G5529

G5529
Global Mixed-mode Technology Inc.
Integrated Multi-Channel DC-DC Converter for TFT-LCD Panels
age for the panel source driver ICs. The converter is a
high switching frequency (640kHz or 1.2MHz) currentmode regulator with an integrated 20V N-Channel
0.2Ω MOSFET that allows the use of ultra-small inductors
and ceramic capacitors. It provides fast transient response to pulsed loading while achieving efficiency over
90%. The device can produce output voltage as high as
18V from an input as low as 2.8V. Soft-Start is programmed by external capacitor, which sets the input-current ramp-rate.
Features
„ 2.5V to 5.5V Input Supply Range
„ 640kHz/1.2MHz Current-Mode Boost Regulator
Š Fast Transient Response to Pulse Load
Š ±1% Accurate Output Voltage
Š Built-In 20V/2A, 0.2Ω N-Channel MOSFET
Š High Efficiency up to 90%
Š Programmable Soft-Start
Š Over-Current Protection
Š Output Under-Voltage Protection
„ High-Performance Operational Amplifiers
±150mA Output Short-Circuit Current
Š 12V/µs Slew Rate
Š 12MHz, -3dB Bandwidth
Š Rail-to-Rail Input and Output
„ On-Chip GPM Controller
Š Adjustable Falling Time and Power-On Delay
Š Flicker Compensator
Š Power-On Sequence Control
„ Low Voltage Detector
Š Programmable Detecting Voltage and Delay Time
„ Charge pump for VGH regulation
„ Thermal-Overload Protection
„ RoHs Compliant
„ TQFN4X4-24 Package
The GPM is controlled by frame signals from timing controller to modulate the Gate-On voltage, VGHM, which acts
a flicker compensation circuit to reduce the coupling effect
between gate lines and pixels. It also can delay the
Gate-On voltage while power-on for achieving a corrected
power-on sequence for gate driver ICs. Both of power-on
delay time and the falling time of the Gate-On voltage are
programmable by external capacitor and resistor.
The voltage detector monitors the supply voltage to issue a
reset signal while the detected voltage is too low. The detecting level is decided by an external resistor divider and
the delay time is programmable by an external capacitor.
The VCOM buffer can drive the LCD VCOM voltage that
features high short-circuit current (150mA), fast slew rate
(12V/µs), wide bandwidth (12MHz) and rail-to-rail input/output.
Applications
„ LCD Monitor
„ Notebook Computer Displays
„ LCD TVs
Ordering Information
General Description
ORDER
NUMBER
MARKING
TEMP.
RANGE
PACKAGE
(Green)
G5529R51U
5529
-40°C to 85°C
TQFN4X4-24
Note: R5: TQFN4X4-24
1: Bonding Code
U: Tape & Reel
The G5529 includes a high-performance boost regulator, a
gate pulse modulator (GPM), a voltage detector, and a
VCOM buffer (unity-gain OPA), for activematrix thin-film
transistor (TFT) liquid-crystal displays (LCDs).
The boost converter provides the regulated supply volt-
P GND
N.C.
FB
COMP
N.C.
OP AO
24
23
22
21
20
19
Pin Configuration
LX
1
18
AVDD
VIN
2
17
N.C.
SS
3
16
N.C.
AGND
4
15
VGH
Therm al
Pad
12
V FLK
VDP M 11
10
9
CD
RE SE T
RE
8
VGHM
13
VDIV
14
6
7
5
N.C.
OP AI
FREQ
G5529 TQFN4X4-24
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 0.4
Sep 16, 2009
1