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NXP Semiconductors MC33FS8520A0KSR2
- Part No.:
- MC33FS8520A0KSR2
- Manufacturer:
- NXP Semiconductors
- Category:
- Power Management - Specialized
- Package:
- 56-VFQFN Exposed Pad
- Datasheet:
-
MC33FS8520A0KSR2.pdf
- Description:
- SAFETY POWER MANAGEMENT IC, QFN5
- Quantity:
- Payment:
- Shipping:
Inventory:4,231
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Product details
Overview
MC33FS8520A0KSR2 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 (FS0B), and power-good/reset signaling for radar and ADAS domain controllers.
For engineers reviewing the MC33FS8520A0KSR2 datasheet, MC33FS8520A0KSR2 pinout, MC33FS8520A0KSR2 application, or MC33FS8520A0KSR2 equivalent, key selection criteria include ASIL D safety certification, multi-rail sequencing capability, integrated fault monitoring (VCOREMON, VMON1–VMON4), EMC-optimized frequency synchronization (FIN/FOUT), and OTP-configurable regulator settings for radar sensor power domains.
Technical Context
The MC33FS8520A0KSR2 implements a dual-phase capable BUCK1/BUCK2 architecture supporting up to 7.2 A peak on a single rail via multiphase operation. Its safety architecture includes independent monitoring circuitry, challenger watchdog, FCCU inputs, ABIST/LBIST, and deep fail-safe autoretry (x15 cycles).
It integrates analog voltage supervision across six channels (VCOREMON, VDDIOMON, VMON1–VMON4), configurable PGOOD/RSTB assertion thresholds, and dedicated pins for external MOSFET gate drive (PRE_GHS/PRE_GLS), bootstrap (PRE_BOOT), and current sensing (PRE_CSP/PRE_FB) in the VPRE controller stage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ASIL Level | ASIL D compliant per ISO 26262, qualified to AEC-Q100 Grade 1 |
| Input Voltage Range | 60 V DC max - 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, 1.25 V output, 4.5 A peak, 2.22 MHz switching, multiphase-capable with BUCK1 |
| LDO Outputs | LDO1: 1.8 V / 400 mA; LDO2: 3.3 V / 400 mA - both support power sequencing in defined slots |
| Fail-Safe Output | FS0B active-low open-drain output, directly controllable by internal state machine during fault conditions |
| Interface | SPI or I²C (0x20 address), CRC-protected commands, 32-bit register access for configuration and status |
Pinout & Package
MC33FS8520A0KSR2 is housed in HVQFN56 package (8 mm × 8 mm × 0.85 mm, 0.5 mm pitch, wettable flank), with exposed thermal pad (EP) connected to GNDFS/GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BUCK1_IN (36) | Power Input | Low-voltage input for BUCK1 regulator; connects to local bulk capacitor |
| BUCK1_SW (37) | Switch Node | High-frequency switching node for external inductor connection |
| BUCK1_FB (39) | Voltage Feedback | Resistive divider input for precise output voltage regulation |
| BUCK2_IN (35) | Power Input | Input for BUCK2; shares input path with BUCK1 in typical layout |
| FS0B (14) | Fault Signal | Fail-safe output - asserts low during internal fault or monitored MCU failure |
| VCOREMON (17) | Monitoring Input | Direct connection to BUCK1 output for core voltage supervision and SVS |
| PSYNC (38) | Sync Interface | Configurable as input or output to synchronize switching frequency with another FS85 or external PMIC |
| FIN (20) / FOUT (24) | EMC Control | Frequency sync input/output pair enabling system-wide spread-spectrum and slew-rate control |
Key Features
| Feature | Design Value |
|---|---|
| ASIL D Safety Architecture | Dedicated monitoring paths, FCCU inputs, ABIST/LBIST, and fail-safe state machine enable full safety partitioning in radar ECU designs |
