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Internal-Switch Boost Regulator and High-Voltage, Low-Dropout Linear Regulator for TFT LCDs

Highly Integrated Solution for TFT-LCD Power

Product Details

Key Features

Simplified Block Diagram

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Key Features

  • 2.5V to 5.5V Input Supply Range
  • Pin-Programmable 640kHz/1.2MHz Switching Frequency
  • Current-Mode Step-Up Converter
    • Fast-Transient Response to Pulsed Load
    • High-Accuracy Output Voltage (0.8%)
    • Built-In 20V, 4.6A, 0.1Ω n-Channel Power MOSFET
    • Cycle-by-Cycle Current Limit
    • High Efficiency (88%)
  • Programmable Soft-Start
  • High-Performance Operational Amplifier
    • 200mA Output Short-Circuit Current
    • 45V/µs Slew Rate
    • 20MHz -3dB Bandwidth
    • Rail-to-Rail Input and Output
  • High-Voltage LDO
    • High ±0.5% Accuracy
    • 40mA Guaranteed Output Current
  • Logic-Controlled High-Voltage Switch with Adjustable Delay
  • High-Voltage Stress Mode
  • Built-In Sequencing
  • Thermal-Overload Protection
  • Gate Driver for Input-Side True Shutdown™ Switch
  • Logic-Level Shutdown Input
  • Timer-Delayed Fault Shutdown for Boost-Regulator Output

Applications/Uses

  • LCD Monitors
  • LCD TVs

Description

The MAX17115 includes a high-performance step-up regulator, a high-accuracy, high-voltage, low-dropout linear regulator (LDO), a high-performance buffer ampifier, and a logic-controlled high-voltage switch block.

The DC-DC converter is a high-frequency (1.2MHz/640kHz) current-mode step-up regulator with a built-in power MOSFET. It provides fast-transient response to pulsed loads while producing efficiencies over 88%. The built-in power MOSFET allows output voltages as high as 18V from inputs from 2.5V to 5.5V. A programmable soft-start function controls startup inrush currents.

The operational amplifier, typically used to drive the LCD backplane (VCOM), features high-output short-circuit current (200mA), fast slew rate (45V/µs), and wide bandwidth (20MHz). Its rail-to-rail input and output maximize application flexibility. The high-voltage LDO is adjustable and has a high accuracy of ±0.5%. It is typically used to drive a gamma reference divider string. The high-voltage switch control block modulates the shape of the gate-on supply and provides an adjustable delay for power-up sequencing.

The high-voltage stress (HVS) function is used to temporarily increase the source-driver supply voltage of the LCD panel for aging tests. The HVS digital input controls an open-drain internal switch, which is typically used to change the feedback divider of the step-up regulator.

The MAX17115 is available in a lead-free, 32-pin, thin QFN package. The package is a 5mm x 5mm square with a maximum thickness of 0.8mm for 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.