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Global Mixed-mode Technology
Global Mixed-mode Technology


G2523

Integrated LCD Bias Power Supply



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G2523 pdf
Global Mixed-mode Technology
G2523
Integrated LCD Bias Power Supply
Features
„ 2.6V~5.5V Supply Range
„ Current Mode Boost Regulator for AVDD
Š 0.15/20V/3A Embedded NMOS switch
Š Fixed 1.2MHz Switching Frequency
Š Up to 85% Efficiency
Š 1% Output Regulation
„ Voltage Mode Buck-Boost Regulator for VGL
Š Fixed 600kHz Switching Frequency
Š Up to 85% Efficiency
Š 1% Output Regulation
„ Charge Pump Regulator for VGH
„ 3-Channel Rail-to-Rail Unity-Gain Operational
Amplifier
Š ±200mA Output Short Circuit Current
Š 20V/µs Slew Rate
Š 18MHz, -3dB Bandwidth
„ Built-In Power On Sequence and Soft Start
Function
„ Protections:
Š Input Under Voltage Lockout (UVLO)
Š Over Current Protection for AVDD (OCP)
Š Output Under Voltage Protection for AVDD,
VGH and VGL (UVP)
Š Output Over Voltage Protection for AVDD,
VGL (OVP)
Š Operational Amplifier Short Circuit Protection
(SCP)
Š Over Temperature Protection (OTP)
„ QFN5X5-32 Package
„ RoHS Compliant
Applications
„ LCD TV Panel
„ LCD Monitor Panel
General Description
The G2523 includes a high-performance boost regulator,
a buck-boost controller, a high voltage charge pump
regulator, 3 VCOM buffers (unity-gain OPA) for ac-
tive-matrix thin-film transistor (TFT) liquid-crystal dis-
plays (LCDs).
The boost regulator provides the regulated supply
voltage for the panel source driver ICs. It is a high
switching frequency (1.2MHz) current-mode regulator
with an integrated 20V/0.15NMOS switch that al-
lows the use of ultra small inductors and ceramic ca-
pacitors. It provides fast transient response to pulsed
loading while achieving efficiency over 85%. The de-
vice can produce output voltage as high as 18V from
an input as low as 2.8V.
A voltage mode buck-boost controller cooperates with
external temperature sensor provide compensated
gate-off voltage supply to the level shifters. While the
charge pump controller regulates the external charge
pump voltage source to supply for other devices.
The VCOM buffer can drive the LCD VCOM voltage
that features high short-circuit current (200mA), fast
slew rate (20V/µs), wide bandwidth (8MHz) and
rail-to-rail input/output.
The G2523 features extensive protection functions
that include UVLO, OCP, UVP, OVP, and OTP. It is
available in a QFN5X5-32 package.
Ordering Information
ORDER
NUMBER
G2523QA1U
Note: QA: QFN5X5-32
1: Bonding Code
U: Tape & Reel
MARKING
2523
TEMP.
RANGE
-40°C to +85°C
PACKAGE
(Green)
QFN5X5-32
Ver: 0.1
Aug 22, 2013
TEL: 886-3-5788833
http://www.gmt.com.tw
1



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G2523 pdf
Global Mixed-mode Technology
Pin Configuration
G2523
AVIN
VSUP
OPAO3
OPAI3
OPAO2
OPAI2
OPAO1
OPAI1
1
2
3
4
5
6
7
8
Thermal
Pad
24 FBP
23 VREF
22 NTC
21 END
20 DRVN
19 NC
18 COMP2
17 FBN
G2523 QFN5X5-32
Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation.
Typical Application Circuit
Ver: 0.1
Aug 22, 2013
TEL: 886-3-578833
http://www.gmt.com.tw
2



Part Number G2523
Description Integrated LCD Bias Power Supply
Maker Global Mixed-mode Technology - Global Mixed-mode Technology
Total Page 2 Pages
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