ZLED7010 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.

ZLED7010 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

4.4.

External Temperature Compensation of Output Current...................................................................................... 15

5

Chaining Multiple ZLED7010 ICs ................................................................................................................................ 18

6

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

7

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

8

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

8.1.

Layout Considerations for ADJI (Pin 6) ................................................................................................................ 21

8.2.

Layout Considerations for LX (Pin 8) ................................................................................................................... 21

8.3.

Layout Considerations for VIN (Pin 1) and the External Decoupling Capacitor (C1)............................................. 21

8.4.

Layout Considerations for GND (Pin 7)................................................................................................................ 21

8.5.

Layout Considerations for ADJO (Pin 5)............................................................................................................... 21

8.6.

Layout Considerations for RTH and RNTC (Pins 3 and 4)....................................................................................... 21

8.7.

Layout Considerations for High Voltage Traces................................................................................................... 21

8.8.

Layout Considerations for the External Coil (L1) ................................................................................................. 21

8.9.

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

9

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

10

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