ST1S50 datasheet(1/29 Pages) STMICROELECTRONICS

Numer części	ST1S50

Szczegółowy opis	Solid state disk drive, Blu-ray, DVD

PDF	29 Pages

Scroll/Zoom	100%

Producent	STMICROELECTRONICS [STMicroelectronics]

Strona internetowa	http://www.st.com

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1 / 29 page

This is information on a product in full production.

March 2015

DocID025723 Rev 4

1/29

ST1S50

4 A monolithic synchronous step-down switching converter with

high efficiency at light load

Datasheet

- production data

Features

 4 A output current

 4.0 V to 18 V input voltage

 Output voltage adjustable from 0.8 V to 0.88 x

VIN

 500 kHz switching frequency

 High efficiency at light load

 Programmable soft-start and enable

 Integrated 95 m and 69 m power MOSFETs

 All ceramic capacitor

 Power Good

 Cycle-by-cycle current limiting

 Short-circuit protection

 VFDFPN10 3 x 3 x 1 mm - 10 L

Applications

 Point of load for: STB, TVs, gateway

 Solid state disk drive, Blu-ray, DVD

P/ASIC/DSP/FPGA core and I/O supplies

Description

The ST1S50 device is a 500 kHz fixed frequency

PWM synchronous step-down regulator. The

ST1S50 operates from 4.0 V to 18 V input, while it

regulates an output voltage as low as 0.8 V and

up to 0.88 x VIN.

The ST1S50 device integrates a 95 m

 high-side

switch and a 69 m

 synchronous rectifier

allowing very high efficiency with very low output

voltages.

The peak current mode control with a special

PFM mode enables high efficiency at a light load.

The ST1S50 device is available in a VFDFPN10

3 x 3 x 1 mm - 10 leads package.

Figure 1. Application circuit

VFDFPN10

VINSW

SW

FB

PG

GNDA

EN_SS

ST1S50

Css

Cout

L

R1

R2

Cinsw

R3

VOUT

VIN

GNDP

BST

Cbst

VINA

COMP

Cc

Rc

Cina

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