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MAX8795A
TFT-LCD DC-DC Converter with Operational Amplifiers

TFT LCD, DC-DC Converter with a High-Performance Step-Up Regulator, Two Linear-Regulator Controllers, and High-Current Operational Amplifiers for Active-Matrix, Thin-Film Transistor (TFT) LCDs


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Status
Active: In Production.

Description
FULL DATA SHEET (PDF, 488kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail
The MAX8795A includes a high-performance step-up regulator, two linear-regulator controllers, and five high-current operational amplifiers for active-matrix, thin-film transistor (TFT), liquid-crystal displays (LCDs). Also included is a logic-controlled, high-voltage switch with adjustable delay.

The step-up DC-DC converter provides the regulated supply voltage for the panel source driver ICs. The converter is a high-frequency (1.2MHz) current-mode regulator with an integrated 20V n-channel MOSFET that allows the use of ultra-small inductors and ceramic capacitors. It provides fast transient response to pulsed loads while achieving efficiencies over 85%.

The gate-on and gate-off linear-regulator controllers provide regulated TFT gate-on and gate-off supplies using external charge pumps attached to the switching node. The MAX8795A includes five high-performance operational amplifiers. These amplifiers are designed to drive the LCD backplane (VCOM) and/or the gamma-correction divider string. The device features high output current (±130mA), fast slew rate (45V/µs), wide bandwidth (20MHz), and rail-to-rail inputs and outputs.

The MAX8795A is available in a lead-free, 32-pin, thin QFN package with a maximum thickness of 0.8mm for ultra-thin LCD panels, as well as in a 32-pin LQFP package with 0.8mm pin pitch.

An evaluation kit is available:  MAX8795AEVKIT  

Key Features   Applications/Uses
  • 2.5V to 5.5V Input Supply Range
  • 1.2MHz Current-Mode Step-Up Regulator
    • Fast Transient Response to Pulsed Load
    • High-Accuracy Output Voltage (1%)
    • Built-In 20V, 3A, 0.16Ω n-Channel MOSFET
    • High Efficiency (85%)
  • Linear-Regulator Controllers for VGON and VGOFF
  • High-Performance Operational Amplifiers
    • ±130mA Output Short-Circuit Current
    • 45V/µs Slew Rate
    • 20MHz, -3dB Bandwidth
    • Rail-to-Rail Inputs/Outputs
  • Logic-Controlled, High-Voltage Switch with Adjustable Delay
  • Timer-Delay Fault Latch for All Regulator Outputs
  • Thermal-Overload Protection
  • 0.6mA Quiescent Current

 
  • Automotive Displays
  • LCD Monitor Panels
  • Notebook Computer Displays

    Key Specifications:  Multifunction PMICs
    Part Number Primary Topology Monitor/Control Features DC-DC/Power Features LCD/LED/Flash/CCD Features VIN
    (V)
    VIN
    (V)
    VOUT
    (V)
    VOUT
    (V)
    Max. IOUT
    (A)
    Max. IOUT
    (A)
    Oper. Freq.
    (kHz)
    Package/Pins Smallest Available Pckg.
    (mm2)
    Price
    min max min max max w/pins See Notes
    MAX8795A  Step-Up
    Output OVP
    Shutdown
    Current Limit
    Fixed Freq./PWM
    Internal Pwr. FETs
    Soft Start
    TFT Bias
    VCOM Buffer
    2.5 6 3 18 0.5 0.5 1200
    LQFP/32
    TQFN/32
    26 $2.01 @1k
    See All Multifunction PMICs (83)

    Diagram
    MAX8795A: Minimal Operating Circuit
    Minimal Operating Circuit

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    Document Ref.: 19-0793; Rev 1; 2007-07-12
    This page last modified: 2009-09-01


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