LTC3728LEGN-1

DC DC Switching Controllers Overview

The LTC3728LEGN-1#PBF is a dual high-performance step-down switching regulator controller from Analog Devices, designed to drive all N-channel synchronous power MOSFET stages. It operates within an input voltage range of 4.5 V to 28 V and supports output voltages of 3.3 V and 5 V. The device delivers up to 25 A of output current across two outputs. It features a constant frequency current mode architecture with a switchable frequency up to 550 kHz. The controller includes low quiescent current operation at 20 uA and functions reliably within a temperature range of -40°C to +85°C.

DC DC Switching Controllers Feature Summary

• Dual channel architecture for independent or interleaved synchronous buck regulation
• Constant frequency current mode control allowing phase-lockable frequencies up to 550 kHz
• Low static current consumption for improved efficiency in standby modes
• Integrated soft start and shutdown capabilities for controlled power sequencing

DC DC Switching Controllers Applications

• High efficiency dual rail power supplies requiring 5V and 3.3V outputs
• Industrial systems utilizing external frequency synchronization
• Telecommunications infrastructure power management units
• Embedded computing platforms requiring synchronized multi-phase conversion

DC DC Switching Controllers Procurement Notes

Verify the specific suffix designation against the manufacturer's official datasheet to confirm pinout compatibility and electrical specifications. Ensure the SSOP-28 package variant matches the target PCB footprint requirements. Cross-reference the lot code and revision history to guarantee compliance with current RoHS standards and manufacturing updates before finalizing procurement orders.

DC DC Switching Controllers Selection Notes

Select this component when designing dual-output buck converters requiring high current capability and precise synchronization. The fixed internal frequency options suit applications where EMI filtering is critical. Consider the thermal performance of the SSOP-28 package relative to the expected load current and ambient conditions. Verify that the external MOSFET selection aligns with the controller's gate drive capabilities for optimal switching performance.

DC DC Switching Controllers Part Context

This part belongs to the LTC3728L family of dual synchronous step-down controllers. It shares core architectural similarities with other variants like the LTC3728LCUH but differs in package type and specific electrical tolerances. The L-series typically denotes standard commercial grade performance with defined operating temperature ranges suitable for general industrial and commercial electronics applications.

DC DC Switching Controllers Replacement Considerations

Direct substitutes include other members of the LTC3728L family such as the LTC3728LCGN or LTC3728LIUH-1, provided the package form factor and pinout are compatible. Verify that alternative parts support the required 550 kHz switching frequency and input voltage range. Ensure any replacement maintains the same dual-channel synchronous control logic and N-channel MOSFET drive requirements.