FS26 datasheet(101/156 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

CORE_ILIM_OTP[1:0] = 01, 10 or 11

1.15

1.7

2.3

VCORE inductor peak current limitation for FS262x and FS263x

ICORE_PEAK_1A65

CORE_ILIM_OTP[1:0] = 00

CORE_ILIM_OTP[1:0] = 01

CORE_ILIM_OTP[1:0] = 10

CORE_ILIM_OTP[1:0] = 11

0.9

1.15

2.0

2.5

1.4

1.7

2.7

3.4

1.9

2.2

3.4

4.3

ηCORE_PEAK

Peak efficiency in PWM mode

VPRE_PWM = 5.5 V, VCORE = 1.5 V, ICORE = 800 mA

LCORE = 1 µH with DCR = 30 mΩ

COUT_CORE = 20 µF (effective capacitance)

—

RHS_CORE

High-side on-resistance

(VBOS = 5 V, including bonding)

—

150

mΩ

RLS_CORE

Low-side on-resistance

(VBOS = 5 V, including bonding)

—

150

mΩ

RCORE_DIS

Discharge resistor (when VCORE is disabled – LP OFF)

100

200

Ω

TSDCORE

Thermal shutdown threshold

175

—

°C

TSDCORE_HYS

Thermal shutdown threshold hysteresis

—

°C

Dynamic electrical characteristics

Dead time to avoid cross conduction

tVCORE_DEAD

COREHS_SR_OTP[1:0] = 01

COREHS_SR_OTP[1:0] = 10

COREHS_SR_OTP[1:0] = 00 or 11

—

Switching node slew rate (rising)

tCORESW_HSSRR[1]

COREHS_SR_OTP[1:0] = 00

COREHS_SR_OTP[1:0] = 01

COREHS_SR_OTP[1:0] = 10

COREHS_SR_OTP[1:0] = 11

2.5

2.25

2.5

4.5

—

V/ns

Switching node slew rate (falling)

tCORESW_HSSRF[1]

COREHS_SR_OTP[1:0] = 00

COREHS_SR_OTP[1:0] = 01

COREHS_SR_OTP[1:0] = 10

COREHS_SR_OTP[1:0] = 11

0.25

0.5

2.2

0.6

1.2

2.2

—

V/ns

Soft start ramp rate from 10 % to 90 % (DVS up and down)

VCORE_SS

CORE_SS_OTP[1:0] = 00

CORE_SS_OTP[1:0] = 01

CORE_SS_OTP[1:0] = 10

CORE_SS_OTP[1:0] = 11 (COUT_CORE < 80 μF nominal)

2.5

mV/µs

VCORE_LOTR1

Transient load response for VCORE ≥ 1.0 V

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

with di/dt = 300 mA/µs, COUT_CORE ≥ 22 µF, LCORE = 1.0 µH

-3

—

VCORE_LOTR2

Transient load response for VCORE ≤ 1.0 V

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

with di/dt = 300 mA/µs, COUT_CORE ≥ 40 µF, LCORE = 1.0 µH

-30

—

FCORE

Operating frequency in PWM mode

2.0

2.25

2.50

MHz

tCORE_ONOFF_MIN_P

HS minimum ON and OFF time in peak current mode

Table 106. VCORE 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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