NXP Semiconductors MC34FS6408NAER2

Overview

MC34FS6408NAER2 from NXP Semiconductors is a power system basis chip integrating a high-speed CAN transceiver, dual SMPS pre-regulator (buck-boost or buck), 1.5 A VCORE switching regulator, 5.0 V/3.3 V VCCA linear regulator, and six configurable I/Os - all in a single 48-pin LQFP-EP package. It delivers fail-safe power management for industrial control units requiring robust wake-up (CAN or I/O), low-power mode (32 µA), and ISO11898-2/-5 CAN compliance.

For engineers reviewing the MC34FS6408NAER2 datasheet, MC34FS6408NAER2 pinout, MC34FS6408NAER2 application, or MC34FS6408NAER2 equivalent, this device supports safety-critical embedded systems where simultaneous regulation of core, auxiliary, sensor, and CAN bus supplies must meet stringent thermal, undervoltage, and fault-detection requirements across -40 °C to 125 °C ambient.

Technical Context

The MC34FS6408NAER2 implements a hierarchical power architecture: a VPRE pre-regulator (6.25 V ±0.25 V output) feeds a VCORE SMPS (adjustable 1.2–3.3 V, 1.5 A max), while independent linear regulators supply VCCA (5.0 V/3.3 V, up to 300 mA with external PNP), VAUX (5.0 V/3.3 V, 300 mA), and CAN-5V (5.0 V, 100 mA). All regulators feature integrated overcurrent, thermal warning (105 °C), and shutdown (160 °C) protection with hysteresis.

Its embedded HSCAN transceiver complies fully with ISO11898-2 and ISO11898-5, supporting dominant/recessive differential output voltages (VCANH/VCANL ≥1.5 V swing), sleep-mode wake-up, and bus fault tolerance (±27 V common-mode range). Safety logic includes FS0B fail-safe output, RSTB MCU reset assertion, and SPI-configurable I/O monitoring for redundant error detection.

Key Specifications

Pinout & Package

MC34FS6408NAER2 is housed in a 48-pin LQFP with exposed pad (JEDEC MO-220, package code AE), optimized for thermal dissipation (RθJCBOTTOM = 0.9 °C/W) in industrial motor control and PLC applications.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar power system basis chip applications.

Compared with MC34FS6407NAER2, the MC34FS6408NAER2 enables higher-core-current applications without changing PCB layout, while TC358749XBG reduces integration depth - requiring external regulators and safety circuitry to match MC34FS6408NAER2's functional safety and multi-rail capabilities.

Availability

MC34FS6408NAER2 is available at Aetrix Electronics and suitable for industrial PLCs, mobile machinery controllers, medical infusion pumps, and military vehicle subsystems requiring stable component supply, long-term lifecycle support, and AEC-Q100–aligned reliability.

Supply support for MC34FS6408NAER2 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 leader specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with broad expertise in power management and CAN interface technology.

The MC34FS6408NAER2 belongs to NXP's SMARTMOS power system basis chip family, designed specifically for safety-critical industrial and transportation systems requiring integrated high-speed CAN, multi-rail regulation, and fail-safe supervision in a single package.

FAQ

What is the maximum output current capability of the VCORE regulator in MC34FS6408NAER2?

The VCORE regulator in MC34FS6408NAER2 delivers up to 1.5 A continuous output current in normal mode, with current limiting set at 1.8–3.5 A depending on operating conditions. This is confirmed in Table 4 of the FS6407/FS6408 datasheet (Rev. 3.0, p.11), where ICORE for FS6408N is specified as 1.5 A and ICORE_LIM as 1.8 A (min) to 3.5 A (max). The MC34FS6408NAER2 maintains this rating across its full -40 °C to 125 °C ambient temperature range.

Does MC34FS6408NAER2 support both buck and boost configurations for its pre-regulator?

Yes, MC34FS6408NAER2 supports both buck and non-inverting buck-boost topologies for its VPRE pre-regulator, as explicitly stated in the "Features" section (p.2) and Figure 1 (buck-boost) and Figure 2 (buck) of the datasheet. The topology is selected by external component placement - no internal configuration is required. Input voltage range extends down to 2.7 V in boost mode and 4.6 V in buck mode, enabling flexible design for varying battery or supply conditions.

How does the fail-safe machine in MC34FS6408NAER2 respond to a VCORE undervoltage condition?

When VCORE falls below the FB_CORE undervoltage threshold (0.67–0.773 V), the fail-safe machine in MC34FS6408NAER2 asserts the FS0B pin low and drives RSTB low to reset the connected MCU. This response is immediate and hardware-based, independent of SPI communication. The hysteresis (10–27 mV) prevents chatter during marginal conditions, and degraded-mode detection (0.45–0.58 V) provides additional fault grading before full shutdown.

What are the voltage options and current limits for the VCCA regulator in MC34FS6408NAER2?

The VCCA regulator in MC34FS6408NAER2 is configurable for either 5.0 V or 3.3 V output using the SELECT pin. In 5.0 V mode, it delivers up to 100 mA internally or 300 mA with an external PNP transistor; in 3.3 V mode, output is 3.3 V ±1.5% at up to 300 mA with external ballast. Current limiting is foldback-type, activating at 80–200 mA with voltage threshold 0.5–1.1 V, as detailed in Table 4 (p.12).

Can MC34FS6408NAER2 operate with input supply voltages below 5 V?

Yes, MC34FS6408NAER2 supports input voltages as low as 2.7 V in boost configuration, verified by the VSUP_UV_L parameter (2.7 V) in Table 4 (p.10). Below 4.6 V, the pre-regulator operates in boost mode to maintain VPRE at 6.25 V; above 4.6 V, it switches to buck mode. This capability enables reliable startup and operation from partially discharged 12 V batteries or low-voltage industrial supplies without external boost circuitry.