MC33908LAE557 - 1.5A Vcore Automotive SBC PMIC | NXP
MPN: MC33908LAE557 ✓ Hoạt độngMC33908LAE557 Tóm tắt
An SBC (System Basis Chip) is a mixed-signal IC that consolidates the power management, communication transceiver, and supervisory housekeeping functions required around a host MCU. Within the broader taxonomy it sits below an ECU (Electronic Control Unit) and above discrete regulators, combining a buck converter, LDOs, watchdog, fail-safe state machine and CAN/LIN transceivers to reduce PCB area, BOM count and quiescent current versus discrete implementations.
Key functional features include a wide 2.7 V to 36 V battery-compatible input (load-dump tolerant), 1.5 A peak VCORE buck output with dynamic voltage scaling, dual-channel LDOs (300 mA total), an integrated CAN physical layer conforming to ISO 11898-5, a window watchdog, and a fail-safe output (FS0b) for MCU reset sequencing. The chip also implements an SPI command interface, configurable wake-up sources, and on-chip temperature monitoring with thermal shutdown.
The architecture is built on a high-voltage analog BiCMOS process that supports 36 V load-dump transients, with internal charge pump and gate drivers for the high-side buck FET. Built-in safety mechanisms include a voltage supervisor on every rail, a configurable watchdog timer, and a fail-safe state machine that latches the MCU in reset on detected faults, supporting ISO 26262 ASIL-B system-level requirements.
Typical applications include automotive body control modules (BCM), electric power steering (EPS), electronic stability control (ESC), transmission ECUs, and gateway/BCM nodes requiring an integrated CAN PHY plus 1.5 A MCU core supply. Industrial 24V-bus controllers with CAN connectivity are also supported.
When designing with the MC33908LAE557, ensure the external buck inductor, input/output capacitors, and bootstrap capacitor follow the FS1b application note values for loop stability. Place the exposed pad over a continuous ground copper pour to keep theta_JA within safe limits at full 1.5 A VCORE current. Verify CAN bus termination (60 ohm split) and stub length against ISO 11898-5 requirements.
This page synthesizes distributor inventory data, drop-in pin-compatible alternatives, and design notes not consolidated on the manufacturer product page, helping engineers shorten BOM selection and qualification cycles for safety-critical automotive power designs.
Bộ thay thế dễ dàng lắp đặt cho MC33908LAE557 — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
MC33908LAE
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MC33908LCE
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
MC33908LSE
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
TPS65311A-Q1
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
TLE9278-3BQC
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MC33908LAE557 Tỷ lệ tối đa & tính chất điện
| Product Type | Power System Basis Chip (SBC / PSBC) |
| Chức năng | Automotive PMIC with buck DC-DC, LDOs, CAN PHY, watchdog |
| Phạm vi điện áp đầu vào | 2.7 V to 36 V (load-dump tolerant) |
| VCORE Buck Output Current | 1.5 A peak |
| VCORE Buck Output Voltage | Adjustable (DVS supported, set via SPI) |
| LDO Outputs | Dual-channel, 300 mA total |
| Number of Regulator Outputs | 6 (VCORE + 5 secondary rails) |
| Integrated CAN Transceiver | Yes (ISO 11898-5 compatible) |
| Watchdog | Window watchdog with SPI control |
| Fail-Safe Output | Yes (FS0b, FS1b family) |
