SGM3123 Datasheet, PDF (1/10 Pages) SG Micro Corp – White LED Driver with LowDropout CurrentSource

GENERAL DESCRIPTION
The SGM3123 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 SGM3123 uses an internal resistor to set the bias
current for four LEDs, which are matched to ±5%. The
SGM3123'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 SGM3123 requires only a 40mV dropout voltage at
a 20mA load on each output to match the LED
brightness.
The SGM3123 is available in Green TQFN-3×3-16L
package. It operates over an ambient temperature range
of -40℃ to +85℃.
SGM3123
White LED Driver with
Low Dropout Current Source
FEATURES
● Support up to 4 LEDs
● Low 40mV Dropout at 20mA
● Less than ±5% LED Current Matching
● Simple LED Brightness Control
● Low Shutdown Current
● 2.5V to 5.0V Supply Voltage Range
● Thermal Shutdown Protection
● Operating Temperature Range: -40℃ to +85℃
● Available in Green TQFN-3×3-16L 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
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