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