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

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

Product Details

Key Features

Parametric specs for LED Drivers
VIN (V) (min) 2.5
VIN (V) (max) 5.5
Max. No. of LEDs 3
# LED Channels 3
Regulation Topology Linear
Battery Input 1-Cell Li+
LED Configuration Parallel
ILED per Channel (A) (max) 0.06
Dimming Control Analog
VDROPOUT (mV) (typ) 100
VCURR_SENSE (mV) 100
POUT (W) 1
ICC (mA) (max) 0.1
LED String Volt. (V) (max) 5
Package/Pins TSOT/6
Budgetary
Price (See Notes)
1.26
View Less

Simplified Block Diagram

Support & Training

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Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.

Parameters

Parametric specs for LED Drivers
VIN (V) (min) 2.5
VIN (V) (max) 5.5
Max. No. of LEDs 3
# LED Channels 3
Regulation Topology Linear
Battery Input 1-Cell Li+
LED Configuration Parallel
ILED per Channel (A) (max) 0.06
Dimming Control Analog
VDROPOUT (mV) (typ) 100
VCURR_SENSE (mV) 100
POUT (W) 1
ICC (mA) (max) 0.1
LED String Volt. (V) (max) 5
Package/Pins TSOT/6
Budgetary
Price (See Notes)
1.26

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

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.

Simplified Block Diagram

MAX1916: Typical Operating Circuit MAX1916: Typical Operating Circuit Zoom icon

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.