LM3658
www.ti.com
SNVS328E – MAY 2005 – REVISED MARCH 2007
LM3658 Dual Source USB/AC Li Chemistry Charger IC for Portable Applications
Check for Samples: LM3658
FEATURES
DESCRIPTION
•
The LM3658 is a single chip charger IC designed for
handheld applications. It can safely charge and
maintain a single cell Li-Ion/Polymer battery operating
from an AC wall adapter or USB power source. Input
power source selection of USB/AC is automatic. With
both power sources present, the AC power source
has priority. Charge current is programmed through
an external resistor when operating from an AC wall
adapter allowing charge currents from 50 mA to 1000
mA. When the battery is charged using USB power,
charge currents of 100 mA or 500 mA are pinselectable. The termination voltage is controlled to
within ±0.35% of 4.2V.
1
2
•
•
•
•
•
•
•
•
•
•
•
•
•
Integrated Power FETs with Thermal
Regulation
Charges from Either an AC Wall Adapter or
USB Power Source with Automatic Source
Selection
50 mA to 1000 mA Charge Currents Using AC
Wall Adapter
Pin-Selectable USB Charge Currents of 100
mA or 500 mA
LDO Mode with 1A of Source Current is
Automatically Invoked When the Battery is
Absent and the AC Wall Adapter is Connected
Continuous Battery Temperature Monitoring
Built-in Multiple Safety Timers
Charge Status Indication
Continuous Over-current and Temperature
Protection
Near-depleted Battery Pre-conditioning
Sleep Mode with Ultra Low Quiescent Current
On-board Kelvin-sensing Achieves ±0.35%
Termination Accuracy
Maintenance Mode with Automatic Recharge
Thermally Enhanced 3 mm x 3 mm WSON
Package
APPLICATIONS
•
•
•
•
•
Smartphones
Digital Still Cameras
PDAs
Hard Drive and Flash-based MP3 Players
USB-powered Devices
The LM3658 requires few external components and
integrates internal power FETs, reverse current
protection and current sensing. The internal power
FETs are thermally regulated to obtain the most
efficient charging rate for a given ambient
temperature.
The LM3658 operates in five modes: pre-qualification
mode, constant-current mode, constant-voltage
mode, top-off mode and maintenance mode.
Additionally, the charger IC operates as a linear
regulator in “LDO mode”, when the AC wall adapter is
connected and no battery is present. Optimal battery
management is obtained through thermal regulation,
battery temperature measurement and multiple safety
timers. The LM3658 provides two open-drain outputs
for LED status indication or connection to GPIOs.
Typical Application
CHG_IN
4.5V to 6V
1
BATT
10
1 PF
USBpwr
4.5V to 6V
1 PF
+
Battery
Pack
2
1 PF
LM3658
9
Ts
Iset
GND
USB_sel
EN_b
3
8
4
7
5
6
Stat1
Stat2
1
2
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2005–2007, Texas Instruments Incorporated
LM3658
SNVS328E – MAY 2005 – REVISED MARCH 2007
www.ti.com
Connection Diagram and Package Mark Information
1
2
3
4
Die-Attach
Pad (DAP)
GND
5
10
10
9
9
1
2
8
8
Die-Attach
Pad (DAP)
7
7
GND
6
6
Top View
3
4
5
Bottom View
Figure 1. WSON10 Package Drawing
Pin Descriptions
Pin #
Name
Description
1
CHG_IN
AC wall adapter input pin.
2
USBpwr
USB power input pin.
3
GND
Power and signal ground pin.
4
USB_sel
Pulling this pin low limits the USB charge current to 100 mA. Pulling this pin high limits the USB charge current to
500 mA.
5
EN_b
Pulling this pin low enables the charger. Pulling this pin high disables the charger.
6
STAT2
Active low open-drain output. Indicates charger status. This pin is capable of driving an LED as well as GPIOs.
See Operation Description section for more detail.
7
STAT1
Active low open-drain output. Indicates charger status. This pin is capable of driving an LED as well as GPIO. See
Operation Description section for more detail.
8
ISET
A resistor is connected between this pin and GND. The resistor value determines the full-rate charge current when
using the AC source.
9
TS
Battery temperature sense pin. This pin must be connected to battery pack’s temperature sense output pin.
For the LM3658SD-B version, leaving this pin open indicates that the battery pack is not present. The charger IC
will invoke LDO mode if this pin is left floating. See Operation Description section for more detail.
