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