| Multi-Rail Power Sequencing | Independent start/stop slots for all regulators (BUCK1/2/3, LDO1/2, BOOST) allow precise timing control for MCU core, IO, and peripheral rails |
| VPRE External Buck Controller | Integrated high-side/low-side gate drivers (PRE_GHS/PRE_GLS), bootstrap (PRE_BOOT), and current sense (PRE_CSP) support discrete 10 A peak pre-regulator stage |
| EMC Optimization | Programmable spread spectrum, manual frequency tuning, and FIN/FOUT synchronization reduce radiated emissions in sensitive radar bands |
| OTP Configuration Flexibility | Factory-programmed A0 variant enables engineering-mode customization of voltages, sequencing, and safety thresholds without hardware change |
Applications
| Radar Sensor Power Supply | ADAS Domain Controller |
|---|---|
Use Scenario: Powers NXP S32R274/S32R294 radar SoCs with multiple voltage rails (core, IO, PHY, RF bias). IC Role / Device Role / Timing Role: Primary SBC providing VPRE pre-regulation, BUCK1 for MCU core (1.025 V), BUCK2 for IO (1.25 V), LDO1/LDO2 for ADC/analog blocks, and fail-safe signaling to radar processor. Use Value: Enables ASIL D-compliant power delivery with synchronized switching, thermal derating (TSD shutdown + DFS), and real-time VCOREMON supervision. | Use Scenario: Centralized power management for multi-SoC ADAS domain controllers integrating radar, vision, and vehicle network interfaces. IC Role / Device Role / Timing Role: System basis chip coordinating power-up sequence across heterogeneous processors (e.g., S32G, S32R), managing reset propagation, and monitoring supply integrity via VMON1–VMON4. Use Value: Reduces external component count with integrated BUCK/BOOST/LDOs and eliminates need for discrete watchdog or reset supervisors. |
| Vision Processing Unit | Automotive Infotainment Head Unit |
Use Scenario: Supplies NXP S32V234 camera SoC requiring tightly regulated core (1.03125 V), memory (1.2 V), and IO (1.8 V) rails with fast transient response. IC Role / Device Role / Timing Role: Dual-BUCK regulator delivering BUCK1 (1.03125 V) and BUCK2 (1.25 V) with phase-shifted 2.22 MHz operation to minimize input ripple and EMI. Use Value: Achieves <1% output voltage deviation under 2 A step load with programmable soft-start (7.81 mV/µs) and DVS control. | Use Scenario: Powers infotainment application processors (e.g., i.MX8), display interfaces, audio codecs, and CAN transceivers in head units. IC Role / Device Role / Timing Role: Provides LDO1 (1.8 V) for digital IO, LDO2 (3.3 V) for analog peripherals, and BOOST (5.0 V) for USB PHY or backlight drivers. Use Value: Integrates 400 mA LDOs with independent sequencing slots and PGOOD/RSTB coordination to meet boot timing requirements of complex SoCs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive SBC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC33FS8510A0KSR2 | Single BUCK output (BUCK1 only); no BUCK2; same ASIL D compliance and VPRE controller | Targeted at simpler radar modules or MCU-only systems without dual-core or high-current IO rails | Select when BUCK2 is unnecessary and cost/PCB area optimization is prioritized over multi-rail flexibility |
| MC33FS8530A0KSR2 | Includes BUCK3 (1.2 V, 2.6 A) in addition to BUCK1/BUCK2; identical package and interface | Required for triple-rail systems such as imaging radar with separate core, memory, and interface supplies | Choose when third regulated rail is needed - adds 1.2 V/2.6 A output without changing footprint or firmware interface |
Compared with MC33FS8510A0KSR2 and MC33FS8530A0KSR2, the MC33FS8520A0KSR2 uniquely balances dual-BUCK capability (BUCK1+BUCK2) with ASIL D safety and minimal pin count - making it optimal for mid-tier radar and domain controller designs needing exactly two high-current low-voltage rails.
