AAT1176A数据手册AAT中文资料规格书

描述 Description

\tThe AAT1176A device provides a boost regulator, two regulated charge pumps, an operational amplifier, a high voltage switch for gate pulse modulation (GPM), and one open drain reset output, making the device ideal for powering TFT LCD panels.


\tThe current mode boost regulator provides a fast transient response supply voltage for the source driver ICs. It provides an output voltage up to 18V from input voltages ranging from 2.5V to 5.5V. The boost regulator integrates a low RDSON (0.2Ω) N-MOSFET, and operates at a fixed switching frequency of 1.2MHz, thereby minimizing board space while providing good efficiency.   


\tThe positive and negative charge pump regulators provide supply voltages for the TFT LCD’s gate drivers. Both output voltages can be adjusted with external resistive voltage dividers. For improving TFT LCD image quality, a gate pulse modulation circuit shapes the gate-on signal. The slope of the gate-on voltage and GPM power on delay time can be set by external resistor and capacitor.


\tThe operational amplifier drives the LCD backplane (VCOM). This unity-gain buffer is capable of rail-to-rail input and output, ±200mA output short-circuit current, and a 40V/μs slew rate.


\tThe RESET function is used to monitor the device supply voltage. A reset signal is issued via an open drain NMOS when the supply is below a programmable threshold. The threshold is set by external resistors and the delay time is set by an external capacitor.


\tThe AAT1176A regulators feature soft-start to prevent output overshoots and inrushes. Built-in power on sequencing allows for system stability. This device includes various protection features such as input under-voltage lockout (UVLO) and over temperature shutdown. Regulator outputs include overload fault protection.


\tThe AAT1176A is available in a small 4x4x0.9mm, ultra-thin, 24 pin VQFN package with a bottom side exposed thermal pad to provide optimal heat dissipation. The device is rated to operate from –40°C to +85°C ambient temperature range.

特性 Features

• 2.5V to 5.5V Input Voltage Range
• Current Mode Boost Regulator
•▪Built-in 18V, 3A, 0.2Ω N-MOSFET
•▪1.2MHz Fixed Switching Frequency
•▪Fast Load Transition Response
• Positive Charge Pump Regulator
• Negative Charge Pump Regulator
• High Voltage Switch with Gate Pulse Modulation
•▪Adjustable Power On Delay Time
• Operational Amplifier for VCOM Buffer
•▪±200mA Short-Circuit Current
•▪40V/μs Slew Rate
• RESET
•▪Adjustable Detecting Voltage
•▪N-Channel Open-Drain Output
• Soft Start and Power On Sequencing
• Protections
•▪Input Under-Voltage Lockout (UVLO)
•▪Over-Voltage Protection (OVP)
•▪Under Voltage Protection (UVP)
•▪Thermal Shutdown (OTP)
• VQFN24 4 x 4 x 0.9mm Package Available

应用 Application

• LCD Smart PanelLCD Notebook PanelLCD Monitor PanelLCD TV Panel