FS26 datasheet(89/156 Pages) NXP

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NXP Semiconductors

FS26

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

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

ηPRE_PWM_PEAK[1]

Efficiency in PFM mode

COUT_PRE = 22 µF with ESR = 2 mΩ, LPRE = 10 µH with RDCR_LPRE =

60 mΩ, FPRE = 450 kHz

VSUP = VSUP_PWR = 12 V and 5.4 V

VPRE_PFM = 5.05 V with IPRE_PFM = 1 mA

VPRE_PFM_TON_OTP[1:0] = 10

—

RHS_PRE

High-side on-resistance

(VBOS = 5 V, including bonding)

—

310

500

mΩ

RLS_PRE

Low-side on-resistance

(VBOS = 5 V, including bonding)

—

170

300

mΩ

RPRE_DIS

Discharge resistor (when VPRE is disabled – LPOFF)

Ω

TSDPRE

Thermal shutdown threshold

175

—

°C

TSDPRE_HYST

Thermal shutdown threshold hysteresis

—

°C

DC overcurrent flag threshold in PWM mode (set VPREOC_I)

IPRE_OC_FLAG[2]

VPRE_OC_OTP[2:0] = 000

VPRE_OC_OTP[2:0] = 001

VPRE_OC_OTP[2:0] = 010

VPRE_OC_OTP[2:0] = 011

VPRE_OC_OTP[2:0] = 100

VPRE_OC_OTP[2:0] = 101

VPRE_OC_OTP[2:0] = 110

VPRE_OC_OTP[2:0] = 111

0.45

0.65

0.85

1.12

1.30

1.49

1.68

1.87

0.66

0.88

1.1

1.32

1.54

1.76

1.98

2.2

1.0

1.25

1.45

1.70

1.95

2.12

2.38

2.64

ILIM_PRE

VPRE output DC current limitation threshold in PWM mode

1.95

2.42

2.9

VPRE_OVP

Main overvoltage protection on VPRE output

(relative to VPRE output voltage setting)

Dynamic electrical characteristics

tPRE_OVP

Overvoltage deglitch time

µs

tPRE_DEAD

Dead time to avoid cross conduction

—

Soft start ramp from 0 % to 100 % defined at IPRE_PWM = 0 A

tPRE_SS

VPRE_SS_OTP[1:0] = 00 (COUT_PRE ≤ 44 μF nominal)

VPRE_SS_OTP[1:0] = 01

VPRE_SS_OTP[1:0] = 10

VPRE_SS_OTP[1:0] = 11

200

431

873

1753

269

538

1077

2150

410

645

1281

2547

µs

DVS down ramp rate during low-power mode transition

VPRE_DVS_DOWN

VPRE_LP_DVS_OTP[1:0] = 00 (COUT_PRE ≤ 44 μF nominal)

VPRE_LP_DVS_OTP[1:0] = 01

VPRE_LP_DVS_OTP[1:0] = 10

VPRE_LP_DVS_OTP[1:0] = 11

4.5

2.25

5.5

2.75

13.5

6.75

3.375

mV/µs

VPRE_LINE_REG_450K_PWM

Transient line in PWM mode with FPRE = 450 kHz

VBAT = 6 V - 18 V – 6 V and 14 V - 35 V - 14 V

IPRE_PWM = 0 A and 1.5 A for VPRE_PWM = 3.3 V

IPRE_PWM = 0 A and 0.6 A for VPRE_PWM = 5.0 V

dV/dt = 100 mV/µs, LPRE = 10 μH,

CIN_PRE = 47 µF + PI filter, COUT_PRE = 44 μF

-1.5

—

1.5

VPRE_LINE_REG_450K_DO

Transient line after drop out exit with FPRE = 450 kHz

VBAT = VPRE_PWM - 0.4 V to 14 V

IPRE_PWM = 0 A and 0.6 A for VPRE_PWM = 5.0 V

dV/dt = 100 mV/µs, LPRE = 10 μH,

CIN_PRE = 47 µF + PI filter, COUT_PRE = 44 μF

-3

—

VPRE_LOTR_450K_PWM

Transient load response in PWM mode with FPRE = 450 kHz

10 mA to 800 mA step and 800 mA to 10 mA step

800 mA to 1.5 A step and 1.5 A to 800 mA step

di/dt = 300 mA/µs, COUT_PRE ≥ 22 µF, LPRE = 10 µH

-3

—

Table 100. VPRE electrical characteristics...continued

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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