10
BATT
Positive battery terminal connection.
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
ABSOLUTE MAXIMUM RATINGS
(1) (2) (3)
−0.3V to +6.5V
CHG_IN, USBpwr (VCC)
−0.3V to CHG_IN or USBpwr
All other pins except GND
Power Dissipation
(4)
Internally Limited
Junction Temperature (TJ-MAX)
+150°C
−65°C to +150°C
Storage Temperature Range
ESD Rating
(5)
Human Body Model:
Machine Model:
(1)
(2)
(3)
(4)
(5)
2
2.0 kV
200V
All voltages are with respect to the potential at the GND pin.
Absolute Maximum Ratings indicate limits beyond which damage to the component may occur. Operating Ratings are conditions under
which operation of the device is specified. Operating Ratings do not imply specified performance limits. For specified performance limits
and associated test conditions, see the Electrical Characteristics tables.
If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and
specifications.
The LM3658 has built-in thermal regulation to regulate the die temperature to 120ºC. See Operation Description section for more detail.
The Human body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin. The machine model is a 200 pF
capacitor discharged directly into each pin. MIL-STD-883 3015.7
Submit Documentation Feedback
Copyright © 2005–2007, Texas Instruments Incorporated
Product Folder Links: LM3658
LM3658
www.ti.com
SNVS328E – MAY 2005 – REVISED MARCH 2007
OPERATING RATINGS
(1) (2)
Input Voltage Range for CHG_IN
4.5V to 6.0V
Input Voltage Range for USB_pwr
4.35V to 6.0V
Recommended Load Current
0 to 1000 mA
Power Dissipation (3)
Internally Limited
Junction Temperature (TJ) Range
−40°C to +125°C
Ambient Temperature (TA) Range
−40°C to +85°C
(1)
(2)
(3)
Absolute Maximum Ratings indicate limits beyond which damage to the component may occur. Operating Ratings are conditions under
which operation of the device is specified. Operating Ratings do not imply specified performance limits. For specified performance limits
and associated test conditions, see the Electrical Characteristics tables.
All voltages are with respect to the potential at the GND pin.
The LM3658 has built-in thermal regulation to regulate the die temperature to 120ºC. See Operation Description section for more detail.
THERMAL PROPERTIES
θJA, Junction-to-Ambient Thermal Resistance
(1)
(1)
54°C/W
Junction-to-ambient thermal resistance is highly application and board-layout dependent. In applications where high maximum power
dissipation exists, special care must be paid to thermal dissipation issues in board design. Please refer to application note AN-1187
(SNOA401) for more detail.
ELECTRICAL CHARACTERISTICS
Unless otherwise noted, VCC (VCHG_IN and/or VUSBpwr) = 5V, VBATT = 3.5V. CCHG_IN = 1 µF, CUSBpwr = 1 µF, CBATT = 1 µF. Typical
values and limits appearing in normal type apply for TJ = 25°C. Limits appearing in boldface type apply over TJ = 0°C to
+85°C. (1) (2) (3)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
CHARGER
VCHG_IN
AC Wall Adapter Input Voltage
Range
4.5
6.0
V
VUSBpwr
USB Input Voltage Range
4.35
6.0
V
ICC_PD
Quiescent Current in Power
Down Mode
VBATT > VCC–VOK_CHG
1
5
µA
ICC_STBY
Quiescent Current in Standby
Mode
VBATT < VCC − VOK_CHG
VCC > VPOR
EN_b = High
400
600
µA
IBATT_PD
Battery Leakage Current in
Power Down Mode
VBATT > VCC + VOK_CHG
0.01
2.0
µA
IBATT_MAI
Battery Leakage Current in
Maintenance Mode
STAT1 = off, STAT2 = on, adapter or USB
connected, VBATT = 4.2V
7
15
µA
VOK_CHG
CHG_IN or USBpwr OK TripPoint
VCC – VBATT (Rising)
VCC – VBATT (Falling)
200
50
mV
VPOR
VCC POR Trip-Point
VCC (Rising)
VBATT < VCC – VOK_CHG
VFULL_RATE < VBATT < VTERM
3.0
V
Battery Charge Termination
Voltage
ICHG = 10% of its value when VBATT = 3.5V
4.2
V
Battery Charge Termination
Voltage Tolerance
TA = 25°C
−0.35
+0.35
TA = 0°C to 85°C
−1.5
+1.5
VCHG_DO
CHG_IN Drop-Out Voltage
VBATT = VTERM, ICHG = 1A
VCC > VBATT + VCHG_DO_MAX
500
mV
VUSB_DO
USBpwr Drop-Out Voltage
VBATT = VTERM, USB_sel = high
VCC > VBATT + VUSB_DO_MAX
250
mV
NT
VTERM
(1)
(2)
(3)
%
All voltages are with respect to the potential at the GND pin.
