LTC3890MPUH-2#PBF

DC DC Switching Controllers Overview

The LTC3890MPUH-2#PBF is a high-performance dual step-down switching regulator DC/DC controller from Analog Devices, designed to drive all N-channel synchronous power MOSFET stages. It features a constant frequency current mode architecture with a phase-lockable switching frequency range of 105 kHz to 835 kHz. The device supports an input voltage range of 4 V to 60 V and delivers up to 15 A output current per channel across two independent outputs. Operating in out-of-phase mode minimizes input capacitor ESR losses. Key electrical parameters include a typical no-load quiescent current of 50 µA, a shutdown current of 14 µA, and a precision 0.8 V reference. Output voltages are adjustable from 800 mV to 24 V. The component operates within a junction temperature range of -55°C to +150°C and is housed in a 32-lead QFN package.

DC DC Switching Controllers Feature Summary

• Dual-channel PolyPhase architecture enables out-of-phase operation to minimize input capacitor ESR power loss and noise.
• OPTI-LOOP compensation optimizes transient response across a wide range of output capacitance and ESR values.
• Independent TRACK/SS pins allow synchronized ramping of output voltages during start-up for each controller.
• Current foldback functionality limits MOSFET heat dissipation during short-circuit conditions.

DC DC Switching Controllers Applications

• Automotive always-on systems
• Battery-operated digital devices
• Distributed DC power systems

DC DC Switching Controllers Procurement Notes

Verify the specific suffix designation to ensure compatibility with required packaging formats, as variants exist in both tube and tape-and-reel configurations. Confirm that the military-grade temperature rating aligns with system environmental requirements. Cross-reference the manufacturer part number against official distributor catalogs to validate authenticity and avoid counterfeit components. Ensure the selected variant matches the intended board assembly process specifications.

DC DC Switching Controllers Selection Notes

Select this controller when designing high-efficiency dual-rail power architectures requiring wide input voltage ranges up to 60 V. The low quiescent current makes it suitable for battery-powered applications where extended run time is critical. Consider the OPTI-LOOP feature if the design utilizes diverse output capacitor types. Ensure the external MOSFET selection supports the maximum 15 A current capability while maintaining thermal performance within the specified operating temperature range.

DC DC Switching Controllers Part Context

This component belongs to the LTC3890 family of PolyPhase controllers, which are engineered for high-density power conversion. The MPUH-2 designation indicates a specific grade and package configuration within the broader product line. It serves as a core control element in synchronous buck converters, providing the necessary gate drive signals and protection logic for efficient power management in demanding electronic environments.

DC DC Switching Controllers Replacement Considerations

LTC3890EUH-2#PBF

DC DC Switching Controllers FAQ

How does the LTC3890 reduce input capacitor stress?

It operates the two controller output stages out-of-phase, which minimizes power loss and noise caused by the equivalent series resistance (ESR) of the input capacitor.

What protection mechanism is included for short circuits?

The device features current foldback, which limits MOSFET heat dissipation during short-circuit conditions to protect the power stage.