MC33397DWR2

Overview

The MC33397DWR2 is a medium-power, multi-output power supply integrated circuit designed for automotive applications. It operates over an input voltage range of 6.0 V to 26.5 V with 40 V transient capability. The device integrates a sensorless current mode control step-down switching controller regulating to 5.0 V, a 3.3 V linear regulator using an external pass transistor, and a low-power standby linear regulator. It also provides two protected 5.0 V sensor supplies. Key features include undervoltage shutdown with retry, reset signals, power-up delay, enable pins, and power sequencing capabilities.

Feature Summary

• Integrates a step-down switching controller and multiple linear regulators for comprehensive power management
• Provides protected sensor supply outputs with short-to-battery and short-to-ground protection and retry capability
• Supports advanced microprocessor architectures through dedicated power sequencing and enable pin functionality

Applications

• Automotive electronic control units requiring multi-rail power distribution
• Systems utilizing advanced microprocessor architectures needing precise power sequencing
• Applications requiring robust sensor supply protection against electrical faults

Procurement Notes

Verify the specific suffix DWR2 confirms the tape-and-reel packaging format when sourcing. Confirm RoHS compliance status as historical Motorola/NXP data may vary by production batch. Ensure the external pass transistor for the 3.3 V LDO is included in the design, as it is not internal to the IC. Validate that the SOIC-24WB package dimensions match the target PCB footprint requirements.

Selection Notes

Select this component when a single IC solution is needed for mixed switching and linear regulation in automotive environments. It is suitable for designs requiring isolated or protected sensor rails alongside main processor supplies. Consider the thermal performance of the external pass transistor if high load currents are expected on the 3.3 V rail. Verify compatibility with the target microprocessor's power-up timing requirements.

Part Context

The MC33397 belongs to the NXP (formerly Motorola/Freescale) automotive power management portfolio. It is part of a family of multi-output power supply ICs designed to simplify board space and reduce component count in complex automotive electronics. The device replaces discrete solutions combining buck converters, LDOs, and protection circuits.

Replacement Considerations

MC33997DW

FAQ

How is the 3.3 V linear regulator output achieved?

The 3.3 V linear regulator (VDDL) requires an external pass transistor to handle power dissipation, rather than being fully integrated internally.

What protection features are available for the sensor supplies?

The two 5.0 V sensor supplies are protected against short-to-battery and short-to-ground conditions with automatic retry capability.