TPS7A3401DGNT datasheet(10/18 Pages) TI

Part #	TPS7A3401DGNT

Description	-20-V, -200-mA, Low-Noise NEGATIVE VOLTAGE REGULATOR

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Manufacturer	TI [Texas Instruments]

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TPS7A3401

SBVS163

– JUNE 2011

www.ti.com

APPLICATION INFORMATION

POWER FOR PRECISION ANALOG

DC/DC

converters

are

generally

the

preferred

One of the primary TPS7A3401 applications is to

solution to step up or down a voltage rail when

provide low-noise voltage rails to analog circuitry in

current consumption is not negligible. They offer high

order to improve system accuracy and precision.

efficiency with minimum heat generation, but they

have one primary disadvantage: they introduce a

The

TPS7A3401

negative

high-voltage

linear

high-frequency

component,

and

the

associated

regulator provides a low-noise voltage rail to analog

harmonics, on top of the dc output signal.

circuitry, such as operational amplifiers, ADCs, and

DACs.

This

high-frequency

component,

if

not

filtered

properly, degrades analog circuitry performance,

Because of the low noise levels at high voltages,

reducing overall system accuracy and precision.

analog circuitry with high-voltage input supplies can

be

used.

This

characteristic

allows

for

analog

The

TPS7A3401

offers

a

wide-bandwidth,

high

solutions to optimize the voltage range, thereby

power-supply rejection ratio (PSRR). It is highly

maximizing system accuracy.

recommended to use the maximum performance

schematic shown in Figure 18. Also, verify that the

fundamental frequency (and its first harmonic, if

POST DC/DC CONVERTER FILTERING

possible) is within the bandwidth of the regulator

Most of the time, the voltage rails available in a

PSRR, shown in Figure 15.

system do not match the voltage specifications

demanded by one or more of its circuits; these rails

must be stepped up or down, depending on specific

voltage requirements.

10

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TPS7A3401DGNT Datasheet(PDF) 10 Page - Texas Instruments

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