www.ti.com

22 pF

15 pF

15 pF

OUTPUT VOLTAGE

PROGRAMMING GUIDE

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 pF

1.22 V

short

open

TPS793xx

GND

NR

FB

IN

OUT

EN

V

IN

V

OUT

R1

C1

R2

1

µF

1

µF

0.01

µF

Regulator Protection

TPS79301, TPS79318

TPS79325, TPS79328, TPS793285

TPS79330, TPS79333, TPS793475

SLVS348H – JULY 2001 – REVISED OCTOBER 2004

APPLICATION INFORMATION (continued)

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 (e.g., 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 400 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 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.

11