LT3970IDDB-5#TRMPBF

Overview

The LT3970IDDB-5#TRMPBF is a monolithic buck switching regulator manufactured by Analog Devices Inc. It features a wide input voltage range of 4.2V to 40V and delivers a fixed output voltage of 5V at up to 350mA. The device operates with a quiescent current of 1.8µA and supports an adjustable switching frequency from 200kHz to 2.2MHz. Packaged in a 10-lead DFN, it functions within a temperature range of -40°C to +125°C.

Feature Summary

• Integrates a high-voltage NPN pass transistor capable of accepting input voltages up to 40V.
• Provides low quiescent current consumption for efficient battery-powered operation.
• Supports adjustable switching frequencies to optimize external component size and efficiency.

Applications

• Industrial control systems requiring wide input voltage tolerance
• Battery-powered instrumentation with strict power budget constraints
• Embedded systems utilizing 12V or 24V bus architectures

Procurement Notes

Verify the specific suffix #TRMPBF confirms the tape-and-reel packaging format and lead-free (PbF) compliance status required for surface-mount assembly processes. Confirm that the IDDB package designation matches the intended footprint on the printed circuit board layout. Ensure the operating temperature grade aligns with the environmental conditions of the final application design.

Selection Notes

Select this component when a fixed 5V output is required from a variable or high-voltage source between 4.2V and 40V. Choose this part over adjustable variants if system design simplification is prioritized over programmable output settings. Consider the thermal performance of the DFN package relative to the expected load current and ambient temperature constraints.

Part Context

This part belongs to the LT3970 family of high-voltage step-down regulators designed for applications where standard low-voltage controllers cannot interface directly with higher supply rails. The IDDB variant specifically denotes the 10-lead DFN package configuration, distinguishing it from MSOP or other housing options within the same electrical specification set.

Replacement Considerations

LT3970IDDB-3.3#TRMPBF: Provides identical electrical characteristics and pinout but outputs a fixed 3.3V instead of 5V.

FAQ

What is the maximum input voltage supported by the LT3970IDDB-5?

The device accepts a continuous input voltage range up to 40V.

Is the switching frequency fixed or adjustable?

The switching frequency is adjustable via an external resistor, allowing selection between 200kHz and 2.2MHz.