ST1S10PHR integrated semiconductor 3 A, 900 kHz, monolithic synchronous step-down regulator

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.

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