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NXP Semiconductors MC33FS8520A0ES
- Part No.:
- MC33FS8520A0ES
- Manufacturer:
- NXP Semiconductors
- Category:
- Power Management - Specialized
- Package:
- 56-VFQFN Exposed Pad
- Datasheet:
-
MC33FS8520A0ES.pdf
- Description:
- SAFETY POWER MANAGEMENT IC, QFN5
- Quantity:
- Payment:
- Shipping:
Inventory:4,672
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Product details
Overview
MC33FS8520A0ES from NXP Semiconductors is an ASIL D–compliant automotive fail-safe system basis chip (SBC) integrating a VPRE synchronous buck controller, two low-voltage synchronous BUCK converters (BUCK1 and BUCK2), one BOOST converter, and two LDOs. It delivers up to 3.6 A peak per BUCK rail, supports 60 V DC input, and features SPI/I²C control with CRC, fail-safe output, and power synchronization (PSYNC). It targets radar and ADAS domain controllers requiring functional safety and multi-rail power sequencing.
For engineers reviewing the MC33FS8520A0ES datasheet, MC33FS8520A0ES pinout, MC33FS8520A0ES application, or MC33FS8520A0ES equivalent, this device requires attention to its dual-BUCK configuration (BUCK1 + BUCK2 enabled), ASIL D safety architecture, OTP-programmed power-up sequencing slot assignments, and HVQFN56 wettable flank package for automotive-grade reflow and inspection.
Technical Context
The MC33FS8520A0ES implements a hierarchical safety architecture with independent monitoring circuitry, dedicated FCCU inputs for MCU error detection, and a fail-safe state machine that asserts FS0B on fault detection. Its power management includes configurable switching frequencies (455 kHz force-PWM or 2.22 MHz), phase-shifting capability between BUCK1 and BUCK2 for current sharing, and thermal shutdown with DFS (fail-safe disable sequence).
It supports external frequency synchronization via FIN/FOUT pins and PSYNC for multi-device coordination, integrates spread spectrum and slew rate control for EMC optimization, and uses analog multiplexing (AMUX) for real-time voltage/temperature monitoring via MCU ADC - all under ISO 26262 ASIL D development compliance and AEC-Q100 Grade 1 qualification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ASIL Level | ASIL D compliant per ISO 26262, with dedicated monitoring paths and fail-safe output driver |
| Input Voltage Range | 60 V DC max input supports 12 V and 24 V automotive battery systems with reverse-battery protection diodes required on VSUP1/VSUP2 |
| BUCK1 Output | Configurable 1.025 V to 1.8 V, 4.5 A peak, 2.22 MHz switching, soft-start slope 7.81 mV/µs |
| BUCK2 Output | Enabled per FS8520 option: 1.25 V or 1.8 V, 4.5 A peak, 2.22 MHz, multiphase-capable with BUCK1 |
| LDO Outputs | Two independent LDOs: LDO1 (1.2–5.0 V, 400 mA), LDO2 (1.2–5.0 V, 400 mA), both with TSD shutdown + DFS |
| Interface | SPI or I²C (0x20 address), CRC-protected commands, 32-bit register access, and debug mode entry via DBG pin |
| Package | HVQFN56, 8 mm × 8 mm × 0.85 mm, wettable flank (ES suffix), MSL3, AEC-Q100 Grade 1 qualified |
Pinout & Package
HVQFN56 plastic thermal enhanced very thin quad flat package with 56 terminals, 0.5 mm pitch, exposed pad (EP) connected to GNDFS/GND for thermal and electrical integrity. Wettable flank (ES) enables automated optical inspection (AOI) of solder joints.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| VSUP1 / VSUP2 | Main power inputs | 60 V tolerant inputs requiring external reverse-battery diodes; supply internal regulators and gate drivers |
| BUCK1_IN / BUCK2_IN | Low-voltage input rails | Accept regulated intermediate voltages (e.g., from VPRE); each feeds respective synchronous buck stage |
| BUCK1_SW / BUCK2_SW | Switching nodes | Connect to external inductors and low-side MOSFETs (for BUCK1) or integrated switches (for BUCK2) |
| VCOREMON / VMON1–VMON4 | Voltage monitoring inputs | Monitor BUCK1 output (VCOREMON) and up to four external rails; enable OV/UV detection with programmable thresholds and deglitch times |
| FS0B | Fail-safe output | Active-low open-drain signal asserting system-level fail-safe state on detected fault or watchdog timeout |
| PSYNC | Power sync I/O | Enables synchronized switching across multiple MC33FS8520A0ES or with external PMICs to reduce system EMI peaks |
| SPI/I²C pins (MISO/MOSI/SCLK/CSB, SCL/SDA) | Digital interfaces | Provide configuration, status readback, and real-time control; include CRC for command integrity |
