Description
The ST1S41 is an internally compensated 850 kHz fixed-frequency PWM synchronous stepdown regulator. The ST1S41 operates from 4.0 V to 18 V input, while it regulates an output voltage as low as 0.8 V and up to VIN. The ST1S41 integrates 95 mΩ high-side switch and 69 mΩ synchronous rectifier allowing very high efficiency with very low output voltages. The peak current mode control with internal compensation delivers a very compact solution with a minimum component count. The ST1S41 is available in VFQFPN 4 mm x 4 mm 8-lead package and HSOP-8.

Features
■ 4 A output current
■ 4.0 V to 18 V input voltage
■ Output voltage adjustable from 0.8 V
■ 850 kHz switching frequency
■ Internal soft-start
■ Integrated 95 mΩ and 69 mΩ power MOSFETs
■ All ceramic capacitor
■ Enable
■ Cycle-by-cycle current limiting
■ Current foldback short-circuit protection
■ VFQFPN 4x4-8L and HSOP-8 packages

Applications
■ μP/ASIC/DSP/FPGA core and I/O supplies
■ Point of load for: STB, TVs, DVD
■ Optical storage, hard disk drive, printers, audio/graphic cards