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Two-Phase Desktop CPU Core Supply Controllers with Controlled VID Change

Product Details

Key Features

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 6
VIN (V) (max) 24
VOUT1 (V) (min) 0.8
VOUT1 (V) (max) 1.55
IOUT1 (A) (max) 60
Switch Type External
Output Adjust. Method Digital/VID
Synchronous Switching? Yes
Power Good Signal Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 250
Package/Pins QSOP/28
Budgetary
Price (See Notes)
3.17
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Simplified Block Diagram

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Parameters

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 6
VIN (V) (max) 24
VOUT1 (V) (min) 0.8
VOUT1 (V) (max) 1.55
IOUT1 (A) (max) 60
Switch Type External
Output Adjust. Method Digital/VID
Synchronous Switching? Yes
Power Good Signal Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 250
Package/Pins QSOP/28
Budgetary
Price (See Notes)
3.17

Key Features

  • ±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

Applications/Uses

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

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.

Simplified Block Diagram

MAX1937, MAX1938, MAX1939: Typical Application Circuit MAX1937, MAX1938, MAX1939: Typical Application Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.