1. The STMicroelectronics ST1PS01 delivers up to 400 mA from a 1.14- × 1.41-mm flip-chip package, with quiescent current of just 500 nA and four digitally selectable output voltages that can be switched dynamically.
Key applications include asset tracking, gas/water energy meters, and long-term portable medical monitoring, to cite a few among many others. The IC, complete with integrated power switch, synchronous rectifier, and integrated compensation network, has an input-voltage range between 1.8 and 5.5 V (the 1.8-V minimum supply-input voltage allows use of various battery chemistries including a single lithium-based cell). Maximum delivered output current is 400 mA.
Typical efficiency is 94% at 1 mA load with VIN at 3.6 V and VOUT at 3.3 V (Fig. 2), while output voltage accuracy measures ±2%. When in use, the IC requires just a small inductor, two same-value capacitors, and a resistor (typically 2.2 µH, 10 µF, and 1 MΩ, respectively).