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The MIC502 is a thermal and fan management IC which supports the features for NLX/ATX power supplies and other control applications.
Fan speed is determined by an external temperature sensor and optionally a second signal, such as the NLX “FanC” signal. The MIC502 produces a low-frequency pulse-width modulated output for driving an external motor drive transistor. Low frequency PWM speed control allows operation of
standard brushless dc fans at low duty cycle for reduced acoustic noise and permits the use of a very small power transistor.
The MIC502 features a low-power sleep mode with a user determined threshold. Sleep mode completely turns off the fan and occurs when the system is asleep or off (both control inputs very low). A complete shutdown or reset can also be initiated by external circuitry as desired.
Applications include NLX and ATX power supplies, personal computers, file servers, telecom and networking hardware, printers, copiers, and office equipment, instrumentation, uninterruptible power supplies, power amplifiers.
- Temperature-proportional fan speed control
- 4.5V to 13.2V IC supply range
- Controls any voltage fan
- Overtemperature detection with fault output
- Integrated fan startup timer
- Automatic user-specified sleep mode
- Supports low-cost NTC/PTC thermistors
- DIL-8 and SO-8 packages
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| Supply voltage | +4V to +13.2V | | | |
Sink current max. | 10mA | | | |
Output source current max. | 25mA | | | |
Sleep voltage | GND to VDD | | | |
Power dissipation @ 25°C | 7.7mW/°C | DIL-8 | | |
| 8.3mW/°C | SO-8 | | |
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