ST1S40 Series

3 A DC step-down switching regulator

Catalog

3 A DC step-down switching regulator

Part	Voltage - Input (Max) [Max]	Package / Case	Output Type	Supplier Device Package	Number of Outputs	Voltage - Output (Max) [Max]	Voltage - Input (Min) [Min]	Frequency - Switching	Output Configuration	Topology	Current - Output	Mounting Type	Voltage - Output (Min/Fixed)	Function	Operating Temperature [Min]	Operating Temperature [Max]	Package / Case	Package / Case	Package / Case [y]	Package / Case [x]
STMicroelectronics ST1S40IPUR	18 V	8-VDFN Exposed Pad	Adjustable	8-VFQFPN (4x4)	1	18 V	4 V	850 kHz	Positive	Buck	3 A	Surface Mount	0.8 V	Step-Down	-40 °C	150 °C
STMicroelectronics ST1S40IDR	18 V	8-SOIC	Adjustable	8-SOIC	1	18 V	4 V	850 kHz	Positive	Buck	3 A	Surface Mount	0.8 V	Step-Down	-40 °C	150 °C	0.154 in	3.9 mm
STMicroelectronics ST1S40IPHR	18 V	8-SOIC Exposed Pad	Adjustable	8-HSOP	1	18 V	4 V	850 kHz	Positive	Buck	3 A	Surface Mount	0.8 V	Step-Down	-40 °C	150 °C			3.9 mm	0.154 in

Catalog

3 A DC step-down switching regulator

Description

The ST1S40 is an internally compensated 850 kHz fixed-frequency PWM synchronous step-down regulator. 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. The ST1S40 is available in VFQFPN 4 mm x 4 mm 8 lead package, HSOP-8 and standard SO-8 package.