MAX1875

Dual 180° Out-of-Phase PWM Step-Down Controllers with POR


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Description

The MAX1875/MAX1876 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 MAX1875/MAX1876 or a system clock. One MAX1875/MAX1876 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°. These devices also feature soft-start and soft-stop.

The MAX1875/MAX1876 eliminate 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 conditions. The MAX1876 includes a power-on reset output to signal the system when both outputs reach regulation.

The MAX1875/MAX1876 are available in a 24-pin QSOP package. An evaluation kit is available to speed designs.
MAX1875, MAX1876: Typical Operating Circuit MAX1875, MAX1876: Typical Operating Circuit Enlarge+

Key Features

  • Two Independent Output Voltages
  • 180° Out-of-Phase Operation
  • 90° Out-of-Phase Operation (Using Two MAX1875/MAX1876s)
  • 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
  • Soft-Start and Soft-Stop
  • Active-low RST Output with 140ms Minimum Delay (MAX1876)
  • 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

    See parametric specs for Step-Down Switching Regulators (404)


    Part NumberVIN
    (V)
    VIN
    (V)
    VOUT1
    (V)
    VOUT1
    (V)
    IOUT1
    (A)
    Switch TypeSynchronous SwitchingOper. Freq.
    (kHz)
    FeaturesPackage/PinsBudgetary
    Price
    minmaxminmaxmaxSee Notes
    MAX1875 4.752311810ExternalYes600
    Adjustable Freq.
    Current Limit
    Dual/Multi-Phase
    External Sync.
    Fixed Freq./PWM
    QSOP/24
    $2.50 @1k
    MAX1876 
    Adjustable Freq.
    Current Limit
    Dual/Multi-Phase
    External Sync.
    Fixed Freq./PWM
    Reset Output
    QSOP/24
    $3.36 @1k

    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.
    Request Reliability Report for: MAX1875 
    Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

    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.

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