MAX1916 Datasheet, PDF (1/7 Pages) Maxim Integrated Products – Low-Dropout, Constant-Current Triple White LED Bias Supply

19-2067; Rev 0; 7/01
Low-Dropout, Constant-Current
Triple White LED Bias Supply
General 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 appli-
cations, significantly improved efficiency. The MAX1916
requires a 200mV dropout at a 9mA load on each out-
put to match the LED brightness.
The MAX1916 is available in a space-saving 6-pin Thin
SOT23 package.
Features
o Low 200mV Dropout at 9mA
o Up to 60mA/LED Bias Current
o 0.3% LED Current Matching
o Simple LED Brightness Control
o Low 40µA Supply Current
o Low 0.05µA Shutdown Current
o 2.5V to 5.5V Supply Voltage Range
o Thermal Shutdown Protection
o Tiny 6-Pin Thin SOT23 Package (1mm High)
Applications
Next-Generation Wireless Handsets
PDAs, Palmtops, and Handy Terminals
Digital Cameras, Camcorders
Battery-Powered Equipment
PART
MAX1916EZT
Ordering Information
TEMP. RANGE
-40°C to +85°C
PIN-
PACKAGE
6 Thin SOT23
TOP
MARK
AAAG
Typical Operating Circuit
V+
V_CTRL
ON
OFF
SET LED1 LED2 LED3
EN
MAX1916
GND
TOP VIEW
Pin Configuration
EN 1
6 LED1
MAX1916
GND 2
5 LED2
SET 3
4 LED3
THIN SOT23-6
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