TPS54122 datasheet(10/40 Pages) TI

No. de pieza	TPS54122

Descripción Electrónicos	TPS54122-Q1 Dual-Output, 3-A, QuietSupply??with Integrated DC-DC Converter and Low-Noise LDO

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Fabricante Electrónico	TI [Texas Instruments]

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1.05

1.1

1.15

1.2

1.25

1.3

1.35

±40

±20

0

20

40

60

80

100

120

140

Temperature (

C)

Enable Pin Low-Level Voltage (V)

Enable Pin High-Level Voltage (V)

C006

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

5

±40

±20

0

20

40

60

80

100

120

140

Temperature (

C)

Ven =1.3

Ven =1.13

C010

0

1

2

3

4

5

6

7

8

Time (200 ms/div)

Vvin

Vdc-dc_out

Vout

C015

-50

-25

0

25

50

75

100

125

150

Junction Temperature (°C)

450

455

460

465

470

475

480

485

490

495

500

-0.03

-0.02

-0.01

0

0.01

1

1.5

2

2.5

3

3.5

4

4.5

5

Time (20 µs/div)

C021

V

OUT Deviation

I

OUT = 1.5 A to 2.5 A to 1.5 A (1 A/µs)

0

0.5

1

1.5

2

2.5

3

Time (20 ms/div)

Ven (V)

Vout (V)

C019

TPS54122-Q1

SBVS253A – JANUARY 2015 – REVISED MAY 2015

www.ti.com

Typical Characteristics (continued)

At VVIN = VBIAS= VLDOEN= 5 V, VLDOIN = DC-DC_OUT = 2.1 V, VO = 1.8 V, IO = 50 mA, VEN = floating, COUT = 100 μF, and CSS =

CNR = 0.01 µF (see Figure 27), unless otherwise noted.

RLOAD = 1.8 Ω

Figure 13. DC-DC Load Transient Response

Figure 14. LDO Enable Pulse Response

RT = 400 k

Ω, VI = 5 V

VEN = VVIN, VLDOEN = VDC-DC_OUT

Figure 16. DC-DC Switching Frequency vs Temperature

Figure 15. Power-Up and Power-Down Response

(LDO Powered by DC-DC)

Figure 17. DC-DC EN UVLO Threshold vs Temperature

Figure 18. Enable Pin Current vs Temperature

10

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