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X R P 7 6 2 0
4 - C h a n n e l A d j u s t a b l e C u r r e n t I 2 C C o n t r o l l e d L E D D r i v e r
Supporting an industry standard 2-wire I C
June 2012
GENERAL DESCRIPTION
The XRP7620 is a multi purpose 4-channel
independently adjustable current sink driver.
Optimized for LED backlighting and
RGBW/RGBA color mixing applications, the
XRP7620 can also be used as a generic
software programmable current sink I/O
expander.
2
serial interface, the XRP7620 provides full
independent control of each channel and can
be programmed up to a current of 31.5mA in
steps of 0.5mA. Uniform display brightness is
ensured through better than 3% channel to
channel current matching.
Five internal registers are provided to set
operational configuration and individual
channel current programmation. A specific
shutdown mode allows the device to retain the
previously loaded configuration – operational
and current programming – in order to be
reused upon the next enabling.
The XRP7620 is designed to operate from a
single cell lithium-ion battery or fixed 3.3V or
5.0V power rails and is available in a RoHS
compliant, “green”/ halogen free space saving
8-pin 2mmx3mm DFN package.
Rev. 1.1.0
APPLICATIONS
? LCD Display & Keypad Backlighting
? Color Coded Indicator Lighting
? RGBW/RGBA Color Mixing
? Cell Phones & Handheld Devices
? Generic Current Sink I/O Expander
FEATURES
? 4-Channel LED Current Sink Driver
? Individual Channel Current Control
? Up to 31.5mA per channel / 0.5mA Steps
? 100mV Channel Dropout Voltage
? I 2 C Serial Interface
? 2.7V - 5.5V Input Voltage Range
? 3% Channel Current Matching
? Register Retention in Shutdown
? Shutdown Current <1μA
? Thermal and UVLO Built-in Protection
? RoHS Compliant, “Green”/Halogen
Free 2x3mm 8-Pin DFN package
TYPICAL APPLICATION DIAGRAM
Fig. 1: XRP7620 Application Diagram
Exar Corporation
48720 Kato Road, Fremont CA 94538, USA
www.exar.com
Tel. +1 510 668-7000 – Fax. +1 510 668-7001
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