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Linear Technology Electronic Components Datasheet

LTC1731-4.2 Datasheet

Single Cell Lithium-Ion Linear Battery Charger Controllers

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LTC1731-4.2 pdf
FEATURES
s Complete Linear Charger Controller for
1-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 (7µA 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
LTC1731-4.1/LTC1731-4.2
Single Cell Lithium-Ion Linear
Battery Charger Controllers
DESCRIPTIO
The LTC®1731 is a complete constant-current/constant-
voltage linear charger controller for single cell lithium-ion
batteries. Nickel-cadmium (NiCd) and nickel-metal-hy-
dride (NiMH) batteries can also be charged with constant
current using external termination. The external sense
resistor sets the charge current with 5% accuracy. An
internal resistor divider and precision reference set the
final float potential with ±1% accuracy. The output float
voltage is set internally to 4.1V (LTC1731-4.1) or 4.2V
(LTC1731-4.2).
When the input supply is removed, the LTC1731 automati-
cally enters a low current sleep mode, dropping the battery
drain current to typically 7µA. An internal comparator
detects the end-of-charge (C/10) condition while a pro-
grammable timer, using an external capacitor, sets the
total charge time. Fully discharged cells are automatically
trickle charged at 10% of the programmed current until
cell voltage exceeds 2.457V.
The LTC1731 is available in the 8-pin MSOP and SO
packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
500mA Li-Ion Battery Charger
VIN = 6V
MBRM120T3
CHARGE
STATUS
CTIMER
0.1µF
1k
2
7
VCC
SENSE
CHRG DRV
8
6
LTC1731-4.2
3
TIMER
1
BAT
5
PROG
GND
4
RPROG*
19.6k
RSENSE
0.2
Q1
Si9430DY
IBAT = 500mA
+ Li-ION
CELL
1µF
10µF
*SHUTDOWN INVOKED BY FLOATING THE PROG PIN
1731 TA01
1


Linear Technology Electronic Components Datasheet

LTC1731-4.2 Datasheet

Single Cell Lithium-Ion Linear Battery Charger Controllers

No Preview Available !

LTC1731-4.2 pdf
LTC1731-4.1/LTC1731-4.2
ABSOLUTE MAXIMUM RATINGS (Note 1)
Input Supply Voltage (VCC) ................................... 13.2V
Input Voltage (SENSE, DRV, BAT,
TIMER, PROG) .................................. – 0.3V to 13.2V
Output Voltage (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
LTC1731EMS8-4.1
LTC1731EMS8-4.2
MS8 PART MARKING
LTJK
LTKQ
Consult factory 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
LTC1731ES8-4.1
LTC1731ES8-4.2
S8 PART MARKING
173141
173142
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = 6V unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VCC
ICC
VBAT
IBAT
ITRIKL
VTRIKL
VUV
VUV
VMSD
Input Supply Voltage
Input Supply Current
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
Charger On, Current Mode
Shutdown Mode
Sleep Mode (Battery Drain Current)
LTC1731-4.1 (5V VCC 12V)
LTC1731-4.2 (5V VCC 12V)
RPROG = 19.6k, RSENSE = 0.2
RPROG = 19.6k, RSENSE = 0.2
RPROG = 97.6k, RSENSE = 0.2
VBAT = 2V, RPROG = 19.6k, ITRIKL = (VCC – VSENSE)/0.2
From Low to High
From Low to High
PROG Pin Low to High
PROG Pin High to Low
q 4.5
12
q 13
q 12
7 20
q 4.059 4.1 4.141
q 4.158 4.2 4.242
465 500 535
q 415
585
70 100 130
q 30 50 100
q 2.35 2.457 2.55
q 4.1 4.5
200
2.457
2.446
V
mA
mA
µA
V
V
mA
mA
mA
mA
V
V
mV
V
V
2


Part Number LTC1731-4.2
Description Single Cell Lithium-Ion Linear Battery Charger Controllers
Maker Linear Technology
Total Page 12 Pages
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