G5517

G5517
Global Mixed-mode Technology Inc.
Integrated Power Solution for TFT-LCD
Features
General Description
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2.5V to 5.5V Input Supply Range
1.2MHz Current-Mode Step-Up Converter
Built-In 18V, 3A 0.2Ω n-Channel MOSFET
Charge Pumps for VGON and VGOFF
High Voltage Switch with Adjustable Delay
„ Thermal Overload Protection
„ TQFN4X4-24 Package
The G5517 includes a step-up converter, two charge
pumps, and a high current operational amplifier for TFT
LCD. Also included are a logic-controlled high-voltage
switch with adjustable delay and an open drain output
reset comparator.
Applications
The charge pumps in G5517 regulate TFT gate-on
and gate-off power supplies. The power-on sequence
is controlled by the control logic. The blanking time for
reset function is 163ms (typ.) from startup. The RSTIN
begins to detect voltage below 1.25V afterward. For
more detail information, please refer to the timing
chart.
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The step-up DC/DC converter provides the regulated
power supply for the panel source driver IC. The converter is a high performance current-mode regulator
with operating frequency at 1.2MHz. It also provides
fast transient response and high efficiency.
LCD Monitor Panels
Notebook Computer Displays
LCD TVs
G5517 is available in TQFN4X4-24 package
Ordering Information
ORDER
NUMBER
MARKING
TEMP.
RANGE
PACKAGE
(Green)
5517
-40°C to 85°C
TQFN4X4-24
G5517R51U
Note: R5: TQFN4X4-24
1: Bonding Code
U: Tape & Reel
VGHM
RE
LX
PGND
22
21
20
19
23 VGH
24
DEL
Pin Configuration
POS
1
18
PGND
NEG
2
17
FB
OUT
3
16
COMP
BGND
4
15
RSTIN
SUP
5
14
AGND
DRVP
6
13
VDD
9
10
11
12
FBP
FBN
REF
8
CTL
RST
7
DRVN
Thermal
Pad
G5517 TQFN4X4-24
Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation.
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 1.2
Jan 17, 2011
1