LTC3890IUH-2#TRPBF

DC DC Switching Controllers Overview

The LTC3890IUH-2#TRPBF is a high-performance dual step-down switching regulator DC/DC controller from Analog Devices Inc., designed to drive all N-channel synchronous power MOSFET stages. It operates within an input voltage range of 4V to 60V and supports two independent outputs with adjustable voltages from 800mV to 24V. The device utilizes a constant frequency current mode architecture allowing for phase-lockable frequencies between 105kHz and 835kHz. Key electrical parameters include a typical no-load quiescent current of 50µA, shutdown current of 14µA, and a maximum duty cycle of 99%. It features a precision 0.8V reference and is housed in a 32-WFQFN package.

DC DC Switching Controllers Feature Summary

• Dual channel architecture with independent TRACK/SS pins for synchronized or staggered output ramping during startup.
• OPTI-LOOP® compensation technology optimizes transient response across a wide range of output capacitance and ESR values.
• Current foldback mechanism limits MOSFET heat dissipation effectively during short-circuit conditions.
• Out-of-phase operation of the two controller output stages minimizes power loss and noise associated with input capacitor ESR.

DC DC Switching Controllers Applications

• Automotive always-on systems requiring robust high-voltage input handling.
• Battery-operated digital devices benefiting from low quiescent current extension of run time.
• Distributed DC power systems utilizing multiple regulated rails.

DC DC Switching Controllers Procurement Notes

Verify the specific suffix #TRPBF indicates tape and reel packaging when ordering. Confirm that the 'I' grade designation meets the required industrial temperature range specifications for your application environment. Ensure compatibility with the 32-QFN footprint on your PCB layout. Cross-reference the datasheet revision date against your design timeline to account for any potential manufacturing changes or PCNs issued by Analog Devices Inc.

DC DC Switching Controllers Selection Notes

Select this component when a dual-output buck solution is needed with inputs up to 60V. The PolyPhase series offers integrated phase control to reduce input ripple. Consider the 50µA sleep mode current for battery efficiency requirements. Verify that the external MOSFETs selected can handle the peak currents generated by the controller's gate drive capabilities at the chosen switching frequency.

DC DC Switching Controllers Part Context

This part belongs to the LTC3890 family, which includes variants like the EUH and MPUH. The IUH-2 variant specifically denotes the industrial temperature grade and the dual-output configuration. It is distinct from single-output controllers or lower voltage families like the LTC3809. The '2' suffix typically indicates the dual-channel capability within the product line.

DC DC Switching Controllers Replacement Considerations

LTC3890EUH-2#PBF

DC DC Switching Controllers FAQ

How does the OPTI-LOOP compensation benefit the design?

It allows the transient response to be optimized over a wide range of output capacitance and ESR values, reducing the need for precise component selection during the design phase.

What is the function of the independent TRACK/SS pins?

These pins allow each controller to ramp its output voltage independently during start-up, enabling flexible sequencing or tracking of multiple output rails.