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NXP Semiconductors MC33FS8520A0KS
- Part No.:
- MC33FS8520A0KS
- Manufacturer:
- NXP Semiconductors
- Category:
- Power Management - Specialized
- Package:
- 56-VFQFN Exposed Pad
- Datasheet:
-
MC33FS8520A0KS.pdf
- Description:
- SAFETY POWER MANAGEMENT IC, QFN5
- Quantity:
- Payment:
- Shipping:
Inventory:1,700
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Product details
Overview
MC33FS8520A0KS 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), a 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 synchronization (PSYNC). It targets radar and ADAS domain controllers requiring functional safety and multi-rail power sequencing.
For engineers reviewing the MC33FS8520A0KS datasheet, MC33FS8520A0KS pinout, MC33FS8520A0KS application, or MC33FS8520A0KS equivalent, this page provides verified technical context, safety-critical specifications, package mapping to HVQFN56, and validated alternatives for ASIL D automotive power management design.
Technical Context
The MC33FS8520A0KS implements a dual-BUCK architecture (BUCK1 + BUCK2) with multi-phase capability enabling up to 7.2 A peak on a single rail, configurable switching frequency at 2.22 MHz, and soft-start slope of 7.81 mV/µs. Its fail-safe state machine includes challenger watchdog, ABIST/LBIST, FCCU monitoring inputs, and deep fail-safe autoretry (infinite cycles).
It integrates voltage supervision across six analog inputs (VCOREMON, VDDIOMON, VMON1–VMON4), programmable over/under-voltage thresholds with delay filtering (OV_DGLT = 25–45 µs), and PGOOD/RSTB outputs with mandatory VDDIO pull-up. The device uses OTP-programmed configurations for regulator start/stop slots, phase shifting, and TSD behavior per rail.
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 |
| BUCK1 Output | 1.1 V @ 4.5 A peak; dedicated MCU core supply with SVS capability |
| BUCK2 Output | 1.8 V @ 4.5 A peak; enables multi-phase operation with BUCK1 |
| Switching Frequency | 2.22 MHz fixed; enables compact magnetics and reduced EMI |
| LDO Outputs | Two 400 mA LDOs: LDO1 (1.8 V) and LDO2 (3.3 V) for MCU I/O and ADC supply |
| Fail-Safe Output | FS0B open-drain active-low output; integral to safety partitioning and fault response |
| Interface | SPI or I²C (0x20 address); includes CRC for command integrity |
Pinout & Package
HVQFN56 package: plastic thermal-enhanced very thin quad flat no-lead, 8 mm × 8 mm × 0.85 mm body, 0.5 mm pitch, wettable flank (dimple type for KS suffix), exposed pad (EP) connected to GNDFS/GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BUCK1_FB | Voltage feedback input | Connects to BUCK1 output divider; sets regulated 1.1 V output |
| BUCK2_FB | Voltage feedback input | Connects to BUCK2 output divider; sets regulated 1.8 V output |
| FS0B | Fail-safe output | Active-low open-drain signal indicating safety state; requires external pull-up |
| PSYNC | Power sync I/O | Enables synchronized operation of two MC33FS8520A0KS or with external PMIC |
| VCOREMON | Core voltage monitor input | Mandatory connection to BUCK1 output for ASIL D-compliant core supervision |
| RSTB | Reset output | Active-low reset signal for MCU; monitors external reset and fault conditions |
| PGOOD | Power-good output | Active-low status flag; indicates all enabled rails are within regulation tolerance |
| INTB | Interrupt output | Open-drain interrupt signaling faults, sequencing completion, or safety events |
Key Features
| Feature | Design Value |
|---|---|
| Multi-phase BUCK1+BUCK2 | Extends current capability to 7.2 A peak on one rail for high-power MCU cores |
| EMC optimization | Includes SMPS frequency synchronization, spread spectrum, and slew rate control |
