NXP Semiconductors MCZ33730EKR2

Overview

MCZ33730EKR2 from NXP Semiconductors (formerly Freescale) is an automotive-grade multi-output power supply IC integrating a 3.5 A step-down switching regulator and three programmable linear regulators (VDD3, VDDL, VKAM) with reverse battery protection FET drive and dual 5.0 V protected sensor supplies. It operates from 4.5–26.5 V input, delivers 5.0 V @ 2.0 A (VDDH), supports 3.3 V/5.0 V programmable outputs with ±3% or ±15% accuracy, and targets ECU power management for 32-bit microcontrollers.

For engineers reviewing the MCZ33730EKR2 datasheet, MCZ33730EKR2 pinout, MCZ33730EKR2 application, or MCZ33730EKR2 equivalent, key selection criteria include its adjustable 100–500 kHz buck frequency, slew-rate control via SR pin, hardware reset timer (HRT), four independent open-drain reset outputs (RSTH/RSTL/RST3/RSTKAM), and support for sleep/wake sequencing in automotive body control modules and powertrain ECUs.

Technical Context

The MCZ33730EKR2 implements a fixed-frequency voltage-mode PWM buck controller with external frequency programming (FREQ pin), adjustable slew-rate (SR pin connection options), and internal charge pump (CP pin) enabling gate drive under low-battery conditions. Its linear regulators use external NPN pass transistors (VDDL_B/VDD3_B base drive pins) and support dual operating modes: Normal (VDD3/VDDL + VKAM) or Standby (VKAM + VDD3_SBY + VDDL).

Supervision includes independent reset detection on VDDH, VDDL, VDD3, and VKAM with programmable thresholds, hardware reset timing via HRT resistor, ignition-controlled wake-up (VIGN), and MCU-hold functionality (REGON). Protection features cover thermal shutdown (150–195 °C), overvoltage lockout (35–42 V), undervoltage lockout (3.6–4.4 V), and reverse-battery FET drive (PFD pin).

Key Specifications

Pinout & Package

MCZ33730EKR2 uses a 32-lead SOICW-EP (exposed pad) package with thermal resistance RθJ-C = 1.2 °C/W. The exposed pad is electrically and thermally connected to GND.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multi-output automotive power supply applications.

Compared with MC33730EK, MCZ33730EKR2 offers identical core regulation but slightly relaxed reset detection; versus MPQ4333-AEC1, it provides integrated sensor protection, reverse-battery FET drive, and programmable multi-rail sequencing - reducing total system component count by ≥12 parts in full-featured automotive ECUs.

Availability

MCZ33730EKR2 is available at Aetrix Electronics and suitable for engine control units, body control modules, transmission control units, and ADAS electronic control units requiring stable component supply across automotive production lifecycles.

Supply support for MCZ33730EKR2 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 focused on automotive, industrial, and IoT applications, with deep expertise in automotive power management and functional safety.

The MCZ33730EKR2 belongs to NXP's automotive power supply IC family designed specifically for 32-bit microcontroller-based ECUs, emphasizing integrated protection, low-quiescent-current sleep mode, and robust voltage supervision for ASIL-B systems.

FAQ

What is the maximum input voltage rating for MCZ33730EKR2 on the KA_VBAT pin?

The MCZ33730EKR2 has a maximum KA_VBAT pin rating of +40 V, with overvoltage shutdown triggered between 35 V and 42 V. This withstand capability supports automotive load-dump transients per ISO 7637-2 Pulse 5a, ensuring reliable operation when alternator regulation fails. The device remains functional up to 26.5 V under normal operation, and the 40 V absolute maximum rating provides design margin against transient spikes.

How does the slew-rate control (SR pin) affect EMI performance in MCZ33730EKR2?

The SR pin on the MCZ33730EKR2 directly controls the rise/fall time of the SW node: connecting SR to SW yields slow slew-rate (0.96 V/ns), to BOOT gives fast (2.38 V/ns), and leaving it open provides medium (1.82 V/ns). Slower edges reduce high-frequency harmonic content, lowering conducted EMI - critical for passing CISPR 25 Class 5 in automotive ECUs. This feature allows EMI tuning without changing layout or magnetics.

Can MCZ33730EKR2 support both VDD3 and VKAM as simultaneous standby regulators?

Yes, the MCZ33730EKR2 supports VKAM as a mandatory standby regulator (active down to 4.5 V on KA_VBAT) and VDD3 as an optional second standby regulator (VDD3_SBY) with ±15% accuracy. Configuration is set via P1/P2/P3 logic states per Table 7 in the datasheet. When enabled, VDD3_SBY draws additional ~100 µA quiescent current, keeping total sleep IQ ≤600 µA - compliant with stringent automotive quiescent current requirements.

What is the purpose of the PFD pin on MCZ33730EKR2, and how is it used?

The PFD (Protection FET Drive) pin on the MCZ33730EKR2 provides gate drive for an external N-channel MOSFET used in reverse-battery protection circuits. It actively pulls the FET gate low during normal operation and disables drive during reverse polarity, blocking current flow. This eliminates the need for lossy series diodes, improving efficiency and thermal performance in battery-connected automotive modules - a key differentiator versus basic buck-LDO solutions.

Does MCZ33730EKR2 include built-in thermal protection, and what are its trip thresholds?

Yes, the MCZ33730EKR2 incorporates thermal shutdown with junction trip thresholds ranging from 150 °C to 195 °C depending on the regulator block (e.g., 150–190 °C for VKAM/VDD3_SBY, 155–195 °C for buck regulator), and hysteresis of 1.0–20 °C. These thresholds are guaranteed by design and prevent permanent damage during overload or inadequate heatsinking. The exposed pad (GND-connected) enables efficient heat dissipation with RθJ-C = 1.2 °C/W.