FS26 datasheet(98/156 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

VBST_LINE_OFF_ON

VBST transient line in front end configuration with OFF/ON transition

VBAT = 12.5 V - 6.5 V

dV/dt = 100 mV/μs , LBST = 4.7 μH, IBST = 0 A and 1 A

CIN_BST_FE = 47 µF, COUT_BST_FE = 50 μF

-5

—

VBST_LINE_ON_OFF

VBST transient line in front end configuration with ON/OFF transition

VBAT = 6.5 V - 12.5 V

dV/dt = 100 mV/μs , LBST = 4.7 μH, IBST = 0 A and 1 A

CIN_BST_FE = 47 µF, COUT_BST_FE = 50 μF

—

1.5

VBST_LOTR_FE

Transient load response in Front end mode

200 mA to 1 A step and 1 A to 200 mA step, di/dt = 800 mA/μs

COUT_BST_FE = 40 µF, LBST = 4.7 μH, CIN_BST_FE = 20 μF

2.7 V ≤ VBST_IN ≤ VBST - 1 V, VBST = 7 V

-10

—

VBST_LOTR_BE

Transient load response in Back end mode

50 mA to 200 mA step and 200 mA to 50 mA step, di/dt = 150 mA/μs

COUT_BST_BE = 22 μF, LBST = 4.7 μH, CIN_BST_BE = 44 μF

VBST_IN = 4.5 V, VBST = 14 V

-5

—

tON_MIN

LS minimum ON time

VBST_TON_MIN_OTP[1:0] = 00

153

200

235

External components

Inductor value

LBST

Nominal[1]

Effective[2]

4.7

3.3

4.7

—

4.7

6.1

µH

LBST_DCR

Inductor DC resistance

—

mΩ

RSNS_BST

Nominal[1] current sense resistor value (±1 %)

—

100

mΩ

DBST

Diode forward voltage drop

—

0.4

—

LSRDSON

Low-side MOSFET RDS(on)

—

mΩ

CIN_BST_FE

Effective[2] input capacitor value for VBST in front-end

—

µF

CIN_BST_BE

Effective[2] input capacitor value for VBST in back-end (in addition to COUT_PRE)

—

µF

COUT_BST_FE

Effective[2] output capacitor value for VBST in front-end

—

150

µF

COUT_BST_BE

Effective[2] output capacitor value for VBST in back-end

—

µF

Table 104. VBST electrical characteristics...continued

[1]

For all regulators, the nominal value is the value normalized.

[2]

For all regulators, the effective value is the value after tolerance, temperature, DC bias and aging removal.

18.3.2 VBST efficiency

VBST efficiency vs. current load measurement is shown in Table 105 based on external components and

the configuration listed below. If the conditions are different, calculate the efficiency using the FS26 power

dissipation tool calculator.

Ext. Components

CIN_BST_BE

µF

CIN_BST_BE_ESR

2.5

mΩ

COUT_BST_BE

µF

COUT_BST_BE_ESR

mΩ

LBST

4.7

µH

LBST_DCR

mΩ

RSNS_BST

mΩ

DBST

0.5

Table 105. VBST efficiency measurement settings

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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