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MAX1639
High-Speed Step-Down Controller with Synchronous Rectification for CPU Power
High-Accuracy, High-Efficiency CPU Power Supply Delivers >35A
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Status
Active: In Production.
Description
The MAX1639 is an ultra-high-performance, step-down DC-DC controller for CPU
power in high-end computer systems. Designed for demanding applications in which output voltage precision and good transient response are critical for proper operation, it delivers over 35A from 1.1V to 4.5V with ±1% total accuracy from a +5V ±10% supply. Excellent dynamic response corrects output transients caused by the latest dynamically clocked CPUs. This controller achieves over 90% efficiency by using synchronous rectification. Flying-capacitor bootstrap circuitry drives inexpensive, external N-channel MOSFETs.
The switching frequency is pin-selectable for 300kHz, 600kHz, or 1MHz. High switching frequencies allow the use of a small surface-mount inductor and decrease output filter capacitor requirements, reducing
board area and system cost.
Output overvoltage protection is enforced by a crowbar circuit that turns on the low-side MOSFET with 100% duty factor when the output is 200mV above the normal regulation point. Other features include internal digital soft-start, a power-good output, and a 3.5V ±1% reference output. The MAX1639 is available in a 16-pin narrow SOIC package.
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Data Sheet
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An evaluation kit is available: MAX1639EVKIT
Key Features
- Better than ±1% Output Accuracy Over Line and Load
- Greater than 90% Efficiency Using N-Channel MOSFETs
- Pin-Selected High Switching Frequency: 300kHz, 600kHz, or 1MHz
- Over 35A Output Current
- Resistor-Divider Adjustable Output from 1.1V to 4.5V
- Current-Mode Control for Fast Transient Response and Cycle-by-Cycle Current-Limit Protection
- Short-Circuit Protection with Foldback Current Limiting
- Crowbar Overvoltage Protection
- Power-Good (PWROK) Output
- Digital Soft-Start
- High-Current (2A) Drive Outputs
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Applications/Uses
- Computers: Desktop, Workstation, Server
- GTL Bus Termination
- LAN Servers
- Local DC-DC Converters for CPUs
- 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 |
| MAX1639 |
4.5 |
5.5 |
1.1 |
4.5 |
35 |
35 |
Resistor |
1 |
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61.9 |
$3.65 @1k |
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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 Operating Circuit
Reliability Reports
| 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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| MAX1639ESE
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Active |
SOIC(N);16 pin;61.9 mm²
Outline Drawing:21-0041 (PDF)
Land Pattern: 90-0097 (PDF)
Use pkgcode/variation: S16-5*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX1639ESE+
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Active |
SOIC(N);16 pin;61.9 mm²
Outline Drawing:21-0041 (PDF)
Land Pattern: 90-0097 (PDF)
Use pkgcode/variation: S16+5*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1639ESE+T
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Active |
SOIC(N);16 pin;61.9 mm²
Outline Drawing:21-0041 (PDF)
Land Pattern: 90-0097 (PDF)
Use pkgcode/variation: S16+5*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1639ESE-T
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Active |
SOIC(N);16 pin;61.9 mm²
Outline Drawing:21-0041 (PDF)
Land Pattern: 90-0097 (PDF)
Use pkgcode/variation: S16-5*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
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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Notes and Comments
High-Speed, High-Power Synchronous Rectification
Similar Products by Function
| MAX1624, MAX1625 |
High-Speed Step-Down Controllers with Synchronous Rectification for CPU Power |
| MAX1638 |
High-Speed Step-Down Controller with Synchronous Rectification for CPU Power |
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Evaluation Kits
Products with Similar Part Numbers
Didn't Find What You Need?
Information Index
Document Ref.: 19-1337
Rev 1;
2005-10-13
This page last modified: 2007-06-01
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