OUTPUT VOLTAGE

PROGRAMMING GUIDE

VO

VI

OUT

FB

R1

R2

GND

EN

IN

TPS79101

1

µF

BYPASS

0.01

µF

1

µF

C1

22 pF

15 pF

15 pF

OUTPUT

VOLTAGE

R1

R2

2.5 V

3.3 V

3.6 V

C1

31.6 k

Ω

51 k

Ω

59 k

Ω

30.1 k

Ω

30.1 k

Ω

30.1 k

Ω

≤ 0.7 V

≥ 2 V

14

TPS791

SLVS325D – MARCH 2001 – REVISED FEBRUARY 2018

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Product Folder Links: TPS791

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Copyright © 2001–2018, Texas Instruments Incorporated

Feature Description (continued)

The table in Figure 34 shows the suggested value of this capacitor for several resistor ratios. If this capacitor is

not used (such as in a unity-gain configuration) or if an output voltage < 1.8 V is chosen, then the minimum

recommended output capacitor is 2.2 µF instead of 1 µF.

Figure 34. TPS79101 Adjustable LDO Regulator Programming

7.3.3 Regulator Protection

The TPS791 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 may

be appropriate.

The TPS791 features internal current limiting and thermal protection. During normal operation, the TPS791 limits

output current to approximately 400 mA. When current limiting engages, the output voltage scales back linearly

until the overcurrent condition ends. Although current limiting is designed to prevent gross device failure, care

must 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 the device down. When the device cools down to below approximately 140°C, regulator operation

resumes.