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Low-Cost, Internal-Switch, Step-Down Regulator for LCD Displays

Low-Cost, High-Efficiency Step-Down Converter

Product Details

Key Features

Simplified Block Diagram

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Key Features

  • 6V to 13.2V input supply range
  • Integrated 14V 2A n-channel MOSFET switch
  • Preset 1.5% accurate 3.3V fixed-output voltage or 2.0V to 3.6V adjustable output (Dual Mode)
  • Current-mode PWM operation
  • Frequency-selectable 500kHz/1MHz/1.5MHz
  • Internal 5V linear regulator supports up to 25mA external load
  • 2V precision reference (1%)
  • Integrated bootstrap diode for high-side MOSFET drive
  • External synchronous rectifier driver
  • Built-in soft-start
  • 200µA standby mode
  • Timer-delayed output fault protection
  • Thermal shutdown protection
  • Small 16-pin 4mm x 4mm thin QFN package

Applications/Uses

  • 8/12V Industrial Equipment
  • Digital System Power Supplies
  • LCD Monitors
  • LCD TVs
  • Point-of-Load Regulators

Description

The MAX8723 is a high-efficiency, switch-mode, step-down regulator with a 14V internal power switch. With only a few external passive components, this low-cost regulator can generate a fixed 3.3V or adjustable DC output voltage of 2.0V to 3.6V (dual mode) from a 6V to 13.2V DC source. The 13.2V input voltage range makes this part ideal for LCD displays, point-of-load regulators, and other 8/12V-powered industrial equipment applications.

The MAX8723 can deliver up to 2A. It features an internal power MOSFET, a built-in bootstrap diode for its MOSFET driver, and an interface for an external synchronous rectifier MOSFET drive to replace the Schottky diode and improve efficiency. Its fixed-frequency PWM/skip-mode operation and current-mode control architecture provide fast load-transient response without compensation. The switching frequency is a pin-selectable 500kHz, 1MHz, or 1.5MHz, minimizing the size of external components.

The MAX8723 has built-in soft-start, current-limit, thermal-shutdown, and timer-delayed output-fault shutdown functions. The soft-start function limits inrush current during startup, avoiding transients that can trigger the front-end protection circuits and lock up the system. The current limit, thermal-shutdown, and timer-delayed output-fault shutdown functions protect the power supply against fault conditions.

The MAX8723 also includes a linear regulator (VL), which provides a fixed 5V output (25mA) to support small external loads. The reference output is high-precision (2V ±1%) and can also supply small external load currents.

The MAX8723 is available in the 16-pin, 4mm x 4mm, TQFN package.

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 .