will exceed 110°C when over temperature protection is
active. Continuous operation above the specified maximum operating
junction temperature may result in device degradation or failure.
36773f
LTC3677-3
Electrical Characteristics
Note 4: VCC is the greater of VBUS, VOUT or BAT.
Note 5: Total input current is the sum of quiescent current, IBUSQ, and
measured current given by VCLPROG/RCLPROG • (hCLPROG + 1).
Note 6: hC/10 is expressed as a fraction of measured full charge current
with indicated PROG resistor.
Note 7: The current limit features of this part are intended to protect the
IC from short term or intermittent fault conditions. Continuous operation
above the maximum specified pin current rating may result in device
degradation or failure.
Note 8: The serial port is tested at rated operating frequency. Timing
parameters are tested and/or guaranteed by design.
Note 9: VOUT not in UVLO.
Note 10: Buck FB high, not switching.
Note 11: Measured with the LDO running unity gain with output tied to
feedback pin.
Note 12: Dropout voltage is the minimum input to output voltage
differential needed for an LDO to maintain regulation at a specified output
current. When an LDO is in dropout, its output voltage will be equal to
VIN – VDROP .
Note 13: PGOOD threshold is expressed as a percentage difference
from the Buck1, Buck2 and LDO1 regulation voltages. The threshold is
measured from Buck1, Buck2 and LDO1 output rising.
Note 14: The IBATQ specifications represent the total battery load assuming
VINLDO1, VINLDO2, VIN12 and VIN3 are tied directly to VOUT .
Note 15: Long-term current density rating for the part.
Typical Performance Characteristics TJ = 25°C unless otherwise specified
Input Supply Current
vs Temperature
0.7
0.10
VBUS = 5V
1x MODE
450
VBUS = 5V
350
NO LOAD ON
ALL SUPPLIES
VBAT = 3.8V
VBUS = 0V
300
IVBUS (mA)
0.5
0.4
0.3
0.06
0.04
250
200
150
0.2
50
0
50
75
25
TEMPERATURE (°C)
100
125
36773 G01
0
–50
ALL SUPPLIES ENABLED
Burst Mode OPERATION
100
0.02
0.1
0
–50 –25
ALL SUPPLIES ENABLED
PULSE-SKIPPING MODE
400
0.08
0.6
IVBUS (mA)
Battery-Drain Current
vs Temperature
IBAT (µA)
0.8
Input Supply Current
vs Temperature (Suspend Mode)
–25
50
25
0
75
TEMPERATURE (°C)
100
125
36773 G02
0
–50
ALL SUPPLIES DISABLED EXCEPT LDO1
–25
50
25
0
75
TEMPERATURE (°C)
100
125
36773 G03
36773f
10
LTC3677-3
Typical Performance Characteristics TJ = 25°C unless otherwise specified
10x MODE
240
700
220
600
RON (mΩ)
IVBUS (mA)
800
5x MODE
500
120
1x MODE
100
0
–50
–25
50
25
0
75
TEMPERATURE (°C)
100
0
–50
125
6
4.24
5
4.22
4
300
3
200
SAFETY
TIMER
2
TERMINATION
C/10
IBAT
5
6
0
4.10
4.18
0
200
400
600
IBAT (mA)
2.8
4.04
–50 –25
1000
800
3.2
3.6
VBAT (V)
VBAT = 3.2V
36773 G10
0
125
36773 G09
30
