Document
19-4445; Rev 0; 2/09 EVAALVUAAILTAIOBNLEKIT
DC-DC Converter with Integrated Scan Driver, VGL Controller, Op Amp, and LDO for TFT LCD
MAX17103/AUO-P1721.14
General Description
The MAX17103 includes a high-performance step-up regulator, a 350mA low-dropout linear regulator, a highspeed operational amplifier, a negative linear regulator controller, and a high-voltage, level-shifting scan driver. The device is optimized for thin-film transistor (TFT) liquid-crystal display (LCD) applications.
The step-up DC-DC converter provides the regulated supply voltage for panel source driver ICs. The high 1.2MHz switching frequency allows the use of ultrasmall inductors and ceramic capacitors. The currentmode control architecture provides fast-transient response to pulsed loads typical of source driver loads. The step-up regulator features an adjustable soft-start and an adjustable cycle-by-cycle current limit.
The high-current operational amplifier is designed to drive the LCD backplane (VCOM). The amplifier features high output current (±200mA), fast slew rate (50V/µs), wide bandwidth (12MHz), and rail-to-rail inputs and outputs.
The low-voltage LDO linear regulator has an integrated 0.8Ω pass element and can provide at least 350mA. The output voltage is accurate within ±1%.
The high-voltage, level-shifting scan driver is designed to drive the TFT panel gate drivers. Its three outputs can swing up to 40V (max) to swiftly drive capacitive loads. To save power, the two complementary outputs are designed to allow charge sharing during state changes.
The MAX17103 is available in a 32-pin, 5mm x 5mm, thin QFN package with a maximum thickness of 0.8mm for thin LCD panels.
Applications
Notebook Computer Displays
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX17103ETJ+
-40°C to +85°C 32 Thin QFN-EP*
AUO-P1721.14
-40°C to +85°C 32 Thin QFN-EP*
+Denotes lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad.
Features
o 2.3V to 5.5V IN Supply Voltage Range
o 1.2MHz Current-Mode Step-Up Regulator Fast-Transient Response High-Accuracy Reference (1%) Integrated 16V, 2A, 200mΩ MOSFET High Efficiency (> 85%) Adjustable Cycle-by-Cycle Current Limit
o High-Performance Operational Amplifier 200mA Output Short-Circuit Current 50V/µs Slew Rate 12MHz, -3dB Bandwidth
o Low-Dropout Linear Regulator High-Accuracy Output Voltage (1.0%)
o High-Voltage Drivers with Scan Logic +35V to -15V Outputs 40V (Max) Swing
o Linear Regulator Controller for Gate-Off Supply
o Thermal-Overload Protection
o 32-Pin, 5mm x 5mm, Thin QFN Package
Simplified Operating Circuit
VVGL VIN
VGHON VMAIN
VLOGIC
VGHON SYSTEM
VVGL
DRVN IN FBN
VGL REF CONTROLLER
ENA LDOADJ
STEP-UP CONTROLLER
LDOO
LINEAR REGULATOR
VDET CD
MAX17103 AUO-P1721.14
LX
PGND FB
COMP SS
AGND OPAS
VOLTAGE DETECTOR RST
OP
OUT
GHON
CK CS XCK ST SCAN
DRIVER LOGIC
POS CKH
QS XCKH
STH
To VCOM BACKPLANE
PANEL
VGLC
VGHON
GD VGL
Pin Configuration appears at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
DC-DC Converter with Integrated Scan Driver, VGL Controller, Op Amp, and LDO for TFT LCD
MAX17103/AUO-P1721.14
ABSOLUTE MAXIMUM RATINGS
IN, RST to AGND ...................................................-0.3V to +7.5V FB, FBN, CD, ENA, VDET, SS, CS, ST,
CK, XCK to AGND...................................-0.3V to (VIN + 0.3V) LDOADJ, LDOO, COMP, REF to AGND ......-0.3V to (VIN + 0.3V) PGND to AGND .....................................................-0.3V to +0.3V LX, OPAS to PGND.................................................-0.3V to +18V DRVN to AGND.............................................-20V to (VIN + 0.3V) GHON to PGND......................................................-0.3V to +40V VGL to PGND ........................................................ -20V to +0.3V GHON to VGL…………………………………………-0.3V to +45V GD to PGND ..........................................-0.3V to (VGHON + 0.3V) GD to VGHON ........................................................-15V to +0.3V
VGLC, STH, CKH, XCKH ........(-0.3V + VVGL) to (VGHON + 0.3V) OUT, POS to PGND ................................-0.3V to (VOPAS + 0.3V) POS to OUT ...........................................................-7.5V to +7.5V OUT Maximum Continuous Output Current......................±75mA GHON, STH, VGL, CKH, and XCKH RMS Current Rating 120mA LX, PGND RMS Current Rating.............................................1.6A Continuous Power Dissipation (TA = +70°C)
32-Pin TQFN (derate 24.9mW/°C above +70°C).......1990mW Operating Temperature Range ...........................-40°C to +85°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65°C to +160°C Lead Temperature (s.