ZSPM4011

High Efficiency 1A Synchronous Buck Converter

Data Sheet

September 21, 2012

© 2012 Zentrum Mikroelektronik Dresden AG

— Rev. 1.03

All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the

prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.

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Contents

1

ZSPM4011 Characteristics.................................................................................................................................. 6

1.1.

Absolute Maximum Ratings.......................................................................................................................... 6

1.2.

Thermal Characteristics................................................................................................................................ 6

1.3.

Recommended Operating Conditions .......................................................................................................... 7

1.4.

Electrical Characteristics .............................................................................................................................. 7

1.5.

Regulator Characteristics ............................................................................................................................. 8

2

Typical Performance Characteristics

– ZSPM401x Family...............................................................................10

3

Description of Circuit ......................................................................................................................................... 13

3.1.

Internal Protection Details .......................................................................................................................... 14

3.1.1.

Internal Current Limit ........................................................................................................................... 14

3.1.2.

Thermal Shutdown ............................................................................................................................... 14

3.1.3.

Reference Soft-Start ............................................................................................................................ 14

3.1.4.

Output Over-Voltage ............................................................................................................................ 14

3.1.5.

VCC Under-Voltage Lockout................................................................................................................ 14

4

Application Circuits ............................................................................................................................................ 15

4.1.

Selection of External Components ............................................................................................................. 15

4.2.

Typical Application Circuits......................................................................................................................... 15

5

Pin Configuration and Package......................................................................................................................... 16

5.1.

Marking Diagram & Pin-out ........................................................................................................................ 17

5.2.

Pin Description for 16 LEAD 3x3 QFN ....................................................................................................... 18

5.3.

Detailed Pin Description ............................................................................................................................. 19

5.3.1.

Unregulated Input, VCC (Pins # 2, 3) .................................................................................................. 19

5.3.2.

Bootstrap Control, BST (Pin #10) ........................................................................................................ 19

5.3.3.

Sense Feedback, FB (Pin #5).............................................................................................................. 19

5.3.4.

Switching Output, VSW (Pins #12, 13) ................................................................................................ 19

5.3.5.

Ground, GND (Pin #4) ......................................................................................................................... 19

5.3.6.

Power Ground, PGND (Pins #14, 15) .................................................................................................. 19

5.3.7.

Enable, High-Voltage, EN (Pin #9) ...................................................................................................... 19

5.3.8.

PG Output, PG (Pin #8) ....................................................................................................................... 19

6

Ordering Information ......................................................................................................................................... 20

7

Related Documents ........................................................................................................................................... 20

8

Glossary ............................................................................................................................................................ 20

9

Document Revision History ............................................................................................................................... 21