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PDF SGM3123 Data sheet ( Hoja de datos )
| Número de pieza | SGM3123 | |
| Descripción | White LED Driver | |
| Fabricantes | Shengbang Microelectronics | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SGM3123 (archivo pdf) en la parte inferior de esta página. Total 10 Páginas | ||
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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
REV. A. 2
1 page  
SGM3123
White LED Driver with
Low Dropout Current Source
TYPICAL PERFORMANCE CHARACTERISTICS
LED Current vs. Input Voltage
30
LED1
25 LED2
LED3
20 LED4
15
10
5
0
2 2.5 3 3.5 4 4.5 5
Input Voltage (V)
5.5
Supply Current vs. Supply Voltage
240
180
120
60
0
1.5
2.5 3.5 4.5
Supply Voltage (V)
5.5
LED Current vs. Temperature
30
25
20
15
10
-40
-15 10 35
Temperature (℃)
60
85
SG Micro Corp
www.sg-micro.com
5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet SGM3123.PDF ] | |
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