STMicroelectronics ST1S31

Description

The ST1S31 device is an internally compensated 1.5 MHz fixed-frequency PWM synchronous step-down regulator. The ST1S31 operates from 2.8 V to 5.5 V input, while it regulates an output voltage as low as 0.8 V and up to VIN.

The ST1S31 integrates a 60 mΩ high-side switch and a 45 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 ST1S31 device is available in 3 mm x 3 mm, 8 lead VFDFPN and SO8 packages.

Features

• 3 A DC output current
• 2.8 V to 5.5 V input voltage
• Output voltage adjustable from 0.8 V
• 1.5 MHz switching frequency
• Internal soft-start and enable
• Integrated 60 mΩ and 45 mΩ power MOSFETs
• All ceramic capacitor
• Power Good (POR)
• Cycle-by-cycle current limiting
• Current foldback short-circuit protection
• VFDFPN 3 x 3 - 8L, SO8 packages

Remarks:

• Refer page num 17 for inductor series.
• Refer Page num 19 for inductor series.

Typical applications

• μP/ASIC/DSP/FPGA core and I/O supplies
• Optical storage, hard disk drive, printers,
• Point of load for: STB, TVs, DVDs

More information

• Datasheet
• IC product information