MAX17114

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

Highly Integrated LCD TV Power Supply with Gamma Reference and VCOM Op Amp Minimizes Space and Cost


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Description

The MAX17114 generates all the supply rails for thin-film transistor liquid-crystal display (TFT LCD) TV panels operating from a regulated 12V input. It includes 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 MAX17114 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 MAX17114 provides soft-start functions to limit inrush current during startup. In addition, the MAX17114 integrates 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 MAX17114 includes one high-current operational amplifier designed to drive the LCD backplane (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 MAX17114 is a high-accuracy, high-voltage adjustable reference for gamma correction.

The MAX17114 is available in a small (7mm x 7mm), ultra-thin (0.8mm), 48-pin, TQFN-EP package and operates over the -40°C to +85°C temperature range.
MAX17114: Typical Operating Circuit MAX17114: Typical Operating Circuit Enlarge+

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, 3.5A, 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, 120mΩ 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
    • ±0.5% Feedback Voltage
    • Up to 30mA Load Current
    • Low-Dropout Voltage 0.5V at 60mA
  • External p-Channel Gate Control for AVDD Sequencing
  • XAO Comparator
  • Input Undervoltage-Lockout and Thermal-Overload Protection
  • 48-Pin, 7mm x 7mm, Thin QFN Package

Applications/Uses

  • LCD TV Panels

Quality and Environmental Data

Product Reliability Reports: MAX17114.pdf 
Lead-Free Package Tin (Sn) Whisker Reports
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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