LTC3858IUH#PBF

DC DC Switching Controllers Overview

The LTC3858IUH#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 delivers up to 25A output current across two channels with a quiescent current of 8µA. It utilizes a constant frequency current mode architecture with a switchable frequency between 50kHz and 900kHz. Packaged in a 32-lead QFN (5mm x 5mm) for surface mount installation, it functions reliably between -40°C and +125°C.

DC DC Switching Controllers Feature Summary

• Drives all N-channel synchronous power MOSFET stages for efficient power conversion
• Minimizes input capacitor ESR power loss and noise through out-of-phase operation of two controller outputs
• Features independent TRACK/SS pins for each controller to manage output voltage ramping during startup

DC DC Switching Controllers Applications

• High output voltage synchronous poly-phase buck converters
• Low quiescent current dual output synchronous buck converters
• Distributed DC power systems requiring low IQ performance

DC DC Switching Controllers Procurement Notes

Verify the specific suffix #PBF indicates lead-free compliance when sourcing. Confirm the EUH package designation matches the required 32-lead QFN footprint for PCB layout compatibility. Ensure the operating temperature grade aligns with the intended environmental conditions. Cross-reference the manufacturer part number against official Analog Devices documentation to confirm active status and availability constraints.

DC DC Switching Controllers Selection Notes

Select this component for applications requiring dual-channel synchronous buck control with low static current consumption. The wide input voltage range accommodates various supply rails, while the phase-lockable frequency allows synchronization with other system clocks. Independent soft-start controls facilitate complex multi-rail sequencing requirements without external timing components.

DC DC Switching Controllers Part Context

This part belongs to the LTC3858 series of low IQ, dual 2-phase synchronous step-down controllers. It shares architectural similarities with other devices in the PolyPhase family but is distinct in its dual-output configuration and specific pinout. It serves as a core controller for high-efficiency power management solutions in industrial and automotive sectors.

DC DC Switching Controllers Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.