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BL8587

BELLING
Part Number BL8587
Manufacturer BELLING
Description High Efficiency 1x/1.5x Charge Pump 4-Channels LED Driver
Published Jul 18, 2015
Detailed Description BL8587 High Efficiency 1×/1.5× Charge Pump 4-Channels LED Driver DESCRIPTION BL8587 is a low noise, high efficiency, a...
Datasheet PDF File BL8587 PDF File

BL8587
BL8587

Overview
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 Channel 2 sink current input Channel 1 sink current input Signal ground Charge pump output to drive load circuit, a 1µF capacitor should be used to short this pin to ground.
Flying capacitor 2 positive terminal.
Connect a 1µF capacitor between C2+ and C2-.
Flying capacitor 1 positive terminal.
Connect a 1µF capacitor between C1+ and C1-.
Flying capacitor 1 negative terminal.
Flying capacitor 2 negative terminal.
Power supply input, a 1µF capacitor is required to connect this pin to ground.
Power gro...


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