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FAN5610

By datasheet - April 3rd, 2008

www.fairchildsemi.com

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www.fairchildsemi.com

FAN5610
LED Driver for White, Blue or any Color LED
Features
LED Driver for 4 Parallel-connected LEDs Low Voltage Drop ( 350mV) to Support Direct Li-ion Applications with Low VF LEDs Independent Control Loop for Each LED Regulated, Matched Constant Current in LEDs No External Components No EMI, No Switching Noise Built-in DAC for Digital and PWM Brightness Control Up to 91% Maximum Efficiency Up to 84mA (21mA/LED) Bias Current 2.7V to 5.5V Input Voltage Range ICC 1 A in Shutdown Mode 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 efficiency, the value of the internal current sense resistors connected in series with the LEDs is very low (10). This is an important consideration for direct DC-driven white LEDs in battery-powered systems. The LEDs 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 A. 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
Cell Phones Handheld Computers PDA, DSC, MP3 Players LCD Display Modules Keyboard Backlight LED Displays

Typical Application

VIN

VIN

D4

D3

D2

D1

D A C

IN A

FAN5610
IN B GND

REV. 1.0.2 10/28/03

FAN5610 Datasheet Fairchild Download PDF

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