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Data Sheet

FULL DATA SHEET (PDF, 384kB) Download   E-Mail

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 cycle-by-cycle current limit to ensure that the current limit is not exceeded. Crowbar protection is available to protect against output overvoltage.

Key Features		Applications/Uses
±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 Sensing Remote Voltage Sensing 28-Pin QSOP Package		Blade Servers High-End Switches and Routers High-End Switches and Routers Macro Base Stations Notebook and Desktop Computers Servers and Workstations

Diagram

Typical Application Circuit

Application Notes

Application Note 1901: Convert the MAX1937/8/9 from Latch Off Mode to Hiccup Mode Under Short Circuit Condition - MAX1937, MAX1938, MAX1939 Application Note 3218: Power Supply Meets AMD K8 Low-Power Mobile Specification - MAX1937, MAX1938, MAX1939 Application Note 3499: Compact-Footprint, 60A, Two-Phase Power Supply for AMD K8 Motherboards - MAX1937

Evaluation Kits

MAX1938EVKIT

Reliability Reports

Show FIT data for: MAX1937 MAX1938 MAX1939 Reliability Report: MAX1939EEI.pdf Request Reliability Report for: MAX1937 MAX1938

Software/Models

none

Ordering Information
Notes: Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day. Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
Devices: 1-8 of 8
MAX1937	Free Sample	Buy	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX1937EEI			QSOP;28 pin; Dwg: 21-0055 (PDF) Use pkgcode/variation: E28-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1937EEI-T			QSOP;28 pin; Dwg: 21-0055 (PDF) Use pkgcode/variation: E28-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1937EEI+			QSOP;28 pin; Dwg: 21-0055 (PDF) Use pkgcode/variation: E28+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1937EEI+T			QSOP;28 pin; Dwg: 21-0055 (PDF) Use pkgcode/variation: E28+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1938	Free Sample	Buy	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX1938EEI			QSOP;28 pin; Dwg: 21-0055 (PDF) Use pkgcode/variation: E28-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1938EEI-T			QSOP;28 pin; Dwg: 21-0055 (PDF) Use pkgcode/variation: E28-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1939	Free Sample	Buy	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX1939EEI			QSOP;28 pin; Dwg: 21-0055 (PDF) Use pkgcode/variation: E28-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1939EEI-T			QSOP;28 pin; Dwg: 21-0055 (PDF) Use pkgcode/variation: E28-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis

More Information

New Product Press Release 2002-12-03  2002-09-04  MAX1939Power Supply Cookbook

Related Products

MAX1917 Tracking, Sinking and Sourcing, Synchronous Buck Controller for DDR Memory and Termination Supplies MAX1953, MAX1954, MAX1957 Low-Cost, High-Frequency, Current-Mode PWM Buck Controllers

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