ST1S40IDR

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STMicroelectronics

3 A DC STEP-DOWN SWITCHING REGULATOR

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ST1S40IDR

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STMicroelectronics

3 A DC STEP-DOWN SWITCHING REGULATOR

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Description

General part information

ST1S40 Series

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.

Technical Specifications

Parameters and characteristics for this part

Specification	ST1S40IDR

Current - Output	3 A
Frequency - Switching	850 kHz
Function	Step-Down
Mounting Type	Surface Mount
Number of Outputs	1
Operating Temperature (Max)	150 °C
Operating Temperature (Min)	-40 °C
Output Configuration	Positive
Output Type	Adjustable
Package Length	0.154 in
Package Name	8-SOIC
Package Width	3.9 mm
Synchronous Rectifier	Yes
Topology	Buck
Voltage - Input (Max)	18 V
Voltage - Input (Min)	4 V
Voltage - Output (Max)	18 V
Voltage - Output (Min/Fixed)	0.8 V

ST1S40 Series

3 A DC step-down switching regulator

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