5A, controlled rapid charging for lithium ion cells

May 05, 2015 // By Graham Prophet
Texas Instruments’ MaxCharge technology can cut battery-charge time by 60%; the single-cell Li-ion 5-A battery-charger IC can achieve 80% capacity in 30 minutes

Enabling faster and cooler charging, Texas Instruments claims a first for its fully integrated 5-A single-cell lithium-ion (Li-ion) battery-charger circuit with proprietary MaxCharge technology that reduces charge time up to 60% compared to existing battery chargers. The bq25892 switch-mode charger gives users safer charging with a faster charge time.

The highly efficient charger, which charges at 3.5A with 18C temperature rise, combines narrow-voltage DC/DC power path management with TI's MaxCharge technology to support input voltages up to 14V while providing charge current up to 5A. This is, TI adds the first single-cell Li-ion battery charger to support 5A of current and input voltages up to 14V. The device provides up to 91% charging efficiency at 9 Vin & 3.5A with only an 18C temperature rise.

Safer charging results with reduced heat from controlling the integrated circuit temperature and optimising thermal performance with a thermal-regulation loop. The charger can provide peak 9A supplement current for an instant system-power burst. For simple design integration, the device is pin-to-pin compatibility with TI's bq24192 product family.

This fast-charging battery charger is designed to work in single-cell portable devices with TI battery fuel gauges. For example, pair a TI MaxCharge technology device with TI MaxLife battery fuel gauge technology to ensure longer battery life and safer charging of portable electronics.

The I ²C-controlled 1S, 5-A fast charger is featured in a new TI Designs reference design, TIDA-00538, using MaxCharge technology for high input voltage and adjustable USB OTG boost, which enables turn-key access to reduce battery-charging time and improve battery run time during the discharging phase.

The bq25892 charger is in a 4 x 4-mm, 24-pin quad flat no-lead (QFN) package. The bq25890 and bq25892, for smartphones and tablets, is priced at $2.50 (1000). TI also has the bq25895, which supports power banks and is priced at $2.00.

Texas Instruments; www.ti.com