ST1S31 Series

3 A DC step-down switching regulator

Catalog

3 A DC step-down switching regulator

Part	Synchronous Rectifier	Operating Temperature [Max]	Operating Temperature [Min]	Current - Output	Supplier Device Package	Output Configuration	Voltage - Output (Max) [Max]	Voltage - Output (Min/Fixed)	Package / Case	Voltage - Input (Min) [Min]	Voltage - Input (Max) [Max]	Output Type	Number of Outputs	Frequency - Switching	Function	Topology	Mounting Type
STMicroelectronics ST1S31PUR		150 °C	-40 °C	3 A	8-QFN (3x3)	Positive	5.5 V	0.8 V	8-VDFN Exposed Pad	2.8 V	5.5 V	Adjustable	1	1.5 MHz	Step-Down	Buck	Surface Mount

Catalog

3 A DC step-down switching regulator

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.