P = (V

V

)

I

D

IN

OUT

OUT

-

×

TPS76201-Q1

www.ti.com

SLVSAO7 – DECEMBER 2010

The regulator dissipation is calculated using Equation 4:

(4)

Power dissipation resulting from quiescent current is negligible. Excessive power dissipation triggers the thermal

protection circuit.

Regulator Protection

The TPS76201-Q1 PMOS-pass transistor has a built-in back diode that conducts reverse current when the input

voltage drops below the output voltage (for example, during power down). Current is conducted from the output

to the input and is not internally limited. If extended reverse voltage operation is anticipated, external limiting

might be appropriate.

The TPS76201-Q1 features internal current limiting and thermal protection. During normal operation, the

TPS76201-Q1 limits output current to approximately 350 mA. When current limiting engages, the output voltage

scales back linearly until the overcurrent condition ends. While current limiting is designed to prevent gross

device failure, care should be taken not to exceed the power dissipation ratings of the package. If the

temperature of the device exceeds approximately +165°C, thermal protection circuitry shuts it down. Once the

device has cooled to below approximately +140°C, regulator operation resumes.

Copyright © 2010, Texas Instruments Incorporated

Submit Documentation Feedback

11

Product Folder Link(s): TPS76201-Q1