AAT1268A
Features
2.5V to 5.5V Input Operating Voltage Range
Current Mode Boost Regulator Built-in 18V, 2A, 0.25Ω MOSFET 640kHz/1.2MHz Selectable Switch Frequency Programmable Soft-Start
Programmable VCOM Operational Amplifier I2C Interface 7 Bits, 128-Step Adjustable Sink Current Output ±200mA Output Short Circuit 35V/μs Slew Rate
Gate Pulse Modulator Adjustable Power on Delay Time Flicker Compensation
Low Dropout Linear Regulator 500mA (Typical) Output Current Limit
System RESET Output Adjustable Detecting Voltage and Delay Time Open-Drain Output
Protections Over-Voltage Protection Over Temperature Protection
WQFN28 4 x 5 x 0.75 Package
General Description
The AAT1268A is a highly integrated power management IC for TFT LCD panels. The device provides a boost regulator, a low dropout linear regulator, I2C programmable VCOM operational amplifier, gate pulse modulation circuitry, and one open drain reset output for input voltage monitoring, making the AAT1268A an ideal device for use in TFT LCD applications.
The AAT1268A current mode boost regulator accepts an input voltage ranging from 2.5V to 5.5V, and can provide an output voltage of up to approximately 16V. The regulator switches at a fixed frequency (640kHz or 1.2MHz selectable), and integrates a low RDSON (0.25Ω typical) NMOS power switch, thereby minimizing board space while providing good efficiency. Externally programmed soft start minimizes inrushes and output overshoots. The boost also includes protection features such as OCP, OVP, and fault protection.
The low dropout linear regulator typically biases the T-CON circuitry. The LDO guarantees a minimum 300mA output current, and its output voltage is set via external feedback resistors.
The device also integrates a high speed, high output current capable, rail to rail output OP Amp. that supplies VCOM in TFT LCD backplanes.
To improve image quality in LCD applications, an on chip gate pulse modulator shapes the gate high signal, where both the slope and delay time can be externally set.
The AAT1268A is available in a small WQFN 28 pin 4 x 5 x 0.75mm with a bottom side exposed thermal pad to provide optimal heat dissipation. The device is rated to operated from –40°C to +85°C temperature range.
The AAT1268A current mode boost regulator accepts an input voltage ranging from 2.5V to 5.5V, and can provide an output voltage of up to approximately 16V. The regulator switches at a fixed frequency (640kHz or 1.2MHz selectable), and integrates a low RDSON (0.25Ω typical) NMOS power switch, thereby minimizing board space while providing good efficiency. Externally programmed soft start minimizes inrushes and output overshoots. The boost also includes protection features such as OCP, OVP, and fault protection.
The low dropout linear regulator typically biases the T-CON circuitry. The LDO guarantees a minimum 300mA output current, and its output voltage is set via external feedback resistors.
The device also integrates a high speed, high output current capable, rail to rail output OP Amp. that supplies VCOM in TFT LCD backplanes.
To improve image quality in LCD applications, an on chip gate pulse modulator shapes the gate high signal, where both the slope and delay time can be externally set.
The AAT1268A is available in a small WQFN 28 pin 4 x 5 x 0.75mm with a bottom side exposed thermal pad to provide optimal heat dissipation. The device is rated to operated from –40°C to +85°C temperature range.
Application
Tablet PC Panel
Notebook Panel
Notebook Panel