MAX1858

Dual 180° Out-of-Phase PWM Step-Down Controller with Power Sequencing and POR


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Description

The MAX1858 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 and supports loads of 10A or higher. Input voltage ripple and total RMS input ripple current are reduced by synchronized 180° out-of-phase operation.

The switching frequency is adjustable from 100kHz to 600kHz with an external resistor. Alternatively, the controller can be synchronized to an external clock generated to another MAX1858 or a system clock. One MAX1858 can be set to generate an in-phase, or 90° 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°. The device also features “first-on/last-off” power sequencing for compatibility with DSPs, ASICs, and FPGAs, as well as soft-start and soft-stop to ensure reliable and repeatable power sequencing.

The MAX1858 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-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 condition. A power-on reset output signals the system when both outputs reach regulation.

The MAX1858 is available in a 24-pin QSOP package. An evaluation kit is available to speed designs.
MAX1858: Typical Operating Circuit MAX1858: Typical Operating Circuit Enlarge+

Key Features

  • Two Independent Output Voltages
  • 180° Out-of-Phase Operation
  • 90° Out-of-Phase Operation (Using Two MAX1858s)
  • Foldback Current Limit
  • 4.75V to 23V Input Supply Range
  • 0 to 18V Output-Voltage Range (Up to 10A)
  • >90% Efficiency
  • Fixed-Frequency Pulse-Width Modulation (PWM) Operation
  • Adjustable 100kHz to 600kHz Switching Frequency
  • External SYNC Input
  • Clock Output for Master/Slave Synchronization
  • Power-On/-Off Sequencing with Soft-Start and Soft-Stop
  • RST-bar Output with 140ms Minimum Delay
  • Lossless Current Limit (No Sense Resistor)
  • Applications/Uses

    • Broadband Routers
    • DSP, ASIC, and FPGA Power Supplies
    • Network-Power Supplies
    • Servers
    • Set-Top Boxes
    • Telecom Power Supplies
    Part NumberVIN
    (V)
    VIN
    (V)
    VOUT1
    (V)
    VOUT1
    (V)
    Output Adjust. MethodIOUT1
    (A)
    Switch TypeSynchronous SwitchingDC-DC OutputsOper. Freq.
    (kHz)
    Package/PinsBudgetary
    Price
    minmaxminmaxSee Notes
    MAX1858 4.7523118Resistor10ExternalYes2600
    QSOP/24
    $3.45 @1k
    See All Step-Down Switching Regulators (367)
    Pricing Notes:
    This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

    Technical Documents

    User Guide 5861 EE-SIM Design and Simulation Environment User Guide

    Quality and Environmental Data

    Product Reliability Reports: MAX1858.pdf 
    Lead-Free Package Tin (Sn) Whisker Reports

    CAD Symbols and Footprints

  • MAX1858AEEG+
  • MAX1858AEEG+T
  • MAX1858EEG
  • MAX1858EEG+
  • MAX1858EEG+T
  • MAX1858EEG-T
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

    Quality Management System >
    Environmental Management System >

     
    Status:
    Package:
    Temperature:

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