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MAX8784EVKIT

MAX8784 Evaluation Kit

Product Details

Key Features

Simplified Block Diagram

Technical Docs

Data Sheet MAX8784 Evaluation Kit May 08, 2007

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Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.

Key Features

  • +4.5V to +5.5V Input-Voltage Range
  • Output Voltages
    • +14V Output at 700mA (Step-Up Switching Regulator)
    • +28V Output at 50mA (Positive Charge Pump)
    • -9V Output at 50mA (Negative Charge Pump)
    • Three High-Current Op Amps (±180mA)
  • 1.2MHz Switching Frequency
  • All Output Voltages are Resistor Adjustable
  • Logic-Controlled, High-Voltage Switch
  • High-Voltage Stress Mode for the Step-Up and Positive Charge-Pump Output Voltages
  • Capacitor-Controlled Initial Startup Delay and Positive Charge-Pump Delay
  • Low-Profile Surface-Mount Components
  • Fully Assembled and Tested

Applications/Uses

  • LCD TVs and LCD Monitors

Description

The MAX8784 evaluation kit (EV kit) is a fully assembled and tested surface-mount PCB that provides the voltages and features required for active-matrix, thin-film transistor (TFT) liquid-crystal display (LCD) panels in LCD monitors and LCD TVs. The EV kit contains a step-up switching regulator, a two-stage positive charge pump for the TFT gate-on supply, a single-stage negative charge pump for the TFT gate-off supply, and three high-current op amps. Two capacitor-control delays are available: one to control the initial startup of the step-up, and the other to control the delay between the negative and positive charge pumps. Also included is a logic-controlled, high-voltage switch for the positive gate-driver supply. A high-voltage stress (HVS) mode is provided to increase the step-up and the positive charge-pump output voltages for stress testing the display panel during production. A capacitive dummy load is provided at the high-voltage switch output for ease of testing without a panel attached.

The EV kit operates from a DC supply voltage of +4.5V to +5.5V, as configured. The step-up switching regulator is configured for a +14V output providing at least 700mA. The positive charge pump is configured for a +28V output providing at least 50mA. The negative charge pump is configured for a -9V output providing at least 50mA. The three high-current op amps are each configured for a +7V output that can source or sink 180mA. The high-voltage switch can be controlled by external logic. The EV kit's input voltage range can be lowered to +4V at slightly lower load currents.

The MAX8784 step-up switching regulator operates at 1.2MHz, allowing the use of tiny surface-mount components. The MAX8784 thin QFN package (0.8mm max height), with low-profile external components, allows this circuit to be less than 3mm high.

Simplified Block Diagram

Technical Docs

Data Sheet MAX8784 Evaluation Kit May 08, 2007

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.