MAX6620 Maxim Integrated Products, MAX6620 Datasheet

MAX6620

Manufacturer Part Number

MAX6620

Description

Quad Linear Fan-Speed Controller

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX6620.pdf (30 pages)

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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 I

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 out-

put 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 dri-

ven with a voltage resolution of 9 bits and the tachome-

ter 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

The MAX6620 operates from a 3.0V to 5.5V power sup-

ply with low 250µA supply current, and the I

ble interface makes it ideal for fan control in a wide

range of cooling applications. The MAX6620 is avail-

able in a 28-pin TQFN package and operates over the

-40°C to +125°C automotive temperature range.

19-4039; Rev 0; 3/08

Typical Application Circuit appears at end of data sheet.

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

C communications within a preset timeout period.

C interface. Each output drives the base of an

Consumer Products

Servers

Communications Equipment

Storage Equipment

________________________________________________________________ Maxim Integrated Products

General Description

Quad Linear Fan-Speed Controller

Applications

C-compati-

♦ Controls Up to Four Independent Fans With

♦ Uses Four External Low-Cost Pass Transistors

♦ 1% Accuracy Precision RPM Control

♦ Controlled Voltage Rate-Of-Change for Best

♦ I

♦ 3.0V to 5.5V Supply Voltage Range

♦ 250µA (typ) Operating Supply Current

♦ 3µA (typ) Shutdown Supply Current

♦ Small 5mm x 5mm Footprint

+ Denotes a lead-free package.

* EP = Exposed paddle.

MAX6620ATI+

Linear (DC) Drive

Acoustics

C Bus Interface

DACOUT1

FAN_FAIL

PART

TOP VIEW

DACFB1

TACH1

GND

VCC

FAN

-40°C to +125°C

TEMP RANGE

(5mm

Ordering Information

THIN QFN

MAX6620

5mm

Pin Configuration

0.8mm)

PIN-

PACKAGE

28 TQFN-EP*

Features

TACH4

DACFB4

DACOUT4

GND

T2855-8

CODE

PKG

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