General Description

The XL3461 is a 1.2MHz PWM boost switching regulator designed for constant-current white LED driver applications. The XL3461 can drive a string of 2 to 3 white LEDs from a 2.7V supply in series, ensuring uniform brightness and eliminating several ballast resistors. The XL3461 implements a constant frequency 1.2MHz PWM control scheme. The high frequency PWM operation also saves board space by reducing external component sizes. To improve efficiency, the feedback voltage is set to 95 mV, which reduces the power dissipation in the current setting resistor.
The XL3461 is equipped with OVP protection ability, the SW pin monitors the output voltage and will turn off the device if an over-voltage condition is present to prevent damage from an open circuit condition.
The XL3461 is available in SOT-23-5 package.

Features
Inherently Uniform LED Current
High Efficiency up to 84%
Drives 2 to 3 LEDs from a 2.7V Supply
1.2MHz PWM Operation Frequency
Requires Only 0.22 F Output Capacitor
Shutdown Current: < 1 A
Built-in Output Over-Voltage Protection
Under Voltage Lock Out (UVLO)

Applications
Digital Cameras
LCD modules
GPS Receivers
Cellular Phones
PDAs, Handheld Computers

 

XL3461-1.2MHz Boost DC-DC White LED Driver---P2P with RT9271, G5121, RT9284B, CP2126, PT4101 etc