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參數(shù)資料
| 型號： | G5121TP1U |
| 廠商： | Global Mixed-mode Technology Inc. |
| 英文描述： | Fixed Frequency White LED Step-Up Converter |
| 中文描述： | 固定頻率白光LED升壓轉(zhuǎn)換器 |
| 文件頁數(shù)： | 1/10頁 |
| 文件大小： | 556K |
| 代理商： | G5121TP1U |
Ver: 1.3
Nov 13, 2006
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 1F Output Capacitors
19.5V Over Voltage Protection
SOT-23-6 and TSOT-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 and
TSOT-23-6 package.
Ordering Information
ORDER
NUMBER
MARKING
TEMP.
RANGE
PACKAGE
(Pb free)
G5121TB1U
5121x
-40°C ~ +85°C
SOT-23-6
G5121TP1U
5121x
-40°C ~ +85°C
TSOT-23-6
Note:TB: SOT23-6
TP: TSOT-23-6
1: Bonding Code
U: Tape & Reel
Pin Configuration
Typical Application Circuit
VCC
SHDN
SOT-23-6/TSOT-23-6
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
4.7F/6.3V
4.7H
C2
1F/25V
C1:TAIYO YUDEN, JMK212BJ475KD
C2:TAIYO YUDEN, TMK316BJ105KD
G5121
VCC
SHDN
SOT-23-6/TSOT-23-6
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
4.7F/6.3V
4.7H
C2
1F/25V
C1:TAIYO YUDEN, JMK212BJ475KD
C2:TAIYO YUDEN, TMK316BJ105KD
G5121
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| G5122 | 制造商:GMT 制造商全稱:Global Mixed-mode Technology Inc 功能描述:Micro-power Inverting DC/DC Converters in SOT-23-5 |
| G5122T11U | 制造商:GMT 制造商全稱:Global Mixed-mode Technology Inc 功能描述:Micro-power Inverting DC/DC Converters in SOT-23-5 |
| G5125 | 制造商:GMT 制造商全稱:Global Mixed-mode Technology Inc 功能描述: |
| G512521-6K | 制造商:TAIWAN YUN LIN ELECTRONIC CO., 功能描述:BLACK LOWSHRINK 1.6MM ID |
| G51252X25K | 制造商:TAIWAN YUN LIN ELECTRONIC CO., 功能描述:BLACK LOWSHRINK 25.4MM ID |
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