Min and Max limits are specified by design, test, or statistical analysis. Typical numbers are not specified, but do represent the most
likely norm.
LM3658 is not intended as a Li-Ion battery protection device; battery used in this application should have an adequate internal
protection.
Submit Documentation Feedback
Copyright © 2005–2007, Texas Instruments Incorporated
Product Folder Links: LM3658
3
LM3658
SNVS328E – MAY 2005 – REVISED MARCH 2007
www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
Unless otherwise noted, VCC (VCHG_IN and/or VUSBpwr) = 5V, VBATT = 3.5V. CCHG_IN = 1 µF, CUSBpwr = 1 µF, CBATT = 1 µF. Typical
values and limits appearing in normal type apply for TJ = 25°C. Limits appearing in boldface type apply over TJ = 0°C to
+85°C. (1)(2)(3)
Symbol
ICHG
ICHG
KISET
VISET
Parameter
Conditions
Min
Typ
Max
Units
1000
mA
CHG_IN Full-Rate Charge
Current Range (see full-rate
charge mode description)
6V ≥ VCC ≥ 4.5V
VBATT < VCC – VOK_CHG
VFULL_RATE < VBATT < VTERM
ICHG = KISET/RISET
50
CHG_IN Full Rate Charge
Current
RISET = 10kΩ
220
245
270
RISET = 5 kΩ
465
500
535
RISET = 3.3kΩ
700
760
820
mA
Charge Current Set Coefficient
ICHG = KISET/RISET (see full-rate
charge mode description)
6V ≥ VCC ≥ 4.5V
VBATT < VCC – VOK_CHG
VFULL_RATE < VBATT < VTERM
2500
AΩ
Charge Current Set Voltage
6V ≥ VCC ≥ 4.5V
VBATT < VCC – VOK_CHG
VFULL_RATE < VBATT < VTERM
2.5
V
IUSB_L
USB Full-Rate Charge Low
Current
80
90
100
mA
IUSB_H
USB Full-Rate Charge High
Current
400
450
500
mA
IPREQUAL
Pre-Qualification Current
VBATT = 2V, for both AC adapter and USB
35
45
55
mA
VFULL_RA
Full-Rate Qualification
Threshold
VBATT rising, transition from pre-qualification to fullrate charging
2.9
3.0
3.1
V
Full Rate Hysteresis
VBATT falling
50
60
70
mV
7
9
11
%
6V ≥ VCC ≥ 4.5V
VBATT < VCC – VOK_CHG
VBATT = VTERM
1.25
2.5
3.75
%
VBATT falling, transition from EOC to prequalification mode
3.94
4.0
4.07
V
Battery Temperature Sense
Comparator Low-Voltage
Threshold
0.46
0.49
0.52
V
Battery Temperature Sense
Comparator High-Voltage
Threshold
2.44
2.49
2.54
V
ITSENSE
Battery Temperature Sense
Current
94
100
106
µA
TREG
Regulated Junction
Temperature
120
°C
TSD
Thermal Shutdown
Temperature
165
°C
VTLDO
LDO mode detection threshold
TS pin voltage for entry into LDO mode.
