LT3757IDD

Overview

The LT3757IDD is a wide input range, current mode DC/DC controller capable of generating positive or negative output voltages. It supports Boost, Flyback, SEPIC, and Inverting topologies with an input voltage range of 2.9V to 40V. The device features a single feedback pin for programmable output configuration and allows adjustable switching frequencies from 100kHz to 1MHz via an external resistor. It includes clock synchronization capability, soft-start, and input undervoltage lockout. The component operates within a junction temperature range of -40°C to 125°C and is housed in a 10-lead DFN (3x3) package.

Feature Summary

• Supports multiple converter topologies including Boost, Flyback, SEPIC, and Inverting configurations
• Enables direct connection to positive or negative output dividers via novel FBX pin architecture
• Provides excellent transient response through current mode control
• Features low shutdown quiescent current suitable for battery-operated systems

Applications

• Single-cell lithium-ion battery portable electronics
• High voltage automotive power supplies
• Industrial power supplies

Procurement Notes

Verify the specific suffix IDD against the manufacturer's official datasheet to confirm the exact operating temperature grade and package variant. Ensure compatibility with the required switching frequency range and topology. Cross-reference the part number with Analog Devices documentation to validate pinout and electrical specifications before integration into the design.

Selection Notes

Select this controller when a wide input voltage range up to 40V is required alongside flexible output polarity options. It is suitable for designs needing synchronous rectification support or clock synchronization. Consider the thermal performance of the exposed pad DFN package for high-power applications requiring operation up to 125°C junction temperature.

Part Context

The LT3757 series is manufactured by Analog Devices, formerly Linear Technology. This family of controllers is designed for high-efficiency power conversion in compact spaces. The LT3757IDD specifically denotes the industrial temperature grade version packaged in a 10-lead DFN format, distinguishing it from other variants in the product line.

Replacement Considerations

Consult Analog Devices documentation for verified substitute part numbers within the LT3757 family or compatible controllers. Verify pin-to-pin compatibility and electrical parameter alignment before substitution.