MP1492 – 2A, 4.2V-16V INPUT, FAST TRANSIENT SYNCHRONOUS STEP-DOWN CONVERTER
over and under voltage on the output. When the
.
FB voltage is higher than 125% of the REF
voltage, it’ll trigger OVP. Once it triggers OVP,
the LS-FET is always on, while the HS-FET is off.
It needs power cycle to power up again. When
the FB voltage is below 50% of the REF voltage
(0.805V), UVP will be triggered. Usually UVP
comes with current limit is hit, hence it results in
SCP.
UVLO protection
MP1492 has under-voltage lock-out protection
(UVLO). When the input voltage is higher than
the UVLO rising threshold voltage, the MP1492
powers up. It shuts off when the input voltage is
lower than the UVLO falling threshold voltage.
This is non-latch protection.
Thermal Shutdown
Thermal shutdown is employed in MP1492. The
junction temperature of the IC is monitored
internally. If the junction temperature exceeds the
threshold value (typically 150ºC), the converter
shuts off. This is non-latch protection. There is
about 25ºC hysteresis. Once the junction
temperature drops around 125ºC, it initiates a SS.
MP1492 Rev. 1.1
3/13/2012
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