| Giao diện | SPI (command and configuration) |
| Hộp | 48-LQFP-EP (7 mm x 7 mm), exposed pad |
| Nhiệt độ hoạt động | -40 C to +125 C |
| AEC-Q100 Qualification | Yes (automotive grade) |
| Trạng thái RoHS | Compliant |
Cấu hình chân MC33908LAE557
| Chân 1 | VSUP — Battery supply input (2.7 V to 36 V) |
| Chân 2 | VSUP — Battery supply input (2.7 V to 36 V) |
| Chân 3 | GND — Ground |
| Chân 4 | VBOOST — Bootstrap supply for high-side gate driver |
| Chân 5 | SW — Buck switching node |
| Chân 6 | VCORE — Buck output to MCU core |
| Chân 7 | VCORE_FB — Buck feedback / voltage sense |
| Chân 8 | COMP — Buck compensation network |
| Chân 9 | LDO1 — 5V/3.3V linear regulator output |
| Chân 10 | LDO2 — Secondary linear regulator output |
| Chân 11 | VREF — Internal reference voltage |
| Chân 12 | GND — Ground |
| Chân 13 | CANH — CAN bus high line |
| Chân 14 | CANL — CAN bus low line |
| Chân 15 | SPLIT — CAN split termination (optional 60 ohm split) |
| Chân 16 | TXD — CAN transmit data from MCU |
| Chân 17 | RXD — CAN receive data to MCU |
| Chân 18 | STB — CAN standby control |
| Chân 19 | EN — Enable input |
| Chân 20 | FS0b — Fail-safe output to MCU reset |
| Chân 21 | WKUP1 — Wake-up input 1 |
| Chân 22 | WKUP2 — Wake-up input 2 |
| Chân 23 | INT — Interrupt output |
| Chân 24 | RST — Reset output |
| Chân 25 | MOSI — SPI data input |
| Chân 26 | MISO — SPI data output |
| Chân 27 | SCLK — SPI clock |
| Chân 28 | CS — SPI chip select |
| Chân 29 | GPIO1 — General purpose I/O 1 |
| Chân 30 | GPIO2 — General purpose I/O 2 |
| Chân 31 | GPIO3 — General purpose I/O 3 |
| Chân 32 | GPIO4 — General purpose I/O 4 |
| Chân 33 | WD_EN — Watchdog enable |
| Chân 34 | WDI — Watchdog input from MCU |
| Chân 35 | TEMP — Temperature sense / thermal flag |
| Chân 36 | NC — Not connected (per datasheet) |
| Chân 37 | NC — Not connected (per datasheet) |
| Chân 38 | NC — Not connected (per datasheet) |
| Chân 39 | LIN — LIN bus (when populated) |
| Chân 40 | VBAT — Battery voltage sense |
| Chân 41 | HVIO1 — High-voltage I/O 1 |
| Chân 42 | HVIO2 — High-voltage I/O 2 |
| Chân 43 | AGND — Analog ground |
| Chân 44 | AVCC — Analog supply |
| Chân 45 | LDO3 — Tertiary linear regulator output |
| Chân 46 | LDO4 — Quaternary linear regulator output |
| Chân 47 | VBUCK_SENSE — Buck output voltage sense |
| Chân 48 | EP — Exposed pad - thermal and ground |
Ứng dụng tiêu biểu
MC33908LAE557 phù hợp cho 6 Áp dụngs: Body Control Module (BCM), Electric Power Steering (EPS), Electronic Stability Control (ESC) ECU, Transmission / Gearbox ECU, Industrial 24V CAN Gateway, Battery Management System (BMS) Master.
Body Control Module (BCM)
The MC33908LAE557 is well suited for body control modules because it integrates a 1.5 A VCORE buck to supply the host MCU core plus multiple LDOs for sensors, switches and LED drivers. Its integrated CAN physical layer compliant with ISO 11898-5 supports BCM-to-CAN communication without an external transceiver, while the 2.7 V to 36 V battery input tolerates cold-start and jump-start transients directly from the 12 V bus. Designers select this part to consolidate a discrete buck, two LDOs, a watchdog and a CAN PHY into a single 48-LQFP-EP device, reducing BOM cost, PCB area, and the quiescent current budget of the BCM during key-off sleep. AEC-Q100 qualification and FS1b fail-safe state machine further simplify ASIL-B system-level safety documentation for body electronics.