VBAT = 3.6V
VBAT = 4.2V
VFWD (V)
4.4
100
VBAT = 3.8V
VBUS = 0V
TA = 25°C
35
25
20
15
10
0.05
4.0
50
75
25
TEMPERATURE (°C)
Forward Voltage vs Ideal Diode
Current (with Si2333DS External FET)
40
VBUS = 0V
TA = 25°C
0
357734 G08
0.10
VBUS = 5V
10x MODE
RPROG = 2k
RCLPROG = 2k
2.4
4.12
4.06
0.15
FALLING
VBAT
2.0
4.14
4.10
0.20
100
4.16
4.08
0.25
RISING
VBAT
357734 G06
4.20
Forward Voltage vs Ideal Diode
Current (No External FET)
500
125
IBAT = 2mA
4.22
36773 G07
600
200
4.24
VBUS = 5V
10x MODE
4.14
4.12
100
Battery Regulation (Float)
Voltage vs Temperature
4.16
1
50
25
75
0
TEMPERATURE (°C)
36773 G05
4.18
IBAT vs VBAT
300
0
–50 –25
125
100
4.20
VFLOAT (V)
400
VBAT AND VCHRG (V)
VBAT
400
50
25
0
75
TEMPERATURE (°C)
Battery Float Voltage
Load Regulation
CHRG
3
4
TIME (HOUR)
–25
36773 G04
600
1450mAhr
CELL
100 VBUS = 5V
RPROG = 2k
RCLPROG = 2k
0
0
2
1
VBUS = 5V
10x MODE
RPROG = 2k
100
100
Battery Current and Voltage
vs Time
500
300
200
140
200
IBAT (mA)
400
VBUS = 5.5V
160
300
IBAT (mA)
VBUS = 4.5V
VBUS = 5V
180
400
Charge Current vs Temperature
(Thermal Regulation)
500
260
900
0
600
IOUT = 400mA
280
IBAT (mA)
1000
300
VBUS = 5V
RCLPROG = 2.1k
VBAT (V)
1100
Input RON vs Temperature
VFWD (mV)
1200
Input Current Limit
vs Temperature
5
0
0.2
0.4
0.6
IBAT (A)
0.8
1.0
1.2
36773 G11
0
0
0.2
0.4
0.6
IBAT (A)
0.8
1.0
36773 G12
36773f
11
LTC3677-3
Typical Performance Characteristics TJ = 25°C unless otherwise specified
Input Disconnect Waveform
Input Connect Waveform
Switching from 1x to 5x Mode
VBUS
5V/DIV
VBUS
5V/DIV
VOUT
5V/DIV
VOUT
5V/DIV
IBUS
0.5A/DIV
IBUS
0.5A/DIV
IBUS
0.5A/DIV
IBAT
0.5A/DIV
IBAT
0.5A/DIV
IBAT
0.5A/DIV
VBAT = 3.75V
IOUT = 100mA
RCLPROG = 2k
RPROG = 2k
36773 G13
1ms/DIV
ILIM0/ILIM1
5V/DIV
VBAT = 3.75V
IOUT = 100mA
RCLPROG = 2k
RPROG = 2k
Switching from Suspend Mode
to 5x Mode
36773 G14
1ms/DIV
VBAT = 3.75V
IOUT = 50mA
RCLPROG = 2k
RPROG = 2k
WALL Connect Waveform
WALL
5V/DIV
WALL
5V/DIV
VOUT
5V/DIV
IBUS
0.5A/DIV
VOUT
5V/DIV
IWALL
0.5A/DIV
VOUT
5V/DIV
IWALL
0.5A/DIV
IBAT
0.5A/DIV
IBAT
0.5A/DIV
IBAT
0.5A/DIV
36773 G16
100µs/DIV
VBAT = 3.75V
IOUT = 100mA
RPROG = 2k
36773 G17
1ms/DIV
Oscillator Frequency
vs Temperature
100
VBAT = 3.75V
IOUT = 100mA
RPROG = 2k
Burst Mode
90 OPERATION
2.6
80
2.5
70
VOUT = 5V
2.3
2.2
VOUT = 3.8V
2.1
1ms/DIV
PULSE-SKIPPING
60
50
40
30
2.0
20
VOUT1 = 3.3V
1.9
10
VIN12 = 3.8V
VIN12 = 5V
1.8
–50
–25
50
25
0
75
TEMPERATURE (°C)
100
125
36773 G19
36773 G18
Step-Down Switching Regulator 1
3.3V Output Efficiency vs IOUT1
2.7
EFFICIENCY (%)
FREQUENCY (MHz)
2.8
2.4
36773 G15
WALL Disconnect Waveform
ILIM0
5V/DIV
VBAT = 3.75V
IOUT = 100mA
RCLPROG = 2k
RPROG = 2k
ILIM1 = 5V
1ms/DIV
0
0.01
0.1
1
10
IOUT (mA)
100
1000
36773 G20
36773f
12
LTC3677-3
