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MAX6620
Quad Linear Fan-Speed Controller
Industry’s First Linear Fan Controller with RPM Control—Controls Up to Four Fans with a Single IC
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Status
Active: In Production.
Description
The MAX6620 controls the speeds of up to four fans using four independent linear voltage outputs. The drive voltages for the fans are controlled directly over the I²C interface. Each output drives the base of an external bipolar transistor or the gate of a FET in highside drive configuration. Voltage feedback at the fan's
power-supply terminal is used to force the correct output voltage.
The MAX6620 offers two methods for fan control. In RPM mode, the MAX6620 monitors four fan tachometer logic outputs for precise (±1%) control of fan RPM and detection of fan failure. In DAC mode, each fan is driven with a voltage resolution of 9 bits and the tachometer outputs of the fans are monitored for failure.
The DAC_START input selects the fan power-supply voltage at startup to ensure appropriate fan drive when power is first applied. A watchdog feature turns the fans fully on to protect the system if there are no valid I²C communications within a preset timeout period.
The MAX6620 operates from a 3.0V to 5.5V power supply with low 250µA supply current, and the I²C-compatible interface makes it ideal for fan control in a wide range of cooling applications. The MAX6620 is available in a 28-pin TQFN package and operates over the -40°C to +125°C automotive temperature range.
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Data Sheet
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An evaluation kit is available: MAX6620EVCMAXQU, MAX6620EVKIT NOTE: This product uses the following:MAX6620 EVKIT Software
Key Features
- Controls Up to Four Independent Fans with Linear (DC) Drive
- Uses Four External Low-Cost Pass Transistors
- 1% Accuracy Precision RPM Control
- Controlled Voltage Rate-Of-Change for Best Acoustics
- I²C Bus Interface
- 3.0V to 5.5V Supply Voltage Range
- 250µA (typ) Operating Supply Current
- 3µA (typ) Shutdown Supply Current
- Small 5mm x 5mm Footprint
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Applications/Uses
- Communications Equipment
- Consumer Products
- Servers
- Storage Equipment
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Key Specifications:
| Fan Controllers |
| Part Number |
Fan Controller Functions |
Fan Cntrl. |
Interface |
Budgetary Price |
| See Notes |
| MAX6620 |
Fan Failure Detector |
Linear |
2-Wire/I2C/SMBus |
$2.50 @1k |
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See All Fan Controllers (19)
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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
Product Guides
Reliability Reports
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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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| MAX6620ATI+
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Active |
TQFN;28 pin;26 mm²
Outline Drawing:21-0140 (PDF)
Land Pattern: 90-0028 (PDF)
Use pkgcode/variation: T2855+8*
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-40°C to +125°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX6620ATI+T
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Active |
TQFN;28 pin;26 mm²
Outline Drawing:21-0140 (PDF)
Land Pattern: 90-0028 (PDF)
Use pkgcode/variation: T2855+8*
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-40°C to +125°C
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RoHS/Lead-Free: Lead Free
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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Similar Products by Function
| MAX6650, MAX6651 |
Fan-Speed Regulators and Monitors with SMBus™/I²C-Compatible Interface |
| MAX6660 |
Remote-Junction Temperature-Controlled Fan-Speed Regulator with SMBus Interface |
| MAX6639, MAX6639F |
2-Channel Temperature Monitor with Dual, Automatic, PWM Fan-Speed Controller |
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Evaluation Kits
Products with Similar Part Numbers
Didn't Find What You Need?
Information Index
Document Ref.: 19-4039
Rev 0;
2008-03-31
This page last modified: 2008-04-08
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