MC33991DWR2

Overview

The MC33991DWR2 is a multi-output power supply integrated circuit designed for automotive applications, featuring a switching step-down controller and multiple linear regulators. It operates within an input voltage range of 6.0 V to 26.5 V with 40 V transient capability. The device provides a 5.0 V output at 1400 mA from the switching regulator, a 3.3 V linear output at 400 mA, and two protected 5.0 V sensor supplies. It includes undervoltage shutdown, reset signals, and power sequencing features in an SOIC-24WB package.

Feature Summary

• Integrates a sensorless current mode control step-down switching controller for efficient main power regulation.
• Provides dedicated low-power standby linear regulators and protected sensor supply outputs.
• Includes internal protection mechanisms such as short-to-battery and short-to-ground retry capabilities.
• Supports advanced microprocessor architectures through configurable power sequencing and enable pins.

Applications

• Automotive electronic control units (ECUs)
• Multi-rail power distribution systems
• Microprocessor power management modules

Procurement Notes

Verify the specific suffix DWR2 against the manufacturer's official datasheet to confirm tape-and-reel packaging and temperature grade. Ensure compatibility with automotive qualification standards required for your application. Cross-reference pinouts and electrical characteristics with the latest revision to avoid integration errors during design-in.

Selection Notes

Select this component when a single IC solution is needed to generate multiple regulated voltages from a wide automotive input range. It is suitable for designs requiring isolated sensor supplies and robust transient protection. Consider thermal dissipation requirements for the linear regulator sections if load currents approach maximum ratings.

Part Context

This part belongs to the MC3399x family of automotive power supply ICs. These devices are engineered to simplify power architecture by combining switching and linear regulation technologies. The family typically targets high-reliability automotive environments where wide input voltage tolerance and fault protection are critical.

Replacement Considerations

Check for MC33997 variants which offer similar functionality but may differ in specific output current ratings or package options. Verify that any substitute maintains the same SOIC-24WB footprint and electrical specifications to ensure board-level compatibility without redesign.