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TPS54428

SLVSB42D – NOVEMBER 2011 – REVISED JANUARY 2016

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Device Functional Modes (continued)

There are some important considerations for this type of over-current protection. The load current one half of the

peak-to-peak inductor current is higher than the over-current threshold also when the current is being limited, the

output voltage tends to fall as the demanded load current may be higher than the current available from the

converter. This may cause the output voltage to fall. When the over current condition is removed, the output

voltage returns to the regulated value. This protection is non-latching.

7.4.3 UVLO Protection

Undervoltage lock out protection (UVLO) monitors the voltage of the VREG5 pin. When the VREG5 voltage is

lower than UVLO threshold voltage, the TPS54428 is shut off. This protection is non-latching.

7.4.4 Thermal Shutdown

TPS54428 monitors the temperature of itself. If the temperature exceeds the threshold value (typically 170°C),

the device is shut off. This is non-latch protection.