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Maxim > Products > [Power and Battery Management] 
MAX1937, MAX1938, MAX1939
Two-Phase Desktop CPU Core Supply Controllers with Controlled VID Change


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Status
Active: In Production.

Data Sheet
FULL DATA SHEET (PDF, 384kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

Description
The MAX1937/MAX1938/MAX1939 comprise a family of synchronous, two-phase, step-down controllers capable of delivering load currents up to 60A. The controllers utilize Quick-PWM™ control architecture in conjunction with active load-current voltage positioning. Quick-PWM control provides instantaneous load-step response, while programmable voltage positioning allows the converter to utilize full transient regulation limits, reducing the output capacitance requirement. The two phases operate 180° out-of-phase with an effective 500kHz switching frequency, thus reducing input and output current ripple, as well as reducing input filter capacitor requirements.

The MAX1937/MAX1938/MAX1939 are compliant with AMD Hammer, Intel®‚ Voltage-Regulator Module (VRM) 9.0/9.1, and AMD Athlon™ Mobile VID code specifications (see Table 1 for VID codes). The internal DAC provides ultra-high accuracy of ±0.75%. A controlled VID voltage transition is implemented to minimize both undervoltage and overvoltage overshoot during VID input change.

Remote sensing is available for high output-voltage accuracy. The MOSFET switches are driven by a 6V gate-drive circuit to minimize switching and crossover conduction losses to achieve efficiency as high as 90%. The MAX1937/MAX1938/MAX1939 feature cycle-by-cycle current limit to ensure that the current limit is not exceeded. Crowbar protection is available to protect against output overvoltage.

An evaluation kit is available:  MAX1938EVKIT  

Key Features   Applications/Uses
  • ±0.75% Output Voltage Accuracy
  • Instant Load-Transient Response
  • Up to 90% Efficiency Eliminates Heatsinks
  • Up to 60A Output Current
  • 8V to 24V Input Range
  • User-Programmable Voltage Positioning
  • Controlled VID Voltage Transition
  • 500kHz Effective Switching Frequency
  • MAX1937: AMD Hammer Compatible
  • MAX1938: Intel VRM 9.0/9.1 Compatible
  • MAX1939: AMD Athlon Mobile Compatible
  • Soft-Start
  • Power-Good (PWRGD) Output
  • Cycle-by-Cycle Current Limit
  • Output Overvoltage Protection (OVP)
  • RDS(ON) or RSENSE Current Sensing
  • Remote Voltage Sensing
  • 28-Pin QSOP Package

 
  		• Blade Servers
  		• High-End Switches and Routers
  		• High-End Switches and Routers
  		• Macro Base Stations
  		• Notebook and Desktop Computers
  		• Servers and Workstations

    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
    MAX1937  6 24 0.8 1.55 60 60 Digital/VID 1 250
    QSOP/28
    		 62 $1.75 @1k
    MAX1938  8 1.1 1.85
    QSOP/28
    		 $2.15 @1k
    MAX1939  8 0.925 2
    QSOP/28
    		 $1.75 @1k
    See All Step-Down Switching Regulators (264)

    Diagram
    MAX1937, MAX1938, MAX1939: Typical Application Circuit
    Typical Application Circuit

    Application Notes
  		• Application Note 1901: Convert the MAX1937/8/9 from Latch Off Mode to Hiccup Mode Under Short Circuit Condition - MAX1937, MAX1938, MAX1939
  		• Application Note 3218: Power Supply Meets AMD K8 Low-Power Mobile Specification - MAX1937, MAX1938, MAX1939
  		• Application Note 3499: Compact-Footprint, 60A, Two-Phase Power Supply for AMD K8 Motherboards - MAX1937

    Evaluation Kits
  		• MAX1938EVKIT

    Reliability Reports
  		• Reliability Report: MAX1939.pdf
  		• Show FIT data for:
  		• Request Reliability Report 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: 1-8 of 8

    MAX1937 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1937EEI    
    		Active QSOP;28 pin;62 mm²
    Outline Drawing: 21-0055 (PDF)
    Land Pattern: 90-0173 (PDF)
    Use pkgcode/variation: E28-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1937EEI-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX1937EEI+  
    		Active QSOP;28 pin;62 mm²
    Outline Drawing: 21-0055 (PDF)
    Land Pattern: 90-0173 (PDF)
    Use pkgcode/variation: E28+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1937EEI+T    
    		Active QSOP;28 pin;62 mm²
    Outline Drawing: 21-0055 (PDF)
    Land Pattern: 90-0173 (PDF)
    Use pkgcode/variation: E28+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1938 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1938EEI    
    		Active QSOP;28 pin;62 mm²
    Outline Drawing: 21-0055 (PDF)
    Land Pattern: 90-0173 (PDF)
    Use pkgcode/variation: E28-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1938EEI-T    
    		Active QSOP;28 pin;62 mm²
    Outline Drawing: 21-0055 (PDF)
    Land Pattern: 90-0173 (PDF)
    Use pkgcode/variation: E28-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1939 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1939EEI    
    		Active QSOP;28 pin;62 mm²
    Outline Drawing: 21-0055 (PDF)
    Land Pattern: 90-0173 (PDF)
    Use pkgcode/variation: E28-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1939EEI-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet

    More Information
  		• New Product Press Release 2002-12-03  2002-09-04 
  		• MAX1939Power Supply Cookbook

    Related Products
    MAX1917 Tracking, Sinking and Sourcing, Synchronous Buck Controller for DDR Memory and Termination Supplies
    MAX1953, MAX1954, MAX1957 Low-Cost, High-Frequency, Current-Mode PWM Buck Controllers

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    Document Ref.: 19-2498; Rev 1; 2002-11-15
    This page last modified: 2007-07-16


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