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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

Product Details

Key Features

Parametric specs for Multifunction PMICs
VIN (V) (min) 2.5
VIN (V) (max) 6
# Step-Up Outputs 1
# LDO Outputs 2
VOUT (V) (min) 3
VOUT (V) (max) 18
Package/Pins LQFP/32
Budgetary
Price (See Notes)
6.13
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Simplified Block Diagram

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Parameters

Parametric specs for Multifunction PMICs
VIN (V) (min) 2.5
VIN (V) (max) 6
# Step-Up Outputs 1
# LDO Outputs 2
VOUT (V) (min) 3
VOUT (V) (max) 18
Package/Pins LQFP/32
Budgetary
Price (See Notes)
6.13

Key Features

  • 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

Applications/Uses

  • Automotive Displays
  • LCD Monitor Panels
  • Notebook Computer Displays

Description

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.

Simplified Block Diagram

MAX8795A: Minimal Operating Circuit MAX8795A: Minimal 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 .