NXP Semiconductors MFS5600AMMA8ESR2

Overview

MFS5600AMMA8ESR2 from NXP Semiconductors is a QM-grade automotive dual-buck power management IC integrating a 3.3 V/450 kHz internal-FET buck regulator (SW1) and a 5.0 V/450 kHz external-FET buck controller (SW2), with ±2 % output accuracy, AEC-Q100 Grade-1 qualification, and operation from –40 °C to 150 °C junction temperature - deployed in infotainment and ADAS domain controllers.

For engineers reviewing the MFS5600AMMA8ESR2 datasheet, MFS5600AMMA8ESR2 pinout, MFS5600AMMA8ESR2 application, or MFS5600AMMA8ESR2 equivalent, key selection criteria include OTP-programmed fixed-output configuration, QM safety grade (no watchdog or voltage monitors), 32-pin 5 mm × 5 mm WF-QFN package, and dual-regulator sequencing support via EN1/EN2.

Technical Context

The MFS5600AMMA8ESR2 implements two independent buck topologies: SW1 uses peak-current-mode control with integrated high- and low-side MOSFETs (R_DS(on) = 105 mΩ / 46 mΩ), while SW2 employs external FETs driven by dedicated gate outputs (SW2GHS/SW2GLS) and current-sense inputs (SW2CSP/SW2CSN). Both regulators operate at a fixed 450 kHz switching frequency per OTP configuration.

It features I²C interface (SCL/SDA) for register access and OTP programming, GPIO1/VDDOTP for development supply, and dual enable inputs (EN1/EN2) supporting independent soft-start control. The QM variant excludes windowed watchdog, ERRMON/FCCU monitoring, FS0B, and VMON1–VMON4 - confirmed by Table 1 and Figure 5 pinout.

Key Specifications

Pinout & Package

Package: 32-pin 5 mm × 5 mm WF-QFN (SOT617-24(SC)) with exposed thermal pad (EPAD) requiring ground connection via ≥4 thermal vias.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-buck regulator applications.

Compared with MFS5600AMMA8ESR2, MFS5600AMBAFES and MFS5600AMBAYES deliver identical 3.3 V/5.0 V outputs but embed functional safety infrastructure (watchdog, monitoring, fail-safe signaling), increasing design complexity and validation scope while enabling ASIL B compliance - making them unsuitable as drop-in replacements without safety architecture review.

Availability

MFS5600AMMA8ESR2 is available at Aetrix Electronics and suitable for infotainment, telematics, and driver monitoring systems requiring stable component supply, automotive qualification, and QM-grade power management without safety overhead.

Supply support for MFS5600AMMA8ESR2 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 markets, with deep expertise in automotive power management and functional safety.

The FS5600 product line delivers integrated dual-buck PMICs designed specifically for automotive domain controllers, balancing high integration, thermal robustness, and scalable safety grades (QM/ASIL B/Enhanced ASIL B) across vehicle E/E architectures.

FAQ

What output voltages does the MFS5600AMMA8ESR2 provide?

The MFS5600AMMA8ESR2 provides fixed 3.3 V from its integrated-FET buck regulator (SW1) and fixed 5.0 V from its external-FET buck controller (SW2), both programmed at factory via OTP. These values are immutable in the field and do not require external resistor dividers - confirmed in Table 2 and Section 11.3.1 of the datasheet. The MFS5600AMMA8ESR2 is optimized for systems needing precisely these two rails without configuration overhead.

Is the MFS5600AMMA8ESR2 pin-compatible with other FS5600 variants?

Yes, the MFS5600AMMA8ESR2 shares the identical 32-pin WF-QFN package (SOT617-24(SC)) and pinout with all QM-grade FS5600 variants, including MFS5600AMMA0ES and MFS5600AMMA7ES. Pin functions match Figure 5 in the datasheet - notably VMON1/VMON2/FS0B are NC and tied to ground, while GPIO2/GPIO3 serve as GPO2/GPO3. This allows mechanical compatibility across QM SKUs.

Does the MFS5600AMMA8ESR2 include functional safety features like watchdog or voltage monitors?

No, the MFS5600AMMA8ESR2 is a QM-grade device and explicitly excludes all functional safety features: no windowed watchdog timer, no ERRMON or FCCU monitoring, no FS0B output, and no VMON1–VMON4 inputs (Table 1, Figure 5). These pins are either no-connect or repurposed as GPIOs. Safety-critical designs must select ASIL B variants like MFS5600AMBAFES instead of the MFS5600AMMA8ESR2.

What is the recommended input capacitor for the MFS5600AMMA8ESR2 SW1 regulator?

The datasheet specifies ≥10 µF total ceramic capacitance (X5R/X7R) across SW1IN pins (18 and 19) for switching frequencies <1 MHz - matching the MFS5600AMMA8ESR2's fixed 450 kHz operation. This value ensures stable input impedance during load transients and prevents VIN droop that could trigger undervoltage lockout. The capacitor must be placed close to the pins with low-inductance routing to maintain stability of the MFS5600AMMA8ESR2.

Can the MFS5600AMMA8ESR2 operate without an external BIAS_IN supply?

Yes, the MFS5600AMMA8ESR2 operates fully with BIAS_IN unconnected (0 V), drawing bias current from VIN. In this mode, minimum VIN is 4.4 V (per Table 7), enabling cold-crank operation. When BIAS_IN = 5 V is supplied, minimum VIN drops to 2.7 V and quiescent current improves slightly - but BIAS_IN is optional. The MFS5600AMMA8ESR2 is designed for flexibility in both configurations.