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MAX17126, MAX17126A

Multi-Output Power Supplies with VCOM Amplifier and High-Voltage Gamma Reference for LCD TVs

Highly Integrated IC LCD TV Power Supplies with Gamma References and VCOM Op Amp Minimize Space and Cost

Product Details

Key Features

Simplified Block Diagram

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Key Features

  • 8.0V to 16.5V IN Supply-Voltage Range
  • Selectable Frequency (500kHz/750kHz)
  • Current-Mode Step-Up Regulator
    • Fast Load-Transient Response
    • High-Accuracy Output Voltage (1.0%)
    • Built-In 20V, 4.2A, 100mΩ MOSFET
    • High Efficiency
    • Adjustable Soft-Start
    • Adjustable Current Limit
    • Low Duty-Cycle Operation (13.2VIN - 13.5V AVDD)
  • Current-Mode Step-Down Regulator
    • Fast Load-Transient Response
    • Built-In 20V, 3.2A, 100mΩ MOSFET
    • High Efficiency
    • 3ms Internal Soft-Start
  • Adjustable Positive Charge-Pump Regulator
  • Adjustable Negative Charge-Pump Regulator
  • Integrated High-Voltage Switch with Adjustable Turn-On Delay
  • High-Speed Operational Amplifier
    • ±200mA Short-Circuit Current
    • 45V/µs Slew Rate
  • High-Accuracy Reference for Gamma Buffer
    • ±1% Feedback Voltage
    • Up to 30mA Load Current
    • Low-Dropout Voltage 0.5V at 60mA
  • External p-Channel Gate Control for AVDD Sequencing
  • PGOOD Comparator
  • Input Undervoltage Lockout and Thermal-Overload Protection
  • 48-Pin, 7mm x 7mm, Thin QFN Package

Applications/Uses

  • LCD TV Panels

Description

The MAX17126/MAX17126A generate all the supply rails for thin-film transistor liquid-crystal display (TFT LCD) TV panels operating from a regulated 12V input. They include a step-down and a step-up regulator, a positive and a negative charge pump, an operational amplifier, a high-accuracy high-voltage gamma reference, and a high-voltage switch control block. The MAX17126/MAX17126A can operate from input voltages from 8V to 16.5V and is optimized for an LCD TV panel running directly from 12V supplies.

The step-up and step-down switching regulators feature internal power MOSFETs and high-frequency operation allowing the use of small inductors and capacitors, resulting in a compact solution. The step-up regulator provides TFT source driver supply voltage, while the step-down regulator provides the system with logic supply voltage. Both regulators use fixed-frequency current-mode control architectures, providing fast load-transient response and easy compensation. A current-limit function for internal switches and output-fault shutdown protects the step-up and step-down power supplies against fault conditions. The MAX17126/MAX17126A provide soft-start functions to limit inrush current during startup. In addition, the MAX17126/MAX17126A integrate a control block that can drive an external p-channel MOSFET to sequence power to source drivers.

The positive and negative charge-pump regulators provide TFT gate-driver supply voltages. Both output voltages can be adjusted with external resistive voltage-dividers. A logic-controlled, high-voltage switch block allows the manipulation of the positive gate-driver supply.

The MAX17126/MAX17126A include one high-current operational amplifier designed to drive the LCD back-plane (VCOM). The amplifier features high output current (±200mA), fast slew rate (45V/µs), wide bandwidth (20MHz), and rail-to-rail outputs.

Also featured in the MAX17126/MAX17126A is a high-accuracy, high-voltage adjustable reference for gamma correction.

The MAX17126/MAX17126A are available in a small (7mm x 7mm), ultra-thin (0.8mm), 48-pin thin QFN package and operate over the -40°C to +85°C temperature range.

Simplified Block Diagram

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 .