LTC3631IDD#PBF

Voltage Regulators - DC DC Switching Regulators Overview

The LTC3631IDD#PBF is a high-efficiency, high-voltage synchronous step-down DC/DC converter manufactured by Analog Devices Inc. It operates with an input voltage range of 4.5V to 45V and provides a single adjustable output from 0.8V to 45V. The device delivers up to 100mA of load current while maintaining a typical quiescent supply current of only 12µA at no load. It features internal high-side and synchronous power switches, a programmable peak current limit, and a shutdown pin for power management. The component is housed in an 8-lead DFN package (3x3mm) with an exposed thermal pad, designed for surface-mount installation.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates internal high-side and synchronous power switches for high efficiency across the operating range.
• Maintains low power consumption with a typical 12µA DC supply current at no load while regulating output voltage.
• Includes a programmable peak current limit to optimize efficiency in lower current applications.
• Supports positive or negative output configurations via external resistor network adjustment.

Voltage Regulators - DC DC Switching Regulators Applications

• Positive-to-negative converter circuits
• High voltage step-down DC/DC conversion
• Battery-powered systems requiring low quiescent current
• Industrial control modules

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix #PBF indicates lead-free and RoHS compliance status before procurement. Confirm the package type matches the design requirements, as the IDD variant uses an 8-WFDFN package. Ensure the ordering information aligns with the manufacturer's current datasheet specifications to avoid discrepancies in electrical characteristics or pinout definitions during integration.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a compact solution is required for high-voltage inputs up to 45V with moderate load currents around 100mA. The adjustable output allows flexibility for various logic levels. Consider the thermal performance of the exposed pad design for heat dissipation. Compare against other family members like the LTC3630 or LTC3632 if higher current capacity or different input voltage ranges are needed for the specific application constraints.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LTC3631 series of high-efficiency, high-voltage synchronous step-down converters. The series is characterized by its ability to operate from wide input voltage ranges while maintaining low standby power consumption. The IDD designation specifically refers to the industrial temperature grade and the 8-lead DFN package configuration, distinguishing it from MSOP variants within the same functional family.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Direct substitutes include other parts within the LTC3631 family such as the LTC3631EMS8E#PBF, which offers the same functionality but in an MSOP-8 package. For applications requiring higher current, the LTC3630 series may be considered, though it differs in package and current capabilities. Verify pin compatibility and thermal requirements when switching between package types.

Voltage Regulators - DC DC Switching Regulators FAQ

Can the LTC3631IDD#PBF generate a negative output voltage?

Yes, the device supports both positive and negative output configurations, allowing it to function as a positive-to-negative converter when configured appropriately with external components.

What is the maximum input voltage supported by this converter?

The LTC3631IDD#PBF supports a maximum input voltage of 45V, making it suitable for high-voltage step-down applications.

How does the device manage efficiency at light loads?

It maintains high efficiency at light loads by drawing only 12µA of typical DC supply current at no load while continuing to regulate the output voltage effectively.