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FAN5609

Fairchild Semiconductor
Part Number FAN5609
Manufacturer Fairchild Semiconductor
Description LED Driver with Adaptive Charge Pump DC/DC Converter
Published Mar 30, 2005
Detailed Description www.fairchildsemi.com FAN5609 LED Driver with Adaptive Charge Pump DC/DC Converter Features • • • • • Parallel LED Driv...
Datasheet PDF File FAN5609 PDF File

FAN5609
FAN5609

Overview
www.
fairchildsemi.
com FAN5609 LED Driver with Adaptive Charge Pump DC/DC Converter Features • • • • • Parallel LED Driver Supports All Forward Voltages Adaptive VOUT Adjustment to the Highest Diode Voltage Internally Matched LED Current Sources No External Components Needed to Set LED Current Built-in Charge Pump has Three Modes of Operation: – Linear Regulation VIN > 4.
2V – 3/2 DC-DC Converter and Regulation 3.
6V2V – 2/1 DC-DC Converter and Regulation 2.
7V6V Up to 86% Efficiency Low EMI, Low Ripple Up to 80mA Output Current (4 × 20mA) Built-in DAC for Digital or PWM Brightness Control Can be Duty Cycle Modulated between 0 to 18mA 2.
7V to 5.
5V Input Voltage Range ICC < 2µA in Shutdown Mode 1MHz Operating Frequency Shutdown Isolates Output from Input Soft-Start Limits Inrush Current Short Circuit Protection Minimal External Components Needed Available in a 14-lead TSSOP Package Available in a 16-lead MLP Package Applications • • • • • Cell Phones Handheld Computers PDA, DSC, MP3 Players Keyboard Backlight LED Displays Description The FAN5609 generates regulated output current from a battery with input voltage varying between 2.
7V to 5.
5V.
Switch reconfiguration and fractional switching techniques are utilized to achieve high efficiency over the entire input voltage range.
A proprietary internal circuitry continuously monitors each LED current loop and automatically adjusts the generated output DC voltage to the lowest minimum value required by the LED having the highest forward voltage.
This adaptive nature of the FAN5609 eliminates the need for LED pre-selection (matching) and ensures operation at high efficiency.
When the input voltage is sufficiently high to sustain the programmed current level in the LEDs, the FAN5609 re-configures itself to operate as a linear regulator, and the DC-DC converter is turned off.
An internal two-bit digital to analog converter provides programmability of the output currents.
Only two 0.
1µF bucket capacitors and two 4.
7µF ...


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