BL8587

BL8587 High Efficiency 1×/1.5× Charge Pump 4-Channels LED Driver DESCRIPTION BL8587 is a low noise, high efficiency, and constant frequency charge pump DC/DC converter for white LED application. The operation frequency is 1MHz. BL8587 works in load switch (1×) and fractional (1.5×) modes with four independent control outputs, each channel can provide 20mA constant current precisely from a 2.8V to 5.5V supply. Only two external 1µF and two 0.47µF capacitors are required to build a compact and low-cost power supply solution. BL8587 uses EN pin for simple on/off control and single wire serial pulse dimming in 16 steps. A low current shutdown feature disconnects the load from VIN and reduces quiescent current to less than 1µA. FEATURES Input range: 2.8-5.5V ±1% LED current accuracy 20mA driver capacity each channel Auto 1×/1.5× mode switchover PWM dimming control Serial-pulse dimming control in linear 16 steps Short-circuit protection Thermal shutdown 1MHz constant switching frequency 3mm×3mm QFN package APPLICATION Programmable Current Sinks White LED Backlighting Cell Phones and Smart phones PDAs, Digital Cameras, and Camcorders Color (RGB) Lighting TYPICAL APPLICATION CIRCUIT BL8587 www.belling.com.cn 1 BL8587 PIN DISCRIPTIONS Pin No. 1 2 3 4 5 6 7 8 Symbol NC NC D4 D3 D2 D1 GND VOUT 9 C2+ 10 C1+ 11 C112 C213 VIN 14 PGND 15 NC 16 EN Description No connection No connection Channel 4 sink current input Channel 3 sink current input Chan...