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Part Number: ADT7476A
Description: The ADT7476A dBCOOL controller is a thermal monitor and multiple PWM fan controller for noise-sensitiv...
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ADT7476A
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General Description
ADT7476A General Description
The ADT7476A dBCOOL controller is a thermal monitor and multiple PWM fan controller for noise-sensitive or power-sensitive applications requiring active system cooling. The ADT7476A can drive a fan using either a low or high frequency drive signal and can monitor the temperature of up to two remote sensor diodes plus its own internal temperature. The part also measures and controls the speed of up to four fans, so the fans operate at the lowest possible speed for minimum acoustic noise.
The automatic fan speed control loop optimizes fan speed for a given temperature. The effectiveness of the system's thermal solution can be monitored using the THERM input. The ADT7476A also provides critical thermal protection to the system using the bidirectional THERM pin as an output to prevent system or component overheating.
ADT7476A Maximum Ratings
| Parameter | Rating |
| Positive Supply Voltage (VCC) | 3.6 V |
| Maximum Voltage on +12 VIN Pin | 16 V |
| Maximum Voltage on +5 VIN Pin | 6.25 V |
| Maximum Voltage on All Open-Drain Outputs | 3.6 V |
| Max Voltage on TACH/PWM Pins | +5.5 V |
| Voltage on Remaining Input or Output Pins | −0.3 V to +4.2 V |
| Input Current at Any Pin | ±5 mA |
| Package Input Current | ±20 mA |
| Maximum Junction Temperature (TJMAX) | 150°C |
| Storage Temperature Range | −65°C to +150°C |
| Lead Temperature, Soldering | |
| IR Reflow Peak Temperature | 220°C |
| Pb-Free Peak Temperature | 260°C |
| Lead Temperature (Soldering, 10 sec) | 300°C |
| ESD Rating | 1500 V |
ADT7476A Features
·Monitors up to five voltages
·Improved TACH and PWM performance
·Controls and monitors up to four fans
·High and low frequency fan drive signal
·One on-chip and two remote temperature sensors
·Extended temperature measurement range up to 191°C
·Automatic fan speed control mode controls system cooling based on measured temperature
·Enhanced acoustic mode dramatically reduces user perception of changing fan speeds
·Thermal protection feature via THERM output
·Monitors performance impact of Intel® Pentium® 4 processor
·Thermal control circuit via THERM input
·3-wire and 4-wire fan speed measurement
·Limit comparison of all monitored values
·5 V support on all TACH and PWM channels
·Meets SMBus 2.0 electrical specifications
·Improved TACH and PWM performance
·Controls and monitors up to four fans
·High and low frequency fan drive signal
·One on-chip and two remote temperature sensors
·Extended temperature measurement range up to 191°C
·Automatic fan speed control mode controls system cooling based on measured temperature
·Enhanced acoustic mode dramatically reduces user perception of changing fan speeds
·Thermal protection feature via THERM output
·Monitors performance impact of Intel® Pentium® 4 processor
·Thermal control circuit via THERM input
·3-wire and 4-wire fan speed measurement
·Limit comparison of all monitored values
·5 V support on all TACH and PWM channels
·Meets SMBus 2.0 electrical specifications
ADT7476A
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- Datasheet: ADT7476A
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