Description

The YB1314 charge pump drive up to 4 white LEDs with regulated constant current. The devices can be used to produce current levels up to 30mA for each output from a 2.7V to 5.5V input. The 1MHz fix-frequency switching allows for tiny external components, and the regulation scheme is optimized to ensure low EMI and low input ripple.

Features

■ Input Range : 2.7V to 5.5V

■ Drives up to 4 LEDs at 30mA Each

■ 1MHz Internal Oscillator

■ Thermal Protection Shutdown

■ Output Short-circuit Current Limit and Overvoltage Protection

■ Undervoltage Lockout With Hysteresis

■ Automatic Soft-Start Reduces In-Rush Current

■ Three Charge Pump Mode：1x/1.5x/2x

■ 3mm x 3mm QFN package

Applications

■ White LED Backlighting

■ Handheld PCs and PDAs

■ Mobile Phone