www.fairchildsemi.com
FAN5610
LED Driver for White, Blue or any Color LED
Features
鈥?LED Driver for 4 Parallel-connected LEDs
鈥?Low Voltage Drop (<350mV) to Support Direct Li-ion
Applications with Low V
F
LEDs
鈥?Independent Control Loop for Each LED
鈥?Regulated, Matched Constant Current in LEDs
鈥?No External Components
鈥?No EMI, No Switching Noise
鈥?Built-in DAC for Digital and PWM Brightness Control
鈥?Up to 91% Maximum Ef鏗乧iency
鈥?Up to 84mA (21mA/LED) Bias Current
鈥?2.7V to 5.5V Input Voltage Range
鈥?I
CC
< 1碌A(chǔ) in Shutdown Mode
鈥?3mmX3mm MLP-8 Package
Description
The FAN5610 generates matched current source drives for a
maximum of four LEDs. Since each LED current source has
its own self-regulating loop, precise current matching is
maintained even if there is a substantial forward voltage
spread among the LEDs. LED pre-selection therefore is not
required. In order to minimize voltage drop, and maximize
ef鏗乧iency, the value of the internal current sense resistors
connected in series with the LEDs is very low (10
鈩?/div>
). This is
an important consideration for direct DC-driven white LEDs
in battery-powered systems.
The LEDs鈥?current can be set to 0mA (OFF Mode), 7mA,
14mA, and 21mA with a built-in two-bit digital-to-analog
converter. Customized current settings can also be used.
When the control bits are set to zero, the internal circuitry is
disabled and the quiescent current drops below 1碌A(chǔ).
Both digital input lines (A, B) can be pulse-width-modulated
(PWM). Using PWM, any value of average LED current can
be obtained within the 1 to 20 mA range. The FAN5610 is
available in an 8-lead 3X3 MLP package.
Applications
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Cell Phones
Handheld Computers
PDA, DSC, MP3 Players
LCD Display Modules
Keyboard Backlight
LED Displays
Typical Application
V
IN
V
IN
D4
D3
D2
D1
D
A
C
IN A
FAN5610
IN B
GND
REV. 1.0.2 10/28/03
FAN5610MPX相關(guān)型號PDF文件下載
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