3 A, 900 kHz, monolithic synchronous step-down regulator

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

Application circuit

Description

The ST1S10 is a high efficiency step-down PWM current mode switching regulator capable of providing up to 3 A of output current. The device operates with an input supply range from 2.5 V to 18 V and provides an adjustable output voltage from 0.8 V (VFB) to 0.85*VIN_SW [VOUT = VFB*(1+R1/R2)]. It operates either at a 900 kHz fixed frequency or can be synchronized to an external clock (from 400 kHz to 1.2 MHz). The high switching frequency allows the use of tiny SMD external components, while the integrated synchronous rectifier eliminates the need for a Schottky diode. The ST1S10 provides excellent transient response, and is fully protected against thermal overheating, switching over-current and output short circuit.

The ST1S10 is the ideal choice for point-of-load regulators or LDO pre-regulation.

STOCK LIST

CHONGMING GROUP (HK) INT'L CO., LTD. located in Hong Kong and Shenzhen. We are an independent Distributor of Electronic Components,established in 2008. AS a growing fast company, CM GROUP is renowned for its world-class efficiency, excellent services, and extraordinary ability to supply electronic components that are hard to find and even obsolete. We have taken pride in our innovation, reliability and service, especially in the semiconductor marketplace.
Our distribution brands include XILINX，ALTERA，ATMEL, INFINEON, ST,SAMSUNG，TEXAS INSTRUMENTS，ON，TOSHIBA，，MICROCHIP，CYPRESS，FREESCALE，etc. We distributes over 200,000 products ranging from semiconductors to resistors, capacitors, diodes, inductors, connectors, transistors, sensors and so on.
Our mission is to meet and exceed all the expecations of what we supply to customers.