LT3957AEUHE

Overview

The LT3957AEUHE is a wide input range, current mode DC/DC converter capable of generating positive or negative output voltages. It features an internal low-side N-channel power MOSFET rated for 40V at 5A, driven by an internal regulated 5.2V supply. The device supports boost, flyback, SEPIC, and inverting topologies. Input voltage ranges from 3V to 40V with a maximum output voltage of 40V. It operates at a fixed switching frequency of 1MHz and has a quiescent current of 1µA. The component functions within a temperature range of -40°C to +125°C and is housed in a QFN-36 package.

Feature Summary

• Integrates a 40V, 5A internal low-side N-channel power MOSFET driven by a regulated 5.2V supply.
• Supports versatile configurations including boost, flyback, SEPIC, and inverting converters.
• Utilizes a fixed frequency, current-mode architecture for stable operation across wide input and output voltage ranges.

Applications

• Industrial control systems requiring isolated or non-isolated DC/DC conversion
• Battery-powered equipment needing wide input voltage tolerance
• Automotive electronics utilizing boost or inverting topologies

Procurement Notes

Verify the specific suffix (EUHE) against the manufacturer's official datasheet to confirm pinout compatibility and thermal pad requirements. Ensure the selected variant matches the required operating temperature range and packaging specifications. Cross-reference the part number with Analog Devices documentation to validate electrical parameters before integration into the design.

Selection Notes

Select this component when a high-current, wide-input range converter is needed for multiple topology applications. Consider the 1MHz switching frequency for balancing efficiency and component size. Evaluate the thermal performance within the QFN-36 package relative to the expected load current and ambient conditions to ensure reliable operation.

Part Context

The LT3957AEUHE belongs to the LT3957 series of DC/DC converters manufactured by Analog Devices. This series is designed for applications requiring flexible power conversion architectures. The EUHE designation indicates a specific package type and temperature grade within the product line, distinguishing it from other variants in the family.

Replacement Considerations

LT3958EUHE#PBF offers similar functionality with different current ratings and input voltage limits. Verify electrical compatibility and pinout alignment before substitution.

FAQ

Can the LT3957AEUHE generate negative output voltages?

Yes, the device is capable of generating either positive or negative output voltages when configured as an inverting converter.

What is the maximum switch current rating?

The internal low-side N-channel power MOSFET is rated for 5A.