MAX1916

19-2067; Rev 0; 7/01 Low-Dropout, Constant-Current Triple White LED Bias Supply General Description The MAX1916 low-dropout bias supply for white LEDs is a high-performance alternative to the simple ballast resistors used in conventional white LED designs. The MAX1916 uses a single resistor to set the bias current for three LEDs, which are matched to 0.3%. The MAX1916 consumes only 40µA of supply current when enabled and 0.05µA when disabled. The MAX1916’s advantages over ballast resistors include significantly better LED-to-LED bias matching, much lower bias variation with supply voltage variation, significantly lower dropout voltage, and in some applications, significantly improved efficiency. The MAX1916 requires a 200mV dropout at a 9mA load on each output to match the LED brightness. The MAX1916 is available in a space-saving 6-pin Thin SOT23 package. o Low 200mV Dropout at 9mA o Up to 60mA/LED Bias Current o 0.3% LED Current Matching o Simple LED Brightness Control o Low 40µA Supply Current o Low 0.05µA Shutdown Current o 2.5V to 5.5V Supply Voltage Range o Thermal Shutdown Protection o Tiny 6-Pin Thin SOT23 Package (1mm High) Features MAX1916 Applications Next-Generation Wireless Handsets PDAs, Palmtops, and Handy Terminals Digital Cameras, Camcorders Battery-Powered Equipment PART MAX1916EZT Ordering Information TEMP. RANGE -40°C to +85°C PINPACKAGE 6 Thin SOT23 TOP MARK AAAG Typical Operating Circuit VCTRL V+ Pin Configuration TOP VIEW EN 1 6 LED1 SET ON OFF ...