Supply Controller 28-Pin QSOP T/R

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.

• ±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)
• R_DS(ON) or R_SENSE Current Sensing
• Remote Voltage Sensing
• 28-Pin QSOP Package