MAX6643LBBAEE+

$4.85

Description：IC CNTRLR FAN SPEED 16-QSOP
Series：-
Mfr：Analog Devices Inc./Maxim Integrated
Package：Tube

SKU:a27db2d90f31 Category: Thermal Management Brand: Analog Devices Inc./Maxim Integrated

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Product introduction

MAX6643LBBAEE+ is listed in the Thermal Management range at ChipApex. The manufacturer field lists Analog Devices Inc./Maxim Integrated. Its product description is IC CNTRLR FAN SPEED 16-QSOP. Review the specifications below when checking this part for your BOM.

Thermal Management specifications for MAX6643LBBAEE+

Description：IC CNTRLR FAN SPEED 16-QSOP
Series：-
Mfr：Analog Devices Inc./Maxim Integrated
Package：Tube
Function：Fan Control, Temp Monitor
Sensor Type：Internal and External
Sensing Temperature：-40°C ~ 125°C, External Sensor
Accuracy：±3.5°C Local(Max), ±3°C Remote(Max)
Topology：ADC, PWM Generator, Tach Counter
Output Type：PWM
Output Alarm：Yes
Output Fan：Yes
Voltage - Supply：3V ~ 5.5V
Operating Temperature：-40°C ~ 125°C
Grade：-
Qualification：-
Mounting Type：Surface Mount
Package / Case：16-SSOP (0.154", 3.90mm Width)
Supplier Device Package：16-QSOP

Thermal Management datasheet and documents for MAX6643LBBAEE+

MAX6643LBBAEE+

Thermal Management Overview

The MAX6643LBBAEE+ is an automatic PWM fan-speed controller with overtemperature output. It operates from a 3.0V to 5.5V supply and consumes 500µA typical current. The device measures local die temperature and one external diode-connected transistor, providing 2°C accuracy. It features pin-selectable high and low temperature thresholds in 5°C increments. The unit includes a FULLSPD input for 100% duty cycle control and outputs a 32Hz PWM signal. Fan failure detection is supported via tachometer or locked-rotor sensing.

Thermal Management Feature Summary

Automatic PWM fan-speed control based on internal and external temperature monitoring
Pin-selectable high and low temperature thresholds for customized cooling profiles
Fan-fail alarm output detecting locked-rotor conditions or tachometer signal loss
Overtemperature output (OT) for system warning or shutdown

Thermal Management Applications

Networking equipment thermal management
Server and workstation cooling systems
Desktop computer chassis ventilation
Storage equipment fan regulation

Thermal Management Procurement Notes

Verify the specific suffix 'B' indicates the factory-selected startup duty cycle configuration. Confirm the package code matches the required 16-pin QSOP footprint. Ensure the operating temperature range of -40°C to +125°C aligns with the target environment specifications before finalizing procurement orders.

Thermal Management Selection Notes

Select this component when simultaneous monitoring of local die and remote junction temperatures is required. The pin-selectable threshold inputs allow flexibility without changing part numbers. Verify that the external power transistor can handle the load driven by the PWM_OUT pin. Consider the 32Hz output frequency compatibility with the connected fan hardware.

Thermal Management Part Context

This device belongs to the MAX6643/MAX6644/MAX6645 family of automatic PWM fan-speed controllers. While the MAX6644 supports two external sensors and dual fans, the MAX6643 focuses on single-fan applications with local and remote sensing capabilities. All variants share similar control logic and interface requirements.