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Internal-Switch Boost Regulator with Integrated Scan Driver, VCOM Calibrator, and Op Amp for TFT LCDs

Integrated PMIC Provides Small, Low-Cost Solution for GIP LCD Panels

Product Details

Key Features

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Key Features

  • 2.5V to 6V Input Supply Range
  • 1.2MHz Current-Mode Step-Up Converter
    • Fast Transient Response to Pulsed Load
    • High-Accuracy Output Voltage (1%)
    • Built-In 20V, 3A, 0.16Ω n-Channel Power MOSFET
    • Cycle-by-Cycle Current Limit
    • High Efficiency (87%)
  • Three High-Performance Operational Amplifiers
    • 200mA Output Short-Circuit Current
    • 45V/µs Slew Rate
    • 20MHz, -3dB Bandwidth
    • Rail-to-Rail Inputs and Outputs
  • Linear Regulator for Gate-On and Gate-Off Supply
  • Two Logic-Controlled High-Voltage Switches with Adjustable Delay
  • Programmable VCOM Calibrator
    • 7-Bit Adjustable Current-Sink Output
    • Serial Interface
    • Nonvolatile Setting Memory
  • Six Independent Level-Shifting Scan Drivers
  • Built-In Sequencing
  • Soft-Start and Timer-Delayed Fault Latch for All Regulator Outputs
  • Thermal-Overload Protection
  • Gate Driver for External Input-Side Series MOSFET

Applications/Uses

  • LCD Monitors
  • LCD TVs

Description

The MAX17100 includes a high-voltage step-up regulator, three high-performance operational amplifiers, two linear regulators, two high-voltage switch control blocks for gate-driver supply modulation, a digital VCOM calibrator, and six independent scan drivers.

The DC-DC converter is a 1.2MHz current-mode stepup regulator with a built-in power MOSFET and provides the regulated supply voltage for the panel source driver ICs. The built-in power MOSFET allows output voltages to be as high as 18V from inputs of 2.5V to 6V. A built-in 7-bit digital soft-start function limits inrush currents during startup. The step-up regulator provides fast transient response to pulsed loads while producing efficiencies over 87%.

Three operational amplifiers, typically used as the gamma correction divider string, are configured as unity-gain buffers and feature high output short-circuit current (200mA), fast slew rate (45V/µs), and wide bandwidth (20MHz). Their rail-to-rail inputs and outputs maximize application flexibility.

Two linear regulators provide regulated gate-on and gate-off supplies for TFT panel. The two high-voltage switch control blocks modulate the shape of the gate-on supply with adjustable startup delay.

One operational amplifier is designed to drive the LCD backplane (VCOM). It features high short-circuit current of 200mA. The programmable VCOM calibrator adjusts the VCOM output-voltage level through serial interface by sinking a programmable current from the VCOM resistor-divider. The calibrator includes nonvolatile memory cells that store the desired VCOM voltage level.

The six independent high-voltage level-shifting scan drivers are designed to drive the TFT panel gate lines. The outputs swing from +35V (maximum) to -15V (minimum) and can swiftly drive capacitive loads.

The MAX17100 is available in a lead-free, 48-pin, thin QFN package with 0.4mm lead spacing. The package is a 6mm x 6mm square with a maximum thickness of 0.8mm for ultra-thin LCD panel design.

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 .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.