| WAKE1 / WAKE2 | Wake-up inputs | Edge-triggered inputs supporting low-power OFF mode (10 µA typ); require external series resistors if used as global wake sources |
Key Features
| Feature | Design Value |
|---|---|
| ASIL D Safety Architecture | Dedicated fail-safe state machine, independent monitoring circuits (FCCU1/FCCU2), and hardware-based self-test (ABIST/LBIST) ensure diagnostic coverage >90% for safety-critical functions |
| Multi-Rail Power Sequencing | Configurable start/stop slots (e.g., BUCK1 in Slot 0, BUCK2 in Slot 6) enable precise timing control for MCU core and IO supply ramp-up/down |
| EMC Optimization | Integrated spread spectrum, slew rate control, manual frequency tuning, and FIN/FOUT synchronization reduce conducted/emission peaks across 150 kHz–108 MHz bands |
| OTP Configuration Flexibility | Factory-programmed OTP defines BUCK/LDO voltages, current limits, sequencing order, and safety feature enablement - eliminating external configuration components |
| Thermal Fault Handling | Per-rail thermal shutdown triggers individual regulator disable plus DFS (fail-safe disable sequence), preserving system observability during overtemperature events |
Applications
| Radar Sensor Power Management | ADAS Domain Controller Supply |
|---|---|
Use Scenario: Powers NXP S32R274/S32R294 radar SoCs with precise VCORE (1.025–1.8 V) and VDDIO (1.2–3.3 V) rails while meeting ASIL D requirements. IC Role / Device Role: Primary SBC delivering regulated BUCK1 (core), BUCK2 (IO), LDO1 (ADC reference), and BOOST (PHY bias) with fail-safe supervision. Use Value: Eliminates discrete power ICs and safety monitors; reduces BOM count by 4+ components while enabling single-chip functional safety compliance. | Use Scenario: Supplies multi-core domain controllers (e.g., S32G) requiring independent, sequenced rails for CPU clusters, GPU, and high-speed interfaces (PCIe, Ethernet). IC Role / Device Role: Centralized power manager coordinating BUCK1 (1.031 V @ 4.5 A), BUCK2 (1.8 V @ 4.5 A), LDO2 (3.3 V @ 400 mA), and PSYNC-synchronized secondary PMICs. Use Value: Enables deterministic power-up timing across heterogeneous subsystems and simplifies ISO 26262 FMEDA by consolidating safety mechanisms into one qualified component. |
| Vision System Camera Module | Automotive Infotainment Head Unit |
Use Scenario: Powers S32V-based mono/stereo camera modules with low-noise LDOs for image sensor analog supply and BUCKs for ISP core voltage. IC Role / Device Role: Dual-BUCK + dual-LDO SBC providing VCORE (1.25 V), VDDIO (1.8 V), LDO1 (2.5 V for sensor bias), and LDO2 (3.3 V for MIPI PHY). Use Value: Meets stringent PSRR (<−60 dB at 100 kHz) and ripple (<10 mVpp) requirements for pixel-level image fidelity without external LC filtering. | Use Scenario: Supplies application processor, display interface, audio codec, and CAN transceiver in head units with varying voltage and sequencing needs. IC Role / Device Role: Configurable SBC delivering BUCK1 (1.1 V @ 4.5 A), BUCK2 (1.8 V @ 4.5 A), LDO1 (5.0 V @ 400 mA for USB PHY), and LDO2 (3.3 V @ 400 mA for CAN transceiver). Use Value: Reduces layout complexity by integrating 6 power rails and safety monitoring into one 8 mm × 8 mm footprint, easing thermal management in confined enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fail-safe multi-rail power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC33FS8530A0ES | Includes BUCK3 (1.2–3.3 V, 2.6–4.5 A) and full 4× VMON support; identical ASIL D safety architecture and pinout | Required when third BUCK rail needed for auxiliary processors, memory, or high-current peripherals | Select MC33FS8530A0ES only if BUCK3 functionality is required; otherwise MC33FS8520A0ES offers lower cost and reduced thermal load |
| MC33FS8420G0ES | ASIL B rated; same BUCK1/BUCK2 topology but lacks FCCU, deep fail-safe autoretry, and ABIST; shares HVQFN56 package and pin compatibility | Suitable for non-safety-critical body electronics or gateway modules where ASIL D is not mandated | Choose MC33FS8420G0ES for cost-sensitive ASIL B designs; avoid for radar/ADAS where diagnostic coverage and fail-safe assertion are mandatory |
Compared with MC33FS8530A0ES, MC33FS8520A0ES removes BUCK3 to reduce solution size and cost while retaining full ASIL D compliance for dual-rail radar/ADAS use cases; versus MC33FS8420G0ES, it adds critical ASIL D monitoring, fail-safe output behavior, and diagnostic test coverage essential for safety-harsh environments.
