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G5921 Datasheet(PDF) 1 Page - Global Mixed-mode Technology Inc

Part # G5921
Description  Ultra Low-Dropout, Constant-Current White LED Bias
PDF  9 Pages
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Manufacturer  GMT [Global Mixed-mode Technology Inc]
Direct Link  http://www.gmt.com.tw
Logo GMT - Global Mixed-mode Technology Inc

G5921 Datasheet(HTML) 1 Page - Global Mixed-mode Technology Inc

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Ver: 0.4 Preliminary
Feb 03, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
1
G5920/G5921
Global Mixed-mode Technology Inc.
Ultra Low-Dropout, Constant-Current White LED Bias
Features
Ultra Low 150mV Dropout at 20mA
0.6% High Accuracy Current Matching
20mA Full Scale Current
32 Level Linear Current Brightness Control
PWM Brightness Control
2.5V to 5.5V Supply Voltage Range
SOT-23-6 Package (G5920)
MSOP-8 Package (G5921)
Applications
Mobile Phones
White LED backlighting
General Description
The G5920/G5921 is a high performance ultra low-
dropout constant current bias supply for white LEDs. It
can be used as an alternative to the simple ballast
resistors in conventional parallel white LEDs applica-
tions. Each white LED bias current is matching to
0.6%.
For dimming control, an enable input pin is controlled
by processor GPIO output pulses for 32 level linear
current. Using a low frequency PWM waveform to this
enable input pin also controls the average LED current
which is proportional to the PWM duty.
The G5920/G5921 is suitable for single cell Li-ion bat-
tery power device that using low forward voltage white
LEDs. The white LEDs can be powered directly from
battery without extra external components. This takes
an advantage of highest efficiency and creates no EMI
problem.
Ordering Information
ORDER
NUMBER
ORDER NUMBER
(Pb free)
MARKING
TEMP. RANGE
PACKAGE
G5920TB1U
G5920TB1Uf
5920x
-40°C to 85°C
SOT-23-6
G5921P8U
G5921P8Uf
5921x
-40°C to 85°C
MSOP-8
Note:TB : SOT23-6
P8: MSOP-8
U: Tape & Reel
Pin Configuration
Typical Application Circuit
EN
VCC
GND
LED2 1
2
34
5
6
G5920
SOT-23-6
LED3
LED1
PWM Dimming
Linear Current Dimming
EN
LED1
GND
G5920
LED2
LED3
VCC
V
BAT
0.1µF
EN
LED1
GND
G5920
LED2
LED3
VCC
V
BAT
0.1µF
8
6
5
1
2
3
4
LED3
LED1
LED2
MSOP-8
G5921
7
VCC
N.C.
GND
LED4
EN
EN
VCC
GND
LED2 1
2
34
5
6
G5920
SOT-23-6
LED3
LED1
PWM Dimming
Linear Current Dimming
EN
LED1
GND
G5920
LED2
LED3
VCC
V
BAT
0.1µF
EN
LED1
GND
G5920
LED2
LED3
VCC
V
BAT
0.1µF
8
6
5
1
2
3
4
LED3
LED1
LED2
MSOP-8
G5921
7
VCC
N.C.
GND
LED4
EN


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