LM5176: Layout review about LM5176

Hi Gary,

thank you for supporting the LM5176.

Note: based on your request i just checked the layout but did not review the schematic.

Layout

(In below list items which should be checked again have been marked bold)

Vcc Cap close to pins

AGND and PGND connected at Thermal pad - no

Via's in Thermal pad: Thermal Pad could get more via's to better distribute power loss of the LM5176

AGND island
  -> a AGND power area help to avoid disturbances injected into the AGND related components

Kelvin connection to CS/CSG sense resistor

Kelvin connection to ISNS+/- sense resistor (shorted to GND if not used)

Small current loop for HDRV1/SW1 (best if wires are on top of each other)

Small current loop for HDRV2/SW2  (this one is better)

Input caps close to MOSFET

Output caps close to MOSFET

FB divider close to LM517x

PDF link:
Additional info on layout can be found here :

(1) Four-switch buck-boost layout tip No. 1: identifying the critical parts for layout

(2) Four-switch buck-boost layout tip No. 2: optimizing hot loops in the power stage

(3) Four-switch buck-boost layout tip No. 3: separating differential sense lines from power planes

(4) Four-switch buck-boost layout tip No. 4: routing gate-drive and return paths

Best regards,

 Stefan

Hi Stefan,

 Thanks. Will let you know if we have further question about it.

Best regards,

Gary