FS26 datasheet(109/156 Pages) NXP

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NXP Semiconductors

FS26

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

18.7 TRK1 and TRK2: voltage tracking regulators

TRK1 and TRK2 are linear voltage regulators following a known voltage reference. The output voltage of the

tracking regulators can track either VREF, LDO2, or an internal LDO reference.

TRK1 and TRK2 are intended to supply sensors located outside the ECU, therefore each voltage tracker is

independently protected against short circuit to ground and short circuit to battery. An overcurrent detection and

a thermal shutdown protection are integrated in each tracker.

When the output current rises above the ILIM_TRKx threshold, the corresponding SPI bit TRKxOC_I is set. An

overcurrent detection does not turn OFF the corresponding tracker but will induce an output voltage drop.

aaa-045470

TRK1 AND TRK2

LDO

TRACKER #1

TRK1

TRKIN

VTRK1

VTRKIN

INTRK1

SET1

COUT_TRK1

LDO

TRACKER #2

TRK2

VTRK2

INTRK2

2 % INTERNAL

LDO (1.2 V, 1.8 V,

3.3 V or 5.0 V)

VREF

(3.3 V or 5.0 V)

LDO2

(3.3 V or 5.0 V)

OUT

OTP

LDOIN

VREF

SET2

LDO2

COUT_TRK2

Figure 33. TRK1 and TRK2 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 conditions

VTRKIN

Input reference voltage range

VTRKx + VTRKx_HDR

—

6.35

VTRKx_HDR_125

Minimum headroom (VTRKIN – VTRKx) for ITRKx = 125 mA

350

—

VTRKx_HDR_150

Minimum headroom (VTRKIN – VTRKx) for ITRKx = 150 mA

500

—

Output voltage

VTRKx

VSETx = VREF = 3.3 V

VSETx = VREF = 5.0 V

VSETx = Internal LDO = 1.2 V

VSETx = Internal LDO = 1.8 V

VSETx = Internal LDO = 3.3 V

VSETx = Internal LDO = 5.0 V

VSETx = VLDO2 = 3.3 V

VSETx = VLDO2 = 5.0 V

—

3.3

5.0

1.2

1.8

3.3

5.0

3.3

5.0

—

VTRKx_ACC

Tracker output voltage accuracy when VSETx = Internal LDO

-2

—

VTRKx_OFF

Offset voltage between tracker output voltage and tracking reference

(VTRKx - VSETx)

VSETx = VREF or VLDO2

0 mA < ITRKx < 150 mA

-10

—

Table 110. TRKx 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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