Typical Performance Characteristics TJ = 25°C unless otherwise specified
EFFICIENCY (%)
80
100
90
Burst Mode
OPERATION
PULSE-SKIPPING
60
50
40
60
VOUT2 = 1.8V
20
10
VIN12 = 3.8V
VIN12 = 5V
0
0.01
0.1
1
10
IOUT (mA)
100
1000
900
500mA BUCK
800
IOUT3
700
600
500
–50 –25
5mA
0
50
75
25
TEMPERATURE (°C)
100
125
36773 G24
SWITCH IMPEDANCE (Ω)
0.8
VINX = 3.2V
0.7
0.6
500mA
NMOS
500mA
PMOS
0.5
0.4
800mA PMOS
0.3
0
–50
0.85
0.84
0.84
0.83
0.83
0
25
50
75
TEMPERATURE (°C)
100
125
36773 G27
1000
36773 G23
0.81
0.80
0.79
0.75
0.1
36773 G26
VOUT1 = 3.3V
50µs/DIV
IOUT1 = 30mA
VOUT2 = 1.8V
IOUT2 = 20mA
VOUT3 = 1.2V
VOUT = VBAT = 3.8V
0.82
Burst Mode
OPERATION
PULSE-SKIPPING
Burst Mode
OPERATION
0.81
0.80
0.79
PULSE-SKIPPING
0.78
0.77
VIN3 = 3.8V
VIN3 = 5V
0.76
–25
5mA
0.85
0.77
0.1
100
500mA Step-Down Switching
Regulator Feedback Voltage
vs Output Current
0.78
800mA NMOS
0.2
1
10
IOUT (mA)
500mA
36773 G25
VOUT1 = 3.3V
50µs/DIV
IOUT1 = 10mA
VOUT2 = 1.8V
IOUT2 = 20mA
VOUT3 = 1.2V
VOUT = VBAT = 3.8V
0.82
FEEDBACK (V)
0.9
IOUT3
800mA Step-Down Switching
Regulator Feedback Voltage
vs Output Current
Step-Down Switching Regulator
Switch Impedance vs Temperature
0.1
VOUT1
50mV/DIV
(AC)
VOUT2
50mV/DIV
(AC)
VOUT3
100mV/DIV
(AC)
500mA
VINx = 3.8V
VINx = 5V
VOUT3 = 2.5V
VIN3 = 3.8V
VIN3 = 5V
Step-Down Switching Regulator
Output Transient (Pulse-Skipping)
FEEDBACK (V)
SHORT-CIRCUIT CURRENT (mA)
1100
30
0
0.01
1000
VOUT1
50mV/DIV
(AC)
VOUT2
50mV/DIV
(AC)
VOUT3
100mV/DIV
(AC)
800mA BUCK
1200
40
10
1500
1300
50
Step-Down Switching Regulator
Output Transient (Burst Mode
Operation)
Step-Down Switching Regulator
Short-Circuit Current vs Temperature
PULSE-SKIPPING
60
36773 G22
36773 G21
1400
70
20
VOUT3 = 1.2V
VIN3 = 3.8V
VIN3 = 5V
10
1000
Burst Mode
OPERATION
80
40
20
100
90
PULSE-SKIPPING
50
30
1
10
IOUT (mA)
100
70
30
0.1
Step-Down Switching Regulator 3
2.5V Output Efficiency
Burst Mode
OPERATION
80
70
0
0.01
Step-Down Switching Regulator 3
1.2V Output Efficiency vs IOUT3
EFFICIENCY (%)
90
EFFICIENCY (%)
100
Step-Down Switching Regulator 2
1.8V Output Efficiency vs IOUT2
1
10
IOUT (mA)
100
1000
357732 G29
VIN12 = 3.8V
VIN12 = 5V
0.76
0.75
0.1
1
10
IOUT (mA)
100
1000
36773 G29
36773f
13
LTC3677-3
Typical Performance Characteristics TJ = 25°C unless otherwise specified
Step-Down Switching Regulator 3
Soft-Start and Shutdown
OVP Connection Waveform
VOUT1
100mV/DIV
(AC)
2V
VBUS
5V/DIV
VOUT3 1V
0V
OVGATE
5V/DIV
400mA
IL3 200mA
0mA
VOUT1 = 1.8V
IOUT1 = 100mA
ROUT3 = 3Ω
36773 G30
50µs/DIV
OVP INPUT
VOLTAGE
0V TO 5V
STEP 5V/DIV
OVP Protection Waveform
36773 G31
500µs/DIV
OVP Reconnection Waveform
VBUS
5V/DIV
VBUS
5V/DIV
OVGATE
5V/DIV
OVP INPUT
VOLTAGE
5V TO 10V
STEP 5V/DIV
36773 G32
500µs/DIV
OVGATE
5V/DIV
OVP INPUT