| OTP-configurable sequencing | Assigns each regulator to specific power-up/down slot (e.g., BUCK1 in Slot 6) |
| Deep fail-safe autoretry | Infinite retry cycles on critical faults before entering permanent fail-safe state |
| Integrated safety monitoring | Dedicated FCCU1/FCCU2 inputs, ERRMON, ABIST, LBIST, and watchdog with challenger mode |
| Low quiescent current | 10 µA typical in OFF mode for battery-sensitive always-on applications |
Applications
| Radar Sensor Power Management | ADAS Domain Controller Supply |
|---|---|
Use Scenario: Powers NXP S32R274/S32R294 radar SoCs with precise voltage rails and timing-critical sequencing. IC Role / Device Role / Timing Role: Primary SBC providing VPRE (5.0 V), BUCK1 (1.1 V), BUCK2 (1.8 V), LDO1 (1.8 V), and LDO2 (3.3 V) with ASIL D safety monitoring. Use Value: Enables deterministic startup within 250 µs TSlot, meets radar EMI requirements via FSYNC, and ensures fail-safe shutdown on VCOREMON undervoltage. | Use Scenario: Supplies multi-core domain controllers (e.g., S32Z/S32E) requiring independent, sequenced, and monitored power domains. IC Role / Device Role / Timing Role: Centralized power manager delivering six regulated outputs with configurable start/stop slots and integrated voltage supervision. Use Value: Reduces BOM count by consolidating SMPS + LDO + safety logic; supports FCCU-based MCU health checks and deep fail-safe recovery. |
| Vision System Power Architecture | Infotainment Head Unit Power |
Use Scenario: Powers S32V-based camera modules with low-noise LDOs for image sensor analog supply and high-efficiency BUCKs for SoC cores. IC Role / Device Role / Timing Role: Dual-role SBC supplying BUCK1 (1.1 V) for vision processor core, BUCK2 (1.8 V) for memory interface, and LDO2 (3.3 V) for ADC reference. Use Value: Achieves <10 mVpp ripple on LDO2 via dedicated 400 mA output; soft-start slope (7.81 mV/µs) prevents inrush-induced camera reset. | Use Scenario: Delivers stable, safe power to infotainment SoCs (e.g., i.MX8) with display, audio, and connectivity subsystems. IC Role / Device Role / Timing Role: Functional safety gateway SBC providing VPRE (5.0 V), BUCK1 (1.1 V), BUCK2 (1.8 V), and dual LDOs with PGOOD coordination. Use Value: Supports hot-plug detection via WAKE1/WAKE2 pins; PSYNC synchronizes with companion PMIC for system-wide EMC compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fail-safe SBC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC33FS8530A0KS | Includes BUCK3 (1.2 V @ 2.6 A) and enhanced VMON3/VMON4 supervision; same ASIL D, HVQFN56, and pinout | Required for three-rail systems (e.g., radar + PHY + MCU); adds third independent low-voltage domain | Select when BUCK3 is needed for auxiliary logic or PHY supply; otherwise MC33FS8520A0KS reduces cost and layout complexity |
| MC33FS8420G0KS | ASIL B rated; identical BUCK1/BUCK2 topology and 2.22 MHz frequency but lacks FCCU, ABIST, and deep fail-safe autoretry | Suitable for non-safety-critical clusters or gateway ECUs where ASIL D is not mandated | Choose for cost-sensitive ASIL B designs; not acceptable for radar or domain controller ASIL D decomposition |
Compared with MC33FS8520A0KS, MC33FS8530A0KS adds a third BUCK rail and expanded monitoring for higher-complexity systems, while MC33FS8420G0KS offers a lower-safety-tier option with identical power architecture but reduced diagnostic coverage-making MC33FS8520A0KS the optimal balance of ASIL D compliance, dual-BUCK performance, and BOM efficiency.
Availability
MC33FS8520A0KS is available at Aetrix Electronics and suitable for radar sensor modules, ADAS domain controllers, and vision systems requiring stable component supply, long-term automotive qualification, and ASIL D functional safety assurance.
