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FAN5608 Datasheet(PDF) 1 Page - Fairchild Semiconductor

Part No. FAN5608
Description  Serial / Parallel LED Driver with Current-Regulated, Step-Up DC/DC Converter
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Maker  FAIRCHILD [Fairchild Semiconductor]
Homepage  http://www.fairchildsemi.com
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FAN5608 Datasheet(HTML) 1 Page - Fairchild Semiconductor

 
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August 2006
© 2006 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN5608 Rev. 1.0.5 • 8/8/06
FAN5608 Serial / Parallel LED Driver with
Current-Regulated, Step-Up DC/DC Converter
Features
Two independent channels drive up to six LEDs
per channel
Adaptive output voltage drive to maximize efficiency
PFM mode of operation of the boost circuit
Up to 85% efficiency
Up to 2×20mA output
Two built-in DACs for independent (digital) brightness
control for both channels
LED current can be duty-cycle-modulated, 0 to 20mA
Digital, analog, and PWM brightness control
2.7V to 5.5V input voltage range
500KHz operating frequency
Soft-start feature
Low shutdown current: ICC< 1μA
Open-load protection
Minimal external components needed
Space-saving 4x4mm 12-lead MLP packages
Applications
Cell phones
Handheld computers
PDAs, DSCs, MP3 players
Keyboard backlights
LED displays
Description
The FAN5608 is an integrated Schottky diode LED
driver, which generates regulated output currents from a
battery input voltage of 2.7V to 5V. An internal MOS
switch and the external inductor deliver the necessary
voltage
to
the
load.
The
proprietary
internal
compensation loop continuously monitors the lowest
LED cathode voltage of both channels and adjusts the
VOUT voltage to the minimum value. The minimum VOUT
is determined by the highest LED forward voltage of the
selected channel. This adaptive nature allows the
FAN5608 architecture to deliver high efficiency. Up to
twelve LEDs can be connected in series as long as the
summed forward voltage does not exceed the maximum
specification of 24V. It is not required to match an equal
number of LEDs serially within each channel; FAN5608
delivers the highest efficiency and best current
regulation in the balanced configuration.
FAN5608 has two internal two-bit D/A converters that
provide independent programmability to each output
channel. In analog programming, "B" pins must be GND
(logic “0”); a resistor must be connected between pin “A”
and a fixed supply voltage. The output current can be
programmed to any desired value within the specified
range. The FAN5608DHMPX is available in a 4x4mm
12-lead MLP package. A single external resistor sets the
current and turns the device ON and OFF.
Ordering Information
Part Number
Pb-Free
Schottky Diode
Package
Packing Method
FAN5608DHMPX
Yes
Internal
MLP-12 4x4mm
Tape and Reel


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