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
MAX1916: Typical Operating Circuit
  • Battery-Powered Applications
  • Digital Cameras and Camcorders
  • Next-Generation Wireless handsets
  • PDAs, Palmtops, and Handy Terminals
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MAX1916 Data SheetMAX1916.pdf
Part NumberBattery InputRegulation TopologyMax. No. of LEDsLED ChannelsLED ConfigurationILED per Channel
Dimming ControlVDROPOUT
LED String Volt.
maxtypminmaxmaxmaxSee Notes
MAX19161-Cell Li+Linear33Parallel0.06Analog10010012.55.50.15TSOT/6$1.06 @1k
Quality and Environmental Data
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX1916EZT+ActiveTSOT,;6 pin;8.3 mm²-40°C to +85°CLead Free
MAX1916EZT+TActiveTSOT,;6 pin;8.3 mm²-40°C to +85°CLead Free
MAX1916EZT-TNo Longer AvailableMAX1916EZT+TTSOT,;6 pin;8.3 mm²-40°C to +85°CNo
MAX1916.pdf MAX1916
MAX1916.pdf MAX1916
MAX1916.pdf MAX1916
Important Design Considerations for Digital Thermometers MAX1416
Important Design Considerations for Heart-Rate and Fitness Monitors MAXQ622
Improve Sensor Performance and SNR in Pulse Oximeter Designs MAXQ622
Driving LEDs in Battery-Operated Applications: Controlling Brightness Power Efficiently MAX8596
MAX1916.pdf MAX1916
MAX1916.pdf MAX1916