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FAN5609MPX
LED Driver with Adaptive Charge Pump DC/DC Converter
Features Parallel LED Driver Supports All Forward Voltages Adaptive V
OUT
Adjustment to the Highest Diode V oltage Internally Matched LED Current Sources No External Components Needed to Set LED Current Built-in Charge Pump has Three Modes of Operation: Linear Regulation V
IN
> 4.2V 3/2 DC-DC Converter and Regulation 3.6V
<4.2V 2/1 DC-DC Converter and Regulation 2.7V<3.6V 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
< 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 opera-
tion 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 input/output capacitors are needed for proper
operation.
Soft-start circuitry prevents excessive current draw during
power on. The device has built-in short circuit protection.
