LTC3446IDE#TRPBF

Overview

The LTC3446IDE#TRPBF is a mixed-signal power management IC from Analog Devices, integrating one synchronous buck converter and two low-dropout linear regulators. It operates with an input voltage range of 2.7V to 5.5V. The switching regulator delivers up to 400mA at a fixed 2.25MHz frequency, while the LDOs provide 300mA each. Packaged in a 14-lead DFN (4x3mm) exposed pad for surface mount installation, it supports industrial temperatures from -40°C to +85°C.

Feature Summary

• Integrates a high-efficiency synchronous buck converter with two independent low-dropout linear regulators on a single chip.
• Features a fixed 2.25MHz switching frequency to minimize external component size and reduce electromagnetic interference.
• Includes internal compensation and soft-start circuitry to simplify design implementation and ensure stable startup.

Applications

• Portable devices requiring multiple regulated voltage rails from a single lithium-ion source
• Embedded systems needing compact power solutions for microcontrollers and peripherals
• Industrial control modules operating within standard voltage ranges

Procurement Notes

Verify the specific suffix against official documentation to confirm package type and temperature rating. Confirm RoHS compliance status through manufacturer datasheets. Check current availability as distribution may vary by region. Ensure ESD handling protocols are followed during assembly due to the exposed thermal pad design.

Selection Notes

Select this component when space constraints require combining switching and linear regulation. It suits applications needing a higher-current buck rail alongside lower-current stable LDO outputs. Verify that the total power dissipation remains within the thermal limits of the DFN package for the intended ambient conditions.

Part Context

This part belongs to the LTC3446 family, designed for efficient power management in portable electronics. It consolidates multiple power functions into a small footprint, reducing board area compared to discrete solutions. The device targets applications where battery life and physical size are critical design parameters.

Replacement Considerations

LTC3446EDE#TRPBF: Identical electrical specifications but offered in a tape-and-reel packaging format instead of tubes.