MAX1939

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


Please check latest availability status for a specific part variant.

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.
MAX1937, MAX1938, MAX1939: Typical Application Circuit MAX1937, MAX1938, MAX1939: Typical Application Circuit Enlarge+

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
Part NumberVIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
Output Adjust. MethodIOUT1
(A)
Switch TypeSynchronous SwitchingPower Good SignalDC-DC OutputsOper. Freq.
(kHz)
Package/PinsBudgetary
Price
minmaxminmaxSee Notes
MAX1937 6240.81.55Digital/VID60ExternalYesYes1250
QSOP/28
$2.79 @1k
See All Step-Down Switching Regulators (388)
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.

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.

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