LT3845EFE#TRPBF

LT3845EFE#TRPBF is Linear Technology/Analog Devices’ high-voltage, current‑mode switching regulator controller, commonly used for LED drivers and power supplies. It requires an external MOSFET and sense resistor and can be configured in buck, boost, or buck–boost topologies to regulate output current or voltage with high efficiency. Key features typically include peak current–mode control, adjustable switching frequency, soft-start, and protections such as overcurrent, undervoltage, and thermal shutdown, plus an enable/shutdown input for controlled startup.
Suffix/tracking:
- EFE: Pb-free, extended-temperature grade (industrial/extended temp range).
- #TRPBF: Tape-and-Reel packaging, Pb-free.
Note: exact voltage range, topology options, and pins may vary by package and revision; consult the latest datasheet for your specific variant.

Here are the key features of the LT3845EFE#TRPBF (Pb-free, Tape & Reel) DC-DC buck controller:
- Wide input range up to about 60 V suitable for automotive/distributed power.
- External N-channel MOSFET gate drive with current-mode PWM control.
- Cycle-by-cycle current limiting for robust overcurrent protection.
- Programmable switching frequency via RT resistor (and stable fixed options in variants).
- Programmable soft-start to limit inrush and enable controlled output ramp.
- Feedback-regulated output with external resistors for adjustable output voltage.
- Protection features: UVLO/enable input, overvoltage protection, overcurrent/short-circuit protection, thermal shutdown.
- Light-load efficiency improvements (burst/skip-type operation typical in such devices).
- Fault handling and robust operation over wide temperature range (industrial/automotive).
- Package: Pb-free, 8-lead (MSOP/SOIC) with TRPBF tape-and-reel option.
Note: exact switching frequency, pinout, and special modes may vary by package variant; consult the data sheet for precise electrical specs.

LT3845EFE#TRPBF comes in a 16‑lead MSOP (Micro‑Small‑Outline Package), Pb‑free, with Tape and Reel (TRPBF) packaging.

Pin count: 28 pins.
Function: LT3845EFE#TRPBF is a high-voltage, constant-frequency, current‑mode PWM controller for a switching regulator (buck/synchronous buck) using external N‑channel MOSFETs. It includes an oscillator, enable/soft-start, feedback/error amplifier, current‑sense input, and dual gate‑drive outputs to drive the external MOSFETs for efficient power conversion.

- Manufacturer: Analog Devices, Inc. (ADI). The LT3845 was originally from Linear Technology and is now produced by Analog Devices after their acquisition of Linear Technology in 2017.
- What kind of company: Analog Devices is a multinational American semiconductor company that designs and manufactures analog, mixed-signal, and DSP integrated circuits.

Applications include:
- High-voltage constant-current LED driver (buck topology) for automotive and general lighting
- High-voltage DC-DC buck regulator for LED backlights, signage, and industrial power supplies
- Automotive power electronics and other 60V systems requiring efficient, compact current/voltage regulation