– The shape of the slope is depicted in the third region of Figure 7-3. The slope is nonlinear because the

maximum-rated junction temperature of the LDO is controlled by the power dissipation across the LDO.

Thus, when VIN – VOUT increases the output current decreases.

• The rated input voltage range governs both the minimum and maximum of VIN – VOUT.

Figure 7-3 shows the recommended area of operation for this device on a JEDEC-standard high-K board with a

RθJA, as given in the Thermal Information table.

Rated output

current

Output current limited by

dropout

Output current limited by thermals

Limited by

minimum VIN

Limited by

maximum VIN

VIN ± VOUT (V)

Figure 7-3. Region Description of Continuous Operation Regime

7.2 Typical Application

Figure 7-4 shows the typical application circuit for the TPS7A21-Q1. If necessary for some applications, increase

the input and output capacitances above the 1µF minimum value.

TPS7A21-Q1

IN

EN

GND

OUT

OUTPUT

1 µF

INPUT

ENABLE

1 µF

Figure 7-4. TPS7A21-Q1 Typical Application

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TPS7A21-Q1

SBVS437C – DECEMBER 2022 – REVISED JUNE 2024

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