For LM3658SD-B only
3.95
4.0
v
VLDO
LDO Mode Regulation
6V ≥ VCHG_IN ≥ 4.5V
TS= Floating
IBATT = 100mA
-3.0
4.2
+3.0
40
60
100
ms
27
30
33
mins
Deglitch Time for PreQualification to Full-Rate
Charge Transition
270
300
330
ms
Deglitch Time for Full-Rate to
Pre-Qualification Transition
270
300
330
ms
TE
End-of-Charge Current, Percent 6V ≥ VCC ≥ 4.5V
from Full-Range Current
VBATT < VCC – VOK_CHG
VFULL_RATE < VBATT < VTERM
IEOC
ITOPOFF
Minimum Top-Off Charge
Current
VRESTART Restart Threshold Voltage
VTL
VTH
%
DETECTION AND TIMING
TPOK
Power OK Deglitch Time
VBATT < VCC – VOK_CHG
TPREQUAL Pre-Qualification Timer
TPQ_FULL
TFULL_PQ
4
Submit Documentation Feedback
Copyright © 2005–2007, Texas Instruments Incorporated
Product Folder Links: LM3658
LM3658
www.ti.com
SNVS328E – MAY 2005 – REVISED MARCH 2007
ELECTRICAL CHARACTERISTICS (continued)
Unless otherwise noted, VCC (VCHG_IN and/or VUSBpwr) = 5V, VBATT = 3.5V. CCHG_IN = 1 µF, CUSBpwr = 1 µF, CBATT = 1 µF. Typical
values and limits appearing in normal type apply for TJ = 25°C. Limits appearing in boldface type apply over TJ = 0°C to
+85°C. (1)(2)(3)
Symbol
Min
Typ
Max
LM3658SD, LM3658SD-B and LM3658SD-A with
USB_sel=high
270
300
330
LM3658SD-A with USB_sel=low
540
600
660
Deglitch Time for End-ofCharge Transition
270
300
330
ms
TBATTEMP Deglitch Time for Battery
Temperature Fault
20
40
80
ms
TDGL
Deglitch Time for EN_b and
USB_sel Pins
20
40
80
ms
TITOPOFF
Deglitch Time for ITOPOFF
ms
TTOPOFF
Top-Off Charging Timer
TCHG
TEOC
Parameter
Charge Timer
Conditions
270
300
330
LM3658SD, LM3658SD-B and LM3658SD-A with
USB_sel=high
27
30
33
LM3658SD-A with USB_sel=low
54
60
66
EN_b
0
Units
mins
mins
I/O
VIL
Low-Level Input Voltage
0.7
USB_sel
VIH
High-Level Input Voltage
V
1.5
EN_b
1.4
USB_sel
2.5
10
IOL
Low-Level Output Current
STAT1, STAT2, output voltage = 0.25V
IOH
High-Level Output Current
STAT1, STAT2, output voltage = 6.0V
V
25
0.01
mA
1
Submit Documentation Feedback
Copyright © 2005–2007, Texas Instruments Incorporated
Product Folder Links: LM3658
µA
5
LM3658
SNVS328E – MAY 2005 – REVISED MARCH 2007
www.ti.com
BLOCK DIAGRAM
Body
Switcher
CHG_IN
BATT
Power
Supply
Body
Switcher
Ts
USBpwr
Voltage
Current
References
Setting
and Thermo
Block
Iset
Sensor
Current/Voltage
GND
Control Loop with
Voltage/Current Limits
LDO_on
+
USB_sel
+
BATT
BATT
TEMP
STAT1
STAT2
+
+
EN_b
6
+
VTERM
Logic
and
Timers
Iset
+
VFULL_RATE
+
VEOC
VRESTART
Submit Documentation Feedback
Copyright © 2005–2007, Texas Instruments Incorporated
Product Folder Links: LM3658
LM3658
www.ti.com
SNVS328E – MAY 2005 – REVISED MARCH 2007
Li-Ion Charging Profile
1C
1C
Battery Voltage/Battery Current
Battery Voltage
4.2V
4.0V
Battery
Current
3.0V
0.1C
50 mA
0.025C
Time
Prequalification
Constant Current
TPREQUAL
STAT1
STAT2
Maintenance Constant
Current
Constant Voltage
TCHG
ON
OFF
TTOPOFF
TCHG
OFF
ON
ON
OFF
Submit Documentation Feedback
Copyright © 2005–2007, Texas Instruments Incorporated
Product Folder Links: LM3658
7
LM3658
SNVS328E – MAY 2005 – REVISED MARCH 2007
www.ti.com
LM3658 OPERATION DESCRIPTION
POWER-DOWN MODE
The LM3658 will power down automatically when the voltage on the USBpwr or CHG_IN pin drops below the
battery voltage with an amount that is equal to VOK_CHG (VBATT > VCC - VOK_CHG). Power-Down mode shuts off the
internal power FETs as well as the open-drain pull-down transistors on the status pins STAT1 and STAT2. The
only current consumed by the LM3658 is an ultra-low quiescent current of 1 µA typical.
POWER-ON RESET
As soon as the voltage of one of the power sources rises above VBATT + VOK_CHG, the charger will wake up.
However, charging will not be initiated unless the supply voltage source exceeds the VPOR.
