
Ver: 0.2 Preliminary
Mar 21, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
1
G5122
Global Mixed-mode Technology Inc.
Micro-power Inverting DC/DC Converters in SOT-23-5
Features
Configurable Output Voltage Up to -30V
20A Quiescent Current
<1A Shutdown Current
<1A Shutdown Pin Current
Supply Range from 2.5V to 6.5V
Low RDS(ON): 0.8Ω
Tiny SOT23-5 Package
Applications
STN/TFT LCD Bias
Personal Digital Assistants (PDAs)
Handheld Computers
Digital Still Cameras
Cellular Phones
Web Pad
General Description
The G5122 inverting DC/DC converter is designed for
small/ medium size LCD panel of high bias voltage.
Due to a typical 20A quiescent current and 2.5V~
6.5V supply voltage range, it is suitable for battery
powered portable applications. Such as PDAs and
Handheld Computers. When the IC sets to shutdown
mode, it only consumes less than 1A.
Furthermore, the 350mA current limit, 500ns fixed
minimum off-time and tiny SOT23-5 package facili-
tates the use of smaller inductor and other sur-
face-mount components to minimize the PCB size in
those space-conscious applications.
To control the IC, no other external current is needed
for the shutdown pin. It typically consumes less than
1A of full supply range.
Ordering Information
ORDER
NUMBER
ORDER NUMBER
(Pb free)
MARKING
TEMP.
RANGE
PACKAGE
G5122T11U
G5122T11Uf
5122x
-40°C ~ +85°C
SOT-23-5
Pin Configuration
Typical Application Circuit
G963
VCC
SHDN
SOT23-5
G5122
5
4
1
SW
2
3
GND
FBN
VCC
SW
SHDN
FB
GND
G5122
10F
4.7F
10H
V
IN
2.5V to 4.2V
47PF
-28V
0.1F
10H
15k
316k
*
* option
G963
VCC
SHDN
SOT23-5
G5122
5
4
1
SW
2
3
GND
FBN
VCC
SW
SHDN
FB
GND
G5122
10F
4.7F
10H
V
IN
2.5V to 4.2V
47PF
-28V
0.1F
10H
15k
316k
*
* option