LTC3890EGN-3#PBF

DC DC Switching Controllers Overview

The LTC3890EGN-3#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 programmable switching frequency range of 105 kHz to 835 kHz and supports up to 99% duty cycle. The device operates on an input voltage range of 4 V to 60 V and provides two independent output channels. It includes a precision 0.8 V reference, OPTI-LOOP compensation for optimized transient response, and independent TRACK/SS pins for synchronized start-up. Quiescent current is typically 50 μA in sleep mode (one channel on) and 14 μA in shutdown.

DC DC Switching Controllers Feature Summary

• Dual-channel synchronous buck control with out-of-phase operation to minimize input capacitor ESR noise
• OPTI-LOOP compensation technology for stable transient response across varying output capacitance and ESR values
• Independent soft-start and tracking pins for each controller to manage sequential or simultaneous ramping
• Current foldback protection mechanism to limit MOSFET heat dissipation during short-circuit conditions

DC DC Switching Controllers Applications

• Automotive always-on systems requiring wide input voltage tolerance
• Battery-operated digital devices benefiting from low quiescent current operation
• Distributed DC power systems utilizing high-voltage bus distribution
• Industrial equipment needing precise dual-rail voltage regulation

DC DC Switching Controllers Procurement Notes

Verify the specific suffix designation against the manufacturer's official documentation to confirm pinout compatibility and thermal pad configuration. Ensure the ordering information matches the exact package type and temperature grade required for the application environment. Cross-reference the datasheet revision history for any recent manufacturing site changes that may affect mechanical dimensions or material composition prior to finalizing procurement orders.

DC DC Switching Controllers Selection Notes

Select this component when a dual-output synchronous buck solution is required with a high maximum input voltage capability up to 60 V. Consider the SSOP-28 package constraints regarding thermal dissipation and PCB layout space compared to QFN alternatives. Evaluate the need for independent channel control versus shared frequency synchronization based on system noise sensitivity requirements and transient load performance specifications.

DC DC Switching Controllers Part Context

This part belongs to the LTC3890 family of PolyPhase controllers, which are engineered for high-efficiency power conversion in demanding environments. The EG suffix indicates a specific commercial-grade temperature range and package variant within the broader product line. It complements other variants like the EUH and MPUH series by offering distinct packaging options while maintaining core electrical performance characteristics defined by the Analog Devices power management portfolio standards.

DC DC Switching Controllers Replacement Considerations

LTC3890EGN-1#PBF

DC DC Switching Controllers FAQ

What is the typical quiescent current in sleep mode?

The typical quiescent current is 50 μA when one channel is active in sleep mode.

Does the device support clock synchronization?

No, the LTC3890EGN-3#PBF does not feature external clock synchronization capabilities.