AST1S31HF datasheet(1/33 Pages) STMICROELECTRONICS

Part #	AST1S31HF

Description	Internal soft-start and enable

PDF	33 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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1 / 33 page

This is information on a product in full production.

March 2016

DocID026968 Rev 2

1/33

AST1S31HF

Up to 4 V, 3 A step-down 2.3 MHz switching regulator for

automotive applications

Datasheet

- production data

Features

 AECQ100 qualified

 3 A DC output current

 2.8 V to 4 V input voltage

 Output voltage adjustable from 0.8 V

 2.3 MHz switching frequency

 Internal soft-start and enable

 Integrated 70 m and 55 m power MOSFETs

 All ceramic capacitor

 Power Good (POR)

 Cycle-by-cycle current limiting

 Current foldback short-circuit protection

 VFDFPN 3 x 3 - 8L package

Applications

 Designed for automotive systems

 Battery powered applications

 Car body applications

Description

The AST1S31HF is an internally compensated

2.3 MHz fixed frequency PWM synchronous step-

down regulator. The AST1S31HF operates from

2.8 V to 4 V input, while it regulates an output

voltage as low as 0.8 V and up to VIN.

The AST1S31HF device integrates a 70 m

 high-

side switch and a 55 m

 synchronous rectifier

allowing very high efficiency with very low output

voltages.

The peak current mode control with internal

compensation deliver a very compact solution

with a minimum component count.

The AST1S31HF is available in a 3 mm x 3 mm,

8-lead VFDFPN package.

Figure 1. Application circuit

VINSW

SW

VFB

PG

GND

EN

AST1S31HF

Cin_sw

Cout

L

R1

R2

VINA

Cin_a

R3

VOUT

VIN

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