MAX1530
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MAX1530

Multiple-Output Power-Supply Controllers for LCD Monitors

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

warning : NOT RECOMMENDED FOR NEW DESIGNS tooltip
warning : NOT RECOMMENDED FOR NEW DESIGNS tooltip
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
Additional Details
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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.

Applications

  • LCD Monitors and TVs

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Software & Part Ecosystem

Evaluation Kits 1

MAX1531EVKIT

Evaluation Kit for the MAX1530/MAX1531

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MAX1531EVKIT

Evaluation Kit for the MAX1530/MAX1531

Evaluation Kit for the MAX1530/MAX1531

Features and Benefits

  • Output Voltages (Input Range = +10.5V to +24V or
    +9.5V to +24V Using Included MAX1522 Circuit)
    +3.3V Output at 1.5A (Step-Down Switching Regulator)
    +2.5V Output at 500mA (Logic-Supply Regulator)
    +10V Output at 500mA (Source-Driver Supply Regulator)
    +9.7V Output at 50mA (Gamma-Reference Regulator)
    +25V Output at 25mA (Positive Charge Pump and Linear Regulator)
    -9V Output at 50mA (Negative Charge Pump and Linear Regulator)
  • +8V to +24V Input Range (Reduced Output Voltages)
  • Resistor-Adjustable Outputs
  • 92% Efficiency (Step-Down Switching Regulator)
  • 250kHz/500kHz Selectable Step-Down Switching Frequency
  • Programmable Power-Up Sequencing
  • Soft-Start for All Outputs
  • Multilevel Protection
    Resistor-Adjustable Input Undervoltage Threshold
    Output Undervoltage Shutdown
    Overcurrent Protection for One Linear Regulator
    Current Limit for the Step-Down Switching Regulator
  • External Step-Up Switching Regulator (MAX1522) Included
  • Also Evaluates the MAX1530 (IC Replacement Required)
  • Low-Profile, Surface-Mount Components
  • Fully Assembled and Tested
  • Product Detail

    The MAX1531 evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board that provides logic and bias power required for liquid crystal display (LCD) monitors. The EV kit contains a step-down switching regulator, a logic-supply linear regulator, a source-driver-supply linear regulator, a gamma-reference linear regulator, a two-stage positive charge pump and linear regulator for the TFT gate-on supply, and a one-stage negative charge pump and linear regulator for the TFT gate-off supply. The source-driver supply, the gamma-reference supply, the gate-on supply, and the gate-off supply can be sequenced in any power-up order. The EV kit also includes a MAX1522 step-up switching regulator to provide a higher output voltage option for the source-driver supply and the gamma reference.

    The EV kit produces the output voltages listed in the features column using a +10.5V to +24V input voltage range. The input range can be reduced to +9.5V if the included MAX1522 step-up regulator circuit is used. If lower output voltages are acceptable, the input range can be further reduced to +8V.

    The EV kit features undervoltage protection for the input, overcurrent protection for the step-down switching regulator, and overload protection for the sourcedrive linear regulator. Operation at 500kHz allows the use of small surface-mount components. The EV kit also evaluates the MAX1530.

    Applications

    • Automotive LCDs
    • LCD Monitors and TVs

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