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MAX1937, MAX1938, MAX1939
Two-Phase Desktop CPU Core Supply Controllers with Controlled VID Change
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Status
Active: In Production.
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.
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Data Sheet
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An evaluation kit is available: MAX1938EVKIT
Key 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
- Cycle-by-Cycle Current Limit
- Output Overvoltage Protection (OVP)
- RDS(ON) or RSENSE Current Sensing
- Remote Voltage Sensing
- 28-Pin QSOP Package
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Applications/Uses
- Blade Servers
- High-End Switches and Routers
- High-End Switches and Routers
- Macro Base Stations
- Notebook and Desktop Computers
- Servers and Workstations
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Key Specifications:
| Step-Down Switching Regulators |
| Part Number |
VIN
(V) |
VIN
(V) |
VOUT
(V) |
VOUT
(V) |
Max. IOUT
(A) |
Max. IOUT
(A) |
Output Adjust. Method |
DC-DC Outputs |
Oper. Freq.
(kHz) |
Package/Pins |
Smallest Available Pckg.
(mm2) |
Budgetary Price |
| min |
max |
min |
max |
≥ |
≤ |
max w/pins |
See Notes |
| MAX1937 |
6 |
24 |
0.8 |
1.55 |
60 |
60 |
Digital/VID |
1 |
250 |
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61.9 |
$2.09 @1k |
| MAX1938 |
8 |
1.1 |
1.85 |
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- |
| MAX1939 |
8 |
0.925 |
2 |
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- |
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See All Step-Down Switching Regulators (284)
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Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
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Diagram
 Typical Application Circuit
Application Notes
Reliability Reports
| Reliability Report: |
MAX1939.pdf |
| Show FIT data for: |
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| Request Reliability Report for: |
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Software/Models
Ordering Information
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Part Number
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Free
Sample |
Buy |
Status
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Package:
TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
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Temp |
RoHS/Lead-Free?
Materials Analysis
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| MAX1937EEI
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Active |
QSOP;28 pin;61.9 mm²
Outline Drawing:21-0055 (PDF)
Land Pattern: 90-0173 (PDF)
Use pkgcode/variation: E28-1*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX1937EEI+
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Active |
QSOP;28 pin;61.9 mm²
Outline Drawing:21-0055 (PDF)
Land Pattern: 90-0173 (PDF)
Use pkgcode/variation: E28+1*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1937EEI+T
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Active |
QSOP;28 pin;61.9 mm²
Outline Drawing:21-0055 (PDF)
Land Pattern: 90-0173 (PDF)
Use pkgcode/variation: E28+1*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1937EEI-T
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Active |
QSOP;28 pin
Land Pattern: Not Available
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-40°C to +85°C
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See data sheet
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| MAX1938EEI
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Active |
QSOP;28 pin;61.9 mm²
Outline Drawing:21-0055 (PDF)
Land Pattern: 90-0173 (PDF)
Use pkgcode/variation: E28-1*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX1938EEI-T
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Active |
QSOP;28 pin;61.9 mm²
Outline Drawing:21-0055 (PDF)
Land Pattern: 90-0173 (PDF)
Use pkgcode/variation: E28-1*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX1939EEI
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Active |
QSOP;28 pin;61.9 mm²
Outline Drawing:21-0055 (PDF)
Land Pattern: 90-0173 (PDF)
Use pkgcode/variation: E28-1*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX1939EEI-T
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Active |
QSOP;28 pin
Land Pattern: Not Available
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-40°C to +85°C
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See data sheet
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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; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product 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.
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Similar Products by Application
Evaluation Kits
| MAX1938EVKIT |
Evaluation Kit for the MAX1937, MAX1938, MAX1939 |
Products with Similar Part Numbers
| MAX1938EVKIT |
Evaluation Kit for the MAX1937, MAX1938, MAX1939 |
More Information
Didn't Find What You Need?
Information Index
Document Ref.: 19-2498
Rev 1;
2002-11-15
This page last modified: 2007-07-16
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