Availability
MC33FS8520A0ES is available at Aetrix Electronics and suitable for radar sensor modules, ADAS domain controllers, and vision system camera applications requiring stable component supply, long-term automotive lifecycle support, and AEC-Q100 qualified performance.
Supply support for MC33FS8520A0ES includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
NXP Semiconductors is a global semiconductor company specializing in secure connectivity solutions for automotive, industrial, and IoT markets, with leadership in functional safety and radar processing technologies.
The MC33FS8520A0ES belongs to NXP's FS85 family of fail-safe system basis chips, designed specifically to consolidate power management, safety monitoring, and communication interfaces for next-generation ASIL D–compliant ADAS and autonomous driving systems.
FAQ
What safety certifications does the MC33FS8520A0ES hold?
The MC33FS8520A0ES is developed in full compliance with ISO 26262 ASIL D requirements and qualified to AEC-Q100 Grade 1 (−40 °C to +125 °C ambient) with MSL3 moisture sensitivity level. It includes built-in ABIST/LBIST, dedicated FCCU inputs, and hardware-enforced fail-safe state transitions - all verified through NXP's certified functional safety workflow. The MC33FS8520A0ES documentation package includes FMEDA reports and safety manuals for integration into ASIL D systems.
How does the MC33FS8520A0ES handle power sequencing for BUCK1 and BUCK2?
The MC33FS8520A0ES implements configurable power sequencing via OTP-programmed start/stop slots: BUCK1 is assigned to Slot 0 and BUCK2 to Slot 6, ensuring BUCK1 powers up first and remains active until BUCK2 completes its soft-start. Each rail uses independent DVS (dynamic voltage scaling) with 7.81 mV/µs ramp rate, and sequencing is enforced by the internal state machine - no external timing components required. This behavior is fixed for the MC33FS8520A0ES variant and cannot be altered post-OTP programming.
Can the MC33FS8520A0ES synchronize switching with other power ICs?
Yes, the MC33FS8520A0ES supports system-level EMC optimization through three synchronization methods: FIN/FOUT pins for daisy-chained frequency alignment, PSYNC pin for bidirectional power sync with another MC33FS8520A0ES or external PMIC, and spread spectrum modulation to reduce spectral peaks. All synchronization is hardware-automated and requires no firmware intervention - enabling deterministic jitter reduction across multi-rail automotive power trees.
What is the role of the FS0B pin on the MC33FS8520A0ES?
The FS0B pin on the MC33FS8520A0ES is an active-low, open-drain fail-safe output that asserts during detected faults including thermal shutdown, overvoltage/undervoltage on monitored rails (VCOREMON, VMON1–VMON4), watchdog timeout, or FCCU error input assertion. It drives external safety-critical logic (e.g., MCU reset, contactor disable) and remains latched until cleared via SPI command or power cycle. Its behavior is integral to the MC33FS8520A0ES ASIL D safety architecture and cannot be disabled.
Does the MC33FS8520A0ES support both SPI and I²C interfaces simultaneously?
No, the MC33FS8520A0ES supports either SPI or I²C - not both concurrently. Interface selection is determined at power-on by the state of the DBG pin: high enables SPI (MISO/MOSI/SCLK/CSB), low enables I²C (SCL/SDA). Both interfaces provide full 32-bit register access, CRC-protected commands, and identical configuration capabilities; however, only one can be active per power cycle. This design prevents bus contention and simplifies PCB routing for the MC33FS8520A0ES.
MC33FS8520A0ES Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 56-VFQFN Exposed Pad
- Packaging:
- Tray
- Product Status:
- Active
- Applications:
- System Basis Chip
- Current - Supply:
- 15mA
- Voltage - Supply:
- 60V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 56-HVQFN (8x8)
MC33FS8520A0ES FAQ
1.How can I place an order for MC33FS8520A0ES through Aetrix?
Please submit a Request for Quotation (RFQ) for MC33FS8520A0ES on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MC33FS8520A0ES reliable?
The price and inventory of MC33FS8520A0ES are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33FS8520A0ES is usually 5 days.
3.What payment methods are accepted for MC33FS8520A0ES?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33FS8520A0ES transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC33FS8520A0ES?
MC33FS8520A0ES orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC33FS8520A0ES order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MC33FS8520A0ES?
For technical support, including MC33FS8520A0ES datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33FS8520A0ES requirements.
6.How does Aetrix verify that MC33FS8520A0ES is sourced from the original manufacturer or authorized distributors?
All MC33FS8520A0ES products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MC33FS8520A0ES meets industry standards.
7.What is the process for return or replacement of MC33FS8520A0ES?
All MC33FS8520A0ES units undergo pre-shipment inspection (PSI). If there is an issue with MC33FS8520A0ES, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MC33FS8520A0ES part is unused and in its original packaging.
Return procedure for MC33FS8520A0ES:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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