'Industry's smallest' battery charger extends run-time

10th September 2014
Siobhan O'Gorman

A linear battery charger, claimed to be the industry’s smallest with the lowest power, has been introduced by Texas Instruments. The company have also introduced fully integrated DC/DC power modules. Offered in a  0.9x1.6mm WCSP, the bq25100 single-cell Li-Ion charger is half the size of existing chargers. The charger supports input voltages up to 30V, allowing accurate control of fast-charge currents as low as 10mA or as high as 250mA.

To support small Li-Ion coin batteries, the charger also allows a charge termination down to 1mA. A leakage current of less than 75nA is also supported by the bq25100, extending standby operation. By using the charger with the bq51003 2.5W, Qi-compliant wireless charging receiver, designers can add wireless charging capability to small portable and wearable applications.

Supporting 200mA output current with 95% conversion efficiency, the TPS82740A and TPS82740B step-down converter modules consume only 360nA of quiescent current during active operation and 70nA during standby. Based on 9-bump MicroSiP package, the modules incorporate a switching regulator, inductor and input/output capacitors. Measuring only 6.7mm2, TI claims the modules 75% smaller than existing modules. The TPS82740A supports output voltages from 1.8-2.5V, while the TPS82740B supports 2.6-3.3V in 100mV steps, meeting the power requirements of microcontrollers. 

Available from the TI eStore, the bq25100 is priced at $0.75 and shipped in 1,000 unit quantities. The TPS82740A and TPS82740B power modules, which are priced at $1.55 and shipped in 1,000 unit quantities, can be ordered with the TPS82740AEVM-617 and TPS82740BEVM-617 evaluation modules to simplify design. To further reduce development time, the PSpice transient module simulation software is also available to customers.

Featured products

Upcoming Events

View all events
Latest global electronics news