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 V
IN
and reduces
quiescent current to less than 1 A.
FEATURES
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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
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Programmable Current Sinks
White LED Backlighting
Cell Phones and Smart phones
PDAs, Digital Cameras, and Camcorders
Color (RGB) Lighting
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TYPICAL APPLICATION CIRCUIT
BL8587
www.belling.com.cn
1
BELLING [ SHANGHAI BELLING CO., LTD. ]
