MC33997DWR2

Overview

The MC33997DWR2 is a medium-power, multi-output power supply integrated circuit manufactured by Freescale Semiconductor. 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 directly to a 5.0 V output (VDDH) capable of 1400 mA total current. It includes a 3.3 V linear regulator (VDDL) requiring an external pass transistor for 400 mA, a low-power standby linear regulator (VKAM) at 3.3 V/10 mA, and two protected 5.0 V sensor supplies at 200 mA each. Features include undervoltage shutdown with retry, reset signals, power-up delay, and enable pins.

Feature Summary

• Integrates a step-down switching controller and multiple linear regulators for complex power architectures
• Provides short-to-battery and short-to-ground protection with retry capability for sensor supplies
• Supports advanced microprocessor power sequencing through dedicated enable pins and reset signals

Applications

• Advanced microprocessor power supply systems
• Automotive electronic control units requiring robust transient protection
• Multi-rail power distribution networks in industrial applications

Procurement Notes

Verify the manufacturer designation as Freescale Semiconductor or NXP Semiconductors, noting that Freescale was acquired by NXP. Confirm the package type is SOIC-24WB. Ensure the specific suffix DWR2 matches the required tape-and-reel packaging configuration. Cross-reference part numbers carefully due to potential legacy naming conventions from the original Freescale era.

Selection Notes

Select this component when designing systems requiring a single IC solution for mixed-signal power management. It is suitable for applications needing a high-current switching rail alongside isolated, protected sensor supplies. Consider the requirement for an external pass transistor for the main linear regulator output when evaluating board space and thermal constraints.

Part Context

This part belongs to the Freescale 33997 family of power management ICs designed for automotive and industrial environments. It replaces discrete solutions combining buck converters and LDOs. The device simplifies design by integrating control logic, protection circuits, and sequencing features into a single compact package, reducing component count and layout complexity.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.