TPS2521 datasheet(24/47 Pages) TI

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During fast voltage step at output (e.g. hot-plug), the fast comparator based reverse blocking mechanism

ensures minimum jump/glitch on the input rail.

VIN

VBUS

IIN

Figure 8-7. Reverse Current Blocking Performance During Fast Voltage Step at Output

During slow voltage ramp at output, the linear ORing based reverse blocking mechanism ensures there's no DC

current flow from OUT to IN, thereby avoiding input rail from getting slowly charged up to output voltage.

VIN

VBUS

IIN

Figure 8-8. Reverse Current Blocking Performance During Slow Voltage Ramp at Output

When the input supply droops or gets disconnected while the output storage element (capacitor bank or super

capacitor) is charged to the full voltage, the linear ORing scheme minimizes the self-discharge from OUT to IN.

This ensures maximum hold-up time for the output storage element in critical power back-up applications.

It also prevents incorrect supply presence indication in applications which sense the input voltage to detect if the

supply is connected.

VIN

VOUT

Figure 8-9. Reverse Current Blocking Performance During Input Supply Failure

8.3.7 Overtemperature Protection (OTP)

The device monitors the internal die temperature (TJ) at all times and shuts down the part as soon as the

temperature exceeds a safe operating level (TSD) thereby protecting the device from damage. The device will

not turn back on until the junction cools down sufficiently, that is the die temperature falls below (TSD - TSDHYS).

When the TPS2521xL (latch-off variant) detects thermal overload, it will be shut down and remain latched-off

until the device is power cycled or re-enabled. When the TPS2521xA (auto-retry variant) detects thermal

overload, it will remain off until it has cooled down by TSDHYS. Thereafter, it will remain off for an additional

delay of tRST after which it will automatically retry to turn on if it is still enabled.

TPS2521

SLVSFX8 – MARCH 2021

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TPS2521 Datasheet(PDF) 24 Page - Texas Instruments