FAN5616

www.DataSheet4U.com FAN5616 High-Efficiency, Constant-Current LED Driver with Adaptive Charge Pump November 2005 FAN5616 High-Efficiency, Constant-Current LED Driver with Adaptive Charge Pump Features ■ 3-Channel Parallel LED Driver for a Large Range of ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ Description The FAN5616 generates a regulated output current from a battery with an input voltage between 2.7V to 5.5V. Switch reconfiguration and fractional switching techniques are utilized to achieve high efficiency over the entire input voltage range. The adaptive nature of the built-in charge pump eliminates the need for LED preselection (matching) and ensures operation with high efficiency. The driver's built-in, proprietary, auto-sense circuitry ensures the same high efficiency regardless of the number of LEDs. When the input voltage is sufficiently high to sustain the LED’s programmed current level, the FAN5616 reconfigures itself to operate as a linear regulator, and the charge pump is turned off. The FAN5616 supports both digital and PWM LED brightness control methods. The built-in 2-bit DAC offers a selection of four LED current levels, each level is a percentage of the maximum LED current set by the external RSET resistor. The FAN5616 includes built-in shutdown, short circuit and thermal protection circuitry. A built-in smart soft-start circuitry prevents excessive current draw during power on while allowing for an increased PWM frequency for dimming. Minimal external components ar...