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PDF G5520A Data sheet ( Hoja de datos )
| Número de pieza | G5520A | |
| Descripción | Bias Power Supply | |
| Fabricantes | Global Mixed-mode Technology | |
| Logotipo |  |
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Global Mixed-mode Technology
G5520A
Bias Power Supply for TFT LCD Panels
Features
2.5V to 5.5V Input Supply Range
Active-High Enable Control
1.2MHz Current-Mode Boost Regulator
Fast Transient Response to Pulse Load
±1% Accurate Output Voltage
Built-In 20V/1.8A, 0.7Ω N-Channel MOSFET
High Efficiency up to 90%
Over-Current Protection
Output Under-Voltage Protection
High-Performance Operational Amplifier
±150mA Output Short-Circuit Current
12V/μs Slew Rate
12MHz, -3dB Bandwidth
Rail-to-Rail Input and Output
600kHz Negative Charge Pump Driver for VGL
600kHz Positive Charge Pump Driver for VGH
Power-On Sequence Control
Thermal-Overload Protection
TQFN3X3-16 Package
Applications
Photo Frame
GPS
UMPC
General Description
The G5520A includes a high-performance boost regu-
lator, a VCOM buffer (unity gain OPA), a VGH charge
pump driver, and a VGL charge pump driver for ac-
tive-matrix thin-film transistor (TFT) liquid-crystal dis-
plays (LCDs).
The boost converter provides the regulated supply
voltage for the panel source driver ICs. The converter
is a high switching frequency (1.2MHz) current mode
regulator with an integrated 20V N-Channel 0.7Ω
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.
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.
A positive and a negative charge-pump driver provide
adjustable regulated output voltages VGH and VGL to
bias the TFT. Both the charge-pump driver operate
with 600kHz switching frequency.
The G5520A includes internal power-up sequencing,
over/under voltage protections of the boost converter,
and over temperature protection to ensure in safe op-
erating.
The G5520A are available in a 16-pin 3X3TQFN
packages.
Ordering Information
ORDER
NUMBER
MARKING
G5520AR41U 5520A
Note: R4:TQFN3X3-16
1: Bonding Code
U: Tape & Reel
TEMP.
RANGE
-40°C to +85°C
PACKAGE
(Green)
TQFN3X3-16
Pin Configuration
DRVN 1
REF 2
AGND 3
NC 4
Thermal
Pad
12 FB
11 IN
10 LX
9 PGND
Ver: 0.2
Oct 21, 2013
G5520A TQFN3X3-16
Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation.
TEL: 886-3-5788833
http://www.gmt.com.tw
1
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