Texas Instruments bq2031 Data Sheet User Guide

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bq2031

Lead-Acid Fast-Charge IC

Features charging until the voltage rises into

Ideal for high-efficiency

the allowed range or an internal

switch-mode power conversion

Conforms to battery manufactur- timer runs out and places the

Configurable for linear or

ers' charge recommendations for bq2031 in Fault condition. This

gated current use

cyclic and float charge procedure prevents high-current charging of cells that are possibly

Direct LED control outputs dis-

Pin-selectable charge algorithms

damaged or reversed. Charging is

play charge status and fault con-

Two-Step Voltage with inhibited anytime the temperature

ditions

temperature-compensated of the battery is outside the config- constant-voltage maintenance urable, allowed range. All voltage

General Description thresholds are temperature-

Two-Step Current with

compensated.

constant-rate pulsed current The bq2031 Lead-Acid Fast Charge maintenance IC is designed to optimize charging The bq2031 terminates fast (bulk)

of lead-acid chemistry batteries. charging based on the following:

Pulsed Current: hysteretic,

on-demand pulsed current flexible pulse-width modulation

Maximum voltage

regulator allows the bq2031 to con-

Pin-selectable charge termination trol constant-voltage, constant-

Second difference of cell voltage

by maximum voltage,∆2V, mini- current, or pulsed-current charging.

mum current, and maximum The regulator frequency is set by an time external capacitor for design flexi- Minimum current (in constant-

bility. The switch-mode design keeps voltage charging)

Pre-charge qualification detects

power dissipation to minimum for

shorted, opened, or damaged cells Maximum time-out (MTO)

high charge current applications.

and conditions battery

After bulk charging, the bq2031 pro-

charge cycle begins when power is

Charging continuously qualified by vides temperature-compensated

applied or the battery is replaced.

temperature and voltage limits maintenance (float) charging to

For safety, charging is inhibited un-

maintain battery capacity.

Internal temperature-compen- til the battery voltage is within con- sated voltage reference figured limits. If the battery voltage is less than the low-voltage threshold,

Pulse-width modulation control the bq2031 provides trickle-current

Pin Connections Pin Names

TMTO Time-out timebase input LED3/ Charge status output 3/ QSEL Charge algorithm select

FLOAT State control output input 1

TMTO LED2/DSEL

FLOAT LED1/TSEL BAT Battery voltage input COM Common LED output

BAT MOD

VCOMP Voltage loop comp input VSS System ground

VCOMP VCC

ICOMP Current loop comp input VCC 5.0V±10% power

ICOMP VSS

IGSEL Current gain select input MOD Modulation control

IGSEL COM

output

SNS LED3/QSEL SNS Sense resistor input

LED1/ Charge status output 1/

TS TPWM

TS Temperature sense input TSEL Charge algorithm select

input 2

16-Pin Narrow TPWM Regulator timebase input

DIP or SOIC LED2/ Charge status output 2/ PN203101.eps DSEL Display select input

SLUS156–JUNE 1999 E