MIC502 Micrel Semiconductor, MIC502 Datasheet - Page 4

• Manufacturer Part Number: MIC502
• Description: Fan Management IC Advance Information
• Manufacturer: Micrel Semiconductor

MIC502
Symbol
Overtemperature Fault Output
V
I
Note 1.
Note 2.
Note 3.
Note 4:
Note 5.
Note 6.
Note 7.
Timing Diagrams
Note A. Output duty-cycle is initially determined by V
Note B. PWM duty-cycle follows V
Note C. V
Note D. The PWM duty-cycle follows V
Note E.
Note F.
Note G. Following the startup interval, the PWM duty-cycle is the higher of V
MIC502
OH
OL
V
V
V
V
T1
T2
OUT
OTF
0.7V
0.3V
0.3V
Exceeding the absolute maximum rating may damage the device.
The device is not guaranteed to function outside its operating rating.
Devices are ESD sensitive. Handling precautions recommended.
Part is functional over this V
ranges correspond to nominal V
Guaranteed by design.
V
Logic time base and PWM frequency. For other values of C
Both V
The PWM ‘wakes up’ because one of the control inputs (V
high for 64 clock periods. (V
V
V
V
OT
V
T1
V
V
V
SLP
V
0V
0V
0V
OH
OH
OT
DD
DD
DD
OL
OL
IH
IL
drops below V
is guaranteed by design to always be higher than V
A
T1
Parameter
Active (Low) Output Voltage
Off-State Leakage
and V
T2
50%
decrease below V
T2
t
PWM
. V
T2
T1
now determines the output duty-cycle.
DD
WAKE
as it increases.
B
T2
range; however, it is characterized for operation at 4.5V
DD
as it increases.
50%
= V
of 5V and 12V, respectively.
SLP
80%
SLP
but above V
+ V
Figure 1. Typical System Behavior
T1
HYST
, as it is greater than V
C
. See “Electrical Characteristics.”)
80%
Condition
I
V
OL
IL
/OTF
40%
. The device enters sleep mode.
= 2mA
PWM(max)
= V
T1
F
, f(Hz) = 30Hz
in this case) has risen above V
DD
D
166
.
40%
T1
70%
T2
and V
.
T2
0.1 F
C
.
E
, where C is in F.
70%
0%
40%
V
DD
WAKE
F
5.5V and 10.8V
. The startup timer is triggered, forcing OUT
t
STARTUP
100%
Min
G
V
DD
Typ
40%
1
13.2V ranges. These
Max
0.3
100%
Input
Signal
Range
30%
0%
Output
Duty Cycle
May 1999
Micrel
Units
V
A