MAX6643LBFAEE+

$3.88

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

SKU:970a3dcc3eee Category: Thermal Management Brand: Analog Devices Inc./Maxim Integrated

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Product introduction

MAX6643LBFAEE+ is listed in the Thermal Management range at ChipApex. The manufacturer field lists Analog Devices Inc./Maxim Integrated. Its product description is IC CTLR PWM FAN-SPEED 16QSOP. Review the specifications below when checking this part for your BOM.

Thermal Management specifications for MAX6643LBFAEE+

Description：IC CTLR PWM FAN-SPEED 16QSOP
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 MAX6643LBFAEE+

MAX6643LBFAEE+

Thermal Management Overview

The MAX6643LBFAEE+ is an automatic PWM fan-speed controller with overtemperature output, manufactured by Analog Devices Inc./Maxim Integrated. It operates within a supply voltage range of +3.0V to +5.5V and consumes a typical operating current of 500µA. The device monitors two temperature locations, including its own die temperature and an optional external transistor's temperature. It generates a 32Hz PWM waveform to drive an external power transistor for fan speed modulation. The unit features pin-selectable high and low-temperature fan thresholds in 5°C increments, a FULLSPD input for 100% duty cycle control, and a FANFAIL output for fan failure detection. It is housed in a 16-pin QSOP package and functions reliably across an operating temperature range of -40°C to +125°C.

Thermal Management Feature Summary

Monitors internal die temperature and one external diode-connected transistor to automatically adjust fan speed via PWM output.
Detects fan failures through locked-rotor logic, tachometer signals, or fan-supply current sensing using dedicated FAN_IN inputs.
Features pin-selectable high and low-temperature thresholds for precise fan speed control and includes a FULLSPD input for manual maximum speed override.

Thermal Management Applications

Networking Equipment
Storage Equipment
Servers
Desktop Computers
Workstations

Thermal Management Procurement Notes

Verify the specific suffix 'LBFAEE+' against the manufacturer's official datasheet to confirm the exact threshold configurations and package type. Ensure that the ordering information matches the required pin-selectable threshold settings and thermal specifications for your system design before finalizing procurement.

Thermal Management Selection Notes

Select this component when simultaneous monitoring of local and remote temperatures is required for active cooling management. It is suitable for systems needing automatic acoustic noise reduction through gradual PWM duty-cycle adjustments. Consider the availability of external transistors with appropriate ideality factors for accurate remote sensing.

Thermal Management Part Context

This part belongs to the MAX6643/MAX6644/MAX6645 family of automatic PWM fan-speed controllers. While the MAX6644 and MAX6645 monitor only external transistors, the MAX6643 uniquely combines internal die temperature sensing with external remote sensing capabilities. All variants share similar PWM generation and fan-fail detection architectures but differ in sensor channel configurations.