G2500

G2500
Global Mixed-mode Technology
Integrated Power Supply for TFT-LCD Panels with
1-Channel White LED Driver
Features
General Description
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„
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The G2500 includes a high-performance boost regulator, a VCOM buffer (unity gain OPA), a VGH charge
pump driver, a VGL charge pump driver, and white LED
driver for active-matrix thin-film transistor (TFT) liquid-crystal displays (LCDs).
2.5V to 5.5V Input Supply Range
Active-High Enable Control
1.2MHz Current-Mode Boost Regulator
Š Fast Transient Response to Pulse Load
Š ±1% Accurate Output Voltage
Š Built-In 20V/1.8A, 0.7Ω N-Channel MOSFET
Š High Efficiency up to 90%
Š Over-Current Protection
Š Output Under-Voltage Protection
„ High-Performance Operational Amplifier
Š ±150mA Output Short-Circuit Current
Š 12V/μs Slew Rate
Š 12MHz, -3dB Bandwidth
Š Rail-to-Rail Input and Output
„ 600kHz Negative Charge Pump Driver for VGL
„ 600kHz Positive Charge Pump Driver for VGH
„ White LED Driver
Š 1MHz Switching Frequency
Š 20V/1.2A, 0.3Ω N-channel MOSFET
Š Input Under Voltage Protection
Š Over Current Protection
Š Over Voltage Protection
Š Digital Dimming Control
„ Power-On Sequence Control
„ Thermal-Overload Protection
„ RoHs Compliant
„ TQFN4X4-24 Package
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 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.
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 charge-pump drivers operate with
600kHz switching frequency.
The LED driver automatically regulated supply voltage
for the LED light bars without the need to calculate the
output for different LED types. It also integrates a 20V
n-channel MOSFET that provides high output power.
The low reference voltage minimized the power loss
across the current-setting resistor. An enable input can
be pulsed repeatedly to adjust LED’s brightness. The
boost converter of the LED driver incorporates over
current protection and over voltage protection to ensure safety operation.
Applications
„ Notebook Computer Displays
„ UMPCs
„ Medium Size LCD Panel
The G2500 includes internal power-up sequencing,
over/under voltage protections of the boost converter,
and over temperature protection to ensure in safe operating.
The G2500 is available in a 24-pin 4X4 TQFN package.
Ordering Information
ORDER
NUMBER
MARKING
TEMP.
RANGE
PACKAGE
(Green)
G2500R51U
2500
-40°C to 85°C
TQFN4X4-24
Note: R5: TQFN4X4-24
1: Bonding Code
U: Tape & Reel
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 0.1
Aug 14, 2013
1
G2500
Global Mixed-mode Technology
DRVP
FBP
COMP
FB
VCC
LX
Pin Configuration
24
23
22
21
20
19
NC 1
18 PGND
17 NC
LXB 2
PGNDB 3
16 AVDD
Thermal
PAD
VCCB 4
15 OPAO
8
9
G2500
10
11
12
AGND
AGNDB
7
VREF
13 EN
DRVN
ENB 6
FBN
14 OPAI
FBB
OVP 5
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: 0.1
Aug 14, 2013
2