bq2031

The bq2031 Lead-Acid Fast Charge IC is designed to optimize charging of lead-acid chemistry batteries. A flexible pulse-width modulation regulator allows the bq2031 to control constant-voltage, constant-current, or pulsed-current charging. The regulator frequency is set by an external capacitor or design flexibility. The switch-mode design keeps power dissipation to a minimum for highchargecurrentapplications.


A charge cycle begins when power is applied or the battery is replaced. For safety, charging is inhibited until the battery voltage is within configured imits. If the battery voltage is less than the low-voltage threshold, the bq2031 provides trickle-currentcharging until the voltage rises into the allowed range or an internal timer runs out and places the bq2031 in a Fault condition. This procedure prevents high-current charging of cells that are possibly damaged or reversed. Charging is inhibited anytime the temperature of the battery is outside the configurable, allowed range. All oltage
thresholds are temperature-compensated.


The bq2031 terminates fast (bulk) chargingbasedonthefollowing:
Maximumvoltage
Seconddifferenceofcellvoltage (V)
Minimumcurrent(inconstant-voltagecharging)
Maximumtime-out(MTO)


After bulk charging, the bq2031 provides temperature-compensated maintenance (float) charging to maintainbatterycapacity.