Datasheet

TPS5450
www.ti.com SLVS757C –MARCH 2007–REVISED OCTOBER 2013
Application Circuits
Figure 11 shows the schematic for a typical TPS5450 application. The TPS5450 can provide up to 5-A output
current at a nominal output voltage of 5 V. For proper thermal performance, the exposed PowerPAD™
underneath the device must be soldered down to the printed-circuit board.
Figure 11. Application Circuit, 12-V to 5.0-V
Design Procedure
The following design procedure can be used to select component values for the TPS5450. Alternately, the
Designer Software may be used to generate a complete design. The Designer Software uses an iterative design
procedure and accesses a comprehensive database of components when generating a design. This section
presents a simplified discussion of the design process.
To begin the design process a few parameters must be decided upon. The designer needs to know the following:
• Input voltage range
• Output voltage
• Input ripple voltage
• Output ripple voltage
• Output current rating
• Operating frequency
Design Parameters
For this design example, use the following as the input parameters:
DESIGN PARAMETER
(1)
EXAMPLE VALUE
Input voltage range 10 V to 31 V
Output voltage 5 V
Input ripple voltage 400 mV
Output ripple voltage 30 mV
Output current rating 5 A
Operating frequency 500 kHz
(1) As an additional constraint, the design is set up to be small size and low component height.
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