Delivering power management innovation for ultra-low power designs, Texas Instruments (TI) has introduced what it claims in the industry’s smallest, lowest power linear battery charger and a tiny, fully integrated DC/DC power module, which consumes only 360 nA of quiescent current, to help extend battery run-time in wearable electronics, remote sensors and MSP430 microcontroller-based applications.
The bq25100 single-cell Li-Ion charger comes in a 0.9-mm by 1.6-mm WCSP package, and achieves a solution half the size of existing charger solutions. The device supports input voltages up to 30 V, and allows accurate control of fast-charge currents as low as 10 mA or as high as 250 mA, and precise charge termination down to 1 mA to support tiny Li-Ion coin batteries. It can also support a leakage current of less than 75 nA to extend standby operation.
Designers also can add wireless charging capability to small portable and wearable applications by pairing the bq51003 2.5-W, Qi-compliant wireless charging receiver with the bq25100 linear charger on the same board. Both devices are featured on a new TI Design reference board that measures 75 mm2.
TI’s new TPS82740A and TPS82740B step-down converter modules support 200-mA output current with 95 percent conversion efficiency and consume only 360 nA of quiescent current during active operation and 70 nA during standby. The tiny modules rely on a fully integrated, 9-bump MicroSiP package, which incorporates a switching regulator, inductor and input/output capacitors to achieve a solution size of only 6.7 mm2.
The TPS82740A supports output voltages from 1.8 V to 2.5 V, while the TPS82740B supports 2.6 V to 3.3 V in 100-mV steps, which can meet power requirements of microcontrollers, such as TI’s new ultra-low power MSP430FR59xx microcontrollers (MCUs), and Bluetooth® low energy solutions, such as the SimpleLink CC2540T wireless MCU.