19-ꢁꢁ2ꢀ; Rev 1; ꢀꢂ09
Internal-Switch Boost Regulator with
High-Voltage Level Shifter for TFT LCDs
MAX1708
General Description
Features
o 1.8V to 5.5V IN Supply Voltage Range
o 1.8V to 4.0V V Input Voltage Range
The MAX17088 includes a high-performance, step-up
regulator; a high-speed operational amplifier; a digitally
adjustable VCOM calibration device with nonvolatile
memory; an I2C interface; and a high-voltage, level-shift-
ing scan driver. The device is optimized for thin-film
transistor (TFT) liquid-crystal display (LCD) applications.
The MAX17088 is the successor to the MAX8798.
DD
o 1.2MHz Current-Mode Step-Up Regulator
Fast Transient Response
High-Accuracy Output Voltage (1.5%)
Built-In 20V, 1.9A, 150mΩ MOSFET
High Efficiency (> 85%)
Digital Soft-Start
The step-up DC-DC converter provides the regulated
supply voltage for panel source driver ICs. The convert-
er is a 1.2MHz current-mode regulator with an integrat-
ed 20V n-channel power MOSFET. The high switching
frequency allows the use of ultra-small inductors and
ceramic capacitors. The current-mode control architec-
ture provides fast transient response to pulsed loads
typical of source driver loads. The step-up regulator
features soft-start and current limit.
o High-Speed (20MHz) Operational Amplifier
150mA Output Current
40V/µs Slew Rate
o High-Voltage Drivers with Scan Logic
+45V to -25V Outputs
Output Charge Sharing
o Programmable VCOM Calibrator
7-Bit Adjustable Current-Sink Output
I2C Interface
The high-current operational amplifier is designed to drive
the LCD backplane (VCOM). The amplifier features high
output current ( 1ꢀ0mA), fast slew rate (ꢁꢀVꢂ/s), wide
bandwidth (20MHz), and rail-to-rail inputs and outputs.
MTP Adjustment Memory
o Thermal-Overload Protection
Simplified Operating Circuit
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 MTP to store the desired VCOM voltage
level. The 2-wire, I2C interface between the LCD panel
and the programming circuit minimizes panel connector
lead count and simplifies production equipment.
VP
VN
V
IN
V
MAIN
50kΩ
IN
SHDN
LX
DISH
PGND
FB
1.9A
STEP-UP
REG
1kΩ
CPV
OE
COMP
SCAN DRIVER
LOGIC
AND
SYSTEM
The high-voltage, level-shifting scan driver is designed
to drive the TFT panel gate drivers. Its three outputs
swing 6ꢀV (maximum) between +ꢁꢀV (maximum) and
-2ꢀV (minimum) and can swiftly drive capacitive loads.
To save power, the two complementary outputs are
designed to allow charge sharing during state changes.
STV
OECON
GATE DRIVERS
AGND
GON
GOFF
STVP
VN
VP
BOOST
NEG
CKVCS
PANEL
The MAX17088 is available in a 36-pin (6mm x 6mm),
thin QFN package with a maximum thickness of 0.8mm
for ultra-thin LCD panels.
CKVB
VCOM
TO VCOM
CKVBCS
BACKPLANE
CKV
VL
POS
Applications
3.3V
LINEAR
REG
BGND
V
DD
Notebook Computer Displays
OUT
VCOM CALIBRATOR
7
GND
LCD Monitor Panels
V
IN
SDA
SCL
Ordering Information
2
I C
SCLS
WPP
BUS
WPN
SET
PART
TEMP RANGE
PIN-PACKAGE
MAX17088ETX+
-40°C to +85°C
36 Thin QFN-EP*
MAX17088
+Denotes a lead(Pb)-freeꢂRoHS-compliant package.
*EP = Exposed pad.
________________________________________________________________ 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.
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