The LP3321 is a 1.3MHz PWM boost switching regulator designed for constant- current white LED driver applications. The LP3321 can drive a string of up to 10 white LEDs in series, ensuring uniform brightness and eliminating several ballast resistors. The LP3321 implements a constant frequency 1.3MHz 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 195 mV and 300mV, which reduces the power dissipation in the current setting resistor. Highly integration and internal compensation network minimizes as 5 external component counts. Optimized operation frequency can meet the requirement of small LC filters value and low operation current with high efficiency.
Applications
- WLED Backlight driver
- OLED Backlight driver
- PDA
- MID/PTV
