TPS54122RHLT datasheet(9/30 Pages) TI1

Part #	TPS54122RHLT

Description	Dual-Output 3-A Quiet Supply with Integrated DC-DC Converter and Low-Noise LDO

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1.05

1.10

1.15

1.20

1.25

1.30

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

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

±40

±20

0

20

40

60

80

100

120

140

Temperature (

C)

V(en) =1.3

V(en) =1.13

C010

0

1

2

3

4

5

6

7

8

Time (200 ms/div)

V(vin)

Vdc-dc_out

V(out)

C015

V

(EN) = V(VIN)

V

(LDOEN) = VDC-DC_OUT

480

485

490

495

500

505

510

515

520

-40

-20

0

20

40

60

80

100

120

140

Temperature (

SC)

C009

0.0

0.5

1.0

1.5

2.0

2.5

3.0

Time (20 ms/div)

V(en) (V)

V(out) (V)

C019

R

LOAD = 1.8

-0.030

-0.020

-0.010

0.000

0.010

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)

TPS54122

www.ti.com

SBVS221A – NOVEMBER 2013 – REVISED NOVEMBER 2013

TYPICAL CHARACTERISTICS (continued)

At V(VIN) = V(BIAS)= V(LDOEN)= 5 V, V(LDOIN) = DC-DC_OUT = 2.1 V, V(OUT) = 1.8 V, I(OUT) = 50 mA, V(EN) = floating,

COUT = 100 μF, and CSS = CNR = 0.01 µF (see Figure 25), unless otherwise noted.

Figure 13. LOAD TRANSIENT RESPONSE

Figure 14. ENABLE PULSE RESPONSE

Figure 15. POWER-UP AND POWER DOWN RESPONSE

Figure 16. DC-DC SWITCHING FREQUENCY vs

TEMPERATURE

Figure 17. DC-DC EN UVLO THRESHOLD vs

Figure 18. ENABLE PIN CURRENT vs TEMPERATURE

TEMPERATURE

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