FSP3302 Datasheet, PDF (1/10 Pages) FOSLINK SEMICONDUCTOR CO.,LTD – 4 & 6 CHANNEL CHARGE PUMPS FOR WHITE LED BIAS

4 & 6 CHANNEL CHARGE PUMPS FOR WHITE LED BIAS
„ FEATURES
z Two LED Configurations Available:
FSP3302: Up to 4 LEDs
FSP3303: Up to 6 LEDs
z High Efficiency Proprietary Charge Pump
z Automatic 1x/1.5x Mode-Switching
Ensures Maximum Efficiency
z Wide 2.7V to 5.2V Input Voltage Range
z 0.3% White LED Brightness Matching
z Digitally Programmed 1dB Brightness Steps
Up to 44mA per LED
z Automatic Programming Finish Detection
z 1.2MHz Operation for Low Ripple
z Simple Serial Interface
z Thermal Shutdown Protection
z Tiny QFN16L and µQFN16L Packages
„ APPLICATIONS
z Cell Phones
z Portable Devices
„ PIN CONFIGURATION
FSP3302/FSP3303
„ GENERAL DESCRIPTION
The FSP3302/FSP3303 are high performance, white
LED bias generators for systems consisting of multiple
white LEDs. The FSP3302/FSP3303 are identical
except for the number of LEDs they drive; FSP3302
supports up to four LEDs, while FSP3303 can supply up
to six LEDs.
These devices integrate proprietary constant-frequency
charge pump circuitry that includes automatic
mode-switching to maximize efficiency with accurate,
matched current sources that drive the white LEDs.
Current matching is better than 0.3%, resulting in highly
uniform brightness across different LED channels.
The FSP3302/FSP3303 feature adjustable LED bias
currents, which are programmable through a simple
serial interface. Charge pump operation at 1.2MHz
allows the use of small capacitors and minimizes ripple.
The devices also feature soft-start circuitry to limit
inrush current during startup, and thermal shutdown
protection.
The FSP3302/FSP3303 are available in space saving
QFN16L and µQFN16L packages.
(Top View)
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2007-4-10