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FAN5608HMPX-FAN5608MPX Fast Delivery,Good Price
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FAN5608HMPX-FAN5608MPX
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 PWM/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’s Current Can be Duty-Cycle-Modulated between
0 to 20mA Digital, Analog, and PWM Brightness Control 2.7V to 5.5V Input Voltage Range 0.5MHz Operating Frequency (8MHz internal clock) Soft Start Low Shutdown Current: I
< 1 LED Short Circuit Protection Minimal External Components Needed Available in space saving 8-lead and 12-lead MLP
Packages.
Applications
Cell Phones Handheld Computers PDAs, DSCs, MP3 Players Keyboard Backlights LED Displays
Description

The FAN5608 LED driver generates regulated output cur-
rents from a battery with input voltage varying between 2.7V
to 5V. An internal NMOS switch drives an external inductor,
and a Schottky diode delivers the inductor’s stored energy to
the load. Proprietary internal circuitry continuously monitors
the currrent on both strings and automatically adjusts the
generated output DC voltage to the lowest minimum value
required by the LEDs string with the highest summarized
forward voltage. This adaptive nature of the FAN5608
ensures operation at the highest possible efficiency. Soft start
circuitry prevents excessive current drawn from the supply
during power on. Any number of LEDs can be connected in
series as long as the summed forward voltages do not exceed
the specified operating output voltage range. Although it is
not required to have an equal number of LEDs connected in
series within each branch, the highest efficiency and best
current regulation is always achieved when an equal number
of LEDs are serially connected.
In the FAN5608 device, two internal two-bit D/A converters
provide independent programmability of each output channel
current. Analog programming of the output current is
also possible in the FAN5608. To do this, ground the "B"
pins and connect a resistor between the "A" pins and a
fixed supply voltage. The output current can then be
programmed to any desired value within its specified range.
The FAN5608DMPX/FAN5608MPX version uses a single
Digital Brightness Control
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