TPS7A8101-Q1 datasheet(10/29 Pages) TI1

No de pièce	TPS7A8101-Q1

Description	TPS7A8101-Q1 Low-Noise, Wide-Bandwidth, High PSRR, Low-Dropout 1-A Linear Regulator

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Fabricant	TI1 [Texas Instruments]

Site Internet	http://www.ti.com

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Time (50 ms/div)

-0.05

0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4

0.45

-0.5

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

5

5.5

6

6.5

D012

VI = VEN

VO

3.85

50 µs/div

3.8

3.75

3.7

3.35

3.25

3.3

3.2

3.15

2.5

1.5

2

1

0.5

0

V (for reference)

I

V

O

I

O

Time (50 ms/div)

-0.002

0

0.002

0.004

0.006

0.008

-0.5

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

D011

EN

OUT

C(NR) = C(BYPASS) (nF)

10

20

30 40 50 70 100

200 300

500 700 1000

1

2

3

5

10

20

30

50

100

200

300

500

1000

D010

VI VO = 1 V

7

6.5

6

5.5

5

4.5

4

3.5

3

50 ms/div

3.333

3.32475

3.3165

3.30825

3.3

3.29175

3.2835

3.27525

3.267

V

O

V (1V/div)

I

TPS7A8101-Q1

SLVSCK0A – APRIL 2014 – REVISED JUNE 2014

www.ti.com

Typical Characteristics (continued)

At VOnom = 3.3 V, VI = VOnom + 0.5 V or 2.2 V (whichever is greater), IO = 100 mA, V(EN) = VI, C(IN) = 1 μF, C(OUT) = 4.7 μF, and

C(NR) = 0.01 μF; all temperature values refer to TJ, unless otherwise noted.

VI = 3.8 V → 4.8 V → 3.8 V

Using the same value of C(NR) and C(BYPASS) in the X-Axis

IO = 500 mA

Figure 25. Startup Time vs Noise Reduction Capacitance

Figure 26. Line Transient Response

RL = 33 Ω

C(NR) = 470 nF

C(BYPASS) = 470 nF

IO = 100 mA → 1 A → 100 mA

C(OUT) = 10 µF

C(IN) = 10 µF

Figure 28. Enable Pulse Response, see (1) in Figure 29

Figure 27. Load Transient Response

RL = 33 Ω

C(NR) = 470 nF

C(BYPASS) = 470 nF

C(OUT) = 10 µF

C(IN) = 10 µF

(1) The internal reference requires approximately 80 ms of rampup

time (see Startup) from the enable event; therefore, VO fully reaches

the target output voltage of 3.3 V in 80 ms from startup.

Figure 29. Power-Up and Power-Down Response

10

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