LTC3406ES5#TR

LTC3406ES5#TR is a Linear Technology (now Analog Devices) buck (step-down) switching regulator IC. It’s used to convert a higher input voltage to a lower, regulated output in compact, battery-powered systems.
Key points
- Topology: current‑mode switching regulator with an external inductor and diode (or synchronous rectifier, depending on variant) to implement a buck converter.
- Output: adjustable via external feedback resistors.
- Features: enable/shutdown, protection (overcurrent/thermal/undervoltage), soft-start, and good efficiency for portable power.
- Typical use: powering microcontrollers, sensors, and other low/medium power rails from batteries or USB-type sources.
Package/ordering suffixes
- ES5: a device revision/temperature-grade variant (specific to the part release).
- #TR: Tape-and-Reel packaging (for automated assembly).
For exact electrical specs, pinout, typical application circuit, and recommended external components, refer to the LTC3406ES5#TR datasheet. If you share your target input/output voltages and load, I can sketch a sample circuit.

8-pin MSOP (Plastic MSOP-8) package, Tape & Reel (TR).

- Pin count: 16 pins (ES5 package, TSOP/MSOP style; Tape & Reel indicated by #TR).
- Function: Dual buck DC-DC converter (two independent switching regulator channels) in one package. Each channel has its own switch node (LX1/LX2), feedback (FB1/FB2), and enable/soft-start features, sharing VIN and GND. Suitable for generating two lower rails from a common input.

Manufacturer: Analog Devices, Inc. (the LTC prefix comes from Linear Technology, which is now a subsidiary of Analog Devices).
What kind of company: A multinational semiconductor company that designs and manufactures analog, mixed-signal, and power-management integrated circuits.

Applications include:
- Portable, battery-powered devices (cell phones, wearables, handheld meters)
- Embedded/industrial systems needing efficient high-to-low conversion (3.3V/5V rails)
- Automotive and harsh-environment power management (9–24V to low rails)
- Post-regulation for CPUs, DSPs, FPGAs, RF front-ends
- Energy harvesting and backup power supplies
- Distributed power architectures and point-of-load regulation

Direct one-for-one equivalents for LTC3406ES5#TR do not exist. It’s a buck-boost DC-DC converter. Closest functionally equivalent devices from other vendors include TI’s TPS63060/TPS63061 buck-boost regulators. For an exact substitute, use LTC’s cross-reference tool or distributor cross-reference databases to match input range, output, current, package, and features.