鈥?/div>
Drives Up to Six LEDs in Series
Pulse Skip PWM Mode of Operation of the Boost Circuit
Up to 90% Peak Ef鏗乧iency
No External Schottky Diode Required
Up to 25mA Output
Built-in DAC for Digital Brightness Control
LED鈥檚 Current Can be Duty-Cycle-Modulated
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
CC
< 1
碌
A
LED Short Circuit Protection
Minimal External Components Needed
Available in an 8-lead MLP Package
Description
The FAN5606 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. 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 volt-
ages do not lead to exceeding the speci鏗乪d operating output
voltage range.
In the FAN5606 device, the internal two-bit D/A converters
provide programmability of the output channel current.
Analog programming of the output current is also possible
in the FAN5606. To do this, ground the 鈥淏鈥?pin and connect
a resistor between the 鈥淎鈥?pin 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 analog version uses a
single external resistor to set the current, and to turn the
device ON and OFF. The device is available in an 8-lead
MLP package.
Applications
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Cell Phones
Handheld Computers
PDAs, DSCs, MP3 Players
Keyboard Backlights
LED Display
Typical Applications
Analog Brightness Control
V
OUT
2.7V to 5.5V L = 6.8碌H
IND
V
OUT
GND
IN
Digital Brightness Control
V
OUT
2.7V to 5.5V L = 6.8碌H
IND
GND
IN
4.7碌F
4.7碌F
C
IN
V
IN
C
IN
V
IN
FAN5606
FAN5606
CAT
CAT
V
External
R
A
B
DAC Inputs
A
B
REV. 1.0.3 1/7/05
FAN5606DMPX相關(guān)型號(hào)PDF文件下載
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