MAX1916

PRODUCTION

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

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

Data Sheet (Rev. 0) Product Selection Table
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Overview

  • 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)

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.

Applications

  • Battery-Powered Applications
  • Digital Cameras and Camcorders
  • Next-Generation Wireless handsets
  • PDAs, Palmtops, and Handy Terminals
MAX1916
Low-Dropout, Constant-Current Triple White LED Bias Supply
MAX1916: Typical Operating Circuit
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Documentation

Data Sheet 1

Reliability Data 1

Technical Articles 8

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