TPS7A5201RPST datasheet(12/28 Pages) TI1

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TPS7A52

SBVS295 – NOVEMBER 2019

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(1)

All table conditions must be met.

(2)

VBIAS is only required for VIN < 1.4 V.

(3)

The device is disabled when any condition is met.

7.3.3.2 Thermal Protection (Tsd)

The thermal shutdown circuit protects the LDO against excessive heat in the system, either resulting from current

limit or high ambient temperature.

The output of the LDO turns off when the LDO temperature (junction temperature, TJ) exceeds the rising thermal

shutdown temperature. The output turns on again after TJ decreases below the falling thermal shutdown

temperature.

A high power dissipation across the device, combined with a high ambient temperature (TA), can cause TJ to be

greater than or equal to Tsd, triggering the thermal shutdown and causing the output to fall to 0 V. The LDO can

cycle on and off when thermal shutdown is reached under these conditions.

7.4 Device Functional Modes

Table 3 provides a quick comparison between the regulation and disabled operation.

Table 3. Device Functional Modes Comparison

OPERATING

MODE

PARAMETER

VIN

VBIAS

IOUT

Regulation(1)

VIN > VOUT(nom) + VDO

VBIAS ≥ VUVLO(BIAS)

(2)

VEN > VIH(EN)

IOUT < ICL

TJ ≤ TJ(maximum)

Disabled(3)

VIN < VUVLO_1,2(IN)

VBIAS < VUVLO(BIAS)

VEN < VIL(EN)

—

TJ > Tsd

7.4.1 Regulation

The device regulates the output to the nominal output voltage when all conditions in Table 3 are met.

7.4.2 Disabled

When disabled, the pass device is turned off, the internal circuits are shut down, and the output voltage is

actively discharged to ground by an internal resistor from the output to ground. See the Active Discharge section

for additional information.

7.4.3 Current Limit Operation

During a current-limit event, the LDO regulates the output current instead of the output voltage; therefore, the

output voltage falls with decreased load impedance.

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