ZLED7015

1.0MHz Boost Converter with Internal 35V Switch

Data Sheet

December 20, 2011

© 2011 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

1

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

1.1

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

1.2

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

1.3

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

1.4

Typical Operating Characteristics .......................................................................................................................... 8

1.5

Characteristic Waveforms.................................................................................................................................... 10

2

Circuit Description ....................................................................................................................................................... 12

2.1

EN Pin, VP Pin, and Soft-Start Function .............................................................................................................. 12

2.2

Output Current Control......................................................................................................................................... 12

2.2.1

Output Current and RS.................................................................................................................................. 12

2.2.2

Dimming via External DC Voltage Control .................................................................................................... 13

2.2.3

Dimming via PWM Control............................................................................................................................ 14

2.2.4

Microcontroller LED Control.......................................................................................................................... 15

2.2.5

Constant Voltage Application........................................................................................................................ 15

3

Application Circuit Design ........................................................................................................................................... 17

3.1

External Component

– RS .................................................................................................................................... 17

3.2

External Component

– Inductor L1....................................................................................................................... 17

3.3

External Components

– Input Decoupling Capacitors C1 and CIN........................................................................ 17

3.4

External Component

–Output Capacitors C2 and COUT........................................................................................ 17

3.5

External Component

– Diode D1.......................................................................................................................... 17

3.6

Additional External Components.......................................................................................................................... 17

4

Operating Conditions................................................................................................................................................... 18

4.1

Under-Voltage Lockout ........................................................................................................................................ 18

4.2

Over-Voltage Threshold and Open-Circuit Protection.......................................................................................... 18

4.3

Over-Temperature Protection .............................................................................................................................. 18

5

ESD/Latch-Up-Protection ............................................................................................................................................ 19

6

Pin Configuration and Package ................................................................................................................................... 19

7

Layout Requirements .................................................................................................................................................. 21

7.1

General Considerations and Ground Traces ....................................................................................................... 21

7.2

Layout Considerations for C1, CIN, C2 and COUT................................................................................................... 21

7.3

Layout Considerations for the EN Pin .................................................................................................................. 21

7.4

Layout Considerations for the LX Pin, L1 External Coil, and D1 Diode................................................................. 21

7.5

Layout Considerations for the External Current Sense Resistor (RS) .................................................................. 21

7.6

Layout Considerations for CVP and CVDD.............................................................................................................. 21

7.7

Layout Considerations for the Thermal Pad......................................................................................................... 21

8

Glossary of Terms ....................................................................................................................................................... 22

9

Ordering Information ................................................................................................................................................... 22

10

Document Revision History ......................................................................................................................................... 22