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G5121 Fiches technique(PDF) 1 Page - Global Mixed-mode Technology Inc

No de pièce G5121
Description  Fixed Frequency White LED Step-Up Converter
Download  9 Pages
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Fabricant  GMT [Global Mixed-mode Technology Inc]
Site Internet  http://www.gmt.com.tw
Logo GMT - Global Mixed-mode Technology Inc

G5121 Fiches technique(HTML) 1 Page - Global Mixed-mode Technology Inc

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Ver: 1.1
Nov 17, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
1
G5121
Global Mixed-mode Technology Inc.
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
TEMP.
RANGE
PACKAGE
(Pb free)
G5121TB1U
5121x
-40°C ~ +85°C
SOT-23-6
Note: TB : SOT23-6
U: Tape & Reel
Pin Configuration
Typical Application Circuit
VCC
SHDN
SOT-23-6
G5121
6
4
1
SW
2
3
GND
FB
5
OVP
VCC
SW
SHDN
FB
GND
G5121
L1
V
IN
2.7V to 4.2V
D1
OVP
5 LEDs
PWM Dimming
Waveform
RS
C1
4.7µF/6.3V
4.7µH
C2
1µF/25V
C1:TAIYO YUDEN, JMK212BJ475KD
C2:TAIYO YUDEN, TMK316BJ105KD
VCC
SHDN
SOT-23-6
G5121
6
4
1
SW
2
3
GND
FB
5
OVP
VCC
SW
SHDN
FB
GND
G5121
L1
V
IN
2.7V to 4.2V
D1
OVP
5 LEDs
PWM Dimming
Waveform
RS
C1
4.7µF/6.3V
4.7µH
C2
1µF/25V
VCC
SHDN
SOT-23-6
G5121
6
4
1
SW
2
3
GND
FB
5
OVP
VCC
SW
SHDN
FB
GND
G5121
L1
V
IN
2.7V to 4.2V
D1
OVP
5 LEDs
PWM Dimming
Waveform
RS
C1
4.7µF/6.3V
4.7µH
C2
1µF/25V
C1:TAIYO YUDEN, JMK212BJ475KD
C2:TAIYO YUDEN, TMK316BJ105KD


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