LT3690MPUFE#PBF

Overview

The LT3690MPUFE#PBF is an automotive-grade, adjustable frequency monolithic buck switching regulator manufactured by Analog Devices. It accepts input voltages from 3.9V to 36V and provides a single adjustable output voltage ranging from 800mV to 20V with a maximum output current of 4A. The device operates at a switching frequency up to 1.5MHz and features a typical quiescent current of 70µA. It utilizes a synchronous step-down topology with internal power switches of 90mΩ and 30mΩ resistance. The component is housed in a 26-pin QFN EP package and supports an operating temperature range from -40°C to +150°C.

Feature Summary

• Automotive qualified reliability for harsh environment applications
• Integrated high-efficiency synchronous rectification eliminating external catch diodes
• Adjustable switching frequency allows optimization for size and performance
• Low quiescent current operation enhances efficiency in standby modes

Applications

• Automotive infotainment systems
• Telematics control units
• Body electronics modules
• Industrial motor drives

Procurement Notes

Verify the specific suffix 'MPU' indicates automotive grade qualification and extended temperature range compared to standard variants. Confirm RoHS compliance status through official documentation. Check for active lifecycle status as availability may vary. Ensure the QFN-26 package footprint matches the design PCB layout requirements before finalizing procurement.

Selection Notes

Select this component when designing for automotive environments requiring high input voltage tolerance up to 36V. The 4A output capability suits moderate power loads in vehicle subsystems. Consider the adjustable frequency feature if electromagnetic interference (EMI) constraints require shifting the switching noise away from sensitive bands. Verify thermal management strategies are adequate for the QFN-26 package under maximum load conditions.

Part Context

This part belongs to the LT3690 family of synchronous step-down regulators designed for high-performance power conversion. The MPU suffix specifically denotes the automotive grade version, ensuring robustness against vibration and extreme temperatures common in vehicle architectures. It serves as a key power management integrated circuit (PMIC) within the broader portfolio of Analog Devices switching regulators.

Replacement Considerations

LT3690HIFE#PBF: Standard industrial grade equivalent without automotive qualification.