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Dual, 5A, 1.5MHz, Step-Down Regulator with Integrated High-Side Switches

First Step-Down DC-DC Converter with Integrated MOSFETs,
REFIN for Tracking and DDR Termination, Enable and POK for Sequencing

Product Details

Key Features

Simplified Block Diagram

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Key Features

  • Integrated 80mΩ RDS(ON), High-Side MOSFETs
  • Adjustable Hiccup-Mode Short-Circuit Current-Limit Protection
  • ±1% Output Accuracy over Load, Line, and Temperature
  • 9V to 14V Input Supply Range
  • Adjustable Output Down to 0.6V
  • Digital Soft-Start Reduces Inrush Supply Current
  • 300kHz to 1.5MHz Adjustable Switching Frequency
  • External Frequency Synchronization
  • Compatible with Ceramic, Polymer, and Electrolytic Capacitors
  • 180° Out-of-Phase Operation
  • Enable and POK for Each Output
  • REFIN Feature for Tracking Applications
  • 28-Pin, 5mm x 5mm Thin QFN Package

Applications/Uses

  • Cable Modem
  • DDR Memories
  • DSL
  • Network Equipment
  • Servers
  • Set-Top Box
  • Storage
  • Telecom

Description

The MAX8653 dual-output, synchronous, step-down regulator contains low RDS(ON) integrated high-side MOSFET switches for ease of layout and achieving small footprints. Each output delivers up to 5A. The output voltage is adjustable down to 0.6V and operates from a 9V to 14V input voltage. The MAX8653 uses a proprietary high-bandwidth, constant-frequency, peak-voltage-mode control architecture and operates at an adjustable switching frequency between 300kHz to 1.5MHz. The architecture is suitable for use with a wide range of output capacitor technologies such as aluminum electrolytic, POSCAPs, and ceramic capacitors for flexible design. The simple compensation scheme achieves fast response under both line and load transients.

The switching frequency is adjustable using a single external resistor. The output channels operate 180° out-of-phase to reduce the input ripple current, thus reducing the required input capacitance. The high operating frequency minimizes the size of external components. The external reference input (REFIN) enables implementation of tracking applications such as DDR power supplies. The MAX8653 utilizes internal digital soft-start and features a lossless (cyle-by-cyle) current sensing. It includes adjustable, hiccup-mode current-limit and short-circuit protection for minimum power dissipation under fault conditions. Each output contains an enable (EN_) input along with a power-good (POK_) signal for easy sequencing. The MAX8653 is available in a 28-pin, 5mm x 5mm thin QFN package.

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Simplified Block Diagram

 

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.