FS26 datasheet(22/156 Pages) NXP

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NXP Semiconductors

FS26

Safety system basis chip with low power for ASIL D/ASIL B

13.2 Operating range

FS26 operation range is divided in subranges with its own specificities:

• No Operation means the device is not providing the expected functionality or is shut down.

• Low Voltage Extended Operation means the device remains functional but with reduced electrical

performance.

– VPRE may be in drop out mode. VPRE output voltage may decrease below its nominal value and the

transient load will be degraded.

• Full Operation means the device is providing the expected functionality with full electrical performance within

the limits of the data sheet and within the operating mission profile of the safety manual.

• High-voltage Extended Operation means the device is providing the expected functionality with full electrical

performance within the limits of the data sheet but for a limited period of time. This could occur during load

dump or double-battery jump-start events, for example.

• Electrical Characteristics not guaranteed means the device remains functional, but with reduced electrical

performance.

– In Low-power mode, the quiescent current will increase.

– In normal mode, the VPRE thermal limitation may trigger the thermal shutdown. VPRE transient load will be

degraded.

• Risk of damage means the device is overstressed, with a risk of damage to the device.

The ranges are shown in Figure 8 and Figure 9.

13.2.1 Operating range in Normal mode

The FS26 device supports two distinct topologies for boost converter configuration, giving two distinct operating

ranges for the input voltage. When the boost is used as a front-end regulator, a wider input supply range

is supported. When the boost is used as a back-end regulator or is not used, VSUP and VSUP_PWR must be

VPRE_HDR higher than the VPRE output voltage VPRE (VPRE_PWM and / or VPRE_PFM) to ensure full parametric

operation.

Figure 8 describes the supply range of the FS26 with or without the boost used as a front-end or back-end

regulator. Front-end topology should be used to support cold-crank events on the battery input. In the back-end

configuration, full operation is guaranteed when VSUP is higher than VPRE_PWM + VPRE_HDR. (See Section 18.2

for VPRE_HDR).

FS26_SDS

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

Product short data sheet

Rev. 6.0 — 12 December 2025

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FS26 Datenblatt(PDF) 22 Page - NXP Semiconductors