Featu res➤ Conforms to battery manufactur-ers' charge recommendations forcyclic and float charge➤ Pin-selectable charge algorithms-Two-Step Voltage withtemperature-compensatedconstant-voltage maintenance-Two-Step Current withconstant-rate pulsed currentmaintenance-Pulsed Current: hysteretic,on-demand pulsed current➤ Pin-selectable charge terminationby maximum voltage,∆2V, mini-mum current, and maximumtime➤ Pre-charge qualification detectsshorted,opened, or damaged cellsand conditionsbattery➤ Charging continuously qualified bytemperature and voltage limits➤ Internal temperature-compen-satedvoltagereference➤ Pulse-widthmodulationcontrol-Ideal for high-efficiencyswitch-mode power conversion-Configurablefor linear orgated current use➤ Direct LED control outputs dis-play charge status and fault con-ditionsGeneral DescriptionThe bq2031 Lead-Acid Fast ChargeIC is designed to optimize chargingof lead-acid chemistry batteries. Aflexible pulse-width modulationregulatorallowsthe bq2031to con-trol constant-voltage, constant-current,or pulsed-currentcharging.The regulator frequency is set by anexternal capacitor for design flexi-bility. The switch-mode design keepspower dissipation to a minimum forhigh charge current applications.A charge cycle begins when power isapplied or the battery is replaced.For safety, charging is inhibited un-til the battery voltage is within con-figured limits. If the battery voltage isless than the low-voltage threshold,the bq2031 provides trickle-currentcharging until the voltage rises intothe allowed range or an internaltimer runs out and places thebq2031 in a Fault condition. Thisprocedure prevents high-currentcharging of cells that are possiblydamaged or reversed. Charging isinhibited anytime the temperatureof the battery is outside the config-urable,...