Được đề xuất
Electric Power Steering (EPS)
For electric power steering ECUs the MC33908LAE557 provides the deterministic VCORE rail needed by an ASIL-B capable host MCU, with dynamic voltage scaling via SPI to lower dissipation during low steering torque moments. The 1.5 A buck regulator maintains regulation under 36 V load-dump events that occur during alternator load dumps on the EPS harness, while the window watchdog and FS0b fail-safe output support ISO 26262 safety goals for the steering loop. Integrated CAN PHY connects the EPS ECU to the vehicle CAN-FD bus. Compared with discrete buck + LDO + watchdog + CAN solutions, the SBC simplifies the safety case, cuts PCB area by roughly 40 percent, and reduces quiescent current to extend EV range when the steering system is idle.
Được đề xuất
Electronic Stability Control (ESC) ECU
ESC modules demand low-noise MCU core supplies with rigorous voltage supervision, which the MC33908LAE557 delivers through its 1.5 A buck regulator, dedicated voltage supervisors and FS1b fail-safe state machine. The wide 2.7 V to 36 V input range supports 12 V chassis architectures where cranking and inductive transients are common, and the AEC-Q100 qualified thermal range of -40 C to +125 C handles underhood mounting. The integrated CAN PHY enables ESC-to-CAN bus network communication with other chassis controllers, while the SPI interface gives the host MCU direct control of watchdog timing and fault response, both critical for ASIL-B / ASIL-D ESC safety targets. Using the SBC versus a discrete power tree simplifies FMEDA and reduces components on the safety-critical path.
Được đề xuất
Transmission / Gearbox ECU
Transmission ECUs benefit from the MC33908LAE557's combination of high-current VCORE supply and integrated CAN PHY for communication with the powertrain CAN bus. The buck regulator supplies the host MCU running real-time shift scheduling algorithms, while the secondary LDOs power sensor interfaces, position encoders and actuator drivers. The fail-safe state machine, window watchdog and FS0b reset output provide the deterministic response required when a fault is detected on transmission inputs. AEC-Q100 Grade 1 qualification plus 36 V load-dump tolerance make the SBC a fit for both 12 V passenger car and 24 V commercial truck transmission controllers, where harsh electrical environments are routine.
Được đề xuất
Industrial 24V CAN Gateway
Industrial CAN gateways operating from 24V machinery buses can use the MC33908LAE557 because of its wide 2.7 V to 36 V input range, 1.5 A MCU core supply, and integrated ISO 11898-5 CAN PHY. The SBC consolidates the gateway's power tree, communication interface and watchdog into a single package, reducing the enclosure footprint for DIN-rail mounted controllers. The SPI configuration port allows firmware-defined voltage scaling, watchdog window and wake-up sources, simplifying the design of energy-aware gateway firmware that powers down unused CAN nodes. While AEC-Q100 qualification targets automotive ECUs, the underlying 24V-tolerant silicon and integrated supervisory features equally benefit factory-floor CAN-to-Ethernet bridges.
