ST1S40IDR Description

An internally adjusted 850 kHz fixed-frequency PWM synchronous stepdown regulator is the ST1S40 device. The ST1S40 controls an output voltage as low as 0.8 V and as high as VIN while operating with an input range of 4.0 V to 18 V.

The ST1S40 incorporates a 69 m synchronous rectifier with a 95 m high side switch, enabling extremely high efficiency at very low output voltages.

A very small solution with a low component count is delivered by the peak current mode control with internal compensation. The ST1S40 comes in three different packages: HSOP-8, VFQFPN 4 mm x 4 mm - 8 lead, and conventional SO8.

ST1S40IDR Features

• 3 A DC 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 m? and 69 m? Power MOSFETs

• All ceramic capacitor

• Enable

• Cycle-by-cycle current limiting

• Current fold back short-circuit protection

• Available in HSOP-8, VFQFPN4x4-8L, and SO8 packages

ST1S40IDR Applications

• P/ASIC/DSP/FPGA core and I/O supplies

• Point of load for: STB, TVs, DVD

• Optical storage, hard disk drive, printers, audio/graphic cards