YB1315 Datasheet | YOBON TECHNOLOGIES

Description The YB1315 charge pump is designed to drive up to 5 white LEDs with regulated constant current in backlight display application. The device can provide up to 25m A per LED for a total 5 channels. The output current can also be bined into one single channel with 125m A output current for flash-light applications. The input voltage ranges from 2.7V to 5.5V and is ideal for applications powered by a single Li-Ion or 3 to 4 Ni Cd, Ni MH or Alkaline batteries. YB1315 monitors the power-supply input voltage and LED forward voltage and current, and does an automatic selection to a switching mode that is optimized for the power conversion efficiency as well as battery operating time. The 1MHz fixed frequency switching allows for tiny external ponents, and the regulation scheme is optimized to ensure low EMI and low input ripple. Internal soft-start circuitry effectively reduces the in-rush current. YB1315 also provides short circuit protection, over-temperature protection and over-voltage protection. In shutdown mode, the shutdown current is less than 1μA. YB1315 is available in a TQFN-16 3x3 package. Features - Voltage Input Range From 2.7V to 5.5V - Drives From 3 to 5 LEDs at Up to 25m A - - - - - - Each Fractional Conversion Modes for High Conversion Efficiency, 1x and 1.5x 1MHz Internal Oscillator Thermal Protection Shutdown Output Short-circuit Current Limit and Over-Voltage Protection Under-Voltage Lockout with Hysteresis Automatic Soft-Start Reduces In-Rush Current - 3mm x 3mm TQFN Package Applications - White LED Backlighting - Handheld PCs and PDAs - Mobile Phone - DSC and DV flash light application Typical Application Circuit VIN VIN = 2.7V to 5.5V 0. 47 µF C1C2+ 0. 47 µF C2EN1 1µF EN2 ISET GND PGND D2 D3 D4 D5 C1+ VOUT D1 1u F Figure 1: Typical Application Circuit YB1315 Rev.0.1 .yobon..tw 1 Preliminary YB1315 High Efficiency Charge Pump White LED Driver C1+ VIN GND EN1 EN2 13 14 15 16 1 C2+ 9 8 7 6 5 Pin Configuration C2C1-...