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MAX8855
Dual, 5A, 2MHz Step-Down Regulator

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


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Status
Active: In Production.

Data Sheet
FULL DATA SHEET (PDF, 260kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail


Description
The MAX8855 high-efficiency, dual step-down regulator is capable of delivering up to 5A at each output. The device operates from a 2.35V to 3.6V supply, and provides output voltages from 0.6V to 0.9 x VIN, making it ideal for on-board point-of-load applications. Total output error is less than ±1% over load, line, and temperature.

The MAX8855 operates 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 systemlevel designs. A reference input is provided to facilitate output-voltage tracking applications. The MAX8855 is available in a 32-pin thin QFN (5mm x 5mm) package with 0.8mm max height.

Key Features   Applications/Uses
  • 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 2.35V 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
  • Available in 5mm x 5mm Thin QFN Package
  • Sink/Source Current in DDR Applications

 
  • ASIC/CPU/DSP Power Supplies
  • DDR Power Supplies
  • Network Power Supplies
  • Printer Power Supplies
  • Set-Top Box Power Supplies

    Key Specifications:  Step-Down Switching Regulators
    Part Number VIN
    (V)
    VIN
    (V)
    VOUT
    (V)
    VOUT
    (V)
    Max. IOUT
    (A)
    Max. IOUT
    (A)
    Output Adjust. Method DC-DC Outputs Oper. Freq.
    (kHz)
    Package/Pins Smallest Available Pckg.
    (mm2)
    Price
    min max min max max w/pins See Notes
    MAX8855  2.35 3.6 0.6 3.3 5 5 Resistor 2 2000
    TQFN/32
    26 $4.55 @1k
    See All Step-Down Switching Regulators (264)

    Diagram
    MAX8855: Typical Operating Circuit
    Typical Operating Circuit

    Reliability Reports
  • Reliability Report: MAX8855.pdf
  • Show FIT data for:

    Software/Models
    none

    Ordering Information
    Notes:

    1. Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
    2. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
    3. Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
    4. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.


    Devices: 1-3 of 3

    MAX8855 Free
    Sample
    Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    Temp RoHS/Lead-Free?
    Materials Analysis
    MAX8855EVKIT+    
    Active

    Land Pattern: Not Available

    See data sheet
    MAX8855ETJ+T    
    Active TQFN;32 pin;26 mm²
    Outline Drawing: 21-0140 (PDF)
    Land Pattern: 90-0012 (PDF)
    Use pkgcode/variation: T3255+4*
    -40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX8855ETJ+  
    Active TQFN;32 pin;26 mm²
    Outline Drawing: 21-0140 (PDF)
    Land Pattern: 90-0012 (PDF)
    Use pkgcode/variation: T3255+4*
    -40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis

    More Information
  • New Product Press Release 2007-12-10 
  • Product Family Ad: Download

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    Document Ref.: 19-0726; Rev 1; 2008-06-19
    This page last modified: 2008-12-04


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