V

O

V

I

OUT

RESET

10kW

GND

EN

IN

TPS725xx

1 mF

C

O

TPS72501

TPS72515, TPS72516

TPS72518, TPS72525

SLVS341E – MAY 2002 – REVISED JUNE 2010

www.ti.com

Figure 19. TPS72501 Fixed Output Typical Application Diagram

Table 1. Output Voltage Programming Guide (Standard 1% Resistor Values)

PROGRAM VOLTAGE

R1 (k

Ω)

R2 (k

Ω)

ACTUAL VOLTAGE

1.8 V

56.2

118

1.801

2.5 V

127

121

2.5

3.3 V

196

115

3.299

3.6 V

205

105

3.602

Regulator Protection

The TPS725xx pass element has a built-in back diode that safely 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 is anticipated, external limiting might be

appropriate.

The TPS725xx also features internal current limiting and thermal protection. During normal operation, the

TPS725xx limits output current to approximately 1.6 A. 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 165°C, thermal-protection circuitry shuts it down. Once the device has cooled down to below

145°C, regulator operation resumes.

10

Submit Documentation Feedback

Copyright © 2002–2010, Texas Instruments Incorporated

Product Folder Link(s): TPS72501 TPS72515 TPS72516 TPS72518 TPS72525