BQ2902PN Datasheet

IC型號：
BQ2902PN
PDF描述：
Rechargeable Alkaline Charge/Discharge Controller IC
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125.37KB
PDF頁數(shù)：
12頁
芯片廠家：
TI

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bq2902

Rechargeable Alkaline Charge/Discharge

Controller IC

Features

鉃?/div>

Safely charges two rechargeable

alkaline batteries such as Re-

newal

廬

from Rayovac

廬

鉃?/div>

Terminates pulsed charge with

maximum voltage limit

鉃?/div>

Contains LED charge status out-

put

鉃?/div>

Features a pin-selectable

low-battery cut-off

鉃?/div>

Pre-charge qualification indicates

fault condition

鉃?/div>

Available in 8-pin 300-mil DIP or

150-mil SOIC

General Description

The bq2902 is a low-cost charger for

rechargeable alkaline batteries such

as Renewal

廬

batteries from Rayovac

廬

The bq2902 combines sensitive, full-

charge detection for two recharge-

able alkaline cells, with a low-battery

cut-off for overdischarge protection.

Designed for system integration

into a two-cell system, the bq2902

can improve the service life of the

rechargeable alkaline cells by prop-

erly managing the charge and dis-

charge. The bq2902 requires a

voltage limited current source to

generate the proper charge pulses

for the Renewal

廬

cell. Each cell is

individually monitored to ensure

full charge without a damaging

overcharge.

Charge completion is indicated

when the average charge rate falls

below approximately 3% of the fast

charge rate. A status output is pro-

vided to indicate charge in progress,

charge complete, or fault indication.

The bq2902 avoids over-depleting

the battery by using the internal

end-of-discharge control circuit.

The bq2902 also eliminates the

external power switching transis-

tors needed to separately charge

individual Renewal cells.

For safety, charging is inhibited if

the per-cell voltage is greater than

3.0V during charge (closed-circuit

voltage), or if the cell voltage is less

than 0.4V (open-circuit voltage).

Pin Connections

Pin Names

CHG

BAT

Charging supply input

Battery status output

LRTN

Battery 1 positive input

SEL

BAT

Battery 1 negative input

End-of-discharge voltage

select input

System load return

Battery 2 negative input

IC ground

VSEL

BAT1N

BAT1P

CHG

VSS

LRTN

8-Pin Narrow DIP

or SOIC

PN290201.eps

5/99 C

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描述

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