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MAX1916：Low-Dropout, Constant-Current Triple White LED Bias Supply

Power 3 White LEDs Directly From Single Li+ with 0.3% Brightness Matching

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.

Key Features Low 200mV Dropout at 9mA Up to 60mA/LED Bias Current 0.3% LED Current Matching Simple LED Brightness Control Low 40µA Supply Current Low 0.05µA Shutdown Current 2.5V to 5.5V Supply Voltage Range Thermal Shutdown Protection Tiny 6-Pin Thin SOT23 Package (1mm High)

MAX1916: Typical Operating Circuit Applications/Uses Battery-Powered Applications Digital Cameras and Camcorders Next-Generation Wireless handsets PDAs, Palmtops, and Handy Terminals

DataSheet

Parametrics

Quality and Environmental Data

• MAX1916.pdf

Ordering Information