Step-up DC-DC Converter for White LED Driver

The TB62731FUG is an LED driver that uses a high power efficiency step-up DC-DC converter. The converter turns on/off 2 to 6 white LEDs in series.

The IC incorporates an N-channel MOSFET transistor used for coil-switching and a function that reduces the LED current in response to increase in temperature.

The mean LED current can be easily set using an external resistor.

The IC is ideal as a driver for LED light sources used as liquid crystal backlights for PDAs, cellular phones, and handy terminals.

Features

• Maximum output voltage: Vo ≤ 28 V

• Mean LED current values set according to external resistor

14 mA (typ.) @R_sens = 2.7 Ω

20 mA (typ.) @R_sens = 1.8 Ω

• Supply power: Up to 320 mW supported

• Compact package: SSOP6-P-0.95B, 6 pins

• Built-in temperature derating function: LED current derated automatically depending on temperature

• High power efficiency

Up to 80 of peak power efficiency achieved using recommended components

Ron = 2.0 Ω (typ.) @VIN = 3.2~5.5 V

Built-in low Ron power MOS switch