259481A Marking, TPS259481AYWPR datasheet(21/56 Pages) TI

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8.3 Feature Description

The TPS25948xx eFuse is a compact, feature rich power management device that provides detection,

protection ,and indication in the event of system faults.

8.3.1 Undervoltage Lockout (UVLO and UVP)

The TPS25948xx implements undervoltage protection on IN and OUT in case the applied voltage becomes too

low for the system or device to properly operate. The undervoltage protection has a default lockout threshold

of VUVP which is fixed internally. Also, the UVLO comparator on the EN/UVLO pin allows the undervoltage

protection threshold to be externally adjusted to a user defined value. Figure 8-4 and Equation 1 show how a

resistor divider can be used to set the UVLO set point for a given voltage supply.

EN/UVLO

GND

Power

Supply

Figure 8-4. Adjustable Undervoltage Protection

VIN(UV) = VUVLO(F) × R1 + R2R2

(1)

8.3.2 Overvoltage Lockout (OVLO)

The TPS25948xx allows the user to implement Overvoltage protection on the bus to shield the system against

supply overvoltage conditions. The internal fast comparator on the OVLO pin allows the Overvoltage Lockout

threshold to be adjusted to a user defined value. Once the voltage at the OVLO pin crosses the OVLO rising

threshold VOV(R), the device turns off both the FETs to cut off the power path. Thereafter, the devices wait for the

voltage at the OVLO pin to fall below the OVLO falling threshold VOV(F) before the FETs are turned ON again.

The rising and falling thresholds are slightly different to provide hysterisis. Figure 8-5 and Equation 2 show how a

resistor divider can be used to set the OVLO set point for a given voltage supply.

OVLO

GND

Power

Supply

Figure 8-5. Adjustable Overvoltage Protection

VIN(OV) = VOV(F) × R1 + R2R2

(2)

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TPS25948

SLVSGT9A – FEBRUARY 2023 – REVISED SEPTEMBER 2023

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259481A Marking, TPS259481AYWPR Datasheet(PDF) 21 Page - Texas Instruments