Global Mixed-mode Technology Inc.
AT1739
LCD Panel Step- up Converter with Analog Multi-
Function Outputs
Features
2.6V to 5.5V Input Supply Range
640kHz/1.2MHz Current-Mode PWM Step-Up
Regulator:
Fast Transient Response
1.0% High-Accuracy Output Voltage
Built-In 18V, 2.0A, 0.2Ω N-Channel MOSFET
Programmable Soft-Start
Current-Limit
Latched Fault Protection with Timer
High Efficiency
Gate-On Charge Pump Regulator Controller
with Latched Fault Protection with Timer
High-Performance Linear Regulator:
1.5% Output Accuracy
Works with Small Ceramic Output Capacitors
Fast Transient Response
Foldback Current Limit
High-Current Operational Amplifier:
±150mA
Output Short-Circuit Current
13V/µs Slew Rate
12MHz, -3dB Bandwidth
Rail-to-Rail Input/Output
Gate-on Pulse Modulator with Adjustable Delay
for Sequence Control
Voltage Detector with Adjustable Delay
General Description
The AT1739 offers a complete power-supply solution
for TFT LCD panels used in LCD monitors and NB LCD
panels. The AT1739 consists of a high-performance
step-up converter, a low-power charge-pump regulator,
a high-performance linear regulator, an operational
amplifier, a voltage detector and a logic-controlled
gate-on pulse modulator.
The step-up DC-DC converter provides the regulated
supply voltage for the panel source driver ICs. The
charge-pump regulator generates the positive gate-on
supply voltage. The operational amplifier supplies the
VCOM buffer with high output current, fast slew rate and
wide bandwidth performances for driving capacitive loads.
The high-voltage gate-on pulse modulator to control
the positive gate-on output voltage waveform for
reducing the flicker on TFT LCD panel.
The high-performance linear regulator uses an internal
P-channel MOSFET to supply load currents up to 350mA.
It provides the regulated supply voltage for the TCON IC.
The voltage detector with adjustable detected
voltage-point and delay-time monitors the input supply
voltage to prevent the improper shutdown of the
system power application.
The AT1739 is available in a 24-pin thin QFN package
which is 4mm x 4mm with a maximum thickness of
0.8mm for ultra-thin LCD panel design.
Applications
LCD Monitor Panel Modules
NB LCD Panel Modules
Automotive Displays
Ordering Information
ORDER
NUMBER
AT1739R51U
MARKING
A1739
TEMP.
RANGE
-40°C to 85°C
PACKAGE
(Green)
TQFN4X4-24
Note: R5: TQFN4X4-24
1 : Bonding Code
U: Tape & Reel
P OS OP
20
O UTOP
19
Pin Configuration
23
21
24
22
CO MP
PG ND
FRE Q
FB
LX
IN
SS
A GND
FBL
O UTL
1
2
3
4
5
6
10
DL P 1 1
12
7
8
9
Thermal
Pad
18
17
16
15
14
13
VDD
DRVP
FBP
VP SRC
GON
DRN
V SE N
PG
DL VD
AT1739 TQFN4X4-24
SWCTL
INL
Ver: 0.2
Dec 04, 2008
TEL: 886-3-5788833
http://www.gmt.com.tw
1
GMT [ GLOBAL MIXED-MODE TECHNOLOGY INC ]