Supply support for MC33FS8520A0KS 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, with leadership in functional safety and automotive processing.
The FS85 family-including MC33FS8520A0KS-is designed specifically for ASIL D automotive power management in radar, vision, and domain controller systems, integrating safety mechanisms, multi-rail regulation, and system-level synchronization.
FAQ
What safety certifications apply to the MC33FS8520A0KS?
The MC33FS8520A0KS is developed in full compliance with ISO 26262 for ASIL D applications and qualified per AEC-Q100 Grade 1 (−40 °C to +125 °C ambient). It includes integrated ABIST, LBIST, challenger watchdog, FCCU monitoring inputs, and fail-safe output (FS0B) to meet automotive safety goals. All safety mechanisms are documented in the FS84_FS85C product data sheet Rev. 12.0.
Does the MC33FS8520A0KS support multi-phase operation between BUCK1 and BUCK2?
Yes, the MC33FS8520A0KS supports multi-phase operation between BUCK1 and BUCK2 to extend current capability up to 7.2 A peak on a single rail. This is enabled via configurable phase-shifting delays (e.g., BUCK1 delay 0, BUCK2 delay 2) and shared power sequencing slot assignment, allowing interleaved switching for reduced input/output ripple and thermal stress.
What is the function of the PSYNC pin on the MC33FS8520A0KS?
The PSYNC pin on the MC33FS8520A0KS serves as a bidirectional power synchronization interface. It allows two MC33FS8520A0KS devices-or one MC33FS8520A0KS and an external PMIC-to synchronize switching frequencies, reducing beat frequencies and improving system-level EMC performance. Its operation is configurable via OTP and requires no external clock source.
How is the fail-safe output (FS0B) used in a radar application with the MC33FS8520A0KS?
In radar applications, the FS0B output of the MC33FS8520A0KS drives an external safety relay or MCU safety input to force controlled shutdown upon detection of critical faults (e.g., VCOREMON undervoltage, TSD, or FCCU timeout). As an active-low open-drain signal, it requires a VDDIO pull-up and directly participates in the vehicle's fail-safe partitioning strategy per ISO 26262.
Can the MC33FS8520A0KS be configured for different power-up sequences?
Yes, the MC33FS8520A0KS supports fully configurable power-up and power-down sequencing via OTP programming. Each regulator (BUCK1, BUCK2, LDO1, LDO2) is assigned to a specific slot (e.g., BUCK1 in Slot 6, BUCK2 in Slot 0), with defined start/stop timing and interdependencies. This enables precise alignment with SoC requirements such as S32R294 boot order and voltage ramp constraints.
MC33FS8520A0KS 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 56-HVQFN (8x8)
MC33FS8520A0KS FAQ
1.How can I place an order for MC33FS8520A0KS through Aetrix?
Please submit a Request for Quotation (RFQ) for MC33FS8520A0KS 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 MC33FS8520A0KS reliable?
The price and inventory of MC33FS8520A0KS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33FS8520A0KS is usually 5 days.
3.What payment methods are accepted for MC33FS8520A0KS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33FS8520A0KS transactions.
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4.How is shipping managed for MC33FS8520A0KS?
MC33FS8520A0KS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC33FS8520A0KS 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 MC33FS8520A0KS?
For technical support, including MC33FS8520A0KS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33FS8520A0KS requirements.
6.How does Aetrix verify that MC33FS8520A0KS is sourced from the original manufacturer or authorized distributors?
All MC33FS8520A0KS 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 MC33FS8520A0KS meets industry standards.
7.What is the process for return or replacement of MC33FS8520A0KS?
All MC33FS8520A0KS units undergo pre-shipment inspection (PSI). If there is an issue with MC33FS8520A0KS, 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 MC33FS8520A0KS part is unused and in its original packaging.
Return procedure for MC33FS8520A0KS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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