AUTOMATIC POWER SOURCE DETECTION
When the voltage of one of the power sources exceeds the VPOR threshold, the LM3658 detects which power
source is a valid charge supply. When both supply voltages are valid and present, CHG_IN will automatically be
selected over USBpwr. The USBpwr will be the designated power source only if no CHG_IN is present or when
the voltage on the CHG_IN pin is less than the battery voltage.
THERMAL POWER FET REGULATION
The internal power FETs are thermally regulated to the junction temperature of 120ºC to specify optimal charging
of the battery. At all times is the charge current limited by the ISET resistor setting, the USB 100 mA/500 mA
selection, or the 100ºC junction temperature of the LM3658. The charge current is therefore a function of the
charge current settings, the thermal conductivity of the package and the ambient temperature as described in the
following equation:
120°C - T A
KISET
]
ICHG = min [
or USB_sel or
RISET
TJA(VCC - VBATT)
Where TA is the ambient temperature and θJA is the thermal resistance of the package. Thermal regulation
specifies maximum charge current and superior charge rate without exceeding the power dissipation limits of the
LM3658.
PRE-QUALIFICATION MODE
During pre-qualification, STAT1 is on and STAT2 is off, and the charger supplies a constant current of 50 mA to
the battery. When the battery voltage reaches VFULL_RATE, the charger transitions from pre-qualification to full-rate
charging. The pre-qualification mode aborts when the battery doesn’t reach VFULL_RATE within the time allowed in
TPREQUAL timer. In this event, charging stops and STAT1 and STAT2 will both be on, indicating a bad battery
condition.
CHG_IN FULL-RATE CHARGING MODE
The full-rate charge cycle is initiated following the successful completion of the pre-qualification mode. Timer
TCHG starts to count when the charger enters full-rate charging, with STAT1 on and STAT2 off. When charging
with an AC wall adapter, the full-rate charge current is proportional to the value of the resistor that is connected
to the ISET pin as described in the following equation:
KISET
ICHG =
RISET
It is recommended to charge Li-Ion batteries at 1C rate, where “C” is the capacity of the battery. As an example,
it is recommended to charge a 750 mAh battery at 750 mA, or 1C. Charging at a higher rate can cause damage
to the battery.
8
Submit Documentation Feedback
Copyright © 2005–2007, Texas Instruments Incorporated
Product Folder Links: LM3658
LM3658
www.ti.com
SNVS328E – MAY 2005 – REVISED MARCH 2007
USBpwr FULL-RATE CHARGING MODE
The full-rate charge cycle is initiated following the successful completion of the pre-qualification mode. Timer
TCHG starts to count when the charger enters full-rate charging, with STAT1 on and STAT2 off. If the USB bus
provides the charger supply, then the default full-rate charge current is 100 mA max unless the USB_sel pin is
pulled high, which sets the charge current to 500 mA max.
CONSTANT-VOLTAGE CHARGING MODE AND END-OF-CHARGE (EOC) DETECTION
The battery voltage increases rapidly as a result of full-rate charging and will reach the 4.2V termination voltage,
triggering the constant-voltage charge cycle. Timer TCHG continues to count in this cycle. STAT1 is on and
STAT2 is off. The charge current gradually decreases during constant-voltage charging until it reaches the EndOf-Charge (EOC), which is equal to 10% of the full-rate current set either by the resistor connected to the ISET pin
or the USB_sel pin. If Timer TCHG times out before EOC is reached, charging stops and STAT1 and STAT2 will
both be on, indicating a bad battery condition.
TOP-OFF CHARGING MODE
Once EOC has been reached, a top-off cycle continues to charge the battery. Timed top-off cycle provides
optimal battery capacity following a complete charge cycle. During this cycle, charging terminates when ICHG
reaches 2.5% of the full-rate charge current or when TTOPOFF times out, whichever occurs first. STAT1 will turn
off and STAT2 will turn on once the top-off cycle completes successfully, indicating that charging is done.
MAINTENANCE MODE
Maintenance mode begins immediately after the charger successfully finishes the top-off cycle. In the
maintenance mode, the battery voltage is being monitored by the LM3658 continuously. If the battery voltage
drops 200 mV below VTERM, a new full-rate charge cycle starts to replenish the battery. As this new full-rate
charge cycle begins, STAT1 will turn on and STAT2 will turn off, and all the timers will reset. Refer to the
LM3658 Flowchart.
