MAX8798 Datasheet PDF - Maxim Integrated Products
| Part Number | MAX8798 | |
| Description | Internal-Switch Boost Regulator | |
| Manufacturers | Maxim Integrated Products | |
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19-0971; Rev 0; 9/07
EVAALVUAAILTAIOBNLEKIT Internal-Switch Boost Regulator with
Integrated 3-Channel Scan Driver for TFT LCDs
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.
www.DaTtahSehheeigt4hU-.vcoolmtage, 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
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
MAX8798ETX+ -40°C to +85°C 36 Thin QFN
6mm x 6 mm
PKG
CODE
T-3666M-1
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, 150mΩ 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
Simplified Operating Circuit
VP
VN
VIN
SYSTEM
VN
PANEL
VIN
I2C
BUS
50kΩ
SHDN
IN
LX
DISH
CPV
OE
STV
OECON
GOFF
STVP
CKVCS
CKVB
CKVBCS
1kΩ
SCAN DRIVER
LOGIC
AND
GATE DRIVERS
1.9A
STEP-UP
REG
PGND
FB
COMP
AGND
GON
BOOST
NEG
VCOM
CKV
VL 3.3V
VDD
LINEAR
REG
VCOM CALIBRATOR
GND 7
SDA
SCL
SCLS
WPP WPN
POS
BGND
OUT
SET
VMAIN
VP
TO VCOM
BACKPLANE
________________________________________________________________ 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.
|
| |
 
Internal-Switch Boost Regulator with
Integrated 3-Channel Scan Driver for TFT LCDs
ELECTRICAL CHARACTERISTICS (continued)
(VIN = VDD = VSHDN = +3V, circuit of Figure 2, BOOST = 8V, GON = 23V, GOFF = -12V, VPOS = 0V, VNEG = 1.5V, OE = CPV = STV =
OECON = 0V, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Output Slew Rate CKV, CKVB
Without charge sharing,
STV = VDD, CLOAD = 4.7nF, 50
20 40
V/μs
Propagation Delay Between
STV and STVP
CLOAD = 4.7nF
250 450
ns
STVP Output Slew Rate
Charge-Sharing Discharge
Path Resistance
CLOAD = 4.7nF, 50
CKV to CKVCS and
CKVB to CKVBCS
20 40
V/μs
250 400
DISH Discharge Path Resistance GOFF to -3V, DISH = -3V
DISH Turn-On Threshold
Dish falling
STV, CPV, OE Input Low Voltage
STV, CPV, OE Input High Voltage
OECON Input Low Voltage
OECON Input High Voltage
OECON Sink Current
OECON = 5W = VDD
STV, CPV, OE
Input Current
VSTV = VDD or GND,
VCPV = VDD or GND,
VOE = VDD or GND,
VOECON = VDD or GND
CKV, CKVB, STVP Output
Three-State Current
www.DataSheet4U.com
CONTROL INPUTS
VCKV = GON or GOFF, three-state
VCKVB = GON or GOFF, three-state
VCKVCS = GON or GOFF, three-state
VCKVBCS = GON or GOFF, three-state
VSTVP = GON or GOFF, three-state
Input Low Voltage
SHDN
Input High Voltage
SHDN Input Current
SHDN, 1.8V < VIN < 3.0V
SHDN, 3.0V < VIN < 5.5V
SHDN = 0V or 3V
250 500
-1.8 V
0.8 V
1.6 V
1.5 V
2.0 V
0.4 0.8
mA
-1 +1 μA
-1 +1 μA
0.6 V
1.8
V
2.0
-1 +1 μA
ELECTRICAL CHARACTERISTICS
(VIN = VDD = VSHDN = +3V, circuit of Figure 2, BOOST = 8V, GON = 23V, GOFF = -12V, VPOS = 0V, VNEG = 1.5V, OE = CPV = STV =
OECON = 0V, TA = -40°C to +85°C, unless otherwise noted.) (Note 6)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VDD Input Voltage Range
VDD Quiescent Current
VDD Undervoltage Lockout
IN Input Voltage Range
VDD = 3V
VDD rising; typical hysteresis 100mV
(Note 1)
1.8 4.0 V
10 μA
1.75
V
1.8 6.0 V
IN Quiescent Current
IN Undervoltage Lockout
VIN = 3V, VFB = 1.5V, not switching
IN rising; typical hysteresis 100mV
0.1
1.75
mA
V
_______________________________________________________________________________________ 5
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| Information | Total 30 Pages | |
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