VOLTAGE
10V TO 5V
STEP 5V/DIV
Rising Overvoltage Threshold
vs Temperature
OVSENS Quiescent Current
vs Temperature
6.280
VOVSENS = 5V
35
6.275
OPV THRESHOLD (V)
QUIESCENT CURRENT (µA)
37
33
31
29
27
–40
36773 G33
500µs/DIV
6.270
6.265
6.260
–15
35
10
TEMPERATURE (°C)
60
85
36773 G34
6.255
–40
–15
35
10
TEMPERATURE (°C)
60
85
36773 G35
36773f
14
LTC3677-3
Typical Performance Characteristics TJ = 25°C unless otherwise specified
OVGATE vs OVSENS
LDO Load Step
Too Hot BAT Discharge
200
12
OVSENS CONNECTED
TO INPUT THROUGH
10 6.2k RESISTOR
VNTC < VTOO_HOT
180 VBUS = 0V
LDO1
50mV/DIV
(AC)
160
140
LDO2
20mV/DIV
(AC)
6
4
IOUT1
2
0
IBAT (mA)
OVGATE (V)
8
0
2
4
6
INPUT VOLTAGE (V)
8
20
0
CURRENT (mA)
BATTERY DISCHARGE CURRENT (mA)
400
125
VBUS = 0V
75
50
60
70
90 100
80
TEMPERATURE (°C)
4.0
VBAT (V)
4.1
4.2
36773 G38
IIN
ILOAD
300
IBAT
(CHARGING)
200
100
VBAT = 4.1V
VNTC < VTOO_HOT
5x MODE
IVOUT = 0mA
25
0
RPROG = 2k
RCLPROG = 2k
500
VBUS = 5V
50
3.9
Input and Battery Current
vs Output Current
600
100
3.8
36773 G36
200
150
80
40
36773 G37
LDO1 = 1.2V
20µs/DIV
LDO2 = 2.5V
ILDO2 = 40mA
VOUT = VBAT = 3.8V
Battery Discharge vs Temperature
175
100
60
100mA
5mA
120
0
110
120
36773 G39
–100
IBAT
(DISCHARGING)
WALL = 0V
0
100
200
400
300
IOUT (mA)
500
600
36773 G40
Pin Functions
ILIM0, ILIM1 (Pins 1, 2): Input Current Control Pins. ILIM0
and ILIM1 control the input current limit. See Table 1 in the
USB PowerPath Controller section. Both pins are pulled
low by a weak current sink.
SW3 (Pin 5): Power Transmission (Switch) Pin for StepDown Switching Regulator 3 (Buck3).
NC (Pins 3, 9, 18, 19, 20, 22): No Connect. This pin has
no function and may be floated or connected to ground.
FB3 (Pin 7): Feedback Input for Step-Down Switching
Regulator 3 (Buck3). This pin servos to a fixed voltage of
0.8V when the control loop is complete.
WALL (Pin 4): Wall Adapter Present Input. Pulling this
pin above 4.3V will disconnect the power path from VBUS
to VOUT. The ACPR pin will also be pulled low to indicate
that a wall adapter has been detected.
VIN3 (Pin 6): Power Input for Step-Down Switching Regulator 3. This pin should be connected to VOUT.
OVSENSE (Pin 8): Overvoltage Protection Sense Input.
OVSENSE should be connected through a 6.2k resistor
to the input power connector and the drain of an external
36773f
15
LTC3677-3
Pin Functions
N-channel MOSFET pass transistor. When the voltage on
this pin exceeds a preset level, the OVGATE pin will be
pulled to GND to disable the pass transistor and protect
downstream circuitry.
DVCC (Pin 10): Supply Voltage for I2C Lines. This pin sets
the logic reference level of the LTC3677-3. A UVLO circuit
on the DVCC pin forces all registers to all 0s whenever DVCC
is
