IS31BL3230 Datasheet, PDF (1/9 Pages) Integrated Silicon Solution, Inc – 8 CHANNELS CONSTANT CURRENT LED DRIVER

IS31BL3230
8 CHANNELS CONSTANT CURRENT LED DRIVER
WITH PWM BRIGHTNESS CONTROL
February 2012
GENERAL DESCRIPTION
The IS31BL3230 provides eight regulated current
sources, each delivers up to 40mA of load current with
careful selection of external sense resistors, all outputs
at the IS31BL3230 may be connected in parallel to
enable the current through the LED to be as high as
320mA.
The IS31BL3230 does not include a charge pump and
therefore has no noise and significantly improved the
efficiency. The external resistor, R_SET1, determines the
constant current output of ports LED1 thru LED4, while
resistor R_SET2 determines the constant current output of
ports LED5 thru LED8.
Brightness can be controlled with PWM techniques. The
constant current source is set with two external sense
resistors.
Alternatively, a PWM signal applied to the PWM pin can
vary the perceived brightness of the LED. The device is
in shut down mode when the PWM Input is logic low.
FEATURES
 Ultra low headroom voltage
 Cost effective LED driver
 Current adjustable via external resistors
 Best Noise and Efficiency Performance
 Highly integrated design, minimal component
 1.6μA (typ.) Shutdown current
 Small package QFN-16 3mm×3mm
APPLICATIONS
 Flash LED driver
 Backlight LED driver
TYPICAL APPLICATION CIRCUIT
V_IN
Cin 1uF
PWM
R_SET1
I_SET1
I_SET2
R_SET2
GND
LED1
LED2
LED3
LED4
LED5
LED6
LED7
LED8
Figure 1 Typical Application Circuit
Integrated Silicon Solution, Inc. – www.issi.com
1
Rev.A, 01/05/2011