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LTC1980

更新时间： 2024-09-23 22:55:51

品牌	Logo	应用领域
凌特 - Linear		转换器电池
页数	文件大小	规格书
16页	456K
描述
Combination Battery Charger and DC/DC Converter

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LTC1980 数据手册

Final Electrical Specifications

LTC1980

Combination Battery

Charger and DC/DC Converter

May 2003

DESCRIPTIO

FEATURES

The LTC^®1980 integrates PWM power control for charg-

ing a battery and converting the battery voltage to a

regulated output or simultaneously charging the battery

while powering system load from an unregulated AC wall

adapter. Combining these features into a single IC pro-

duces a smaller area and lower cost solution compared to

■

Single Controller IC Includes Battery Charger

Plus DC/DC Converter

■

Wall Adapter Voltage May be Above or Below

Battery Voltage

■

LDO Controller Allows Simultaneous Charging

and Regulating from Wall Adapter Input

■

Standalone Li-Ion Battery Charger Including Charge

Termination, Overvoltage Protection, Shorted-Cell

Detection and Battery Recharge

presentlyavailablemulti-ICsolutions.TheLTC1980shares

the discrete components for both the battery charger and

theDC/DCconverterthusminimizingsizeandcostrelative

to dual controller solutions. Both the battery charger and

DC/DC converter use a current mode flyback topology for

high efficiency and excellent transient response. Optional

BurstModeoperationandpower-downmodeallowpower

density, efficiency and output ripple to be tailored to the

application.

■

Selectable 4.1V, 4.2V, 8.2V and 8.4V Float Voltages

Simple NiMH and NiCd Battery Charger

Pin Programmable Regulator Burst Mode^®Operation

and Shutdown for High Efficiency

High Efficiency Current Mode 300kHz PWM

Reduced Component Architecture

Undervoltage Protection and Soft-Start Insures

Start-Up with Current Limited Wall Adapter

Small 24-Pin SSOP Package

■

The LTC1980 provides a complete Li-Ion battery charger

with charge termination timer, preset Li-Ion battery volt-

ages, overvoltage and undervoltage protection, and user-

programmableconstant-currentcharging.Automaticbat-

tery recharging, shorted-cell detection, and open-drain

C/10 and wall plug detect outputs are also provided. User

programming allows NiMH and NiCd battery chemistries

to be charged as well.

■

APPLICATIO S

■

Digital Cameras

■

Handheld Computers

■

Personal Digital Assistants

1W to 10W Uninterruptable Power Supplies

■

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

Burst Mode is a registered trademark of Linear Technology Corporation.

TYPICAL APPLICATIO

Li-Ion Charger and DC/DC Converter Using One IC

3.3V Regulator Efficiency vs Load Current

POWER FLOW

CHARGING

BATTERY

OPERATION

UNREGULATED

WALL ADAPTER

Li-Ion

BATTERY

•

INPUT (3V TO 10V)

SYSTEM

POWER

BAT-FET

REG-FET

•

LDO/

SWITCH

FIGURE 5

= 3.6V

3.3V

1.8V

1.5V

BAT

= 25°C

SYSTEM LOAD

DC/DC

CONVERTERS

100

1000

LTC1980

LOAD CURRENT (mA)

1980 TA01

1980 G04

1980i

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...16

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与LTC1980相关器件

型号	品牌	获取价格	描述	数据表
LTC1980_1	Linear	获取价格	Combination Battery Charger and DC/DC Converter
LTC1980EGN	Linear	获取价格	Combination Battery Charger and DC/DC Converter
LTC1980EGN#PBF	Linear	获取价格	LTC1980 - Combination Battery Charger and DC/DC Converter; Package: SSOP; Pins: 24; Temper
LTC1980EGN#TRPBF	Linear	获取价格	LTC1980 - Combination Battery Charger and DC/DC Converter; Package: SSOP; Pins: 24; Temper
LTC1981	Linear	获取价格	Single and Dual Micropower High Side Switch Controllers in SOT-23
LTC1981	ADI	获取价格	采用 SOT-23 封装的单通道和双通道微功率高端开关控制器
LTC1981_15	Linear	获取价格	Single and Dual Micropower High Side Switch Controllers in SOT-23
LTC1981ES5	Linear	获取价格	Single and Dual Micropower High Side Switch Controllers in SOT-23
LTC1981ES5#PBF	Linear	获取价格	LTC1981 - Single and Dual Micropower High Side Switch Controllers in SOT-23; Package: SOT;
LTC1981ES5#TR	Linear	获取价格	LTC1981 - Single and Dual Micropower High Side Switch Controllers in SOT-23; Package: SOT;

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