Nisshinbo Micro Devices R1214Z221A-E2-F, Dual DC-DC, DC-DC Converter 100mA, Externally Adjustable : Maximum of 29 V,

The Nisshinbo Micro Devices DC/DC Converter consists of an Nch MOSFET driver, an oscillator, a PWM comparator, a voltage reference unit, an error amplifier, an overcurrent protection circuit, an under voltage lockout circuit, an overvoltage protection circuit, a thermal shutdown protection circuit and 2 channel current drivers for white LEDs. It requires minimal external component count. By simply using an inductor, a resistor, capacitors and a diode, the white LEDs can be driven with constant current and high efficiency.

PWM control
Overcurrent protection circuit
Thermal shutdown protection circuit
Input voltage range is from 2.7 V to 5.5 V