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Linear Technology Electronic Components Datasheet

LTC1731-8.2 Datasheet

Lithium-Ion Linear Battery Charger Controller

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LTC1731-8.2 pdf
LTC1731-8.2/LTC1731-8.4
Lithium-Ion Linear
Battery Charger Controller
FEATURES
s Complete Linear Charger Controller for
2-Cell Lithium-Ion Batteries
s 1% Voltage Accuracy
s Programmable Charge Current
s C/10 Charge Current Detection Output
s Programmable Charge Termination Timer
s Space Saving 8-Pin MSOP Package
s Automatic Sleep Mode When Input Supply
is Removed (15µA Battery Drain)
s Automatic Trickle Charging of Low Voltage Cells
s Programmable for Constant-Current-Only Mode
U
APPLICATIO S
s Cellular Phones
s Handheld Computers
s Charging Docks and Cradles
s Programmable Current Source
, LTC and LT are registered trademarks of Linear Technology Corporation.
DESCRIPTIO
The LTC®1731-8.2/LTC1731-8.4 are complete constant-
current/constant-voltage linear charger controllers for 2-
cell lithium-ion (Li-Ion)batteries. Nickel-cadmium (NiCd)
and nickel-metal-hydride (NiMH) batteries can also be
charged with constant current using external termina-
tion. The external sense resistor sets the charge current
with 7% accuracy. An internal resistor divider and preci-
sion reference set the final float potential with 1% accu-
racy. The output float voltages are set internally to 8.2V
(LTC1731-8.2) or 8.4V (LTC1731-8.4).
When the input supply is removed, the LTC1731-8.2/
LTC1731-8.4 automatically enter a low current sleep mode,
dropping the battery drain current to typically 15µA. An
internal comparator detects the end-of-charge (C/10) con-
dition while a programmable timer, using an external
capacitor, sets the total charge time. Fully discharged cells
are automatically trickle charged at 10% of the pro-
grammed current until battery voltage exceeds 4.95V.
The LTC1731-8.2/LTC1731-8.4 are available in the 8-pin
MSOP and SO packages. For 1-cell Li-Ion battery charg-
ing, see the LTC1731-4.1 and LTC1731-4.2 data sheets.
TYPICAL APPLICATIO
400mA Li-Ion Charger
VIN = 9V
MBRM120T3
CHARGE
STATUS
CTIMER
0.1µF
2k
2
7
VCC
SENSE
CHRG DRV
8
6
LTC1731-8.4
3
TIMER
1
BAT
5
PROG
GND
4
RPROG*
19.6k
RSENSE
0.2
Q1
Si9430DY
IBAT = 400mA
+
2-CELL
Li-ION
1µF
10µF
*SHUTDOWN INVOKED BY FLOATING THE PROG PIN
1731 TA01
Typical Li-Ion Charge Cycle
CONSTANT
CURRENT
CONSTANT
VOLTAGE
9
BATTERY VOLTAGE
400 8
400mA HR BATTERY
300
CHARGE CURRENT
200 7
CHRG
LED OFF TIMER
100 STOPS
06
0 0.5 1.0 1.5 2.0 2.5 3.0
TIME (HOURS)
1731 TA01b
sn1731 17318fs
1


Linear Technology Electronic Components Datasheet

LTC1731-8.2 Datasheet

Lithium-Ion Linear Battery Charger Controller

No Preview Available !

LTC1731-8.2 pdf
LTC1731-8.2/LTC1731-8.4
ABSOLUTE MAXIMUM RATINGS (Note 1)
Input Supply Voltage (VCC) ................................... 13.2V
SENSE, DRV, BAT, TIMER, PROG ............ – 0.3V to VCC
CHRG ..................................................... – 0.3V to 13.2V
Operating Temperature Range (Note 2) .....– 40° to 85°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
PACKAGE/ORDER INFORMATION
TOP VIEW
BAT 1
CHRG 2
TIMER 3
GND 4
8 SENSE
7 VCC
6 DRV
5 PROG
MS8 PACKAGE
8-LEAD PLASTIC MSOP
TJMAX = 150°C, θJA = 200°C/W
ORDER PART
NUMBER
LTC1731EMS8-8.2
LTC1731EMS8-8.4
MS8 PART MARKING
LTSW
LTPE
Consult LTC Marketing for parts specified with wider operating temperature ranges.
TOP VIEW
BAT 1
CHRG 2
TIMER 3
GND 4
8 SENSE
7 VCC
6 DRV
5 PROG
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 150°C, θJA = 125°C/W
ORDER PART
NUMBER
LTC1731ES8-8.2
LTC1731ES8-8.4
S8 PART MARKING
173182
173184
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = 9V unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VCC Input Supply Voltage
ICC Input Supply Current
Charger On, Current Mode
Shutdown Mode
Sleep Mode (Battery Drain Current)
q 8.8
12
q 13
q 12
15 30
V
mA
mA
µA
VBAT
IBAT
ITRIKL
VTRIKL
VUV
VUV
VMSD
Regulated Output Voltage
Current Mode Charge Current
Trickle Charge Current
Trickle Charge Threshold Voltage
VCC Undervoltage Lockout Voltage
VCC Undervoltage Lockout Hysteresis
Manual Shutdown Threshold Voltage
LTC1731-8.2 (9V VCC 12V)
LTC1731-8.4 (9V VCC 12V)
RPROG = 19.6k, RSENSE = 0.2
RPROG = 19.6k, RSENSE = 0.2
RPROG = 97.6k, RSENSE = 0.2
VBAT = 4V, RPROG = 19.6k, ITRIKL = (VCC – VSENSE)/0.2
BAT Rising
VCC Rising
VCC Falling
PROG Pin Rising
PROG Pin Falling
q 8.118 8.2 8.282
q 8.316 8.4 8.484
465 500 535
q 415 500 585
70 100 130
q 30 50 100
q 4.7 4.95 5.1
q 8.2 8.8
200
2.457
2.446
V
V
mA
mA
mA
mA
V
V
mV
V
V
IDRV Drive Pin Current
VDRV = VCC – 2V
26 µA
2
sn1731 17318fs


Part Number LTC1731-8.2
Description Lithium-Ion Linear Battery Charger Controller
Maker Linear Technology
Total Page 12 Pages
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LTC1731-8.2 pdf
LTC1731-8.2 Datasheet PDF
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