ZLED7000 Datasheet

© 2016 Integrated Device Technology, Inc.

3

April 20, 2016

Contents

1

IC Characteristics .......................................................................................................................................................... 5

1.1

Absolute Maximum Ratings ................................................................................................................................... 5

1.2

Operating Conditions ............................................................................................................................................. 5

1.3

Electrical Parameters............................................................................................................................................. 5

1.4

Characteristic Operating Curves............................................................................................................................ 7

2

Circuit Description ......................................................................................................................................................... 9

2.1

Voltage Supply....................................................................................................................................................... 9

2.2

ZLED7000 Standby Mode...................................................................................................................................... 9

2.3

Output Current Control........................................................................................................................................... 9

2.3.1

Output Current and RS.................................................................................................................................... 9

2.3.2

PWM Control ................................................................................................................................................ 10

2.3.3

External DC Voltage Control of Output Current ............................................................................................ 10

2.3.4

Microcontroller LED Control.......................................................................................................................... 11

3

Application Circuit Design ........................................................................................................................................... 12

3.1

External Component – Inductor L1 ...................................................................................................................... 12

3.2

External Component – Capacitor C1 ................................................................................................................... 13

3.3

External Component – Diode D1 ......................................................................................................................... 13

3.4

Output Ripple....................................................................................................................................................... 14

4

Operating Conditions................................................................................................................................................... 15

4.1

Thermal Conditions.............................................................................................................................................. 15

4.2

Thermal Shut-Down Protection............................................................................................................................ 15

4.3

Open-Circuit Protection........................................................................................................................................ 15

5

ESD/Latch-Up-Protection ............................................................................................................................................ 15

6

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

7

Layout Requirements .................................................................................................................................................. 17

7.1

Layout Considerations for ADJ (Pin 3)................................................................................................................. 17

7.2

Layout Considerations for LX (Pin 1) ................................................................................................................... 17

7.3

Layout Considerations for VIN (Pin 5) and the External Decoupling Capacitor (C1)............................................. 17

7.4

Layout Considerations for GND (Pin 2)................................................................................................................ 17

7.5

Layout Considerations for High Voltage Traces................................................................................................... 17

7.6

Layout Considerations for the External Coil (L1) ................................................................................................. 17

7.7

Layout Considerations for the External Current Sense Resistor (RS) .................................................................. 17

8

Ordering Information ................................................................................................................................................... 17

9

Document Revision History ......................................................................................................................................... 18