资 源 简 介
The AME5144 is an efficient driver for up to ten whiteLED applicaTIons. They are ideal for large LCD backlightdisplays in Cell Phone, PDAs, and other handheld devices.The AME5144 is switch-mode boost converter with constantLED current, rather than output voltage. The seriesconnecTIon allows the LED currents to be idenTIcal for uniformbrightness and minimizes the number of trace to theLEDs. The AME5144 drives series-connected LEDs tocontrolled-current pin which connected a typically 13Wsense resistor, not an expensive fracTIon-ohm value.Fast 1MHz current-mode PWM operation allows for smallinput and output capacitors and a small inductor while minimizingripple on the input supply/battery. Soft-start eliminatesinrush current during startup. To control LED brightness,the LED current can be pulsed by applying a singleanalog/PWM signal with a frequency range from 200Hz to30KHz for the control pin CTRL.The AME5144 is available in space saving, 8 pin, 3mm x3mm x 0.75mm DFN package.
