Features

? Fast charge of nickel cadmium

or nickel-metal hydride batteries

? Direct LED output displays

charge status

? Fast-charge termination by

rate of rise of temperature,

maximum voltage, maximum

temperature, and maximum

time

? Internal band-gap voltage reference

? Optional top-off charge (bq2002T

only)

? Selectable pulse-trickle charge

rates (bq2002T only)

? Low-power mode

? 8-pin 300-mil DIP or 150-mil

SOIC

General Description

The bq2002D/T Fast-Charge IC are

low-cost CMOS battery-charge controllers

able to provide reliable charge termination

for both NiCd and NiMH battery

applications. Controlling a

current-limited or constant-current

supply allows the bq2002D/T to be the

basis for a cost-effective stand-alone or

system-integrated charger. The

bq2002D/T 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.

Fast charge is terminated by any of

the following:

n Rate of temperature rise

n Maximum voltage

n Maximum temperature

n Maximum time

After fast charge, the bq2002T optionally

tops-off and pulse-trickles the

battery per the pre-configured limits.

Fast charge may be inhibited using

the INH pin. The bq2002D/T may be

placed in low-standby-power mode to

reduce system power consumption.