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GND

NR

FB

IN

OUT

EN

V

IN

V

OUT

R

1

C

1

R

2

1 F

m

2.2 F

m

0.01 F

m

TPS79301

OUTPUTVOLTAGE

PROGRAMMINGGUIDE

R

1

R

2

C

1

2.5V

3.3V

3.6V

1.22V

OUTPUT

VOLTAGE

31.6kW

short

51kW

59kW

open

30.1kW

30.1kW

30.1kW

0pF

22pF

15pF

15pF

Regulator Protection

TPS793xx

SLVS348K – JULY 2001 – REVISED OCTOBER 2007

Figure 23. TPS79301 Adjustable LDO Regulator Programming

The TPS793xx 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 TPS793xx features internal current limiting and thermal protection. During normal operation, the TPS793xx

limits output current to approximately 400mA. 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 or the absolute maximum

voltage ratings of the device. If the temperature of the device exceeds approximately +165

°C, thermal-protection

circuitry shuts it down. Once the device has cooled down to below approximately +140

°C, regulator operation

resumes.

10

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