Buck Converter IC
The new Vishay Siliconix Si9172 has an input voltage range of 2.7 V to 6 V and a dynamic adjustable output of 1.5 V to 3.6 V. When operating in PSM mode, it converts power with greater than 90% efficiency at a 170 mA load. In bypass (BP) mode, the Si9172 guarantees to deliver 800 mA with a typical 95% efficiency.
The Si9172 requires low quiescent currents of 220 μA is PSM mode and 110 μA in bypass mode, with a shutdown current of just a μA. In the PSM mode, the output voltage regulation of the Si9172 can be adjusted by an external analog voltage signal at the ADJ pin. An on-board MOSFET simplifies converter designs by reducing component count. Integration protection features include undervoltage lockout, power-on reset, soft-start and over temperature protection.