MIC502YM Micrel Inc, MIC502YM Datasheet - Page 10

• Manufacturer Part Number: MIC502YM
• Description: IC MANAGEMENT FAN/THERMAL 8SOIC
• Manufacturer: Micrel Inc

Specifications of MIC502YM

• Applications: Fan Controller
• Number Of Outputs: 1
• Current - Output: 10mA
• Voltage - Supply: 4 V ~ 13.2 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• No. Of Outputs: 1
• Output Current: 10mA
• Supply Voltage Range: 4.5V To 13.2V
• Driver Case Style: SOIC
• No. Of Pins: 8
• Operating Temperature Range: -40°C To +85°C
• Svhc: No SVHC (15-Dec-2010)
• Operating: RoHS Compliant
• Operating Current: 1.5mA
• Operating Temperature Classification: Industrial
• Package Type: SOIC
• Operating Supply Voltage (min): 4V
• Operating Supply Voltage (max): 13.2V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Load: -
• Lead Free Status / RoHS Status: Compliant, Lead free / RoHS Compliant
• Other names: 576-1241

Normal Operation
Normal operation consists of the PWM operating to
control the speed of the fan according to V
Exceptions to this otherwise indefinite behavior can be
caused by any of three conditions: V
an overtemperature condition; V
initiating a device shutdown and reset; or both V
V
these exceptions is treated as follows:
Micrel, Inc.
November 2006
T2
• Overtemperature: If the system temperature rises
• Shutdown/Reset: If V
typically 7% above the 100% duty-cycle operating
point, /OTF will be activated to indicate an
overtemperature fault. (V
detection
operations — the PWM continues its normal
behavior; with V
will
overtemperature condition is cleared and /OTF is no
longer asserted. It is assumed that in most systems,
the /OTF output will initiate power supply shutdown.
immediate, asynchronous shutdown occurs. While in
shutdown mode, OUT is off (low), and /OTF is
unconditionally
subsequently rises above V
occur. Reset is indistinguishable from a power-up
condition. The state of /OTF is cleared, a startup
interval is triggered, and normal fan operation
begins.
falling below V
be
Figure 4. Normal System Behavior
Greater of V
OUT Duty Cycl
100%.
Proportional to
O P E RA T IO N
is
V
Overtemp?
NORMAL
V
V
T1
< V
Reset ?
T1
T1
and V
NO
NO
NO
?
S L E E P
?
> V
?
< V
essentially
SLP
T1
OT
T1
IL
inactive
T2
, activating sleep mode. Each of
,
> V
If
V
e
T2
PWM(max)
V
Y E S
Y E S
Y E S
T1
T1
T1
is driven below V
T1
> V
(high/floating).
falls
independent
IH
, the output duty-cycle
A
being pulled below V
P O W E R ON
, a device reset will
ssert /OTF while
OT
S L E E P
V
T1
) Overtemperature
T1
below
> V
exceeding V
OT
T1
V
of
and V
OT
If
T1
,
IL
other
and
the
V
OT
an
T2
T1
IL
.
,
10
Sleep Mode
During normal operation, if V
the device will go into sleep mode and fan operation will
stop. The MIC502 will exit sleep mode when V
rise above V
this
resumption of normal operation upon exiting sleep is
indistinguishable from a power-on reset. (See “Sleep:
Normal Operation,” above.)
• Sleep: If V
enters sleep mode. All internal functions cease
unless V
V
(high/floating) and the PWM is disabled during sleep
(OUT will float).
HYST
occurs,
). The /OTF output is unconditionally inactive
T1
SLP
Figure 5. Sleep-Mode Behavior
or V
normal
T1
by the hysteresis voltage, V
and V
Reset Released
T2
Reset Initiate
Disable PWM
P O W E R O N
V
V
Wake Up?
S L P
V
V
T1
rise above V
S L E E P
T1
T1
Y E S
Y E S
Y E S
or V
+V
?
?
?
< V
> V
operation
H Y S T
T2
T2
IH
IL
>
fall below V
d
T1
and V
NO
NO
NO
WAKE
will
T2
. (V
SLP
fall below V
M9999-112206
resume.
WAKE
, the device
HYST
MIC502
T1
= V
. When
or V
SLP
The
SLP
T2
+
,