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Maxim > Products > [Power and Battery Management] 
MAX8543, MAX8544
Step-Down Controllers with Prebias Startup, Lossless Sensing, Synchronization, and OVP


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Status
Active: In Production.

Data Sheet
FULL DATA SHEET (PDF, 440kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

Description
The MAX8543/MAX8544 current-mode, constant-frequency PWM buck controllers operate from a 3V to 13.2V input supply and generate adjustable 0.8V to 0.9 x VIN output voltages at loads up to 25A. They feature adjustable switching frequency and synchronization for noise-sensitive applications.

The MAX8543/MAX8544 can start with (or without) a preexisting bias on the output, without discharging the output. This feature simplifies tracking supply designs for core and I/O applications and redundant supply designs.

The MAX8543/MAX8544 use the DC resistance of the output inductor as the current-sense element for lossless, low-cost current sensing. The current-sense threshold can be set to four discrete levels to accommodate inductors with different DC resistance values.

The MAX8544 features a power-OK monitor and two MAX8544 controllers that can operate at 180° out-of-phase for dual-output applications.

Learn More About PowerMind™

An evaluation kit is available:  MAX8544EVKIT  

Key Features   Applications/Uses
  • Prebias Startup/Monotonic
  • 1% Output Accuracy
  • Ceramic, Polymer, or Electrolytic Capacitors
  • 200kHz to 1MHz Adjustable Frequency
  • 160kHz to 1.2MHz Synchronization
  • Lossless, Foldback Current Limit
  • Overvoltage Protection
  • Enable (On/Off)
  • Adjustable Soft-Start
  • MAX8544
    • Latch-Off/Autorecovery
    • Power-OK Monitor
    • Out-of-Phase Clock Output

 
  		• Networks and Telecom
  		• Servers
  		• Storage
  		• Wireless Base Stations

    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
    MAX8543  3 13.2 0.8 11 25 25 Resistor 1 1000
    QSOP/16
    		 31 $1.05 @1k
    MAX8544 
    QSOP/20
    		 54 $1.22 @1k
    See All Step-Down Switching Regulators (264)

    Diagram
    MAX8543, MAX8544: Typical Operating Circuit
    Typical Operating Circuit

    Evaluation Kits
  		• MAX8544EVKIT

    Reliability Reports
  		• Show FIT data for:
  		• Request Reliability Report for:

    Software/Models
  		• MAX8543 Mathcad Worksheet
    Use with the MAX8543 datasheet to speed the design of power supplies using the MAX8543. The Mathcad worksheet incorporates most of the equations in the datasheet along with equations and graphs of current waveforms, voltage noise and loop response. Requires Mathcad software that is able to run Mathcad 2000 worksheets.

    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: 1-8 of 8

    MAX8543 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX8543EEE    
    		Active QSOP;16 pin;31 mm²
    Outline Drawing: 21-0055 (PDF)
    Land Pattern: 90-0167 (PDF)
    Use pkgcode/variation: E16-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX8543EEE-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX8543EEE+  
    		Active QSOP;16 pin;31 mm²
    Outline Drawing: 21-0055 (PDF)
    Land Pattern: 90-0167 (PDF)
    Use pkgcode/variation: E16+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX8543EEE+T    
    		Active QSOP;16 pin;31 mm²
    Outline Drawing: 21-0055 (PDF)
    Land Pattern: 90-0167 (PDF)
    Use pkgcode/variation: E16+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX8544 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX8544EEP    
    		Active QSOP;20 pin;54 mm²
    Outline Drawing: 21-0055 (PDF)
    Land Pattern: 90-0168 (PDF)
    Use pkgcode/variation: E20-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX8544EEP-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX8544EEP+  
    		Active QSOP;20 pin;54 mm²
    Outline Drawing: 21-0055 (PDF)
    Land Pattern: 90-0168 (PDF)
    Use pkgcode/variation: E20+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX8544EEP+T    
    		Active QSOP;20 pin;54 mm²
    Outline Drawing: 21-0055 (PDF)
    Land Pattern: 90-0168 (PDF)
    Use pkgcode/variation: E20+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis

    More Information
  		• MathCad 2000 Worksheet for the MAX8543
  		• MAX8543, MAX8544Power Supply Cookbook

    Related Products
    MAX1954A Low-Cost, Current-Mode PWM Buck Controller with Foldback Current Limit
    MAX1953, MAX1954, MAX1957 Low-Cost, High-Frequency, Current-Mode PWM Buck Controllers
    MAX8545, MAX8546, MAX8548 Low-Cost, Wide Input Range, Step-Down Controllers with Foldback Current Limit

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    Document Ref.: 19-3155; Rev 0; 2004-05-26
    This page last modified: 2008-02-04


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