Datasheet > LTC1731-4.2

LTC1731-4.2

更新时间： 2022-11-25 14:06:46

品牌	Logo	应用领域
凌特 - Linear		电池控制器
页数	文件大小	规格书
8页	148K
描述
Lithium-Ion Linear Battery Charger Controller

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LTC1731-4.2 数据手册

Final Electrical Specifications

LTC1731-4.2

Lithium-Ion Linear

Battery Charger Controller

December 1999

DESCRIPTION

FEATURES

The LTC^®1731-4.2 is a complete constant-current/con-

stant-voltage linear charge controller for lithium-ion bat-

teries. 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 4.2V.

■

Complete Linear Charger Controller for

1-Cell Lithium-Ion Batteries

■

1% Voltage Accuracy

■

Programmable Charge Current

■

C/10 Charge Current Detection Output

■

Programmable Charge Termination Timer

■

Space Saving 8-Pin MSOP Package

■

Automatic Sleep Mode When Input Supply

is Removed (Only 7µA Battery Drain)

■

Automatic Trickle Charging of Low Voltage Cells

When the input supply is removed, the LTC1731-4.2

automatically enters a low current sleep mode, dropping

the battery drain current to 5µA. 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 2.5V.

■

Programmable for Constant-Current-Only Mode

APPLICATIONS

■

Cellular Phones

■

Handheld Computers

■

Charging Docks and Cradles

Programmable Current Source

■

The LTC1731-4.2 is available in the 8-pin MSOP and SO

packages.

, LTC and LT are registered trademarks of Linear Technology Corporation.

TYPICAL APPLICATION

500mA Li-Ion Charger

5V TO 15V

MBRM120T3

SENSE

1µF

0.2Ω

SENSE

Si9430DY

CHRG

DRV

LTC1731-4.2

= 500mA

BAT

TIMER

BAT

PROG

TIMER

0.1µF

GND

Li-ION

CELL

PROG

10µF

19.6k

1731 TA01

*SHUTDOWN INVOKED BY FLOATING THE PROG PIN

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-

tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.

12 3 4 5 6 7 8

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