LFC789D25

DUAL LINEAR FET CONTROLLER

SLLS565B − MARCH 2003 − REVISED SEPTEMBER 2004

7

POST OFFICE BOX 655303

APPLICATION INFORMATION

layout

Another benefit of a separate controller and pass element is that the heat dissipated in the external NMOS can

be well isolated from the controller, which has very low power dissipation. Both of these factors allow the

bandgap reference and control circuitry to operate over a more stable temperature range, resulting in very good

accuracy over full-load conditions. The LFC789D25 should be placed as close as possible to the external pass

element because short PCB traces allow minimal EMI coupling to both the drive and sense lines.

For best accuracy, connect the SEN pins as close to the load as possible, not to the source of the NMOS. Also,

place the SEN trace in the same direction and plane as the power trace that connects the source of the NMOS

to the load. Also, it is good practice to keep the load current return path as far as possible from the SEN trace.

Place the 0.1-

The GND pin of the LFC789D25 should be connected to the ground plane.