CHARGE STATUS OUTPUTS
The LM3658 provides two open-drain outputs STAT1 and STAT2 that can be connected to external LEDs or to
General Purpose I/O’s (GPIO) of a peripheral IC. All charge status of the LM3658 is illustrated in Table 1. “ON”
means that STATx pin is pulled low as its pull-down transistor is turned on, representing a logic 0.
Table 1. Status Pins Summary
STAT1
STAT2
Condition
OFF
OFF
Power-Down, charging is suspended or
interrupted
ON
OFF
Pre-qualification mode, CC and CV
charging, Top-off mode
OFF
ON
Charge is completed
ON
ON
Bad battery (Safety timer expired), or LDO
mode
SAFETY TIMERS
In order to prevent endless charging of the battery, which can cause damage to the battery, there are three
safety timers that forcefully terminate charging if the charging mode is not completed within the time allowed.
Pre-Qualification Timer (TPREQUAL)
The pre-qualification timer starts with the initiation of the pre-qualification mode and allows 30 minutes to
transition from pre-qualification to full rate charging. If the battery voltage does not reach VFULL_RATE in 30
minutes, charging stops and status pins STAT1 and STAT2 both turn on to indicate a bad battery status.
Submit Documentation Feedback
Copyright © 2005–2007, Texas Instruments Incorporated
Product Folder Links: LM3658
9
LM3658
SNVS328E – MAY 2005 – REVISED MARCH 2007
www.ti.com
Charger Timer (TCHG)
The charge timer starts with the initiation of full-rate charging and has a duration of 5 hours for the LM3658. If the
charge current does not reach EOC, charging stops and STAT1 and STAT2 both turn on to indicate a bad
battery status. Once the charge control declares a bad battery, removing the input source is the only means to
clear the bad battery status.
Top-Off Timer (TTOPOFF)
Once the charger successfully completes constant current constant voltage charging, it enters top-off mode and
starts TTOPOFF timer. Topoff lasts 30 minutes for the LM3658. During top-off, charging stops when TTOPOFF
reaches its count or when ICHG reaches 2.5% of the full-rate charge current. There is no time-out condition in topoff mode.
When charging is interrupted either by battery temperature out of range or disabling the LM3658, the applicable
safety timer will store its count value for the duration of the interruption and subsequently resumes counting from
its stored count value when charging continues, only if the charger resumes to the same operation mode it was
in before the interrupt.
The LM3658SD-A version has selectable timers for TCHG and TTOPOFF. Based on the logic level applied to the
USB_sel pin, timers can be chosen as follow:
Input
USB_SEL
TPREQUAL
TCHG
TTOPOFF
CHG_IN
Low
30 minutes
10 hours
60 minutes
CHG_IN
High
30 minutes
5 hours
30 minutes
USBpwr
Low
30 minutes
10 hours
60 minutes
USBpwr
High
30 minutes
5 hours
30 minutes
BATTERY TEMPERATURE MONITORING (SUSPEND MODE)
The LM3658 is equipped with a battery thermistor interface to continuously monitor the battery temperature by
measuring the voltage between the TS pin and ground. Charging is allowed only if the battery temperature is
within the acceptable temperature range set by a pair of internal comparators inside the LM3658. If the battery
temperature is out of range, STAT1 and STAT2 both turn off and charging is suspended. Timer holds its count
value.
The TS pin is only active during charging and draws no current from the battery when no external power source
is present.
If the TS pin is not used in the application, it should be connected to GND through 10kΩ pulldown resistor.
When the TS pin is left floating (battery removal), then the charger will be disabled as the TS voltage exceeds
the upper temperature limit.
Ts
ntc
+
Logic
charger
control
+
-
hiRef
loRef
The LM3658 battery temperature feature is tailored to use negative temperature coefficient (NTC) 103AT
thermistors with 10kΩ impedance. If alternative thermistors need to be used in the system, supplemental external
resistors are needed to create a circuit with equivalent impedance.
10
Submit Documentation Feedback
Copyright © 2005–2007, Texas Instruments Incorporated
Product Folder Links: LM3658
LM3658
www.ti.com
SNVS328E – MAY 2005 – REVISED MARCH 2007
Ts
R2
+
Logic
charger
control
+
-
R1
ntc
hiRef
loRef
DISABLING CHARGER (CHARGE INTERRUPT MODE)
Charging can be safely interrupted by pulling the EN_b pin high and charging can resume upon pulling the EN_b
pin low. The enable pin can be permanently tied to GND with no extra current consumption penalty during power
down mode. When the charger is disabled, timer holds its count value, and STAT1 and STAT2 are both off.
