MP1492 – 2A, 4.2V-16V INPUT, FAST TRANSIENT SYNCHRONOUS STEP-DOWN CONVERTER

MP1492 Rev. 1.1

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12

3/13/2012

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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.

.