MP5021 – 12V, 7

MP5021 Rev. 1.1

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1/30/2013

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resistor attached to the output discharges the

output. Adding a resistor between the PD pin and

the output results in a slower output drop. If the

PD pin is floating, pull-down mode is disabled.

AUTO Pin

When the AUTO pin is floating, the part is in

auto-retry mode. In auto-retry mode, the part

turns off when it exceeds its thermal limit or

current limit timeout, and turns back on when the

part cools by 20°C or the restart timer completes.

When the AUTO pin is tied to ground, the part is

in latched-fault mode. In the latched-fault mode,

a thermal fault or current limit fault latches the

output off until the enable line is toggled from low

to high or the input voltage restarts.

Under/Over-Voltage Lockout

If the input supply falls below the UVLO threshold

or above the OVLO threshold, the output is

disabled and the PG pin goes low.

When the supply exceeds the UVLO threshold

without exceeding the OVLO threshold, the

output is enabled and the PG line is released.

Monitoring the Output Current

The IMON pin provides a voltage proportional to

the output current (the current through the power

device). Place a 100nF capacitor from IMON to

GND to smooth the indicator voltage.