STEVAL-ISA055V2 STMicroelectronics, STEVAL-ISA055V2 Datasheet

STEVAL-ISA055V2

Manufacturer Part Number

STEVAL-ISA055V2

Description

BOARD EVAL BASED ON ST1S12

Manufacturer

STMicroelectronics

Type

DC/DC Switching Converters, Regulators & Controllersr

Datasheets

1.ST1S12G18R.pdf (20 pages)

2.STEVAL-ISA055V2.pdf (4 pages)

Specifications of STEVAL-ISA055V2

Mfg Application Notes

ST1S12 AppNote

Main Purpose

DC/DC, Step Down

Outputs And Type

1, Non-Isolated

Voltage - Output

3.3V

Current - Output

700mA

Voltage - Input

2.5 ~ 5.5V

Regulator Topology

Buck

Frequency - Switching

1.7MHz

Board Type

Fully Populated

Utilized Ic / Part

ST1S12

Input Voltage

2.5 V to 5.5 V

Output Voltage

3.3 V

Product

Power Management Modules

Silicon Manufacturer

ST Micro

Silicon Core Number

ST1S12XX

Kit Application Type

Power Management - Voltage Regulator

Application Sub Type

Synchronous Buck Converter

Kit Contents

Board

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Power - Output

Lead Free Status / Rohs Status

Lead free / RoHS Compliant

For Use With/related Products

ST1S12x

Other names

497-8220

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Features

■

Description

This demonstration board is based on the

ST1S12 family of synchronous step-down DC-DC

converters optimized for powering low-voltage

digital cores in HDD (hard disk drive) applications,

and is generally used to replace high-current

linear solutions when power dissipation may

cause high heating of the application

environment.

It provides up to 0.7 A over an input voltage range

of 2.5 V to 5.5 V. A high switching frequency of 1.7

MHz allows the use of tiny surface-mount

components. A resistor divider to set the output

voltage value, an inductor, and two capacitors are

required for the adjustable version, while only an

inductor and 2 capacitors are needed for the 1.2 V

and 1.8 V fixed version.

A low output ripple is guaranteed by the current

mode PWM topology and by the use of low ESR

surface-mount ceramic capacitors.

September 2008

For further information contact your local STMicroelectronics sales office.

Step-down current mode PWM (1.7 MHz) DC-

DC converter

Fixed output voltage 3.3 V

0.7 A output current capability

3% DC output voltage tolerance

Synchronous rectification

Enable function

Internal soft-start

Typical efficiency: > 90%

Non switching quiescent current: max 600 µA

over temperature range

Uses tiny capacitors and inductors

DS(on)

typ. 250 mΩ and 400 mΩ

with enable function based on the ST1S12XX

0.7 A / 3.3 V synchronous buck converter

Rev 1

The ST1S12 device is thermal protected and

current limited to prevent damage due to

accidental short-circuit. This family of products is

available in the TSOT23-5L package.

STEVAL-ISA055V2

Data Brief

www.st.com

1/4

Related parts for STEVAL-ISA055V2

STEVAL-ISA055V2 Summary of contents

Page 1

... For further information contact your local STMicroelectronics sales office. 0 3.3 V synchronous buck converter with enable function based on the ST1S12XX The ST1S12 device is thermal protected and current limited to prevent damage due to accidental short-circuit. This family of products is available in the TSOT23-5L package. Rev 1 STEVAL-ISA055V2 STEVAL-ISA055V2 Data Brief 1/4 www.st.com 4 ...

Page 2

... Schematic diagram 1 Schematic diagram Figure 1. ST1S12 circuit schematic diagram 2 ST1S12 1 EN GND 2 STEVAL-ISA055V2 GND V OUT C OUT AM00303 ...

Page 3

... STEVAL-ISA055V2 2 Revision history Table 1. Document revision history Date 18-Sep-2008 Revision 1 Initial release. Revision history Changes 3/4 ...

Page 4

... Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America 4/4 Please Read Carefully: © 2008 STMicroelectronics - All rights reserved STMicroelectronics group of companies www.st.com STEVAL-ISA055V2 ...

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