Application Examples (Cont.)

SC620

VIN

2

SCL

11

SDA

10

EN

3

GND

1

GND

4

GND

9

GND

12

ILED1

5

ILED2

6

ILED3

7

ILED4

8

ILED6

14

ILED8

16

ILED5

13

1μF

SCL

SDA

EN

Main Panel

LED Backlighting

Lens Focusing

Voice

Coil

ILED7

15

GPO

Digital Output Expander

Backlighting Three LEDs of Any Color Combination Plus Lens Voice Coil Drive and One GPO

Example Circuit

This application example uses the SC620 to drive 3

backlight LEDs, plus a voice coil actuator for lens auto-focus

and one open-drain digital output. Independent outputs

allow these functions to be supported simultaneously.

The VIN supply is typically single cell Li-Ion or 5.0V. VIN

and the LED anode voltage may be supplied by different

sources. The operating voltage limit of [VIN - 1.5V] at

the sink pins must be observed to achieve the specified

accuracy of the device.

13

© 2006 Semtech Corp.

www.semtech.com

POWER MANAGEMENT

SC620