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PDF G5121 Data sheet ( Hoja de datos )
| Número de pieza | G5121 | |
| Descripción | Fixed Frequency White LED Step-Up Converter | |
| Fabricantes | Global Mixed-mode Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de G5121 (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
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Global Mixed-mode Technology Inc.
G5121
Fixed Frequency White LED Step-Up Converter
Features
Inherently Matched LED Current
High Efficiency: 87%
Drives Up to Five LEDs from 2.5V Supply
24V Internal Power Switch
Fast 1MHz Switching Frequency
Uses Tiny 1mm Tall Inductors
Requires Only 1µF Output Capacitors
19.5V Over Voltage Protection
SOT-23-6 Package
Applications
White LED Backlight Display for PDA
Pocket PC
Smart Phones
Handheld Devices
Cellular Phones
General Description
The G5121 is a step-up DC/DC converter specifically
designed to drive up to 5 series white LEDs with con-
stant current. Series connection of the LEDs provides
identical LED currents resulting in uniform brightness
and eliminates the need for ballast resistors. The
G5121 switches at 1MHz, allowing the use of tiny ex-
ternal components. A low 0.254V feedback voltage
minimizes power loss in the current setting resistor for
high efficiency. The OVP pin monitors the output volt-
age and turns off the converter whenever the LEDs
are open.
The G5121 is available in low profile SOT-23-6 pack-
age.
Ordering Information
ORDER
NUMBER
MARKING
G5121TB1U
5121x
Note: TB : SOT23-6
U: Tape & Reel
TEMP.
RANGE
-40°C ~ +85°C
PACKAGE
(Pb free)
SOT-23-6
Pin Configuration
Typical Application Circuit
SW 1
6 VCC
GND 2
G5121
5 OVP
FB 3
SOT-23-6
4 SHDN
VIN
2.7V to 4.2V
C1
4.7µF/6.3V
PWM Dimming
Waveform
L1 D1
4.7µH
VCC
SW
OVP
G5121
SHDN
FB
GND
C2
1µF/25V
5 LEDs
RS
C1:TAIYO YUDEN, JMK212BJ475KD
C2:TAIYO YUDEN, TMK316BJ105KD
Ver: 1.1
Nov 17, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
1
1 page  
Global Mixed-mode Technology Inc.
Typical Performance Characteristics (continued)
G5121
90
80
70
60
50
40
30
20
10
0
Efficiency vs. Load Current
VIN=2.7V
VIN=3.6V VIN=4.2V
3LEDs, CO=1µF
5 10 15 20
Load Current (mA)
25
90
80
70
60
50
40
30
20
10
0
Efficiency vs. Load Current
VIN=2.7V
VIN=3.6V VIN=4.2V
2LEDs, CO=1µF
5 10 15 20
Load Current (mA)
25
130
120
110
100
90
80
70
60
50
40
30
20
10
0
2
IQ_NoSW vs. Input Voltage
2.5 3 3.5 4 4.5 5 5.5
Input Voltage (V)
6
100
90
80
70
60
50
40
30
20
10
0
-40
IQ_NoSW vs. Temperature
-20 0 20 40 60 80
Temperature (°C)
100
Frequency vs. Input Voltage
1
0.95
0.9
0.85
0.8
0.75
0.7
2 2.5 3 3.5 4 4.5 5 5.5 6
Input Voltage (V)
1.1
1.05
1
0.95
0.9
0.85
0.8
0.75
0.7
-40
Frequency vs. Temperature
-20 0 20 40 60 80
Temperature (°C)
100
Ver: 1.1
Nov 17, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet G5121.PDF ] | |
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