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SC620
Octal LED Driver, General Purpose
Current Sink with Serial Interface
POWER MANAGEMENT
Features
Wide current setting range — 31.25μA to 25mA
Eight identical current drivers with independent
control
5% current matching, 7% accuracy
I 2 C interface for microprocessor control
I 2 C slave address 1110 000x
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
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 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.
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 IN - 1.5V.
All current control is programmed using an I 2 C interface
bus. Only a single input bypass capacitor is required — 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
LED Backlighting
Battery
Main Panel
Sub Panel
Color/R/G/B LEDs
1 μ F
SCL
SDA
EN
IN
SCL
SDA
EN
GND
GND
GND
GND
SC620
ILED1
ILED2
ILED3
ILED4
ILED5
ILED6
ILED7
ILED8
April 22, 2009
? 2009 Semtech Corporation
1
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