RT3624LE datasheet(35/48 Pages) RICHTEK

35 / 48 page

RT3624LE

is a registered trademark of Richtek Technology Corporation

DS3624LE-00

April

2022

www.richtek.com

VIMON-VVREF=(IL1+IL2+…)×

DCR

680

×RIMON,EQ

VIMON - VVREF is proportional to output current. VIMON -

VVREF is used for output current reporting and load-line

loop-control and sum over-current protection. For the

reporting, VIMON - VVREF is averaged by analog

low-pass filter and then coded by 8-bit ADC. The

digitized reporting value is scaled such that FFh =

ICCMAX

. The RIMON, EQ should be designed so that

VIMON - VVREF = VICCMAX while (IL1+IL2+…) =

ICCMAXGTUS = GTUS ICC_MAX register value, where

VICCMAX setting for each rail is shown below :

For GTUS rail,

VICCMAX=0.8V, when ICCMAX>80A

VICCMAX=0.4V, when 80A≥ICCMAX≥40A

VICCMAX=0.2V, when 40A>ICCMAX

For VCCSA rail,

VICCMAX=0.4V, when ICCMAX≥40A

VICCMAX=0.2V, when 40A>ICCMAX

For AUX,

VICCMAX=1.6V for all ICCMAX setting

For load-line loop control, VIMON

− VVREF is scaled by

Ai, that can be selected by Ai[1:0] of PIN-SETTING.

The detailed application is described in the load-line

setting section.

VGTUS

ISEN1P

ISEN1N

DCR

RCS1=680ohm

IL1

ISEN2P

ISEN2N

DCR

IL2

ISEN3P

ISEN3N

DCR

IL3

ISEN4P

ISEN4N

DCR

IL4

IMON

0.6V

VREF

ICS,PER1

ICS,PER2

ICS,PER3

ICS,PER4

RNTC

RIMON,EQ

IIMON4

IIMON3

IIMON2

IIMON1

RCS2=680ohm

RCS3=680ohm

RCS4=680ohm

VIMON

VVREF

Figure 12. Total Current Sense Method

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