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Boost-Regulator with Integrated Charge Pumps, Switch Control, and High-Current Op Amp

Integrated Power Solution for LCD Monitors Saves Cost and Design Time

Product Details

Key Features

Parametric specs for Multifunction PMICs
VIN (V) (min) 2.5
VIN (V) (max) 5.5
# Step-Up Outputs 2
# Inverting Outputs 1
VOUT (V) (min) 1.25
VOUT (V) (max) 18
Package/Pins TQFN/24
Budgetary
Price (See Notes)
1.02
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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) 5.5
# Step-Up Outputs 2
# Inverting Outputs 1
VOUT (V) (min) 1.25
VOUT (V) (max) 18
Package/Pins TQFN/24
Budgetary
Price (See Notes)
1.02

Key Features

  • 2.5V to 5.5V Input Operating Range
  • Current Mode Step-Up Regulator
    • Fast-Transient Response
    • Built-In 20V, 3A, 0.16Ω n-Channel Power MOSFET
    • Cycle-by-Cycle Current Limit
    • 87% Efficiency (5V Input to 13V Output)
    • 1.2MHz Switching Frequency
    • ±1% Output Voltage Regulation Accuracy
  • High-Current 18V VCOM Buffer
    • ±500mA Output Short-Circuit Current
    • 45V/µs Slew Rate
    • 20MHz -3dB Bandwidth
    • Rail-to-Rail Output
  • Regulated Charge Pump for TFT Gate-On Supply
  • Regulated Charge Pump for TFT Gate-Off Supply
  • Logic-Controlled High-Voltage Switches with Adjustable Delay
  • Soft-Start and Timed Delay Fault Latch for All Outputs
  • Overload and Thermal Protection

Applications/Uses

  • LCD Monitor Panels
  • LCD TVs
  • Notebook Computer Displays

Description

The MAX17075 includes a high-voltage boost regulator,one high-current operational amplifier, two regulated charge pumps, and one MLG block for gate-driver supply modulation.

The step-up DC-DC converter is a 1.2MHz current-mode boost regulator with a built-in power MOSFET. It provides fast load-transient response to pulsed loads while producing efficiencies over 85%. The built-in 160mΩ (typ) power MOSFET allows output voltages as high as 18V boosted from inputs ranging from 2.5V to 5.5V. A built-in 7-bit digital soft-start function controls startup inrush currents.

The gate-on and gate-off charge pumps provide regulated TFT gate-on and gate-off supplies. Both output voltages can be adjusted with external resistive voltage-dividers.

The operational amplifier, typically used to drive the LCD backplane (VCOM), features high-output short-circuit current (±500mA), fast slew-rate (45V/µs), wide bandwidth (20MHz), and rail-to-rail outputs.

The MAX17075 is available in a 24-pin thin QFN package with 0.5mm lead spacing. The package is a square (4mm x 4mm) with a maximum thickness of 0.8mm for ultra-thin LCD design. It operates over the -40°C to +105°C temperature range.

Simplified Block Diagram

MAX17075: Simplified Operating Circuit MAX17075: Simplified 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 .