SGM3127 Datasheet, PDF (1/11 Pages) SG Micro Corp – LowDropout CurrentSource

SGM3127
White LED Driver with
Low Dropout Current Source
GENERAL DESCRIPTION
The SGM3127 low-dropout bias supply for white LEDs
is a high-performance alternative to the simple ballast
resistors used in conventional white LED designs. It is
optimized for low power keypad and portable
backlighting applications.
The SGM3127 uses an internal resistor to set the bias
current for four LEDs, which are matched to ±5%. The
SGM3127's advantages over ballast resistors include
much lower bias variation with supply voltage variation,
significantly lower dropout voltage, and in some
applications, significantly improved efficiency.
The SGM3127 requires only a 50mV dropout voltage at
a 30mA load on each output to match the LED
brightness.
The SGM3127 is available in Green SOT-23-6 package.
It operates over an ambient temperature range of -40℃
to +85℃.
FEATURES
● Support up to 4 LEDs
● Low 50mV Dropout at 30mA
● Less than ±5% LED Current Matching
● Simple LED Brightness Control
● Low Shutdown Current
● 2.5V to 5.5V Supply Voltage Range
● Thermal Shutdown Protection
● Operating Temperature Range: -40℃ to +85℃
● Available in Green SOT-23-6 Package
APPLICATIONS
Wireless Handsets
MP3, MP4, and PMP
Cellular Phones
Portable Communication Devices
Digital Cameras, Camcorders
PDAs, Palmtops, and Handy Terminals
LED/Display Back Light Driver
LEDs for Camera Flash
Battery-Powered Equipment
SG Micro Corp
www.sg-micro.com
REV. A. 3