MAX8855, MAX8855A

Dual, 5A, 2MHz Step-Down Regulators

Smallest, Most Efficient 5A Regulators with Integrated Switches in 5mm x 5mm TQFN Package


Please check latest availability status for a specific part variant.

Description

The MAX8855/MAX8855A high-efficiency, dual step-down regulators are capable of delivering up to 5A at each output. The devices operate from a 2.25V to 3.6V supply, and provide output voltages from 0.6V to 0.9 x VIN, making them ideal for on-board point-of-load applications. Total output error is less than ±1% over load, line, and temperature.

The MAX8855/MAX8855A operate in PWM mode with a switching frequency ranging from 0.5MHz to 2MHz, set by an external resistor. It can also be synchronized to an external clock in the same frequency range. Two internal switching regulators operate 180° out-of-phase to reduce the input ripple current, and consequently reduce the required input capacitance. The high operating frequency minimizes the size of external components. High efficiency, internal dual-nMOS design keeps the board cool under heavy loads. The voltage-mode control architecture and the high-bandwidth (> 15MHz typ) voltage-error amplifier allow a type III compensation scheme to be utilized to achieve fast response under both line and load transients, and also allow for ceramic output capacitors.

Programmable soft-start reduces input inrush current. Two enable inputs allow the turning on/off of each output individually, resulting in great flexibility for system-level designs. A reference input is provided to facilitate output-voltage tracking applications. The MAX8855/MAX8855A are available in a 32-pin TQFN (5mm x 5mm) package with 0.8mm max height.

MAX8855: Typical Operating Circuit MAX8855: Typical Operating Circuit Enlarge+

Key Features

  • 27mΩ On-Resistance Internal MOSFETs
  • Dual, 5A, PWM Step-Down Regulators
  • Fully Protected Against Overcurrent, Short Circuit, and Overtemperature
  • ±1% Output Accuracy Over Load, Line, and Temperature
  • Operates from 2.25V to 3.6V Supply
  • REFIN on One Channel for Tracking or External Reference
  • Integrated Boost Diodes
  • Adjustable Output from 0.6V to 0.9 x VIN
  • Soft-Start Reduces Inrush Supply Current
  • 0.5MHz to 2MHz Adjustable Switching, or FSYNC Input
  • All-Ceramic-Capacitor Design
  • 180° Out-of-Phase Operation Reduces Input Ripple Current
  • Individual Enable Inputs and PWRGD Outputs
  • Safe-Start into Prebiased Output
  • Available in 5mm x 5mm Thin QFN Package
  • Sink/Source Current in DDR Applications

Applications/Uses

  • ASIC/CPU/DSP Power Supplies
  • DDR Power Supplies
  • Network Power Supplies
  • Printer Power Supplies
  • Set-Top Box Power Supplies
Part NumberVIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
Output Adjust. MethodIOUT1
(A)
Switch TypeSynchronous SwitchingPower Good SignalDC-DC OutputsOper. Freq.
(kHz)
Design ToolsPackage/PinsBudgetary
Price
minmaxminmaxSee Notes
MAX8855 2.253.60.63.3Resistor5InternalYesYes22000EE-Sim
TQFN/32
$6.69 @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.


MAX8855EVKIT: Evaluation Kit for the MAX8855

Technical Documents

User Guide 5861 EE-SIM Design and Simulation Environment User Guide
Tutorial 5133 Power-Supply Solutions for Altera FPGAs
Tutorial 5132 Power-Supply Solutions for Xilinx FPGAs

Quality and Environmental Data

Product Reliability Reports: MAX8855.pdf 
Request Reliability Report for: MAX8855A 
Lead-Free Package Tin (Sn) Whisker Reports

Tools & Models

  • EE-Sim: Design & Simulate MAX8855A
  • EE-Sim: Design & Simulate MAX8855
  • MAX8855 SIMPLIS Schematic
  • CAD Symbols and Footprints

  • MAX8855AETJ+
  • MAX8855AETJ+T
  • MAX8855ETJ+
  • MAX8855ETJ+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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