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Maxim Integrated MAX17014A

Low-Cost Multiple-Output Power Supply for LCD TVs

Overview

TopologyBuck Converter
Input voltage12 V
Switching frequency600-1200 kHz
Output 13.3 V / 2 A

Description

The MAX17014A multiple-output power-supply controller generates all the supply rails for thin-film transistor (TFT) liquid-crystal display (LCD) panels in TVs and monitors operating from a regulated 12V input. It includes a step-down and a step-up regulator, a positive and a negative charge pump, two operational amplifiers, and a Dual Mode™ logic-controlled highvoltageswitch control block. The MAX17014A can operate from 8V to 16.5V input voltages and is optimized for LCD TV panel and LCD monitor applicationsrunning directly from 12V supplies.The step-up and step-down regulators feature internal power MOSFETs and high-frequency operation allowing the use of small inductors and capacitors, resulting in a compact solution. Both switching regulators usefixed-frequency current-mode control architectures, providing fast load-transient response and easy compensation. A current-limit function for internal switches and output-fault shutdown protect the step-up andstep-down power supplies against fault conditions. The MAX17014A provides soft-start functions to limit inrush current during startup. The MAX17014A provides adjustable power-up timing.The positive and negative charge-pump regulators provide TFT gate driver supply voltages. Both output voltages can be adjusted with external resistive voltage-dividers. The switch control block allows the manipulation of the positive TFT gate driver voltage.The MAX17014A includes two high-current operational amplifiers designed to drive the LCD backplane (VCOM). The amplifier features high output current (±150mA), fast slew rate (100V/µs), wide bandwidth (20MHz), and rail-to-rail inputs and outputs. A series p-channel MOSFET is integrated to sequence power to AVDD after the MAX17014A has proceeded throughnormal startup, and provides True Shutdown™.The MAX17014A is available in a small (7mm x 7mm),low-profile (0.8mm), 48-pin thin QFN package and operates over a -40°C to +85°C temperature range

Features

  • Optimized for 10.8V to 13.2V Input Supply
  • 8V to 16.5V Input Supply Range
  • Selectable Frequency (600kHz/1.2MHz)
  • Current-Mode Step-Up RegulatorBuilt-In 20V, 3.7A, 110mΩn-Channel MOSFETHigh-Accuracy Output Voltage (1%)True ShutdownFast Load-Transient ResponseHigh Efficiency3ms Internal Soft-Start
  • Current-Mode Step-Down RegulatorBuilt-In 20V, 2.5A, 120mΩn-Channel MOSFETFast Load-Transient ResponseAdjustable Output Voltage Down to 1.25VSkip Mode at Light LoadHigh Efficiency3ms Internal Soft-Start
  • Adjustable Positive and Negative Charge-Pump Regulators
  • Soft-Start and Timer-Delay Fault Latch for All Outputs
  • Logic-Controlled High-Voltage Integrated Switches with Adjustable Delay
  • Two High-Speed Operational Amplifiers±150mA Short-Circuit Current100V/µs Slew Rate20MHz, -3dB Bandwidth
  • 120mΩp-Channel FET for AVDD Sequencing
  • Input Undervoltage Lockout and Thermal-Overload Protection
  • 48-Pin, 7mm x 7mm Thin QFN Package

Typical applications

  • LCD Monitor Panels
  • LCD TV Panels

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