Specification	MAX6643LBBAEE+

Accuracy	3 °C, 3.5 °C
Function	Temp Monitor, Fan Control
Mounting Type	Surface Mount
Operating Temperature [Max]	125 °C
Operating Temperature [Min]	-40 C
Output Alarm	True
Output Fan	True
Output Type	PWM
Package / Case	16-SSOP
Package / Case [x]	0.154 in
Package / Case [y]	3.9 mm
Sensing Temperature	External Sensor
Sensing Temperature [Max]	125 °C
Sensing Temperature [Min]	-40 °C
Sensor Type	Internal and External
Supplier Device Package	16-QSOP
Topology	PWM Generator, Tach Counter, ADC
Voltage - Supply [Max]	5.5 V
Voltage - Supply [Min]	3 V

MAX6643 Series

Automatic PWM Fan-Speed Controllers with Overtemperature Output

Part	Package / Case	Package / Case [x]	Package / Case [y]	Output Type	Mounting Type	Sensing Temperature	Sensing Temperature [Max]	Sensing Temperature [Min]	Operating Temperature [Max]	Operating Temperature [Min]	Accuracy	Supplier Device Package	Function	Topology	Sensor Type	Voltage - Supply [Max]	Voltage - Supply [Min]	Supplied Contents	Utilized IC / Part	Type	Contents
Analog Devices Inc./Maxim Integrated MAX6643LBBAEE+	16-SSOP	0.154 in	3.9 mm	PWM	Surface Mount	External Sensor	125 °C	-40 °C	125 °C	-40 C	3 °C 3.5 °C	16-QSOP	Fan Control Temp Monitor	ADC PWM Generator Tach Counter	Internal and External	5.5 V	3 V
Analog Devices Inc./Maxim Integrated MAX6643LBFAEE+T	16-SSOP	0.154 in	3.9 mm	PWM	Surface Mount	External Sensor	125 °C	-40 °C	125 °C	-40 C	3 °C 3.5 °C	16-QSOP	Fan Control Temp Monitor	ADC PWM Generator Tach Counter	Internal and External	5.5 V	3 V
Analog Devices Inc./Maxim Integrated MAX6643LBEVKIT													PWM Signal Generator					Board(s)	MAX6643	Timing	Board(s)
Analog Devices Inc./Maxim Integrated MAX6643LBFAEE+	16-SSOP	0.154 in	3.9 mm	PWM	Surface Mount	External Sensor	125 °C	-40 °C	125 °C	-40 C	3 °C 3.5 °C	16-QSOP	Fan Control Temp Monitor	ADC PWM Generator Tach Counter	Internal and External	5.5 V	3 V
Analog Devices Inc./Maxim Integrated MAX6643LBBAEE+T	16-SSOP	0.154 in	3.9 mm	PWM	Surface Mount	External Sensor	125 °C	-40 °C	125 °C	-40 C	3 °C 3.5 °C	16-QSOP	Fan Control Temp Monitor	ADC PWM Generator Tach Counter	Internal and External	5.5 V	3 V

Pricing

Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly

Distributor	Package	Quantity	$

Digikey	N/A	900	$ 4.25
		1055	$ 4.25
	Tube	1	$ 5.88
		10	$ 3.96
		25	$ 3.46
		100	$ 2.90
		250	$ 2.63
		500	$ 2.46
		1000	$ 2.32
		2500	$ 2.18

Description

General part information

MAX6643 Series

The MAX6643/MAX6644/MAX6645 monitor temperature and automatically adjust fan speed to ensure optimum cooling while minimizing acoustic noise from the fan. Each device measures two temperature locations.The MAX6643/MAX6644/MAX6645 generate a PWM waveform that drives an external power transistor, which in turn modulates the fan's power supply. The MAX6643/MAX6644/MAX6645 monitor temperature and adjust the duty cycle of the PWM output waveform to control the fan's speed according to the cooling needs of the system. The MAX6643 monitors its own die temperature and an optional external transistor's temperature, while the MAX6644 and MAX6645 each monitor the temperatures of one or two external diode-connected transistors.The MAX6643 and MAX6644 have nine selectable trip temperatures (in 5°C increments). The MAX6645 is factory programmed and is not pin selectable.All versions include an overtemperature output (active-low OT). Active-low OT can be used for warning or system shutdown. The MAX6643 also features a FULLSPD input that forces the PWM duty cycle to 100%. The MAX6643/MAX6644/MAX6645 also feature a active-low FANFAIL output that indicates a failed fan. See theSelector Guidein the full data sheet for a complete list of each device's functions.The MAX6643 and MAX6644 are available in a small 16-pin QSOP package and the MAX6645 is available in a 10-pin µMAX®package. All versions operate from 3.0V to 5.5V supply voltages and consume 500µA (typ) supply current.ApplicationsDesktop ComputersNetworking EquipmentServersStorage EquipmentWorkstations