BQ2054 Datasheet

IC型號(hào)：
BQ2054
PDF描述：
Lithium Ion Fast-Charge IC
文件大小：
150.25KB
PDF頁(yè)數(shù)：
16頁(yè)
芯片廠家：
TI

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bq2054

Lithium Ion Fast-Charge IC

Features

鉃?/div>

Safe charge of Lithium Ion bat-

tery packs

鉃?/div>

Voltage-regulated current-

limited charging

鉃?/div>

Fast charge terminated by se-

lectable minimum current; safety

backup termination on maximum

time

鉃?/div>

Charging continuously qualified

by temperature and voltage lim-

its

鉃?/div>

Pulse-width modulation control

ideal for high-efficiency switch-

mode power conversion

鉃?/div>

Direct LED control outputs dis-

play charge status and fault con-

ditions

General Description

The bq2054 Lithium Ion Fast-

Charge IC is designed to optimize

charging of lithium ion (Li-Ion)

chemistry batteries. A flexible

pulse-width modulation regulator

allows the bq2054 to control voltage

and current during charging. The

regulator frequency is set by an ex-

ternal capacitor for design flexibility.

The switch-mode design keeps

power dissipation to a minimum.

The bq2054 measures battery tem-

perature using an external thermis-

tor for charge qualification. Charging

begins when power is applied or on

battery insertion.

For safety, the bq2054 inhibits

charging until the battery voltage

and temperature are within con-

figured limits. If the battery voltage

is less than the low-voltage thresh-

old, the bq2054 provides low-current

conditioning of the battery.

A constant current-charging phase re-

plenishes up to 70% of the charge ca-

pacity, and a voltage-regulated phase

returns the battery to full. The charge

cycle terminates when the charging

current falls below a user-selectable

current limit. For safety, charging ter-

minates after maximum time and is

suspended if the temperature is out-

side the preconfigured limits.

The bq2054 provides status indica-

tions of all charger states and faults

for accurate determination of the

battery and charge system condi-

tions.

Pin Connections

Pin Names

ICTL

Time-out programming

input

Inrush current control

output

Battery voltage input

Voltage loop comp input

Current loop comp input

Minimum current

termination select input

Sense resistor input

Temperature sense input

TPWM

LED

Regulator timebase input

Charge status output 3

Common LED output

System ground

5.0V鹵 10% power

Modulation control output

Charge status output 1

Charge status output 2/

Display select input

ICTL

BAT

VCOMP

ICOMP

ITERM

SNS

LED2/DSEL

LED1

MOD

LCOM

MOD

LED

DSEL

BAT

VCOMP

VCC

VSS

LCOM

LED3

TPWM

ICOMP

TERM

SNS

16-Pin Narrow

DIP or SOIC

PN205401.eps

6/99 H

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