Features

➤ Fast charge of nickel cadmium

or nickel-metal hydride batteries

➤ Direct LED output displays

charge status

➤ Fast-charge termination by -∆V,

maximum voltage, maximum

temperature, and maximum

time

➤ Internal band-gap voltage reference

➤ Optional top-off charge

➤ Selectable pulse trickle charge

rates

➤ Low-power mode

➤ 8-pin 300-mil DIP or 150-mil

SOIC

General Description

The bq2002E and bq2002G FastCharge

ICs are low-cost CMOS battery-charge

controllers providing reliable

charge termination for both NiCd

and NiMH battery applications. Controlling

a current-limited or constant-current

supply allows the

bq2002E/G to be the basis for a costeffective

stand-alone or system-integrated

charger. The bq2002E/G integrates

fast charge with optional top-off

and pulsed- trickle control in a single

IC for charging one or more NiCd or

NiMH battery cells.

Fast charge is initiated on application

of the charging supply or battery replacement.

For safety, fast charge is

inhibited if the battery temperature

and voltage are outside configured

limits.

Pin Descriptions

TM Timer mode input

A three-level input that controls the settings

for the fast charge safety timer, voltage termination

mode, top-off, pulse-trickle, and

voltage hold-off time.

LED Charging output status

Open-drain output that indicates the charging

status.

BAT Battery input voltage

The battery voltage sense input. The input to

this pin is created by a high-impedance resistor

divider network connected between

the positive and negative terminals of the

battery.

VSS System ground

TS Temperature sense input

Input for an external battery temperature

monitoring thermistor.

VCC Supply voltage input

5.0V ±20% power input.

INH Charge inhibit input

When high, INH suspends the fast charge in

progress. When returned low, the IC re

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