PS1518 Datasheet, PDF (1/12 Pages) Power IC Ltd. – High Efficiency, Fixed Frequency WLED Driver

PS1518
High Efficiency,
Fixed Frequency WLED Driver
FEATURES
ƒ On Board Power MOSFET
ƒ Drives up to 8 Series White LEDs
ƒ Up to 87% Efficiency
ƒ Over 645 KHz Fixed Switching Frequency
ƒ Open Load Shutdown
ƒ Low 100mV Feedback Voltage
ƒ Soft Start/PWM Dimming
ƒ UVLO, Thermal Shutdown
ƒ Internal Current Limit
ƒ Available in 6L-SOT26 and QFN-8 Packages
APPLICATIONS
ƒ Cell Phones
ƒ Handheld Computers and PDAs.
ƒ Digital Still Cameras.
ƒ Small LCD Displays
DESCRIPTION
The PS1518 is a step up converter designed for
driving up to 8 series white LEDs from 5V input. The
PS1518 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 PS1518 includes under-voltage lockout, current
limiting and thermal overload protection preventing
damage in the event of an output overload. The
PS1518 is available in small 6-pin TSOT23.
TYPICAL APPLICATION CIRCUIT
July 2007
www.picsemi.com
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