G2500 Datasheet, PDF (1/2 Pages) Global Mixed-mode Technology Inc – Integrated Power Supply for TFT-LCD Panels with 1-Channel White LED Driver

Global Mixed-mode Technology
G2500
Integrated Power Supply for TFT-LCD Panels with
1-Channel White LED Driver
Features
„ 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 V_GL
„ 600kHz Positive Charge Pump Driver for V_GH
„ 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
Applications
„ Notebook Computer Displays
„ UMPCs
„ Medium Size LCD Panel
General Description
The G2500 includes a high-performance boost regu-
lator, a V_COM buffer (unity gain OPA), a V_GH charge
pump driver, a V_GL charge pump driver, and white LED
driver for active-matrix thin-film transistor (TFT) liq-
uid-crystal displays (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 V_COM buffer can drive the LCD V_COM 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 V_GH and V_GL 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 en-
sure safety operation.
The G2500 includes internal power-up sequencing,
over/under voltage protections of the boost converter,
and over temperature protection to ensure in safe op-
erating.
The G2500 is available in a 24-pin 4X4 TQFN package.
Ordering Information
ORDER
NUMBER
G2500R51U
Note: R5: TQFN4X4-24
1: Bonding Code
U: Tape & Reel
Ver: 0.1
Aug 14, 2013
MARKING
2500
TEMP.
RANGE
-40°C to 85°C
1
PACKAGE
(Green)
TQFN4X4-24
TEL: [phone]
http://www.gmt.com.tw