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1.5MHz, Dual, 180° Out-of-Phase, PWM Step-Down Controller with POR

Product Details

Key Features

Simplified Block Diagram

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Key Features

  • Low Output Noise in DSL Band
  • Ceramic Input/Output Capacitors
  • Step-Down or Step-Up/Step-Down Operation
  • Four Output, 90-Degree Out-of-Phase Operation (Using Two MAX8529s)
  • Foldback Current Limit
  • 4.75V to 23V Input Supply Range
  • 0 to 18V Output Voltage Range (Up to 6A)
  • > 90% Efficiency
  • Fixed-Frequency PWM Operation
  • Adjustable 600kHz to 1.5MHz Switching Frequency
  • External SYNC Input
  • Clock Output for Master/Slave Synchronization
  • Soft-Start and Soft-Stop
  • Active-Low RST Output with 140ms Minimum Delay
  • Lossless Current Limit (No Sense Resistor)

Applications/Uses

  • Broadband Routers
  • DSP, ASIC, and FPGA Power Supplies
  • Set-Top Boxes
  • xDSL Modems and Routers

Description

The MAX8529 dual, synchronized, step-down controller generates two outputs from input supplies ranging from 4.75V to 23V. Each output is adjustable from sub-1V to 18V. Input voltage ripple and total RMS input ripple current are reduced by synchronized 180-degree out-of-phase operation.

The switching frequency is adjustable from 600kHz to 1.5MHz with an external resistor. Alternatively, the controller can be synchronized to an external clock generated to another MAX8529 or a system clock. One MAX8529 can be set to generate an in-phase, or 90-degree out-of-phase, clock signal for synchronization with additional controllers. This allows two controllers to operate either as an interleaved two- or four-phase system with each output shifted by 90 degrees. These devices also feature soft-start and soft-stop.

The MAX8529 eliminates the need for current-sense resistors by utilizing the low-side MOSFET's on-resistance as a current-sense element. This protects the DC-to-DC components from damage during output overload conditions or when output short circuit faults without requiring a current-sense resistor. Adjustable foldback current limit reduces power dissipation during short-circuit conditions. The MAX8529 includes a power-on reset output to signal the system when both outputs reach regulation.

The MAX8529 is available in a 24-pin QSOP package. An evaluation kit is available to speed designs.

Simplified Block Diagram

MAX8529: Functional Diagram MAX8529: Functional Diagram 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 .

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.