LT1239CS

更新时间： 2024-02-16 07:16:04

品牌	Logo	应用领域
凌特 - Linear		电池
页数	文件大小	规格书
12页	249K
描述
Backup Battery Management Circuit

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中文翻译

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LT1239CS 数据手册

LT1239

Backup Battery

Management Circuit

FEATURES

DESCRIPTION

The LT^®1239 is a micropower backup battery manage-

ment system for portable computers and instrumenta-

tion. It contains two regulators for regulating the battery

voltage and memory voltage and a comparator for switch-

ing between main power and backup power. The first

regulator provides a constant voltage charge for the

backup batteries and is adjustable from 3.75V up to 20V.

An equalization amplifier combined with the first regulator

provides precision charge equalization for a 2-cell

lithium-ion system. A second regulator with 4.85V output

providesaregulatedbackupbatteryvoltagetothememory

when main power is lost. The second regulator also

isolates the backup battery from the main 5V supply

during normal operation when the memory is being pow-

ered by the 5V supply.

■

Micropower Operation (I_Q= 20

µA)

■

Adjustable Regulator for Battery Charging

4.85V Regulator for Battery Regulation

Cell Voltage Equalization in 2-Cell Systems

Low-Battery Detector Protects Lithium Cells

Comparator for Automatic Power Switching

Shutdown

■

Output Current Sensing

Current and Thermal Limiting

Reverse Output Protection

16-Pin SO Package

Operates on 7V to 30V Input

APPLICATIONS

■

Backup Battery Management Systems for Portable

A comparator is included which provides automatic

switchover from main 5V power to backup power ensur-

ing uninterrupted power for memory and power monitor-

Computers

■

Lithium-Ion Backup Systems

NiCd Backup Systems

■

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

TYPICAL APPLICATION

Lithium-Ion Backup System

120Ω* 120Ω*

INPUT 2

OUT 1

ADJ

604k

300pF

22µF

INPUT 1

REGULATOR

MAIN

BATTERY

PACK

22µF

69.8k

MON1

SHDN1

7V TO 24V

3.4V

Li-Ion

CELL

E/A (IN)

681k

INPUT 2

–

GND

LOW-BATTERY

DETECT

E/A (OUT)

3.4V

Li-Ion

CELL

GND

5V SYSTEM

POWER

INPUT 1

–

OUT

GND

REGULATOR

OUT 2

SHDN2

REQUIRED BY SOME SAFETY AGENCIES

SEE APPLICATIONS INFORMATION

FOR INFORMATION ON

MON2

POWER

MANAGEMENT

MEMORY

SELECTING VALUES.

LTC1239 • TA01

12 3 4 5 6 7...12

中文翻译

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与LT1239CS相关器件

型号	品牌	获取价格	描述	数据表
LT1239CS#TR	Linear	获取价格	IC 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16, 0.150 INCH, PLASTIC, SOP-16, Power Manageme
LT123A	Linear	获取价格	5 Volt, 3 Amp Voltage Regulator
LT123AK	Linear	获取价格	5 Volt, 3 Amp Voltage Regulator
LT123AK/883	Linear	获取价格	IC VREG 5 V FIXED POSITIVE REGULATOR, MBFM2, METAL CAN, TO-3, 2 PIN, Fixed Positive Single
LT123AK883	Linear	获取价格	IC VREG 5 V FIXED POSITIVE REGULATOR, MBFM2, METAL CAN, TO-3, 2 PIN, Fixed Positive Single
LT123K	Linear	获取价格	5 Volt, 3 Amp Voltage Regulator
LT123K/883	Linear	获取价格	IC,VOLT REGULATOR,FIXED,+5V,BIPOLAR,TO-204/-3,3PIN,METAL
LT1240-7	BEL	获取价格	AC-DC Regulated Power Supply Module, 1 Output, 400W, CASE T01, MODULE
LT1240-7D	BEL	获取价格	AC-DC Regulated Power Supply Module, 1 Output, 400W, CASE T01, MODULE
LT1240-7DB1	BEL	获取价格	AC-DC Regulated Power Supply Module, 1 Output, 400W, CASE T01, MODULE

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