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| 型号： | MAX8798EVKIT+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 1/31页 |
| 文件大小： | 0K |
| 描述： | KIT EVAL FOR MAX8798 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 主要目的： | 特殊用途 DC/DC，LCD 电源 |
| 输出及类型： | 4，非隔离 |
| 功率 - 输出： | 3.56W |
| 输出电压： | 8V，3.2V，21V，-13V |
| 电流 - 输出： | 300mA，150mA，20mA，20mA |
| 输入电压： | 1.8 ~ 6 V |
| 稳压器拓扑结构： | 升压 |
| 频率 - 开关： | 1.2MHz |
| 板类型： | 完全填充 |
| 已供物品： | 板，CD |
| 已用 IC / 零件： | MAX8798 |
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19-0971; Rev 1; 6/08
ATION
EVALU
AVAILA
KIT
BLE
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; an I 2 C 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 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
Features
? 1.8V to 5.5V IN Supply Voltage Range
? 1.8V to 4.0V V DD Input Voltage Range
? 1.2MHz Current-Mode Step-Up Regulator
Fast Transient Response
Built-In 20V, 1.9A, 150m Ω MOSFET
? High-Speed (20MHz) Operational Amplifier
±150mA Output Current
? High-Voltage Drivers with Scan Logic
+45V to -25V Outputs
65V (maximum) Swing
Output Charge Sharing
? Programmable VCOM Calibrator
7-Bit Adjustable Current-Sink Output
I 2 C Interface
EEPROM Setting Memory
? Thermal-Overload Protection
Simplified Operating Circuit
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
VN
VP
monotonic over all operating conditions. The calibrator IC
includes an EEPROM to store the desired VCOM voltage
V IN
50k Ω
SHDN
IN
LX
V MAIN
level. The 2-wire I 2 C interface between the LCD panel
and the programming circuit minimizes panel connector
DISH
lead 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 65V (maximum) between +45V (maximum) and
-25V (minimum) and can swiftly drive capacitive loads.
To save power, the two complementary outputs are
designed to allow charge sharing during state changes.
SYSTEM
VN
CPV
OE
STV
OECON
GOFF
STVP
CKVCS
1k Ω
SCAN DRIVER
LOGIC
AND
GATE DRIVERS
1.9A
STEP-UP
REG
PGND
FB
COMP
AGND
GON
BOOST
VP
The MAX8798 is available in a 36-pin, thin QFN pack-
NEG
age with a maximum thickness of 0.8mm for ultra-thin
PANEL
CKVB
LCD panels.
Applications
CKVBCS
CKV
VCOM
TO VCOM
BACKPLANE
Notebook Computer Displays
LCD Monitor Panels
VL
V DD
3.3V
LINEAR
REG
VCOM CALIBRATOR
POS
BGND
OUT
Ordering Information
VIN
GND
SDA
7
SCL
PART
TEMP RANGE
PIN-
PACKAGE
PKG
CODE
I 2 C
BUS
SCLS
WPP
WPN
SET
MAX8798ETX+ -40°C to +85°C
36 Thin QFN
6mm x 6mm
T-3666M-1
________________________________________________________________ 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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