IS31BL3212 Datasheet, PDF (1/9 Pages) Integrated Silicon Solution, Inc – FOUR CHANNEL CONSTANT CURRENT LED DRIVER

IS31BL3212
FOUR CHANNEL CONSTANT CURRENT LED DRIVER
January 2012
GENERAL DESCRIPTION
The IS31BL3212 provides four regulated current
sources, delivers up to 23mA of load current to
accommodate four white LEDs. It requires no charge
pump, has no noise and significantly improved the
efficiency.
The serial digital input is used to enable, disable, and
set current for each LED with 16 settings down to
0.69mA. A low-current shutdown feature disconnects
the load from the input and reduces quiescent current
typically 1.0mA.
The IS31BL3212 is available in a Pb-free,
space-saving 2mm×2mm DFN-8 package.
FEATURES
 Ultra low headroom voltage
 Cost effective LED driver
 Four channel constant current output ideal for
driving LEDs
 Best noise and efficiency performance
 Ultra low quiescent supply current: 1.0mA (typ.)
 Highly integrated design, minimal component
 Low shutdown current: 1.0μA (typ.)
APPLICATIONS
 White LED display backlights
 White LED keypad backlights
 Cell Li-ion battery-operated equipment including
PDAs, hand-held PCs, cellular phone
TYPICAL APPLICATION CIRCUIT
Figure 1 Typical Application Circuit (IS31BL3212)
Figure 2 Application Circuit for Less Than 4 LEDs (IS31BL3212)
Note: If less than four LEDs connected, the left pin can be floating or connected to GND. Connecting to GND is recommended.
Integrated Silicon Solution, Inc. – www.issi.com
1
Rev.A, 12/29/2011