參數(shù)資料
型號: LTC1731CS8-8.2
廠商: LINEAR TECHNOLOGY CORP
元件分類: 穩(wěn)壓器
英文描述: BATTERY CHARGE CONTROLLER, PDSO8
封裝: 0.150 INCH, PLASTIC, SO-8
文件頁數(shù): 1/8頁
文件大小: 99K
代理商: LTC1731CS8-8.2
1
LTC1731
LINEAR TECHNOLOGY CONFIDENTIAL
Lithium-Ion Linear
Battery Charger Controller
July 1999
The LTC
1731 is a complete constant-current/constant-
voltage linear charge controller for lithium-ion batteries.
Nickel-cadmium (NiCd) and nickel metal-hydride (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, 4.2V, 8.2V or 8.4V.
When the input supply is removed, the LTC1731 automati-
cally enters a low current sleep mode, dropping the battery
drain current to 5
A. An internal comparator detects the
end-of-charge (C/10) condition while a programmable
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 2.5V.
The LTC1731 is available in the 8-pin MSOP and SO
packages.
s
Complete Linear Charger Controller for 1- or 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
4.1V, 4.2V, 8.2V and 8.4V Versions
s
Automatic Sleep Mode When Input Supply
is Removed (Only 5
A Battery Drain)
s
Automatic Trickle Charging of Low Voltage Cells
s
Programmable for Constant-Current-Only Mode
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.
FEATURES
DESCRIPTION
U
APPLICATIONS
U
TYPICAL APPLICATION
U
VCC
VIN
5V TO 15V
SENSE
DRV
1k
RSENSE
0.2
RPROG*
19.6k
Li-ION
CELL
LTC1731-4.1
*SHUTDOWN INVOKED BY FLOATING THE PROG PIN
BAT
CHRG
8
7
1N5817
10
F
1731 TA01
1
F
IBAT = 500mA
CTIMER
0.1
F
Q1
Si9430DY
6
1
5
4
+
2
3
TIMER
PROG
GND
500mA Li-Ion Charger
Electrical Specifications Subject to Change
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