New Product Introduction

STMicroelectronics ST1S40 3A DC stepdown switching regulator

The ST1S40 integrates a 95 mΩ high side switch and 69 mΩ synchronous rectifier allowing very high efficiency with very low output voltages.

STMicroelectronics	ST1S40 product image

The ST1S40 device is an internally compensated 850 kHz fixed-frequency PWM synchronous step-down regulator. The ST1S40 operates from 4.0 V to 18 V input, while it regulates an output voltage as low as 0.8 V and up to VIN.The ST1S40 integrates a 95 mΩ high side switch and 69 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. It is available in HSOP-8, VFQFPN 4 mm x 4 mm - 8 lead, and standard SO8 package.

 

Key features

  • 3 A DC output current
  • 4.0 V to 18 V input voltage
  • Integrated 95 mΩ and 69 mΩ Power MOSFETs
  • Current fold back short-circuit protection

 

Additional 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 mΩ and 69 mΩ 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

 

Applications

  • Industrial power supplies
  • P/ASIC/DSP/FPGA core and I/O supplies
  • Point of load for: STB, TVs, DVD
  • Optical storage, HD drive, printers, audio/graphic cards

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