FS23 datasheet(33/230 Pages) NXP

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NXP Semiconductors

FS23

Safety system basis chip (SBC) with power management, CAN FD and LIN transceivers

13 Power management

Regulator

Type

Input Supply

Output Range

Max DC current

HV Buck regulator

V1_IN

(VBUCK / DCmax_drop + ((RHS_BUCK + RDCR_

LBUCK) x IBUCK x DCmax_drop) to 36 V)

600 mA

HV Linear regulator

V1_IN

(4 V or V1 + 500 mV to 40 V)

3.3 V or 5.0 V

100 mA/250 mA

HV Linear regulator

V2_IN

(4 V or V2 + 500 mV to 40 V)

3.3 V or 5.0 V

100 mA

HV Linear regulator

V3_IN

(4 V or V3 + 500 mV to 40 V)

3.3 V or 5.0 V

150 mA

Table 13. FS23 regulators list

The FS23 includes three regulators, all supplied in parallel from the battery line. Depending on the part number,

the V1 regulator can be a BUCK regulator or a linear regulator.

The FS23 starts when VSUP > VSUP_UV, with VBOS first, followed by V1, then the power-up sequencing

configured by OTP for the remaining regulators (LDO2, LDO3).

13.1 HVBUCK: High-voltage buck regulator

13.1.1 Functional description

HVBUCK block is a high-voltage integrated synchronous buck. It can be used to supply the ECU MCU and

other local loads inside the ECU.

General operation

The HVBUCK operates in force PWM or PFM modes and uses internal N-type FETs. The output voltage is

configurable by OTP. Compensation is ensured by internal circuitry.

The current in the inductor is sensed via the internal FETs. This information is used to compute an average

value reflecting the output DC current.

Mode-specific operation

HVBUCK operates in force PWM (pulse width modulation) when the FS23 is in Normal mode and in PFM

(pulsed frequency modulation) when the FS23 is in Low-Power ON mode (LPON). HVBUCK output voltage can

be different in Normal mode and in LPON mode. The voltage ramp-up/down between the normal and the LPON

voltages is done in PWM mode.

Switching frequency

HVBUCK switching frequency in force PWM mode is configurable at 450 kHz or 2.25 MHz by OTP, using

BUCK_CLK_OTP bit.

Current limitation

HVBUCK has current limitation protection features. In PWM mode, HVBUCK has both peak and average

current limitations, configurable by OTP using BUCK_PK_OC_PWM_OTP and BUCK_AVG_OC_PWM_OTP

fields. In PFM mode, HVBUCK has a peak current limitation, as well configurable by OTP using

BUCK_PK_OC_PFM_OTP field.

When HVBUCK current reaches one of these current limitations, V1OC_I flag is set. The regulator stays

enabled, but it induces a duty cycle reduction and therefore an output voltage drop, which could lead to an

undervoltage detection (V1UV_I flag generated).

FS23

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 7.0 — 16 October 2024

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