Datasheet

TPS7A30xx

www.ti.com

SBVS125A –AUGUST 2010– REVISED MARCH 2011

OUTPUT NOISE Additionally, ac performance can be maximized by

adding a 0.01μF bypass capacitor (C

BYP

) from the FB

The TPS7A30xx provides low output noise when a

pin to the OUT pin. This capacitor greatly improves

noise reduction capacitor (C

NR/SS

) is used.

power-supply rejection at lower frequencies, for the

band from 10Hz to 200kHz; see Figure 18.

The noise reduction capacitor serves as a filter for the

internal reference. By using a 0.01μF noise reduction

The very high power-supply rejection of the

capacitor, the output noise is reduced by almost 80%

TPS7A30xx makes it a good choice for powering

(from 80μV

RMS

to 17μV

RMS

); see Figure 20.

high-performance analog circuitry, such as

operational amplifiers, ADCs, DACS, and audio

TPS7A30xx low output voltage noise makes it an

amplifiers.

ideal solution for powering noise-sensitive circuitry.

TRANSIENT RESPONSE

POWER-SUPPLY REJECTION

As with any regulator, increasing the size of the

The 0.01μF noise reduction capacitor greatly

output capacitor reduces over/undershoot magnitude

improves TPS7A30xx power-supply rejection,

but increases duration of the transient response.

achieving up to 20dB of additional power-supply

rejection for frequencies between 110Hz and

400KHz.