ZSPM4022-06

12V/6A Synchronous DC/DC Buck Regulator

Data Sheet

August 29, 2013

© 2013 Zentrum Mikroelektronik Dresden AG

— Rev. 1.00

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

List of Figures .......................................................................................................................................................... 5

List of Tables ........................................................................................................................................................... 5

1

IC Characteristics ............................................................................................................................................. 6

1.1.

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

1.2.

Operating Conditions ................................................................................................................................. 6

1.3.

Electrical Parameters ................................................................................................................................ 7

1.4.

Typical Characteristics .............................................................................................................................. 9

1.5.

Functional Characteristics ....................................................................................................................... 13

2

Functional Description .................................................................................................................................... 16

2.1.

Overview.................................................................................................................................................. 16

2.2.

Pin Configuration and Description ........................................................................................................... 17

2.3.

Theory of Operation................................................................................................................................. 19

2.3.1.

Continuous Mode .............................................................................................................................. 19

2.3.2.

Discontinuous Mode ......................................................................................................................... 22

2.3.3.

VDD Regulator .................................................................................................................................. 23

2.3.4.

Soft

–Start .......................................................................................................................................... 23

2.3.5.

Current Limit...................................................................................................................................... 23

2.3.6.

Power Good (PG).............................................................................................................................. 24

2.3.7.

Internal MOSFET Gate Driver........................................................................................................... 24

3

Application Information................................................................................................................................... 25

3.1.

External Component Selection ................................................................................................................ 25

3.1.1.

Inductor Selection ............................................................................................................................. 25

3.1.2.

Output Capacitor Selection ............................................................................................................... 26

3.1.3.

Input Capacitor Selection .................................................................................................................. 27

3.1.4.

Ripple Injection.................................................................................................................................. 27

3.1.5.

Setting the Output Voltage ................................................................................................................ 30

3.2.

Thermal Measurements........................................................................................................................... 32

4

Mechanical Specifications .............................................................................................................................. 33

4.1.

Package Dimensions ............................................................................................................................... 33

4.2.

Recommended Land Pattern................................................................................................................... 34

5

PCB Layout Guidelines .................................................................................................................................. 34

5.1.

ZSPM4022-06.......................................................................................................................................... 34

5.2.

Input Capacitor ........................................................................................................................................ 35

5.3.

Inductor.................................................................................................................................................... 35

5.4.

Output Capacitor ..................................................................................................................................... 35

5.5.

Optional RC Snubber .............................................................................................................................. 35

6

Ordering Information ...................................................................................................................................... 36

7

Related Documents ........................................................................................................................................ 36

8

Glossary ......................................................................................................................................................... 36

9

Document Revision History ............................................................................................................................ 37