Ground

14

13

15

12

11

10

9

1

2

3

4

5

6

7

8

16

C2

VOUT

C1

NC

OUTPUT

NC

GND

NC

FEEDBACK

NC

NC

NC

GND

GND

NC

NC

ON/OFF

NC

VIN

R1

R2

LM2575

www.ti.com

SLVS569F – JANUARY 2005 – REVISED AUGUST 2015

10 Layout

10.1 Layout Guidelines

With any switching regulator, circuit layout plays an important role in circuit performance. Wiring and parasitic

inductances, as well as stray capacitances, are subjected to rapidly switching currents, which can result in

unwanted voltage transients. To minimize inductance and ground loops, the length of the leads indicated by

heavy lines (see Figure 16) must be minimized. Optimal results can be achieved by single-point grounding or by

ground-plane construction. For the same reasons, the two programming resistors used in the adjustable version

must be located as close as possible to the regulator to keep the sensitive feedback wiring short.

Figure 16. Test Circuit and Layout Guidelines

10.2 Layout Example

The large ground copper area helps heat transfer especially when many vias to ground plane are used.

Figure 17. Layout Diagram

Copyright © 2005–2015, Texas Instruments Incorporated

Submit Documentation Feedback

15

Product Folder Links: LM2575