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MAX1937 Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX1937 Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 24 page 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 uti- lize Quick-PWM™ control architecture in conjunction with active load-current voltage positioning. Quick-PWM con- trol provides instantaneous load-step response, while programmable voltage positioning allows the converter to utilize full transient regulation limits, reducing the out- put capacitance requirement. The two phases operate 180° out-of-phase with an effective 500kHz switching fre- quency, 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 specifica- tions (see Table 1 for VID codes). The internal DAC pro- vides 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 pro- tect against output overvoltage. Applications Notebook and Desktop Computers Servers and Workstations Blade Servers High-End Switches High-End Routers Macro Base Stations Features o ±0.75% Output Voltage Accuracy o Instant Load-Transient Response o Up to 90% Efficiency Eliminates Heatsinks o Up to 60A Output Current o 8V to 24V Input Range o User-Programmable Voltage Positioning o Controlled VID Voltage Transition o 500kHz Effective Switching Frequency o MAX1937: AMD Hammer Compatible o MAX1938: Intel VRM 9.0/9.1 Compatible o MAX1939: AMD Athlon Mobile Compatible o Soft-Start o Power-Good (PWRGD) Output o Cycle-by-Cycle Current Limit o Output Overvoltage Protection (OVP) o RDS(ON) or RSENSE Current Sensing o Remote Voltage Sensing o 28-Pin QSOP Package Two-Phase Desktop CPU Core Supply Controllers with Controlled VID Change ________________________________________________________________ Maxim Integrated Products 1 28 27 26 25 24 23 22 21 20 19 18 17 16 15 1 2 3 4 5 6 7 8 9 10 11 12 13 14 VCC BST1 DH1 LX1 CS1 DL1 PWRGD VLG PGND DL2 CS2 LX2 DH2 BST2 FB EN REF GNDS GND ILIM VDD VPOS VID4 VID3 VID2 TIME VID1 VID0 QSOP TOP VIEW MAX1937 MAX1938 MAX1939 Pin Configuration Ordering Information 19-2498; Rev 1; 10/02 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. PART TEMP RANGE PIN-PACKAGE MAX1937EEI -40 °C to +85°C 28 QSOP MAX1938EEI -40 °C to +85°C 28 QSOP MAX1939EEI -40 °C to +85°C 28 QSOP Quick-PWM is a trademark of Maxim Integrated Products, Inc. Athlon is a trademark of Advanced Micro Devices, Inc. Intel is a registered trademark of Intel Corp. Typical Application Circuits and Functional Diagram appear at end of data sheet. |
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