MAX8655

Highly Integrated, 25A, Wide-Input, Internal MOSFET, Step-Down Regulator

First Step-Down DC-DC Converter with +4.5V to +28V Input Voltage Range
and Up to 1.2MHz Programmable Switching Frequencies


Please check latest availability status for a specific part variant.

Description

The MAX8655 synchronous-PWM buck regulator operates from a 4.5V to 25V input and generates an output voltage adjustable from 0.7V to 5.5V at loads up to 25A. Integrated power MOSFETs provide a small footprint, ease of layout, and reduced EMI. Removing the board trace inductances ensures the highest efficiency at high frequency.

The MAX8655 uses peak current-mode control architecture with an adjustable (200kHz to 1MHz), constant-switching frequency, which is externally synchronizable. The MAX8655's adjustable current limit uses the inductor's DC resistance to improve efficiency or an external sense resistor for higher accuracy. Foldback type current limit is available to reduce the power dissipation under severe-overload or short-circuit conditions. A reference input is provided for use with a high-accuracy external reference or for DDR and tracking applications.

Monotonic startup provides safe starting into a prebiased output, where traditional step-down regulators discharge the output capacitor during soft-start, creating a negative voltage at the output and possibly damaging the load.

A 180° out-of-phase synchronization output is available for synchronizing with another MAX8655.

An enable input is provided for on/off control and to facilitate output sequencing. Output-voltage sensing for programmable overvoltage protection is provided and is independent of the feedback network to further enhance the output overvoltage protection.

Overall, the MAX8655 provides enough flexibility for the experienced user, as well as simplicity and ease of use for non-power-supply engineers.

Learn More About PowerMind™
MAX8655: Typical Operating Circuit MAX8655: Typical Operating Circuit Enlarge+

Key Features

  • 25A Output Current
  • Integrated Power MOSFETs
  • Operates from 4.5V to 25V Supply
  • 1% FB Voltage Accuracy Over Temperature
  • Adjustable Output Voltage Down to 0.7V
  • Adjustable Switching Frequency and External Synchronization from 200kHz to 1MHz
  • 180° Phase-Shifted Synchronization
  • Adjustable Overcurrent Limit
  • Adjustable Slope Compensation
  • Selectable Current-Limit Mode: Latch-Off orAutomatic Recovery
  • Monotonic Output Voltage Rise at Startup into Prebias Output
  • Output Sources and Sinks Current for DDR Applications
  • Enable Input
  • Power-OK (POK) Output
  • Adjustable Soft-Start
  • Independently Adjustable Overvoltage Protection

Applications/Uses

  • IBA Power Supplies
  • Networking
  • Nonisolated DC-DC Power Modules
  • Notebook Computers
  • Point-of-Load Power Supplies
  • Servers and Workstations
  • Telecom Power

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)
FeaturesDesign ToolsPackage/PinsBudgetary
Price
minmaxminmaxmaxSee Notes
MAX8655 4.5250.75.525InternalYes1000
Adjustable Freq.
Current Limit
Dual/Multi-Phase
External Sync.
Fixed Freq./PWM
Output OVP
EE-Sim
TQFN/56
TQFN HYBRID/56
$6.79 @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.

MAX8655EVKIT: Evaluation Kit for the MAX8655 and MAX8688

Tools & Models

  • EE-Sim: Design & Simulate MAX8655
  • MAX8655 SIMPLIS Schematic
  • Product Reliability Reports: MAX8655.pdf 
    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.

    Quality Management System >
    Environmental Management System >

     
    Status:
    Package:
    Temperature:

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