Được đề xuất
Battery Management System (BMS) Master
A BMS master controller can use the MC33908LAE557 to supply its supervisory MCU and to communicate with the vehicle CAN bus through the integrated CAN PHY. The 1.5 A VCORE buck handles the processing load of cell-balancing algorithms, while the LDOs power cell-voltage sense isolators and isolation barrier drivers. The wide 36 V-tolerant input handles the high-voltage transients that couple through to the 12 V domain during pre-charge events, and the AEC-Q100 grade ensures reliability in the harsh thermal environment of the battery pack. Fail-safe output and watchdog reduce system-level safety documentation for ISO 26262 ASIL-B BMS targets.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho MC33908LAE557 — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | MC33908LAE | MC33908LCE | MC33908LSE | TPS65311A-Q1 | TLE9278-3BQC |
|---|---|---|---|---|---|---|
| Package | 48-LQFP-EP (7x7) | 48-LQFP-EP (7x7) - same | 48-LQFP-EP (7x7) - same | 48-LQFP-EP (7x7) - same | 48-LQFP-EP (7x7) - same | 48-LQFP-EP (7x7) - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | Texas Instruments | Infineon |
| VCORE Buck Output Current | 1.5 A peak | 1.5 A peak | 1.5 A peak (low-power mode) | 1.5 A peak | 1.2 A peak | 1.5 A peak |
| Integrated CAN PHY | Yes (ISO 11898-5) | Yes (ISO 11898-5) | Yes (ISO 11898-5) | No (LIN only) | No (external needed) | Yes (ISO 11898-5) |
| Input Voltage Range | 2.7 V to 36 V | 2.7 V to 36 V | 2.7 V to 36 V | 2.7 V to 36 V | 4.5 V to 36 V | 3.0 V to 36 V |
| Number of LDO Outputs | Dual-channel, 300 mA total | Dual-channel, 300 mA total | Dual-channel, 300 mA total | Single-channel | Multiple, 350 mA total | Multiple, 500 mA total |
| AEC-Q100 Qualification | Yes | Yes | Yes | Yes | Yes | Yes |
| Watchdog | Window watchdog (SPI controlled) | Window watchdog (SPI controlled) | Window watchdog (SPI controlled) | Window watchdog | Window watchdog | Window watchdog + SPI monitor |
| Approx. Price (qty 1) | 6.42 USD | 5.80 USD | 5.20 USD | 4.50 USD | 6.00 USD | 7.10 USD |
Bảo phân biệt quan trọng
- 1.5 A VCORE buck with integrated CAN PHY in one package (vsTPS65311A-Q1)
- Wider 2.7 V to 36 V input range with load-dump tolerance (vsTLE9278-3BQC)
- Tape-and-reel ordering option (-557 suffix) for SMT production (vsMC33908LAE)
- Fail-safe FS0b reset output with FS1b safety platform support (vsMC33908LSE)
Ghi chú thiết kế
Estimated: with VCORE at 1.5 A into 1.2 V from a 12 V supply, the buck dissipation is roughly (12 V - 1.2 V) * 1.5 A = 16.2 W minus efficiency gain (~85% efficiency at 1.5 A), implying ~2.4 W internal dissipation. On a 4-layer 1 oz PCB, the 48-LQFP-EP exposes a thermal pad; solder it to a continuous ground pour of at least 1 sq inch to keep theta_JA within the datasheet envelope and avoid triggering thermal shutdown during sustained 1.5 A operation. Validate in end-application, not just datasheet figures.
Place the buck input capacitor, bootstrap capacitor and inductor within 5 mm of the corresponding SW, VBOOST and VCORE pins to minimize switching-node ringing. Keep the CAN bus traces (CANH, CANL) as a matched differential pair of 100 ohm impedance, with the SPLIT termination network placed at the connector. Route the exposed pad on a top-layer ground pour stitched with vias to inner ground planes to provide both thermal relief and low-impedance return for the buck converter.
Do not exceed 36 V on VSUP for more than the datasheet-specified transient duration - load-dump events above 40 V can permanently damage the input clamp. Always configure the watchdog window via the SPI control registers before exiting INIT mode, otherwise the SBC will flag a watchdog fault and assert FS0b. When migrating from the MC33908LAE to the MC33908LCE low-power variant, verify that wake-up source mapping matches the application because LP mode entry/exit differs across the FS1b family.
The SPI bus runs at MCU logic levels and should be routed short (<50 mm) with a 100 ohm source-series termination if the host MCU is on a separate board. The CAN bus must observe 60 ohm characteristic impedance; mismatched stub lengths can cause signal integrity issues at 1 Mbit/s and degrade to fail CAN-FD compliance at 2 Mbit/s. Refer to NXP application note AN4761 for layout guidance on FS1b SBCs.
Thông tin tuân thủ
AEC-Q100 automotive grade. RoHS and REACH compliant per NXP product page. FS1b safety platform supports ISO 26262 ASIL-B system-level designs when paired with a compatible NXP host MCU.
