LTC3858EUH-2#PBF

DC DC Switching Controllers Overview

The LTC3858EUH-2#PBF is a high-performance dual step-down switching regulator controller manufactured by Analog Devices Inc. It operates within an input voltage range of 4V to 38V and supports output voltages from 800mV to 24V. The device features a constant frequency current mode architecture with a phase-lockable switching frequency between 75kHz and 850kHz. It includes two independent outputs, each capable of driving N-channel synchronous power MOSFETs. Key electrical parameters include a typical quiescent current of 400µA, a maximum duty cycle of 99%, and operation across a temperature range of -40°C to +125°C TJ.

DC DC Switching Controllers Feature Summary

• Dual channel architecture designed for out-of-phase operation to minimize input capacitor ESR power loss and noise
• Constant frequency current mode control allowing phase-lockable frequencies up to 850kHz
• Independent TRACK/SS pins enabling synchronized ramping of output voltages during startup

DC DC Switching Controllers Applications

• High efficiency synchronous poly-phase buck converters
• Battery operated digital devices requiring low quiescent current
• Distributed DC power systems

DC DC Switching Controllers Procurement Notes

Verify the specific suffix #PBF indicates lead-free compliance and RoHS adherence when sourcing. Confirm the QFN-32 package dimensions match your PCB footprint requirements. Ensure the selected variant aligns with the required output voltage range and thermal management capabilities for your specific application environment.

DC DC Switching Controllers Selection Notes

Select this component for applications requiring dual isolated or non-isolated outputs from a single controller. Consider the 4V to 38V input range suitability for standard bus architectures. Evaluate the need for phase-lockable frequencies if synchronization with other system clocks is required. Verify that the external MOSFET selection supports the drive capability and switching speeds compatible with the 850kHz maximum frequency.

DC DC Switching Controllers Part Context

This part belongs to the LTC3858 family of low IQ, dual 2-phase synchronous step-down controllers. It shares architectural similarities with variants like the LTC3858EGN-1 but differs in package type and specific pinout configuration. The EUH-2 designation specifies the QFN-32 package and internal resistor network configuration for feedback divider setting.

DC DC Switching Controllers Replacement Considerations

Direct replacements within the same family include the LTC3858EUH-1#PBF, which offers similar performance characteristics but may differ in internal resistor values or pin compatibility. Cross-family comparisons should consider the LTC3890 series for higher input voltage requirements.