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Internal-Switch Boost Regulator with Integrated 7-Channel Driver, VCOM Calibrator, Op Amp, and LDO

Single-Chip Power IC with Integrated Level Shifters and Programmable VCOM for Notebook LCD Applications

Product Details

Key Features

Simplified Block Diagram

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Key Features

  • 1.8V to 5.5V IN Supply Voltage Range
  • 450kHz to 1.2MHz Adjustable Frequency Current-Mode Step-Up Regulator
    • Fast-Transient Response
    • Integrated 14V, 2.5A, 150mΩ MOSFET
    • High Efficiency (> 85%)
  • Low-Dropout Linear Regulator
    • High-Accuracy Output Voltage (2.0%)
    • Internal Digital Soft-Start
  • High-Performance Operational Amplifier
    • 200mA Output Short-Circuit Current
    • 45V/µs Slew Rate
    • 20MHz, -3dB Bandwidth
    • Rail-to-Rail Inputs and Outputs
  • High-Voltage Drivers
    • +30V to -10V Outputs
  • I²C Programmable VCOM Calibrator
    • 7-Bit Adjustable Current-Sink Output
    • Nonvolatile IVR Memory
  • Thermal-Overload Protection

Applications/Uses

  • Notebook Computer Displays

Description

The MAX17094 includes a high-performance step-up regulator, a 250mA low-dropout (LDO) linear regulator, a high-speed operational amplifier, a digitally adjustable VCOM calibration device with nonvolatile memory and I²C interface, and seven integrated high-voltage level shifters. The device is optimized for thin-film transistor (TFT) liquid-crystal display (LCD) applications.

The step-up DC-DC converter is a current-mode regulator that provides the regulated supply voltage for panel source driver ICs. The current-mode architecture provides fast-transient responses to pulsed loads typical of source driver loads. The high switching frequency, which is programmable to any frequency between 450kHz to 1.2MHz with a single resistor, allows the use of ultra-small inductors and ceramic capacitors. The step-up regulator’s soft-start time is controlled by an internal 10ms digital timer that requires no external components; or if desired, the soft-start time can be adjusted by adding a single external capacitor.

The low-voltage LDO linear regulator can provide at least 250mA. The output voltage is accurate within ±2%.

The high-voltage, level-shifting scan driver is designed to work with panels that incorporate row drivers on the panel glass. Its seven outputs swing from +30V to -10V and can swiftly drive capacitive loads.

The high-performance op amp is designed to drive the LCD backplane and features 20MHz bandwidth, 45V/µs slew rate, and 150mA output currents.

The programmable VCOM calibrator is externally attached to the VCOM amplifier’s resistive voltage-divider and sinks a programmable current to adjust the VCOM voltage level. An internal 7-bit digital-to-analog converter (DAC) controls the sink current. The DAC is ratiometric relative to AVDD and is guaranteed monotonic over all operating conditions. The calibrator includes a nonvolatile memory device (IVR) to store the desired VCOM voltage level. The 2-wire I²C interface simplifies production equipment.

The MAX17094 is available in a 48-pin, 6mm x 6mm TQFN package with a maximum thickness of 0.8mm for thin LCD panels.

Simplified Block Diagram

MAX17094: Typical Operating Circuit MAX17094: Typical Operating Circuit Zoom icon

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.