TPS54290, TPS54291, TPS54292

SLUS973 – OCTOBER 2009

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DESIGN EXAMPLES

Design Example 1

The following example illustrates the design process and component selection for a 12-V to 5-V and 3.3-V dual

non-synchronous buck regulator using the TPS54291 converter. A definition of symbols used can be found in

Table 1 of the appendix

Table 1. Design Example Electrical Characteristics

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

INPUT CHARACTERSTICS

Input voltage

8

12

14

V

Input current

A

No load input current

12

20

mA

Input UVLO

4

4.2

4.4

V

OUTPUT CHARACTERSTICS

Output voltage 1

3.2

3.3

3.4

V

Output voltage 2

1.15

1.20

1.25

V

Line regulation

VIN = Min to Max

1%

Load regulation

1%

Output1 voltage Ripple

50

Output2 voltage Ripple

24

Output current 1

0

1.5

A

Output current 2

0

2.5

A

Output overcurrent Channel 1

1.8

2.2

2.6

A

Output overcurrent Channel 2

3.2

3.8

4.6

A

TRANSIENT RESPONSE

Change from load transient

200

mV

Settling time

1

ms

SYSTEMS CHARACTERSTICS

Switching frequency

500

600

700

kHz

Peak efficiency

90%

η

Full load efficiency

80%

Operating temperature range

0

25

60

°C

20

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