1

3

2

GND

IN

SHDN

SENSE/ADJ

OUT

5

4

KTT PACKAGE

(TOP VIEW)

DCQ PACKAGE

(TOP VIEW)

1

3

2

GND

IN

SHDN

SENSE/ADJ

OUT

5

4

6

TPS7A45xx

LOW-NOISE FAST-TRANSIENT-RESPONSE 1.5-A LDO VOLTAGE REGULATORS

Check for Samples: TPS7A45xx

1

FEATURES

DESCRIPTION

2

•

Optimized for Fast Transient Response

•

Output Current: 1.5 A

The TPS7A45xx devices are low-dropout (LDO)

regulators optimized for fast transient response. The

•

High Output Voltage Accuracy : 1% at 25°C

device can supply 1.5 A of output current with a

•

Dropout Voltage: 300 mV

dropout voltage of 300 mV. Operating quiescent

•

Low Noise: 35

current is 1 mA, dropping to less than 1

μA in

shutdown. Quiescent current is well controlled; it does

•

High Ripple Rejection: 68 dB

not rise in dropout, as with many other regulators. In

•

1-mA Quiescent Current

addition to fast transient response, the TPS7A45xx

•

No Protection Diodes Needed

regulators have very low output noise, which makes

them ideal for sensitive RF supply applications.

•

Controlled Quiescent Current in Dropout

•

Fixed Output Voltages: 1.5 V, 1.8 V, 2.5 V, 3.3 V

Output voltage range is from 1.21 V to 20 V. The

TPS7A45xx

regulators

are

stable

with

output

•

Adjustable Output from 1.21 V to 20 V

capacitors as low as 10

μF. Small ceramic capacitors

•

Less Than 1-

μA Quiescent Current in

can be used without the necessary addition of ESR,

Shutdown

as

is

common

with

other

regulators.

Internal

•

Stable with 10-

μF Output Capacitor

protection

circuitry

includes

reverse-battery

protection, current limiting, thermal limiting, and

•

Stable with Ceramic Capacitors

reverse-current protection. The devices are available

•

Reverse-Battery Protection

in fixed output voltages of 1.5 V, 1.8 V, 2.5 V, 3.3 V,

•

No Reverse Current

and as an adjustable device with a 1.21-V reference

voltage. The TPS7A45xx regulators are available in

•

Thermal Limiting

the 5-pin TO-263 (KTT) and 6-pin TO-223 (DCQ)

packages.

APPLICATIONS

•

3.3-V to 2.5-V Logic Power Supplies

•

Post Regulator for Switching Supplies

•

Wireless Infrastructure

•

Radio-Frequency Systems

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

PowerPAD, PowerFLEX are trademarks of Texas Instruments.

PRODUCTION DATA information is current as of publication date.

Copyright © 2008–2009, 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.