The MAX1937/MAX1938/MAX1939 are 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. Applications include notebooks and desktops
The MAX1937/MAX1938/MAX1939 family are synchronous two‑phase step‑down controllers designed for desktop CPU core power supplies. They use Quick‑PWM™ control architecture and provide instantaneous load‑step response with a 500 kHz effective switching frequency.
These devices support AMD Hammer, Intel VRM 9.0/9.1, and AMD Athlon™ Mobile VID codes, feature remote voltage sensing, cycle‑by‑cycle current limiting, and various protection mechanisms such as over‑voltage, under‑voltage, and thermal shutdown. They are offered in a 28‑pin QSOP package and are targeted at notebooks, desktops, servers, and high‑end networking equipment.
| Output Voltage Accuracy | +0.75 % |
|---|---|
| Maximum Load Current | 60 A |
| Effective Switching Frequency | 500 kHz |
| Input Voltage Range | 8 V to 24 V |
| Package | 28‑Pin QSOP |
They can deliver load currents up to 60 A.
The controllers operate at an effective switching frequency of 500 kHz.
The output voltage accuracy is ±0.75 %.
They are supplied in a 28‑Pin QSOP package.