MAX6620

PRODUCTION

Quad Linear Fan-Speed Controller

Industry’s First Linear Fan Controller with RPM Control—Controls Up to Four Fans with a Single IC

Data Sheet (Rev. 1) Product Selection Table
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Overview

  • 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

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 high-side 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.

Applications

  • Communications Equipment
  • Consumer Products
  • Servers
  • Storage Equipment
MAX6620
Quad Linear Fan-Speed Controller
MAX6620: Typical Application Circuit
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Documentation

Data Sheet 1

Reliability Data 1

Technical Articles 4

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Software Resources

Device Drivers 1

Hardware Ecosystem

Parts Product Life Cycle Description
Fan Speed & Thermoelectric Cooler (TEC) Controllers 4
MAX6650
PRODUCTION Fan-Speed Regulators and Monitors with SMBus/I²C-Compatible Interface
MAX6651
PRODUCTION Fan-Speed Regulators and Monitors with SMBus/I²C-Compatible Interface
MAX6660
PRODUCTION Remote-Junction Temperature-Controlled Fan-Speed Regulator with SMBus Interface
MAX6639
PRODUCTION 2-Channel Temperature Monitor with Dual, Automatic, PWM Fan-Speed Controller
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Tools & Simulations

Software Development 1

IBIS Model 1

Evaluation Kits

MAX6620EVKIT

Evaluation Kit/Evaluation System for the MAX6620

Buy Now View Details

Features and Benefits

  • 3V to 5.5V Supply Voltage Range
  • Controls Up to Four Independent Fans with Linear (DC) Drive
  • Uses Four External Low-Cost PNP Pass Transistors
  • Fan-Fail Output
  • I²C/SMBus-Compatible Interface
  • Fully Assembled and Tested

Product Details

The MAX6620 evaluation system (MAX6620EVCMAXQU+) consists of the MAX6620 evaluation kit (MAX6620EVKIT+) and the Maxim CMAXQUSB+ command module. Windows 2000/XP/Vista®-compatible software is also available for use with the MAX6620 evaluation system (EV system) and can be downloaded from the Maxim website (www.maximintegrated.com/evkitsoftware).

The MAX6620 evaluation kit (EV kit) is a fully assembled and tested printed-circuit board (PCB) that evaluates the MAX6620 quad linear fan-speed controller. The MAX6620 controls the speeds of up to four fans using four independent linear voltage outputs. The EV kit includes 3-pin fan headers to allow easy fan connection and an I²C/SMBus™-compatible interface that allows for software control of the drive voltage, tachometer count, fan configuration, and fan dynamics.

The Maxim CMAXQUSB command module provides the I²C/SMBus interface and is connected to the computer through the universal serial bus (USB) port. The MAX6620 EV kit software provides a graphical user interface (GUI) for exercising the MAX6620 features.

Applications

  • Communications Equipment
  • Consumer Products
  • Servers
  • Storage Equipment

MAX6620EVCMAXQU

Evaluation Kit/Evaluation System for the MAX6620

Buy Now View Details

Features and Benefits

  • 3V to 5.5V Supply Voltage Range
  • Controls Up to Four Independent Fans with Linear (DC) Drive
  • Uses Four External Low-Cost PNP Pass Transistors
  • Fan-Fail Output
  • I²C/SMBus-Compatible Interface
  • Fully Assembled and Tested

Product Details

The MAX6620 evaluation system (MAX6620EVCMAXQU+) consists of the MAX6620 evaluation kit (MAX6620EVKIT+) and the Maxim CMAXQUSB+ command module. Windows 2000/XP/Vista®-compatible software is also available for use with the MAX6620 evaluation system (EV system) and can be downloaded from the Maxim website (www.maximintegrated.com/evkitsoftware).

The MAX6620 evaluation kit (EV kit) is a fully assembled and tested printed-circuit board (PCB) that evaluates the MAX6620 quad linear fan-speed controller. The MAX6620 controls the speeds of up to four fans using four independent linear voltage outputs. The EV kit includes 3-pin fan headers to allow easy fan connection and an I²C/SMBus™-compatible interface that allows for software control of the drive voltage, tachometer count, fan configuration, and fan dynamics.

The Maxim CMAXQUSB command module provides the I²C/SMBus interface and is connected to the computer through the universal serial bus (USB) port. The MAX6620 EV kit software provides a graphical user interface (GUI) for exercising the MAX6620 features.

Applications

  • Communications Equipment
  • Consumer Products
  • Servers
  • Storage Equipment
MAX6620EVKIT
Evaluation Kit/Evaluation System for the MAX6620
MAX6620EVCMAXQU
Evaluation Kit/Evaluation System for the MAX6620

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