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Multiple-Output Power-Supply Controllers for LCD Monitors

Multiple-Output Power-Supply Controllers Generate All the Supply Rails for Thin-Film Transistor (TFT) Liquid-Crystal Display (LCD) Monitors

Product Details

Key Features

Simplified Block Diagram

Technical Docs

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Key Features

  • 4.5V to 28V Input Voltage Range
  • 250kHz/500kHz Current-Mode Step-Down Converter
    • Small Inductor/Capacitors
    • No Sense Resistor
  • Three Positive Linear Regulator Controllers
    • One Positive and One Negative Additional Controller (MAX1531)
    • Small Input and Output Capacitors
  • Timed Reset Output
  • Uncommitted Overcurrent Protection (MAX1531)
  • Soft-Start for All Regulators
  • Programmable Input Undervoltage Comparator
  • Programmable Startup Sequencing

Applications/Uses

  • LCD Monitors and TVs

Description

The MAX1530/MAX1531 multiple-output power-supply controllers generate all the supply rails for thin-film transistor (TFT) liquid-crystal display (LCD) monitors. Both devices include a high-efficiency, fixed-frequency, step-down regulator. The low-cost, all N-channel, synchronous topology enables operation with efficiency as high as 93%. High-frequency operation allows the use of small inductors and capacitors, resulting in a compact solution. The MAX1530 includes three linear regulator controllers and the MAX1531 includes five linear regulator controllers for supplying logic and LCD bias voltages. A programmable startup sequence enables easy control of the regulators.

The MAX1530/MAX1531 include soft-start functions to limit inrush current during startup. An internal step-down converter current-limit function and a versatile overcurrent shutdown protect the power supplies against fault conditions. The MAX1530/MAX1531 use a current-mode control architecture, providing fast load transient response and easy compensation. An internal linear regulator provides MOSFET gate drive and can be used to power small external loads.

The MAX1530/MAX1531 can operate from inputs as high as 28V and are well suited for LCD monitor and TV applications running directly from AC/DC wall adapters. Both devices are available in a small (5mm x 5mm), ultra-thin (0.8mm), 32-pin QFN package and operate over the -40°C to +85°C temperature range.

Simplified Block Diagram

MAX1530, MAX1531: Typical Operating Circuit MAX1530, MAX1531: Typical Operating Circuit Zoom icon

Technical Docs

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.