1

2

3

4

5

6

7

8

0.1µF

RT

Top Layer Ground Plane

Top Layer Traces

Pad to Top Layer Ground Plane

Connection to Power Supply

CT

RL

C1

C2

CIN

OUT

IN

Vcc

Vcc

Short traces to external

components

Decoupling capacitor

placed as close as possible

to the device

LMC567

Ground Plane that gives low

impedance return path

LMC567

SNOSBY1C – JUNE 1999 – REVISED DECEMBER 2015

www.ti.com

11 Power Supply Recommendations

The LMC567 is designed to operate with an input power supply range between 2 V and 9 V. Therefore, the

output voltage range of power supply must be within this range and well regulated. The current capability of

upper power must not exceed the maximum current limit of the power switch. Because the operating frequency

of the device could be very high for some applications, the decoupling of power supply becomes critical, so is

required to place a proper decoupling capacitor as close as possible to VCC pin. Low equivalent-series-

resistance (ESR) ceramic capacitor, typically 0.1 µF, is typically used. This capacitor must be placed within 2 mm

of the supply pin.

12 Layout

12.1 Layout Guidelines

The VCC pin of the LM567 must be decoupled to ground plane as the device can work with high switching

speeds. The decoupling capacitor must be placed as close as possible to the device. Traces length for the timing

and external filter components must be kept at minimum in order to avoid any possible interference from other

close traces.

12.2 Layout Example

Figure 10. LMC567 Board Layout

12

Submit Documentation Feedback

Copyright © 1999–2015, Texas Instruments Incorporated

Product Folder Links: LMC567