STMicroelectronics ST1S10PHR

Description

The ST1S10 is a high efficiency step-down PWM current mode switching regulator with an output current of up to 3 A. The device has an input voltage range of 2.5 V to 18 V and an adjustable output voltage of 0.8 V (VFB) to 0.85*VIN SW [VOUT = VFB*(1+R1/R2)]. It works at a fixed frequency of 900 kHz or can be synchronized to an external clock (from 400 kHz to 1.2 MHz). Because of the high switching frequency, tiny SMD external components can be used, and the inbuilt synchronous rectifier avoids the requirement for a Schottky diode. The ST1S10 has a high transient response and is fully protected against thermal overheating, switching overcurrent, and output short circuit.

The ST1S10 is an excellent solution for LDO pre-regulation or point-of-load regulators.

Features

■ Step-down current mode PWM regulator
■ Output voltage adjustable from 0.8 V
■ Input voltage from 2.5 V up to 18 V
■ 2% DC output voltage tolerance
■ Synchronous rectification
■ Inhibit function
■ Synchronizable switching frequency from 400 kHz up to 1.2 MHz
■ Internal soft start
■ Dynamic short circuit protection
■ Typical efficiency: 90%
■ 3 A output current capability
■ Stand-by supply current: max 6 µA over temperature range
■ Operative junction temp: from -25°C to 125°C

Applications

■ Consumer
– STB, DVD, DVD recorders, TV, VCR, car audio, LCD monitors
■ Networking
– XDSL, modems, DC-DC modules
■ Computer
– Optical storage, HD drivers, printers, audio/graphic cards
■ Industrial and security
– Battery chargers, DC-DC converters, PLD, PLA, FPGA, LED drivers