Two-Phase Desktop CPU Core Supply Controllers - Maxim
Description
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.
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 cycleby-cycle current limit to ensure that the current limit is not exceeded.
Crowbar protection is available to protect against output overvoltage.
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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 Cyc...
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