TPS79201, TPS79225

TPS79228, TPS79230

SLVS337B – MARCH 2001 – REVISED MAY 2002

www.ti.com

10

OUTPUT VOLTAGE

PROGRAMMING GUIDE

VO

VI

OUT

FB

R1

R2

GND

EN

IN

≤ 0.7 V

≥ 2 V

TPS79201

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

33.4 k

Ω

53.6 k

Ω

59 k

Ω

30.1 k

Ω

30.1 k

Ω

30.1 k

Ω

Figure 23. TPS79201 Adjustable LDO Regulator Programming

REGULATOR PROTECTION

The TPS792xx 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 TPS792xx features internal current limiting and thermal protection. During normal operation, the TPS792xx 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.