LTC3838EUHF-2#PBF

DC DC Switching Controllers Overview

The LTC3838EUHF-2#PBF is a dual-channel, PolyPhase synchronous step-down DC/DC switching regulator controller manufactured by Analog Devices. It operates with an input voltage range of 4.5 V to 38 V and supports output voltages from 600 mV to 5.5 V. The device features a switchable frequency between 200 kHz and 2 MHz, with a typical operating supply current of 3 mA and quiescent current of 15 µA. Packaged in a 38-pin QFN (5x7 mm) with exposed pad, it functions within a temperature range of -40°C to +125°C. This controller drives all N-channel power MOSFETs via two independent channels.

DC DC Switching Controllers Feature Summary

• Dual independent channels drive all N-channel power MOSFETs for flexible single or multi-phase configurations
• Supports external reference voltage and dual differential output sensing for high accuracy
• Controlled on-time valley current mode architecture enables fast transient response without clock delay

DC DC Switching Controllers Applications

• High-performance server and workstation power distribution networks
• Industrial equipment requiring precise dual-rail power sequencing
• Telecommunications infrastructure power management systems

DC DC Switching Controllers Procurement Notes

Verify the specific suffix #PBF indicates tube packaging when ordering. Confirm the EUHF package variant matches the required thermal and footprint specifications for the PCB layout. Ensure the design supports the 4.5 V to 38 V input range and validates component compatibility with the 200 kHz to 2 MHz switching frequency options.

DC DC Switching Controllers Selection Notes

Select this component when dual isolated outputs or a high-current multi-phase single output are required. The dual differential sensing feature is critical for applications demanding high load regulation accuracy over long trace lengths. Compare against the LTC3838-1 if external reference capability is not needed, as the -2 variant specifically includes this feature for enhanced flexibility.

DC DC Switching Controllers Part Context

This part belongs to the LTC3838 series of PolyPhase controllers. It shares the core control architecture with the LTC3838-1 but adds an external reference input and dual differential sense amplifiers. The EUHF designation specifies the 38-lead QFN package type used for thermal efficiency and compact board space utilization in dense power designs.

DC DC Switching Controllers Replacement Considerations

The LTC3838IUHF-1#PBF is a related variant within the same family. Note that the -1 version lacks the external reference and dual differential sensing features found in the -2 model. Verify functional requirements before substituting, as pinouts may differ regarding reference inputs.

DC DC Switching Controllers FAQ

What is the difference between the LTC3838-1 and LTC3838-2?

The LTC3838-2 includes an external reference voltage input and dual differential output sensing capabilities, whereas the LTC3838-1 does not.

Can the two channels be combined into a single output?

Yes, the two independent channels can be combined using an external reference to create a multi-phase single-output configuration.