YB1313

www.DataSheet4U.com YB1313 1x/1.5x/2x Charge Pump for White LED Application Features „ Input Range : 2.7V to 5.5V „ Drives up to 5 LEDs at 25mA Each „ 1MHz Internal Oscillator „ Thermal Protection Shutdown „ Output Short-circuit Current Limit and „ „ „ „ Description The YB1313 charge pump is designed to drive up to 5 white LEDs with regulated constant current in back lit display application. The device can provide up to 25 mA per LED for a total of more than 125 mA. 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 NiCd, NiMH or Alkaline batteries. The 1MHz fix-frequency switching allows for tiny external components, and the regulation scheme is optimized to ensure low EMI and low input ripple. Internal soft-start circuitry effectively reduces the in-rush current. YB1313 also provides short circuit protection, over-temperature protection and over-voltage protection. In shutdown mode, the shutdown current is less than 1μA. YB1313 is available in a TQFN-16 3x3 package. Over-voltage Protection Under-Voltage Lockout With Hysteresis Automatic Soft-Start Reduces In-Rush Current Three Charge Pump Mode：1x/1.5x/2x 3mm x 3mm TQFN package Applications „ White LED Backlighting „ Handheld PCs and PDAs „ Mobile Phone Typical Application Circuit VIN VIN = 2.7V To 5.5V 0. 47 µF C1C2+ 0. 47 µF C2EN1 1 µF EN2 C1+ VOUT D1 D2 2.2uF YB 1313 D3 D4 D5 ISET GND PGND Figure 1. Typical application circuit YB1313 MRev.1.1 www.yobon...