G5529 Datasheet, PDF (1/1 Pages) Global Mixed-mode Technology Inc – Integrated Multi-Channel DC-DC Converter for TFT-LCD Panels

Global Mixed-mode Technology Inc.
G5529
Integrated Multi-Channel DC-DC Converter for TFT-LCD Panels
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
Applications
„ LCD Monitor
„ Notebook Computer Displays
„ LCD TVs
General Description
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-
Pin Configuration
age for the panel source driver ICs. The converter is a
high switching frequency (640kHz or 1.2MHz) current-
mode 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 re-
sponse 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 pro-
grammed by external capacitor, which sets the in-
put-current ramp-rate.
The GPM is controlled by frame signals from timing con-
troller 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 de-
tecting 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 in-
put/output.
Ordering Information
ORDER
NUMBER
MARKING
TEMP.
RANGE
G5529R51U
5529
-40°C to 85°C
Note: R5: TQFN4X4-24
1: Bonding Code
U: Tape & Reel
PACKAGE
(Green)
TQFN4X4-24
Ver: 0.4
Sep 16, 2009
LX 1
VIN 2
SS 3
AGND 4
FREQ 5
N.C. 6
Therm al
Pa d
18 AVDD
17 N.C.
16 N.C.
15 VGH
14 VGHM
13 RE
G5529 TQFN4X4-24
1
TEL: [phone]
http://www.gmt.com.tw