MAX1916

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

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


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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.
MAX1916: Typical Operating Circuit MAX1916: Typical Operating Circuit Enlarge+

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)

Applications/Uses

  • Battery-Powered Applications
  • Digital Cameras and Camcorders
  • Next-Generation Wireless handsets
  • PDAs, Palmtops, and Handy Terminals
Part NumberBattery InputRegulation TopologyMax. No. of LEDsLED ChannelsLED ConfigurationILED per Channel
(A)
Dimming ControlVDROPOUT
(mV)
VCURR_SENSE
(mV)
POUT
(W)
VIN
(V)
VIN
(V)
ICC
(mA)
LED String Volt.
(V)
Package/PinsBudgetary
Price
maxtypminmaxmaxmaxSee Notes
MAX1916 1-Cell Li+Linear33Parallel0.06Analog10010012.55.50.15
TSOT/6
$1.06 @1k
See All LED Drivers (81)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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