Maxim MAX8784 TFT-LCD电源解决方案电源解决方案
Maxim 公司的MAX8784是TV和监视器的TFT-LCD电源解决方案，包括升压稳压器，调整的正和负电荷泵，三
个大电流运输放大器，以及双模式逻辑控制高压开关控制区块。输入电压4V-5.5V。效率高达90%，开关频率
1.2MHz，主要用在LCD TV和LCD 监视器。本文介绍了MAX8784主要特性，方框图，典型工作电路图和所用元
件列表，MAX8784评估板主要特性，电路图和评估板元件列表。
Maxim 公司的
The MAX8784 generates supply rails for the thin-film transistor (
The step-up DC-DC regulator provides a regulated supply voltage for TFT source drivers. The step-up regulator is a high-
frequency (1.2MHz), high-efficiency, currentmode regulator. The step-up regulator has a built-in 110m(typ) power
MOSFET. The high-switching frequency allows the use of ultra-small inductors and ceramic capacitors. The current-mode
architecture provides fast transient response and easy compensation.
The step-up regulator features output undervoltage protection, soft-start, internal current limit, and adjustable output voltage
by an external resistive divider.
The three operational amplifiers drive the LCD backplane and the gamma-correction-divider string. Each operational
amplifier has a fast slew rate (45V/μs), a wide bandwidth (20MHz), and a high-output short-circuit current (200mA). Each op
amp has rail-to-rail input and rail-to-rail output operation.
The positive charge-pump regulator and the negative charge-pump regulator provide regulated supply voltages for the TFT
gate drivers. The positive charge pump is a two-stage charge pump, which requires no external diodes. The output voltages
of both charge pumps are resistor adjustable. The logic-controlled high-voltage switch allows the manipulation of the
positive TFT gate-driver supply.
The MAX8784 is available in a small (5mm x 5mm), lowprofile (0.8mm), 40-pin TQFN package and operates over the -40℃
to +85℃ temperature range.
MAX8784主要特性：
_ Step-Up Regulator Supply for LCD Panel Source Driver
Fast Transient Response to Pulsed Load
Built-In 18V, 4A, 0.11n-Channel Power MOSFET with Lossless Current Sensing
Cycle-by-Cycle Current-Limit Comparator 90% Efficiency (5V In to 15V Out)
1.2MHz Switching Frequency
_ Three High-Current 19V Operational Amplifiers
180mA Output Short-Circuit Current
45V/μs Slew Rate
20MHz Bandwidth
Rail-to-Rail Input and Output Operation
_ Regulated Charge-Pump Tripler with Integrated Diodes for TFT Gate-On Supply
_ Regulated Charge Pump for TFT Gate-Off Supply
_ Built-In Sequencing Internal Digital Soft-Start
36V Gate-On Switch
Startup Timing Capacitors for AVDD and GON
_ Undervoltage and Thermal Protection
_ 4V to 5.5V Input Operating Range
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