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SC620_07 Datasheet, PDF (1/18 Pages) Semtech Corporation – Octal LED Driver, General Purpose Current Sink with Serial Interface | |||
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SC620
Octal LED Driver, General Purpose
Current Sink with Serial Interface
POWER MANAGEMENT
Features
 Wide current setting range â 31.25μA to 25mA
 Eight identical current drivers with independent
control
 5% current matching, 7% accuracy
 I2C interface for microprocessor control
 I2C slave address 1110 000x
 Less than 1μA quiescent current in shutdown
 Low dropout voltage â ⤠150mV
 Over-temperature protection
 MLPQ-UT-16 package (3mm x 3mm)
 Ultra-thin 0.6mm maximum package height
 Fully WEEE and RoHS compliant
Applications
 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
Description
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 LEDâs 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.
The SC620 also employs an adjustable global current gain
setting register to allow the current setting step size to
vary from 31.25μA to 500μA. This provides 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 float-
ing cathode technology. This feature allows each output
pin to vary in voltage from 150mV to V - 1.5V.
IN
All current control is programmed using an I2C interface
bus. Only a single input bypass capacitor is required â no
other external 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-con-
scious backlighting designs.
Typical Application Circuit
Battery
1μF
SCL
SDA
EN
SC620
IN
ILED1
SCL
ILED2
SDA
ILED3
EN
ILED4
GND
ILED5
GND
ILED6
GND
ILED7
GND
ILED8
LED Backlighting
Main Panel
Sub Panel Color/R/G/B LEDs
December 19, 2007
© 2007 Semtech Corporation
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