MIC2004 Micrel, MIC2004 Datasheet - Page 12

• Manufacturer Part Number: MIC2004
• Description: Fixed Current Limit Power Distribution Switch
• Manufacturer: Micrel

August 2005
Micrel
the main MOSFET switch. ENABLE will operate with
logic running from supply voltages as low as 1.8V.
ENABLE can be wire-OR’d with other MIC2004/2014s
or similar devices without damage to the device.
ENABLE may be driven higher than V
than 5.5V.
Slew Rate Control
Large capacitive loads can create significant current
surges when charged through a high-side switch such
as the MIC2004/2014. For this reason, MIC2004/2014
provides built-in slew rate control to limit the initial inrush
currents upon enabling the power MOSFET switch.
Slew rate control is active upon powering up, and upon
re-enabling the load. At shutdown, the discharge slew
rate is controlled by the external load and output
capacitor.
Thermal Shutdown
Thermal
shutdown
is
employed
IN
, but no higher
to
protect
12
MIC2004/2014 from damage should the die temperature
exceed safe operating levels. Thermal shutdown shuts
off the output MOSFET if the die temperature reaches
145°C.
MIC2004/2014 will automatically resume operation
when the die temperature cools down to 135°C. If
resumed operation results in reheating of the die,
another
MIC2004/2014 will continue cycling between ON and
OFF states until the offending load has been removed.
Depending on PCB layout, package type, ambient
temperature, etc., hundreds of milliseconds may elapse
from the incidence of a fault to the output MOSFET
being shut off. This delay is due to thermal time
constants within the system itself. In no event will the
device be damaged due to thermal overload because
die temperature is monitored continuously by on-chip
circuitry.
shutdown
cycle
will
MIC2004/MIC2014
occur
www.DataSheet4U.com
[phone]
M9999-080305
and
the