3.20

3.25

3.40

4.5

5.0

5.5

6.5

7.0

3.30

3.35

V

I – Input Voltage – V

6.0

0

4

8

I

O (A)

Auto-Skip Mode

f

SW = 330 kHz

0

20

40

60

80

100

Current Mode

V

I = 12 V

R

GV = 18 kW

0.001

0.01

0.1

1

10

I

O1 – 5-V Output Current – A

Auto-Skip

OOA

CCM

Auto-Skip

OOA

CCM

0

20

40

60

80

100

0.001

0.01

0.1

1

10

I

O2 – 3.3-V Output Current – A

V

I = 12 V

Current Mode

R

GV = 12 kW

5.0-V SMPS: ON

V

I = 8 V

Auto-Skip

Current Mode

R

GV = 18 kW

50

60

70

80

90

100

0.001

0.01

0.1

1

10

I

O1 – 5-V Output Current – A

V

I = 12 V

V

I = 20 V

TPS51222

www.ti.com............................................................................................................................................................................................... SLUS908 – JANUARY 2009

TYPICAL CHARACTERISTICS (continued)

3.3-V OUTPUT VOLTAGE

5-V EFFICIENCY

vs

vs

INPUT VOLTAGE

OUTPUT CURRENT

Figure 17.

Figure 18.

5-V EFFICIENCY

3.3-V EFFICIENCY

vs

vs

OUTPUT CURRENT

OUTPUT CURRENT

Figure 19.

Figure 20.

Copyright © 2009, Texas Instruments Incorporated

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