4 & 6 CHANNEL CHARGE PUMPS FOR WHITE LED BIAS
FSP3302/FSP3303
FEATURES
Two LED Configurations Available:
FSP3302: Up to 4 LEDs
FSP3303: Up to 6 LEDs
High Efficiency Proprietary Charge Pump
Automatic 1x/1.5x Mode-Switching
Ensures Maximum Efficiency
Wide 2.7V to 5.2V Input Voltage Range
0.3% White LED Brightness Matching
Digitally Programmed 1dB Brightness Steps
Up to 44mA per LED
Automatic Programming Finish Detection
1.2MHz Operation for Low Ripple
Simple Serial Interface
Thermal Shutdown Protection
Tiny QFN16L and µQFN16L Packages
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.
APPLICATIONS
Cell Phones
Portable Devices
PIN CONFIGURATION
(Top View)
1/10
2007-4-10
FOSLINK [ FOSLINK SEMICONDUCTOR CO.,LTD ]
