TPS79201, TPS79225

TPS79228, TPS79230

SLVS337B – MARCH 2001 – REVISED MAY 2002

ULTRALOW-NOISE, HIGH PSRR, FAST RF 100-mA

LOW-DROPOUT LINEAR REGULATORS

(3,00 mm x 3,00 mm)

Actual Size

(3,00 mm x 3,00 mm)

Actual Size

FEATURES

(55 mV at Full Load, TPS79230)

APPLICATIONS

DESCRIPTION

The TPS792xx family of low-dropout (LDO)

low-power linear voltage regulators features high

power supply rejection ratio (PSRR), ultralow

noise, fast start-up, and excellent line and load

transient responses in a small outline, SOT23,

package. Each device in the family is stable, with

a small 1-

µF ceramic capacitor on the output. The

family uses an advanced, proprietary BiCMOS

fabrication process to yield extremely low dropout

voltages (e.g., 55 mV at 100 mA, TPS79230).

Each

device

achieves

fast

start-up

times

(approximately 50

µs with a 0.001 µF bypass

capacitor) while consuming very low quiescent

current (170

µA typical). Moreover, when the

device is placed in standby mode, the supply

current is reduced to less than 1

µA. The

TPS79228 exhibits approximately 27

output voltage noise with a 0.1

µF bypass

capacitor. Applications with analog components

that are noise sensitive, such as portable RF

electronics, benefit from the high PSRR and low

noise features as well as the fast response time.

10

100

1 k

10 k

20

50

90

100 k

1 M

10 M

f – Frequency – Hz

TPS79228

RIPPLE REJECTION

vs

FREQUENCY

IO = 10 mA

60

0

VI = 3.8 V

Co = 10 µF

C(byp) = 0.01 µF

IO = 100 mA

10

30

40

70

80

f – Frequency – Hz

1k

10k

100k

IO = 1 mA

VI = 3.8 V

Co = 1 µF

C(byp) = 0.1 µF

100

IO = 100 mA

TPS79228

OUTPUT SPECTRAL NOISE DENSITY

vs

FREQUENCY

0

0.05

0.1

0.15

0.2

0.25

0.3

3

2

4

5

DBV PACKAGE

(TOP VIEW)

1

IN

GND

EN

OUT

BYPASS

Fixed Option

3

2

4

6

DBV PACKAGE

(TOP VIEW)

1

IN

GND

EN

OUT

BYPASS

5

FB

Adjustable Option

PRODUCTION DATA information is current as of publication date. Products

conform to specifications per the terms of Texas Instruments standard warranty.

Production processing does not necessarily include testing of all parameters.

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.

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Copyright

 2002, Texas Instruments Incorporated

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