Analog Devices MAX17014A

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

More information

• Datasheet
• IC product information