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FAN5608MPX Datasheet

  • FAN5608MPX

  • Serial/Parallel LED Driver with Current-Regulated, Step-Up D...

  • 17頁

  • FAIRCHILD

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www.fairchildsemi.com
FAN5608
Serial/Parallel LED Driver with Current-Regulated,
Step-Up DC/DC Converter
Features
鈥?Two Independent Channels Drive up to Six LEDs per
Channel
鈥?Adaptive Output Voltage Drive to Maximize Ef鏗乧iency
鈥?PWM/PFM Mode of Operation of the Boost Circuit
鈥?Up to 85% Ef鏗乧iency
鈥?Up to 2
脳
20mA Output
鈥?Two Built-in DACs for Independent (Digital) Brightness
Control for Both Channels
鈥?LED鈥檚 Current Can be Duty-Cycle-Modulated between
0 to 20mA
鈥?Digital, Analog, and PWM Brightness Control
鈥?2.7V to 5V Input Voltage Range
鈥?0.5MHz Operating Frequency (8MHz internal clock)
鈥?Soft Start
鈥?Low Shutdown Current: I
CC
< 1
碌
A
鈥?LED Short Circuit Protection
鈥?Minimal External Components Needed
鈥?Available in space saving 8-lead and 12-lead MLP
Packages.
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鈥檚 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 ef鏗乧iency. 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 speci鏗乪d operating output voltage range. Although it is
not required to have an equal number of LEDs connected in
series within each branch, the highest ef鏗乧iency 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
鏗亁ed supply voltage. The output current can then be
programmed to any desired value within its speci鏗乪d range.
The FAN5608DMPX/FAN5608MPX version uses a single
Applications
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Cell Phones
Handheld Computers
PDAs, DSCs, MP3 Players
Keyboard Backlights
LED Displays
Typical Application
Digital Brightness Control
C
IN
2.7V to 5V
L = 4.7碌H
FAN5608DHMPX
IND
V
IN
DAC Input For CH1
A1
B1
A2
DAC Input For CH2
B2
IND
V
OUT
GND
CH2
CH1
NN
NC
4.7碌F
V
OUT
C
IN
L = 4.7碌H
2.7V to 5V
IND
FAN5608HMPX
V
IN
DAC Input For CH1
A1
B1
A2
DAC Input For CH2
B2
IND
NC
GND
CH2
CH1
NC
4.7碌F
V
OUT
4X4mm MLP-12 Package
with internal Schottky diode
Order Code: FAN5608DHMPX
4X4mm MLP-12 Package
with external Schottky diode
Order Code: FAN5608HMPX
REV. 1.0.3 6/28/04

FAN5608MPX 產(chǎn)品屬性

  • 3,000

  • 集成電路 (IC)

  • PMIC - LED 驅(qū)動器

  • -

  • -

  • -

  • 2

  • 是

  • 背光

  • 白色 LED

  • 500kHz

  • 2.7 V ~ 5.5 V

  • 24V

  • 表面貼裝

  • 8-MLP

  • 8-MLP（3x3）

  • 帶卷 (TR)

  • -40°C ~ 85°C

  • FAN5608MPXTRFAN5608MPX_NLFAN5608MPX_NLTRFAN5608MPX_NLTR-ND

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