ST1S41 datasheet(1/27 Pages) STMICROELECTRONICS

部件名	ST1S41

功能描述	850 kHz switching frequency

PDF	27 Pages

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制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

标志

1 / 27 page

This is information on a product in full production.

April 2013

DocID023654 Rev 2

1/27

27

ST1S41

4 A step-down switching regulator

Datasheet

- production data

Features

• 4 A 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 foldback short-circuit protection

• VFQFPN 4x4-8L and HSOP-8 packages

Applications

•μP/ASIC/DSP/FPGA core and I/O supplies

• Point of load for: STB, TVs, DVD

• Optical storage, hard disk drive, printers,

audio/graphic cards

Description

The ST1S41 is an internally compensated 850

kHz fixed-frequency PWM synchronous step-

down regulator. The ST1S41 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 ST1S41 integrates 95 m

Ω high-side switch

and 69 m

Ω 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 ST1S41 is available in VFQFPN 4 mm x 4

mm 8-lead package and HSOP-8.

Figure 1. Application circuit

VFQFPN8 4x4

HSOP8

VINSW

SW

FB

PGND

EN

ST1S41

Cin_sw

Cout

L

R1

R2

VINA

Cin_a

VOUT

VIN

ePAD/GND

1

4

8

2

3

6

7

9

AM15058v1

www.st.com

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