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MFS2301BMBACEP Datasheet(PDF) 33 Page - NXP Semiconductors |
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MFS2301BMBACEP Datasheet(HTML) 33 Page - NXP Semiconductors |
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33 / 230 page  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 V1 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 V2 HV Linear regulator V2_IN (4 V or V2 + 500 mV to 40 V) 3.3 V or 5.0 V 100 mA V3 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. © 2024 NXP B.V. All rights reserved. Product data sheet Rev. 7.0 — 16 October 2024 Document feedback 33 / 230 |
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