MAX1639

High-Speed Step-Down Controller with Synchronous Rectification for CPU Power

High-Accuracy, High-Efficiency CPU Power Supply Delivers >35A


Please check latest availability status for a specific part variant.

Description

The MAX1639 is an ultra-high-performance, step-down DC-DC controller for CPU power in high-end computer systems. Designed for demanding applications in which output voltage precision and good transient response are critical for proper operation, it delivers over 35A from 1.1V to 4.5V with ±1% total accuracy from a +5V ±10% supply. Excellent dynamic response corrects output transients caused by the latest dynamically clocked CPUs. This controller achieves over 90% efficiency by using synchronous rectification. Flying-capacitor bootstrap circuitry drives inexpensive, external N-channel MOSFETs.

The switching frequency is pin-selectable for 300kHz, 600kHz, or 1MHz. High switching frequencies allow the use of a small surface-mount inductor and decrease output filter capacitor requirements, reducing board area and system cost.

Output overvoltage protection is enforced by a crowbar circuit that turns on the low-side MOSFET with 100% duty factor when the output is 200mV above the normal regulation point. Other features include internal digital soft-start, a power-good output, and a 3.5V ±1% reference output. The MAX1639 is available in a 16-pin narrow SOIC package.
MAX1639: Typical Operating Circuit MAX1639: Typical Operating Circuit Enlarge+

Key Features

  • Better than ±1% Output Accuracy Over Line and Load
  • Greater than 90% Efficiency Using N-Channel MOSFETs
  • Pin-Selected High Switching Frequency: 300kHz, 600kHz, or 1MHz
  • Over 35A Output Current
  • Resistor-Divider Adjustable Output from 1.1V to 4.5V
  • Current-Mode Control for Fast Transient Response and Cycle-by-Cycle Current-Limit Protection
  • Short-Circuit Protection with Foldback Current Limiting
  • Crowbar Overvoltage Protection
  • Power-Good (PWROK) Output
  • Digital Soft-Start
  • High-Current (2A) Drive Outputs

Applications/Uses

  • Computers: Desktop, Workstation, Server
  • GTL Bus Termination
  • LAN Servers
  • Local DC-DC Converters for CPUs
  • Workstations

See parametric specs for Step-Down Switching Regulators (409)


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
minmaxminmaxmaxSee Notes
MAX1639 4.55.51.14.5Resistor35ExternalYesYes1
300
600
1000
SOIC (N)/16
$4.43 @1k

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.

MAX1639EVKIT: Evaluation Kit the MAX1639
Request Reliability Report for: MAX1639 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

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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    Type ID Title
    Evaluation Board1829MAX1639EVKIT Evaluation Kit the MAX1639