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MAX8798 Datasheet(PDF) 1 Page - Maxim Integrated Products

Part # MAX8798
Description  Internal-Switch Boost Regulator with Integrated 3-Channel Scan Driver for TFT LCDs
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX8798 Datasheet(HTML) 1 Page - Maxim Integrated Products

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General Description
The MAX8798 includes a high-performance, step-up
regulator; a high-speed operational amplifier; a digitally
adjustable VCOM calibration device with nonvolatile
memory and an I2C interface; 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
switching frequency allows the use of ultra-small induc-
tors and ceramic capacitors. The current-mode control
architecture provides fast transient response to pulsed
loads typical of source driver loads. The step-up regu-
lator features soft-start and current limit.
The high-current operational amplifier is designed to
drive the LCD backplane (VCOM). The amplifier fea-
tures high output current (±150mA), fast slew rate
(45V/µs), wide bandwidth (20MHz), and rail-to-rail
inputs and outputs.
The programmable VCOM calibrator is externally
attached to the VCOM amplifier’s resistive voltage-divider
and sinks a programmable current to adjust the VCOM
output-voltage level. An internal 7-bit digital-to-analog
converter (DAC) controls the sink current. The DAC is
ratiometric relative to BOOST and is guaranteed to be
monotonic over all operating conditions. The calibrator IC
includes an EEPROM to store the desired VCOM voltage
level. The 2-wire I2C interface between the LCD panel
and the programming circuit minimizes panel connector
pin count and simplifies production equipment.
The high-voltage, level-shifting scan driver is designed
to drive the TFT panel gate drivers. Its three outputs
swing from +35V (maximum) to -25V (minimum) and
can swiftly drive capacitive loads. To save power, the
two complementary outputs are designed to allow
charge sharing during state changes.
The MAX8798 is available in a 36-pin, thin QFN pack-
age with a maximum thickness of 0.8mm for ultra-thin
LCD panels.
Applications
Notebook Computer Displays
LCD Monitor Panels
Features
o 1.8V to 5.5V IN Supply Voltage Range
o 1.8V to 4.0V VDD Input Voltage Range
o 1.2MHz Current-Mode Step-Up Regulator
Fast Transient Response
Built-In 20V, 1.9A, 150m
Ω MOSFET
o High-Speed (20MHz) Operational Amplifier
±150mA Output Current
o High-Voltage Drivers with Scan Logic
+35V to -25V Outputs
Output Charge Sharing
o Programmable VCOM Calibrator
7-Bit Adjustable Current-Sink Output
I2C Interface
EEPROM Setting Memory
o Thermal-Overload Protection
Internal-Switch Boost Regulator with
Integrated 3-Channel Scan Driver for TFT LCDs
________________________________________________________________
Maxim Integrated Products
1
Ordering Information
SCAN DRIVER
LOGIC
AND
GATE DRIVERS
VMAIN
VIN
VN
VP
TO VCOM
BACKPLANE
SDA
COMP
LX
PGND
BGND
VCOM
POS
NEG
FB
VP
SCL
BOOST
GON
IN
SET
STVP
GOFF
CKVBCS
CKV
SHDN
OECON
STV
OE
CPV
WPN
CKVCS
CKVB
WPP
SCLS
VDD
OUT
I2C
BUS
VIN
SYSTEM
VN
PANEL
VL
3.3V
LINEAR
REG
VCOM CALIBRATOR
7
GND
AGND
1.9A
STEP-UP
REG
DISH
1k
Ω
50k
Ω
Simplified Operating Circuit
19-0971; Rev 0; 9/07
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.
EVALUATION
KIT
AVAILABLE
PART
TEMP RANGE
PIN-
PACKAGE
PKG
CODE
MAX8798ETX+
-40°C to +85°C
36 Thin QFN
6mm x 6 mm
T-3666M-1


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