MIC502
Micrel
MIC502
Fan Management IC
Advance Information
General Description
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,
typically a thermistor-resistor divider, and (optionally) a sec-
ond signal, such as the NLX 鈥淔anC鈥?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 PWM
time base is determined by an external capacitor.
An open-collector overtemperature fault output is asserted if
the primary control input is driven above the normal control
range.
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.
The MIC502 is available as 8-pin plastic DIP and SOIC
packages in the 鈥?0掳C to +85掳C industrial temperature
range.
Features
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Temperature-proportional fan speed control
Low-cost, efficient PWM fan drive
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
8-pin DIP and SOIC packages
NLX and ATX power supplies
Personal computers
File servers
Telecom and networking hardware
Printers, copiers, and office equipment
Instrumentation
Uninterruptable power supplies
Power amplifiers
Applications
Ordering Information
Part Number
MIC502BN
MIC502BM
Temperature Range
鈥?0掳C to +85掳C
鈥?0掳C to +85掳C
Package
8-pin Plastic DIP
8-pin SOIC
Typical Application
12V
T1
R3
R4
R2
R1
1
2
3
4
MIC502
VT1
CF
GND
VDD
OUT
VT2
8
7
6
5
Fan
R
BASE
Q1
VSLP OTF
C
F
Overtemperature
Fault Output
Secondary
Fan-control
Input
May 1999
163
MIC502
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