LTC3855EUJ#PBF

The LTC3855EUJ#PBF is a multi-rail DC-DC buck regulator controller from Analog Devices (Linear Technology). It is designed to generate multiple regulated voltages from a single higher input voltage, suitable for CPU/GPU cores, memory, FPGA, and telecom power applications. Key features typically include a wide input range, three independently programmable buck outputs, remote sense, programmable switching frequency, and protections such as overcurrent, undervoltage/overvoltage, and thermal shutdown. It generally drives external MOSFETs and requires external inductors, capacitors, and sense resistors per the reference design. The EUJ suffix denotes the package style, and #PBF indicates RoHS-compliant, lead-free packaging. For exact specifications, pinout, and application notes, consult the LTC3855 datasheet and reference designs.

Here are the typical features of LTC3855EUJ#PBF:
- Dual synchronous buck regulator controller for multiphase VRMs (two channels with interleaved operation).
- Wide input voltage range suitable for automotive/industrial environments (high input tolerance).
- Current‑mode PWM control with per‑channel cycle-by-cycle current limit.
- Drives external high‑side/low‑side MOSFETs (synchronous rectification) for high efficiency.
- Adjustable output voltages via external feedback network; supports remote sensing.
- Soft-start and tracking options; enable input; Power-On Reset (POR) and UVLO.
- Programmable switching frequency; fault latch with status indicators (PGOOD/FAULT).
- Comprehensive protection: overcurrent/short-circuit, overvoltage, undervoltage, and thermal shutdown.
- Safe-start behavior with fault recovery and auto-retry capabilities.
- Pb‑free packaging (PBF) in EUJ package.
Note: exact MOSFET configuration (external vs. internal) and specific voltage/frequency ranges are from the datasheet; the list covers key capabilities typical of the LTC3855 family.

- Pin count: 28 pins (28-lead EUJ package)
- Function: Dual-channel, two‑phase interleaved synchronous buck regulator controller (external MOSFETs required) used to generate two regulated rails from a common input with PWM current‑mode control and protection features.

Analog Devices, Inc. (ADI) is the manufacturer. It is an American multinational semiconductor company that designs and manufactures analog, mixed-signal, and digital signal processing integrated circuits (including former Linear Technology products now under ADI).

LTC3855EUJ#PBF is a high‑efficiency multiphase buck regulator controller. Typical applications:
- High-current VRMs for CPUs, GPUs, FPGAs, and other ASICs (two/quad phase).
- Server, workstation, data‑center power modules and telecom/network equipment.
- Desktop/Laptop DC‑DC power rails and multi‑rail desktop PSU designs.
- Industrial and medical equipment requiring efficient, multi‑rail DC‑DC conversion.
- Any system needing current sharing and remote sensing in a multiphase buck converter.

The LTC3855EUJ#PBF is packaged in a 28-pin TSSOP (Plastic Small-Outline) package, RoHS lead-free (PBF).