Ultra-low power solution for products powered by one-cell, two-cell alkaline, NiCd, NiMH and more

The Texas Instruments’ TPS61098x is an ultra-low power solution for products powered by either a one-cell or two-cell alkaline, NiCd or NiMH, one-cell coin cell or one-cell Li-Ion or Li-polymer battery. It integrates either a low-dropout linear regulator or a load switch with a boost converter and provides two output rails. The boost output is designed as an always-on supply for a main system, and the LDO or load switch output is to power peripheral devices. The device has two modes controlled by MODE pin: Active mode and low power mode. In active mode, both outputs are enabled with enhanced response performance. In low power mode, the LDO or load switch is disabled to disconnect peripherals. The device consumes only 300nA quiescent current and can achieve up to 88% efficiency at 10µA load in Low Power mode. It supports automatic pass-through function. When input voltage is higher than a pass-through threshold, the boost converter stops switching and passes the input voltage to VMAIN rail; when input voltage is lower than the threshold, the boost works in boost mode and regulates output at the target value. The device provides different versions for different output set values. It can provide up to 50mA total output current at 0.7V input to 3.3V output conversion. The boost is based on a hysteretic controller topology using synchronous rectifier to obtain maximum efficiency at minimal quiescent current. The device is available in 1.5mm × 1.5mm WSON package to enable small circuit layout size.