TPS74401

GND

EN

FB

IN

PG

SS

OUT

V

IN

V

OUT

V

PG

R

1

R

2

R

3

C

OUT

Optional

C

IN

1 F

m

C

SS

V

BIAS

C

BIAS

1 F

m

BIAS

TPS744xx

GND

EN

SNS

IN

PG

SS

OUT

V

IN

V

OUT

V

PG

R

3

C

OUT

Optional

C

IN

1 F

m

C

SS

V

BIAS

C

BIAS

1 F

m

BIAS

ADJUSTABLEVOLTAGEVERSION

FIXEDVOLTAGEVERSION

1V/div

500mV/div

Time(1ms/div)

C

=0 F

SS

m

C

=0.001 F

SS

m

C

=0.0047 F

SS

m

V

OUT

V

EN

0V

1.1V

TPS744xx

TPS744xx

TPS744xx

www.ti.com

SBVS066O – DECEMBER 2005 – REVISED MARCH 2013

3.0A Ultra-LDO with Programmable Soft-Start

Check for Samples: TPS744xx

1

FEATURES

DESCRIPTION

2

•

Soft-Start (SS) Pin Provides a Linear Startup

The TPS744xx low-dropout (LDO) linear regulators

with Ramp Time Set by External Capacitor

provide an easy-to-use robust power management

•

1% Accuracy Over Line, Load, and

solution for a wide variety of applications. User-

Temperature

programmable soft-start minimizes stress on the input

power source by reducing capacitive inrush current

•

Supports Input Voltages as Low as 0.9V with

on start-up. The soft-start is monotonic and well-

External Bias Supply

suited

for

powering

many

different

types

of

•

Adjustable Output (0.8V to 3.6V)

processors and ASICs. The enable input and power-

•

Fixed Output (0.9V to 3.6V)

good output allow easy sequencing with external

regulators. This complete flexibility permits the user to

•

Ultra-Low Dropout: 115mV at 3.0A (typ)

configure a solution that will meet the sequencing

•

Stable with Any or No Output Capacitor

requirements

of

FPGAs,

DSPs,

and

other

•

Excellent Transient Response

applications with specific start-up requirements.

•

Available in 5mm × 5mm × 1mm QFN and

A precision reference and error amplifier deliver 1%

DDPAK-7 Packages

accuracy over load, line, temperature, and process.

Each LDO is stable with low-cost ceramic output

•

Open-Drain Power-Good (QFN only)

capacitors and the device family is fully specified from

•

Active High Enable

–40°C to +125°C. The TPS744xx is offered in a small

(5mm × 5mm) QFN package, yielding a highly

APPLICATIONS

compact total solution size. For applications that

•

FPGA Applications

require additional power dissipation, the DDPAK

(KTW) package is also available.

•

DSP Core and I/O Voltages

space

•

Post-Regulation Applications

•

Applications with Special Start-Up Time or

Sequencing Requirements

•

Hot-Swap and Inrush Controls

space

Figure 1. Turn-On Response

Figure 2. Typical Application Circuits

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2005–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.