LDO MODE (AVAILABLE ONLY IN LM3658SD-B VERSION)
The LM3658SD-B version enters LDO mode when the Ts pin is floating and AC wall adapter is still connected to
CHG_IN pin. In LDO mode, STAT1 and STAT2 are both on. The LM3658SD-B becomes a linear regulator
capable of delivering 1A of source current. Normally the Ts pin is connected to the thermistor from the battery
pack for temperature monitoring purpose. If this pin is disconnected, the LM3658SD-B assumes that there is no
battery present and will automatically invoke the LDO mode. LDO mode allows applications to operate without a
battery provided that the AC wall adapter supplies power to the CHG_IN pin. The LDO mode is not possible in
USB mode.
For the other versions of the LM3658, floating the Ts pin does not invoke LDO mode. Instead, it will go to
suspend mode. Please refer to “ Battery Temperature Monitoring” section for more detail.
5 HOUR/ 10 HOUR SELECTABLE TIMER (AVAILABLE ONLY IN LM3658SD-A VERSION)
The LM3658SD-A allows the user to select between 5 hour or 10 hour timer based on the polarity of the
USB_sel pin, in both CHG_IN mode and USBpwr mode. By pulling the USB_sel pin high, the timer is set to 5
hours. In the USBpwr mode, the polarity of the USB_sel pin determines the charge current as well as the timer.
In CHG_IN mode, the polarity of the USB_sel pin determines only the timer. The charge current is set by the
resistor at Iset pin.
INPUT/OUTPUT BYPASS CAPACITORS
Care should be taken to support the stability of the charge system by connecting a 1 µF capacitor as close as
possible to the BATT pin. An input capacitor ranging from 1.0 µF– 10.0 µF must be connected to the CHG_IN
and USBpwr input pins. Low cost ceramic capacitors can be selected.
THERMAL PERFORMANCE OF THE WSON PACKAGE
The LM3658 is a monolithic device with integrated power FETs. For that reason, it is important to pay special
attention to the thermal impedance of the WSON package and to the PCB layout rules in order to maximize
power dissipation of the WSON package.
The WSON package is designed for enhanced thermal performance and features an exposed die attach pad at
the bottom center of the package that creates a direct path to the PCB for maximum power dissipation.
Compared to the traditional leaded packages where the die attach pad is embedded inside the molding
compound, the WSON reduces one layer in the thermal path.
Submit Documentation Feedback
Copyright © 2005–2007, Texas Instruments Incorporated
Product Folder Links: LM3658
11
LM3658
SNVS328E – MAY 2005 – REVISED MARCH 2007
www.ti.com
The thermal advantage of the WSON package is fully realized only when the exposed die attach pad is soldered
down to a thermal land on the PCB board with thermal vias planted underneath the thermal land. Based on
thermal analysis of the WSON package, the junction-to-ambient thermal resistance (θJA) can be improved by a
factor of two when the die attach pad of the WSON package is soldered directly onto the PCB with thermal land
and thermal vias, as opposed to an alternative with no direct soldering to a thermal land. Typical pitch and outer
diameter for thermal vias are 1.27 mm and 0.33 mm respectively. Typical copper via barrel plating is 1 oz,
although thicker copper may be used to further improve thermal performance. The LM3658 die attach pad is
connected to the substrate of the IC and therefore, the thermal land and vias on the PCB board need to be
connected to ground (GND pin).
For more information on board layout techniques, refer to Application Note 1187 (SNOA401) “Leadless Lead
Frame Package (LLP).” This application note also discusses package handling, solder stencil and the assembly
process.
12
Submit Documentation Feedback
Copyright © 2005–2007, Texas Instruments Incorporated
Product Folder Links: LM3658
LM3658
www.ti.com
SNVS328E – MAY 2005 – REVISED MARCH 2007
LM3658 FLOWCHARTS
LDO mode
From any mode (except POR &
power down)
If Ts pin is floating, LM3658 goes to
the LDO mode after 300 msec
deglitch
Powerdown Mode
No
VCC >
VBATT + VOK
Yes
Yes
Ts pin
Is floating
Yes
Suspend Mode
From any mode except
POR and Powerdown
If Ts pin is not in desired
range, LM3658 enters
Suspend mode. Timer stops.