Availability
MC33FS8520A0KSR2 is available at Aetrix Electronics and suitable for radar sensor modules, ADAS domain controllers, and automotive vision systems requiring stable component supply, long-term automotive qualification, and ASIL D functional safety compliance.
Supply support for MC33FS8520A0KSR2 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 applications.
The FS85 product line delivers ASIL D–certified system basis chips for next-generation radar, vision, and domain controller ECUs - designed to consolidate power management, safety monitoring, and communication interfaces into a single AEC-Q100 qualified device.
FAQ
What safety certifications does the MC33FS8520A0KSR2 hold?
The MC33FS8520A0KSR2 is developed in compliance with ISO 26262 for ASIL D applications and qualified per AEC-Q100 Rev H Grade 1 (−40 °C to +125 °C). It includes built-in self-test (ABIST/LBIST), dedicated FCCU monitoring inputs, challenger watchdog, and fail-safe output (FS0B) to support end-system safety goals in radar and ADAS ECUs.
Does the MC33FS8520A0KSR2 support multiphase operation between BUCK1 and BUCK2?
Yes, the MC33FS8520A0KSR2 supports multiphase operation between BUCK1 and BUCK2 to extend peak current capability to 7.2 A on a single rail. Phase shifting is programmable via OTP configuration, and thermal shutdown (TSD) triggers coordinated shutdown of both regulators plus deep fail-safe (DFS) activation.
How is the VPRE controller configured in the MC33FS8520A0KSR2?
The MC33FS8520A0KSR2 includes a fully featured VPRE synchronous buck controller with high-side (PRE_GHS) and low-side (PRE_GLS) gate drivers, bootstrap (PRE_BOOT), positive current sense (PRE_CSP), and feedback (PRE_FB) pins. It supports external MOSFETs for up to 10 A peak output and is configured via OTP for fixed 3.3 V output in the A0 variant.
Can the MC33FS8520A0KSR2 be used with both SPI and I²C interfaces?
Yes, the MC33FS8520A0KSR2 supports both SPI and I²C communication protocols. The I²C address is fixed at 0x20, and SPI uses standard four-wire mode (CSB, SCLK, MOSI, MISO). Both interfaces implement CRC error checking and provide full register-level access to configuration, status, and fault registers.
What is the purpose of the PSYNC pin on the MC33FS8520A0KSR2?
The PSYNC pin on the MC33FS8520A0KSR2 serves as a bidirectional power synchronization interface. It can be configured as input to lock switching frequency to an external clock source, or as output to drive a second FS85 device or external PMIC - enabling deterministic phase alignment and reduced system-level EMI in multi-rail automotive architectures.
MC33FS8520A0KSR2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 56-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- System Basis Chip
- Current - Supply:
- 15mA
- Voltage - Supply:
- 60V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 56-HVQFN (8x8)
MC33FS8520A0KSR2 FAQ
1.How can I place an order for MC33FS8520A0KSR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC33FS8520A0KSR2 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 MC33FS8520A0KSR2 reliable?
The price and inventory of MC33FS8520A0KSR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33FS8520A0KSR2 is usually 5 days.
3.What payment methods are accepted for MC33FS8520A0KSR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33FS8520A0KSR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC33FS8520A0KSR2?
MC33FS8520A0KSR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC33FS8520A0KSR2 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 MC33FS8520A0KSR2?
For technical support, including MC33FS8520A0KSR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33FS8520A0KSR2 requirements.
6.How does Aetrix verify that MC33FS8520A0KSR2 is sourced from the original manufacturer or authorized distributors?
All MC33FS8520A0KSR2 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 MC33FS8520A0KSR2 meets industry standards.
7.What is the process for return or replacement of MC33FS8520A0KSR2?
All MC33FS8520A0KSR2 units undergo pre-shipment inspection (PSI). If there is an issue with MC33FS8520A0KSR2, 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 MC33FS8520A0KSR2 part is unused and in its original packaging.
Return procedure for MC33FS8520A0KSR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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