TPSM82821 datasheet(9/54 Pages) TI

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8.3.4 Switch Current Limit and Hiccup Short Circuit Protection

The switch current limit prevents the device from high inductor current and from drawing excessive current from

the battery or input voltage rail. Excessive current can occur with a shorted or saturated inductor or a heavy load

or shorted output circuit condition. If the inductor current reaches the threshold of ILIMF, the high-side MOSFET

is turned off and the low-side MOSFET remains off while the inductor current flows through its body diode and

quickly ramps down.

When this switch current limit is triggered 32 times, the device stops switching. The device then automatically

starts a new start-up after a typical delay time of 128 µs has passed. This is named HICCUP short-circuit

protection. The device repeats this mode until the high load condition disappears.

8.3.5 Undervoltage Lockout

To avoid mis-operation of the device at low input voltages, undervoltage lockout is implemented that shuts down

the device at voltages lower than VUVLO.

8.3.6 Thermal Shutdown

The device goes into thermal shutdown and stops the power stage switching when the junction temperature

exceeds TJSD. When the device temperature falls below the threshold by 20°C, the device returns to normal

operation automatically by switching the power stage again.

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TPSM82823, TPSM82822, TPSM82821, TPSM82823A, TPSM82822A, TPSM82821A

SLVSEP0F – AUGUST 2019 – REVISED NOVEMBER 2021

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TPSM82821 Datasheet(PDF) 9 Page - Texas Instruments