FS4500 datasheet(59/153 Pages) NXP

59 / 153 page

NXP Semiconductors

FS6500-FS4500-ASILD

Safety power system basis chip with CAN FD and LIN transceivers

IPRE_OC

IPRE_LIM

IPRE_SW

SW_PRE

TPRE_BLK_ILIM

TPRE_OC

VPRE

aaa-037771

Figure 42. Overcurrent and current limitation scheme

12.7.1.6 VPRE voltage monitoring

The overvoltage detection switches off the regulator. The undervoltage detector is disabled when the regulator

is switched off, reporting an undervoltage. Diagnostic is reported in the dedicated register and generates

an Interrupt. The undervoltage detection does not switch off the regulator. However, VPRE decrease may

induce an undervoltage on a regulator attached to VPRE (VCORE, VCCA, VAUX, or CAN_5V), and bring the

application in fail-safe state depending on the supervisor configuration (registers INIT_VCORE_OVUV_IMPACT,

INIT_VCCA_OVUV_IMPACT, INIT_VAUX_OVUV_IMPACT).

12.7.1.7 VPRE efficiency

VPRE efficiency versus current load is given for information based on typical external component criteria

described in Figure 43, close to the graph and at typical automotive VSUP voltage(14 V). The efficiency is valid

in buck mode only and above a 200 mA load on VPRE, to be in continuous mode on the 22 µH inductor. The

efficiency is calculated and has to be verified by measurement at the application level.

FS6500-FS4500-ASILD

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 8 — 5 August 2024

Document feedback

59 / 153

FS4500 Datasheet(PDF) 59 Page - NXP Semiconductors