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DESIGN EXAMPLES

Example 1: Detailed Design of a 12-V to 5-V and 3.3-V Converter

TPS54283,, TPS54286

SLUS749C – JULY 2007 – REVISED OCTOBER 2007

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

non-synchronous buck regulator using the TPS54283 converter. Design Example List of Materials and Table 4,

Definition of Symbols is found at the end of this section.

PARAMETER

NOTES AND CONDITIONS

MIN

NOM

MAX

UNIT

INPUT CHARACTERISTICS

VIN

Input voltage

6.9

12.0

13.2

IIN

Input current

VIN = nom, IOUT = max

1.6

2.0

No load input current

VIN = nom, IOUT = 0 A

OUTPUT CHARACTERISTICS

VOUT1

Output voltage 1

VIN = nom, IOUT = nom

4.8

5.0

5.2

VOUT2

Output voltage 2

VIN = nom, IOUT = nom

3.2

3.3

3.4

Line regulation

VIN = min to max

Load regulation

IOUT = min to max

VOUT(ripple

Output voltage ripple

VIN = nom, IOUT = max

mVPP

)

IOUT1

Output current 1

VIN = min to max

2.0

IOUT2

Output current 2

VIN = min to max

2.0

Output overcurrent channel

IOCP1

VIN = nom, VOUT = VOUT1 = 5%

2.4

3.5

Output overcurrent channel

IOCP2

VIN = nom, VOUT = VOUT2 = 5%

2.4

3.5

Transient response

ΔVOUT

ΔIOUT = 1 A @ 3 A/µs

200

from load transient

Transient response settling

time

SYSTEM CHARACTERISTICS

fSW

Switching frequency

250

310

370

kHz

Full load efficiency

85%

Operating temperature

°C

range

Figure 38. Design Example Schematic

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Product Folder Link(s): TPS54283 TPS54286

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