PS1313
High Efficiency, High Power
White-LED Driver
FEATURES
On Board Power MOSFET
Drives up to 4 strings of parallel LEDs
Up to 87% Efficiency
1.4MHz Fixed Switching Frequency
Open Load Shutdown
Low 100mV Feedback Voltage
Soft Start
PWM Dimming Control
UVLO, Thermal Shutdown
Internal Circuit Limit
Available in SOT26 Package
WLED Backlight
Cell Phones
Handheld Computers and PDAs
Digital Cameras
Small LCD Displays
LED Module
Game Devices
DESCRIPTION
APPLICATIONS
The PS1313 is a step up converter designed for
driving up to 4 branches with 4 white LEDs in series
in each branch, providing backlight in cell phones,
PDAs, and other hand-held devices. The PS1313
uses current mode, fixed frequency architecture to
regulate the LED current, which is measured
through an external current sense resistor. Its low
100mV feedback voltage reduces power loss and
improves efficiency. The OV pin monitors the output
voltage and turns off the converter if an over-
voltage condition is present due to an open circuit
condition.
The PS1313 includes under-voltage lockout, current
limiting and thermal overload protection preventing
damage in the event of an output overload. The
PS1313 is available in small 6-pin SOT26 Package.
TYPICAL APPLICATION CIRCUIT
Fig: Typical Application Circuit with 20mA Output
July 2007
www.picsemi.com
© 2007 Power IC. All Rights Reserved.
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