LT3790MPFE

Overview

The LT3790MPFE is a synchronous, four-switch buck-boost voltage and current regulator controller from Analog Devices. It regulates output voltage, output current, or input current regardless of whether the input voltage is higher than, lower than, or equal to the output voltage. The device features an integrated synchronous rectifier and supports switching frequencies between 200kHz and 700kHz. It operates with a supply voltage range of 4.7V to 60V and includes clock synchronization capabilities. The component is designed for automotive applications, operating within a temperature range of -55°C to 150°C.

Feature Summary

• Synchronous four-switch buck-boost topology enabling regulation when input voltage exceeds, falls below, or equals the output voltage
• Integrated synchronous rectifiers to optimize efficiency and reduce external component count
• Programmable switching frequency ranging from 200kHz to 700kHz with clock synchronization support
• Automotive-grade reliability with extended operating temperature range up to 150°C

Applications

• Automotive power systems requiring wide input voltage ranges
• Battery-powered equipment with varying charge states
• Industrial control systems needing stable regulation across fluctuating inputs
• Telecommunications infrastructure with variable bus voltages

Procurement Notes

Verify the specific suffix PBF indicates lead-free compliance and RoHS standards. Confirm the MP designation aligns with automotive qualification requirements. Ensure the 38-TSSOP-EP package matches your PCB footprint and thermal management strategy. Cross-reference the manufacturer's latest datasheet for any updates to electrical characteristics or recommended operating conditions before finalizing procurement.

Selection Notes

Select this controller when input voltage may vary significantly around the target output level. The synchronous design reduces external gate drive requirements compared to non-synchronous alternatives. Consider the 200kHz to 700kHz frequency range for balancing efficiency and EMI performance. Verify that the 60V maximum supply voltage accommodates your system's peak transient conditions without exceeding limits.

Part Context

The LT3790 series represents Analog Devices' solution for complex DC-DC conversion challenges where traditional buck or boost topologies are insufficient. The MP variant specifically targets automotive environments, offering enhanced robustness against thermal stress and voltage transients common in vehicle electrical systems. This controller integrates advanced timing and protection features into a compact surface-mount package.

Replacement Considerations

LT3790IFE#PBF: Non-automotive grade version with similar electrical specifications but different temperature rating.

FAQ

Does the LT3790MPFE support external clock synchronization?

Yes, the device includes clock synchronization capabilities to allow alignment with other switching regulators in the system.

What is the maximum supply voltage for the LT3790MPFE?

The maximum supply voltage (Vcc/Vdd) for the LT3790MPFE is 60V.