Data Sheet

LT8277

analog.com

Rev 0

19 of 31

Figure 32. LT8277 DCR Current Sensing

������������,������������������ =

75mV

������������,������������������

A

(7)

������������������������ =

������

������������,������������������

(8)

This relationship is underspecified, so pick a reasonable pair of R and C values.

Power NMOS Selection

Select a power NMOS for use with LT8277 with a maximum drain-source voltage rating higher than the programmed

output voltage and Schottky forward voltage. An additional margin of 10V is recommended. The continuous forward

current rating of the switch should exceed the programmed inductor current limit. Keep power dissipation capability

in mind for high-power applications. A table of manufacturers appears in Table 8.

Table 8. Recommended Power NMOS Vendors

NAME

WEBSITE

Vishay

www.vishay.com

Infineon

www.infineon.com

Renesas

www.renesas.com

ON Semiconductor

www.onsemi.com

Schottky Rectifier Selection

Select a Schottky rectifier for use with the LT8277 with a reverse voltage rating higher than the intended output

voltage target. An additional margin of 10V is recommended. The rectifier should have an average forward current

rating greater than ILIM(OUTPUT)/n, where n is the number of phases, and an instantaneous forward current rating higher

than the programmed inductor current limit. A table of manufacturers appears in Table 9.

Table 9. Recommended Schottky Vendors

NAME

WEBSITE

Vishay

www.vishay.com

ON Semiconductor

www.onsemi.com

Diodes, Inc.

www.diodes.com

Central Semiconductor

www.centralsemi.com

NXP

www.nxp.com

VIN

RS

CS

Lx

LT8277

SNSPx

SNSNx