FS26 datasheet(107/156 Pages) NXP

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NXP Semiconductors

FS26

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

18.6 VREF: voltage reference

The VREF block is a high accuracy linear voltage regulator with 0.75 % accuracy over the device operating

voltage and temperature range. The VREF output voltage is selectable between 3.3 V and 5.0 V via OTP, with

30 mA output current capability.

The TRKIN pin is the input voltage supply for VREF, and it is intended to be connected to the VPRE output. An

overcurrent detection is integrated. When the output current rises above the ILIM_REF threshold, the overcurrent

detection does not turn OFF the VREF but will induce an output voltage drop.

VREF is intended to supply the microcontroller ADC reference, and to be the reference for the voltage tracking

regulators (TRKx) in the FS26 device.

VREF

VTRKIN

COUT_VREF

CIN_TRK

aaa-045469

Figure 32. VREF block diagram

TA = –40 °C to 125 °C, unless otherwise specified. VSUP_UVH < VSUP < 36 V, VPRE_PWM + VPRE_HDR < VSUP_PWR < 36 V,

unless otherwise specified. All voltages are referenced to ground.

Symbol

Description

Min

Typ

Max

Unit

Static electrical characteristics

VTRKIN

Input voltage range

VREF +

VREF_HDR

—

6.35

Output voltage

VREF

VREF_OTP = 0

VREF_OTP = 1

—

3.3

5.0

—

VREF_HDR

Minimum headroom (VTRKIN – VREF)

350

—

VREF_ACC

Output voltage accuracy, IREF ≤ 30 mA

-0.75

—

0.75

IREF

Nominal current capability

—

ILIM_REF

Output current limitation

—

RREF_DIS

Discharge resistor (when VREF is disabled)

—

220

Ω

Dynamic electrical characteristics

VREF_SS

Soft start ramp rate from 10 % to 90 %

VREF = 3.3 V

VREF = 5.0 V

3.2

—

mV/µs

PSRRVREF_450kHz

Power supply rejection ratio

VREF_HDR = 350 mV, 100 µA < IREF < 30 mA @

450 kHz

—

PSRRVREF_2.2MHz

Power supply rejection ratio

VREF_HDR = 350 mV, 100 µA < IREF < 30 mA @

2.25 MHz

—

Table 109. VREF electrical characteristics

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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