500 mW Boost Converter for White LEDs

The NCP5010 is a fixed frequency PWM boost converter with integrated rectification optimized for constant current applications such as driving white LEDs. This device features small size, minimal external components and high−efficiency for use in portable applications and is capable of providing up to 500 mW output power to 2−5 series connected white LEDs. A single resistor sets the LED current and the CTRL pin can be pulse width modulated (PWM) to reduce the LED Current. The device can also be configured as a fixed output voltage boost converter for applications such as OLED bias where it is capable of generating voltage up to 20 V.

FEATUREs
• 2.7 to 5.5 V Input Voltage Range
• Efficiency: 84% for 5 LED (VF = 3.5 V by LED) at 30 mA and 4.2 V VIN
• Low Noise 1 MHz PWM DC−DC Converter with Damping Switch
• Open LED Protection and Short Circuit Protection
• Serial LEDs Architecture for Uniform Current Matching
• 1 A Shutdown Current Facility with True−Cutoff
• Very Small 8−Pin Flip−Chip 1.7 x 1.7 mm Package

Typical Applications
• White LED Backlighting for Small Color LCD Displays
• Cellular Phones
• Digital Cameras
• MP3 Players
• High Efficiency Step−up Converter