LTC3858EUH#PBF

DC DC Switching Controllers Overview

The LTC3858EUH#PBF is a low quiescent current, dual-channel, two-phase synchronous 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 delivers up to 25A of output current with a typical no-load quiescent current of 8µA. It utilizes a constant frequency current mode architecture with a switchable frequency range of 50kHz to 900kHz. The component is housed in a 32-lead QFN package and functions across an operating temperature range of -40°C to +125°C.

DC DC Switching Controllers Feature Summary

• Dual-channel architecture designed for high-efficiency two-phase interleaved operation
• Ultra-low quiescent current capability to extend battery life in portable applications
• Integrated OPTI-LOOP compensation for optimized transient response across varying capacitance loads
• Independent TRACK/SS pins enabling synchronized soft-start and output voltage tracking

DC DC Switching Controllers Applications

• High-output voltage synchronous poly-phase buck converters
• Distributed DC power systems requiring efficient voltage regulation
• Battery-operated digital devices demanding extended operational runtimes
• Automotive always-on systems utilizing wide input voltage ranges

DC DC Switching Controllers Procurement Notes

Verify the specific suffix #PBF indicates lead-free compliance when sourcing. Confirm the QFN-32 package dimensions match your PCB footprint requirements. Ensure the design accommodates the specified thermal dissipation characteristics for the 5mm x 5mm exposed pad. Cross-reference the datasheet revision date to confirm compatibility with your system's timing constraints.

DC DC Switching Controllers Selection Notes

Select this controller for designs requiring independent control of two phases to minimize input capacitor ripple. Consider the 8µA quiescent current specification if standby power consumption is critical. Evaluate the 50kHz to 900kHz frequency range against your electromagnetic interference limits and inductor size constraints. Verify that the external MOSFETs selected can handle the peak currents associated with the 25A output capability.

DC DC Switching Controllers Part Context

This component belongs to the LTC3858 series of PolyPhase controllers. It is distinct from single-phase variants like the LTC3851 and higher-pin-count models such as the LTC3859. The EUH suffix specifically denotes the 32-lead QFN package variant, differentiating it from other package options within the same functional family.

DC DC Switching Controllers Replacement Considerations

Direct substitutes include other dual-channel synchronous buck controllers from Analog Devices with similar pinouts and electrical specifications. Verify that any replacement maintains the 4V to 38V input range and compatible gate drive requirements for your existing MOSFET selection.