Description

January 16, 2007

Typical Application Circuit

The SC620 is a multi-purpose LED driver with eight identi-

cal, independently controlled current sinks. Each current

sink can drive an LED by connecting the LED’s anode to

the system power supply and the cathode to the current

sink input pin. Any combination of outputs can be enabled

or disabled for optimal design flexibility.

In addition to the individual current settings, the SC620

employs an adjustable global current gain setting register

to allow the current setting step size to vary from 31.25μA

to 500μA, giving the designer a wide range of options for

LED variation and dimming functions. The maximum output

is also scaled by this step size, with a maximum of 25mA

at the highest step setting.

Multi-colored and white LEDs with different forward volt-

ages can be driven using the same SC620 due to its floating

cathode technology. This feature allows each output pin to

vary in voltage from 150mV to V

single input bypass capacitor is required - no other exter-

nal resistors or capacitors are needed. The 3mm x 3mm

MLPQ package and minimal support components make

the SC620 an ideal solution for low-cost, area-conscious

backlighting designs.

Eight identical current drivers with independent

control

Wide current setting range - 31.25μA to 25mA

3% current matching, 5% accuracy

Less than 1μA quiescent current in shutdown

Low dropout voltage: ≤ 150mV

Over-temperature protection

MLPQ-UT-16 package (3mm x 3mm)

Ultra-thin 0.6mm maximum package height

Fully WEEE and RoHS compliant

LCD backlighting LED driver

Multicolor and RGB LED driver

General purpose current sink array

General purpose digital output (open-drain) expander

Auto-focus voice-coil driver

Features

Applications

Battery

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

ILED7

15

ILED8

16

ILED5

13

Sub Panel

Color/R/G/B LEDs

1μF

SCL

SDA

EN

Main Panel

LED Backlighting

www.semtech.com

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POWER MANAGEMENT

SC620

Octal LED Driver, General Purpose

Current Sink with Serial Interface