Intel Thermal/Mechanical Reference Design Information
Thermal and Mechanical Design Guidelines 43
5.1.6 Pump Motor Performance
The pump power requirements for proper operation are given Table 5
Table 5. Pump Electrical Performance Requirements
Requirement Value
Maximum Average motor current draw 1.5 A
Motor start-up current draw 2.2 A
Motor header voltage 12 V ±5%
Tachometer output 3 pulse per revolution
Tachometer output signal Open-collector (open-drain)
Tachometer output signal current sink capability 10 mA
PWM signal input frequency 25 kHz (nominal)
21 kHz to 28kHz (allowable range)
PWM signal pull up in fan 3.3 V (recommended max)
5.25 V (absolute max)
PWM signal current source Imax = 5 mA
(short circuit current)
PWM signal maximum voltage for logic low VIL = 0.8 V
PWM compliant function RPM must be within spec for specified
duty cycle
In addition to comply with overall thermal requirements (see section 5.1.1), the pump
should meet the environment reliability requirements (see Section 5.2).
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