+

PwPd

10.8 - 19.8 V

L1

15 H

m

6

4

9

5

2

3

GND

VSNS

VIN

NC

NC

ENA

BOOT

PH

7

1

8

C1

10 F

m

C3

220 F

m

D1

B340A

C2

0.01 F

m

VOUT

5 V

R2

3.24 kW

R1

10 kW

VIN

EN

U1

TPS5430DDA

Copyright © Texas Instruments Incorporated

14

TPS5430, TPS5431

SLVS632I – JANUARY 2006 – REVISED APRIL 2017

www.ti.com

Product Folder Links: TPS5430 TPS5431

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Copyright © 2006–2017, Texas Instruments Incorporated

(1)

As an additional constraint, the design is set up to be small size and low component height.

8.2 Typical Applications

8.2.1 12-V Input to 5.0-V Output

Figure 9 shows the schematic for a typical TPS5430 application. The TPS5430 can provide up to 3 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 9. Application Circuit, 12 V Input to 5.0 V Output

8.2.1.1 Design Requirements

For this design example, use the following as the input parameters:

EXAMPLE VALUE

Input voltage range

10.8 V to 19.8 V

Output voltage

5 V

Input ripple voltage

300 mV

Output ripple voltage

30 mV

Output current rating

3 A

Operating frequency

500 kHz