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PDF BL8588 Data sheet ( Hoja de datos )

Número de pieza BL8588
Descripción High Efficiency 1x/1.5x Charge Pump 4-Channels LED Driver
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No Preview Available ! BL8588 Hoja de datos, Descripción, Manual

BL8588
High Efficiency 1×/1.5× Charge Pump 4-Channels LED Driver
DESCRIPTION
BL8588 is a low noise, high efficiency, and
constant frequency charge pump DC/DC
converter for white LED application. The
operation frequency is 1MHz.
BL8588 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.
BL8588 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
BL8588
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BL8588 pdf
OPERATION WAVEFORMS
LED current
EN
BL8588
LED current
EN
Fig. 1 Startup from EN pin
Fig. 2 Shutdown from EN pin
Output voltage ripple
LED current
Input voltage ripple
Fig. 3 Operating at 1.5x mode with 100% brightness
Input current
Input voltage ripple
Output voltage ripple
Fig. 4 Operating at 1x mode with 100% brightness
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