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MAX1939 - Two-Phase Desktop CPU Core Supply Controllers

General 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.

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 Sens.

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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19-2498; Rev 1; 10/02 Two-Phase Desktop CPU Core Supply Controllers with Controlled VID Change General 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.