Ts pin
out of window
No
No
POR Mode
Yes
VCC >
VPOR
Yes
Yes
CHG_IN
present
No
USBpwr
present
Yes
Charge Interrupt
Mode
Timer stops
CHG_IN Mode
No
En_b
low
USBpwr Mode
Yes
Bad Battery Mode
Disconnect power
Source to restart
Charger.
Maintenance Mode
No
VBATT <
VRESTART
Yes
Figure 2. LM3658 Flowchart
Submit Documentation Feedback
Copyright © 2005–2007, Texas Instruments Incorporated
Product Folder Links: LM3658
13
LM3658
SNVS328E – MAY 2005 – REVISED MARCH 2007
www.ti.com
USBpwr
CCCV Mode
CHG_IN
present
Topoff Mode
Yes
CHG_IN
present
Go to
POR
USB_SEL is
High
Prequalification
Mode
CHG_IN
present
Yes
Go to
POR
No
Set Ichg =
100 mA
Yes
Yes
Go to
Bad
Battery
Mode
TCHG
expire
No
No
VBATT t
VFULL_RATE
Yes
Go to
Charger
Interrupt
Mode
Yes
Go to
Bad
Battery
Mode
En_b
High
VBATT <
VRESTART
No
VBATT <
VFULL_RATE
IEOC
detected
Yes
Go to
Charger
Interrupt
Mode
Yes
Go to
POR
No
TTOPOFF
expire
No
Yes
Set Ichg =
500 mA
No
No
Yes
Yes
Maintenance Mode
No
Go to
Charger
Interrupt
Mode
No
TPREQUAL
expire
USB_SEL is
High
Set Ichg =
500 mA
No
No
En_b
High
Yes
Set
Ichg=100
mA
En_b
High
Go to
POR
No
No
USBpwr Mode
Yes
No
Yes
No
ICHG <
ITOPOFF
Figure 3. LM3658 USBpwr Mode Flowchart
CHG_IN Mode
CHG_IN
Prequalification
Mode
En_b
High
CHG_IN
Yes
Go to
Charger
Interrupt
Mode
Yes
Go to
Bad
Battery
Mode
En_b
High
No
TPREQUAL
expire
Yes
Go to
Charger
Interrupt
Mode
Yes
Go to
Bad
Battery
Mode
En_b
High
No
TCHG
expire
VBATT t
VFULL_RATE
Yes
VBATT <
VRESTART
VBATT <
VFULL_RATE
IEOC
Yes
Go to
Charger
Interrupt
Mode
Yes
Go to
POR
No
TTOPOFF
expire
No
No
Maintenance Mode
No
No
No
No
Topoff Mode
CCCV Mode
No
Yes
No
detected
ICHG <
ITOPOFF
Figure 4. LM3658 CHG_IN Mode Flowchart
14
Submit Documentation Feedback
Copyright © 2005–2007, Texas Instruments Incorporated
Product Folder Links: LM3658
PACKAGE OPTION ADDENDUM
www.ti.com
10-Dec-2020
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
(2)
Lead finish/
Ball material
MSL Peak Temp
Op Temp (°C)
Device Marking
(3)
(4/5)
(6)
LM3658SD-A/NOPB
ACTIVE
WSON
DSC
10
1000
RoHS & Green
NIPDAU | SN
Level-1-260C-UNLIM
-40 to 85
L155B
LM3658SD-B/NOPB
ACTIVE
WSON
DSC
10
1000
RoHS & Green
NIPDAU | SN
Level-1-260C-UNLIM
-40 to 85
L156B
LM3658SD/NOPB
ACTIVE
WSON
DSC
10
1000
RoHS & Green
NIPDAU | SN
Level-1-260C-UNLIM
-40 to 85
L111B
LM3658SDX-A/NOPB
ACTIVE
WSON
DSC
10
4500
RoHS & Green
SN
Level-1-260C-UNLIM
-40 to 85
L155B
LM3658SDX-B/NOPB
ACTIVE
WSON
DSC
10
4500
RoHS & Green
NIPDAU | SN
Level-1-260C-UNLIM
-40 to 85
L156B
LM3658SDX/NOPB
ACTIVE
WSON
DSC
10
4500
RoHS & Green
NIPDAU | SN
Level-1-260C-UNLIM
-40 to 85
L111B
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of
工商网监
湘ICP备2023018690号
