LTM4651IY#PBF

The LTM4651IY#PBF is Analog Devices’ compact µModule buck regulator in a lead-free package. It’s a high‑current, nonisolated dc–dc converter that integrates the power MOSFETs, controller, and essential passives into a single module to deliver regulated rails for CPUs, GPUs, FPGAs, and other demanding loads. The IY suffix denotes the packaging variant; PBF indicates Pb‑free (RoHS compliant). Key features typically include multi‑phase capability for high current and fast transient response, adjustable output voltages, remote sense, and robust protections (overcurrent, overvoltage, overtemperature, input UVLO). The module is designed to simplify board layout and reduce BOM by providing a complete power solution in one package, suitable for point‑of‑load use in servers, telecom, and high‑end computing. For exact electrical specs (input range, output voltage/current, switching frequency), programming/interface details, and pinout, consult the LTM4651 datasheet and product page.

Here are the key features of LTM4651IY#PBF (Analog Devices Linear Technology):
- Highly integrated µModule DC-DC regulator with integrated MOSFETs and inductor
- PMBus-compatible digital interface for programming, monitoring, sequencing, and margins
- Multi-output/dual-rail capability with independent regulation and tracking
- Remote sense for accurate output regulation
- High efficiency via synchronous rectification
- Programmable output voltages and sequencing/QoS control
- Protection features: overcurrent/OC, overvoltage/OVP, undervoltage/UVLO, short-circuit protection, and thermal shutdown
- Fault reporting and telemetry accessible over PMBus
- Wide operating range suitable for high-density VRMs in FPGAs, CPUs, GPUs, and automotive/industrial systems
- Pb-free, RoHS compliant (PBF) package
Note: Exact output count, voltage ranges, and footprint depend on the specific revision; please refer to the datasheet for complete specifications.

- Pin count: 28 pins (28‑pin LQFP package)
- Function: PMBus-enabled digital power controller for a multi-output buck regulator (controls/monitors a multiphase/multi-output DC‑DC converter; external MOSFETs required).

Manufacturer: Linear Technology (now part of Analog Devices).
What kind of company: Linear Technology is/was a semiconductor company that designs and sells analog and mixed‑signal integrated circuits and complete power‑management modules (µModule regulators), serving industrial, communications, computing, and automotive markets.

Applications for the LTM4651IY#PBF (a high‑current multi‑rail µModule DC‑DC regulator) include:
- Point‑of‑load regulation for CPUs/GPUs/FPGA cores and I/O rails
- Power for servers, data centers, storage, and high‑end networking equipment
- Telecom and network infrastructure (switches, routers, base stations)
- Industrial automation, motor drives, and rugged embedded systems
- Medical equipment requiring compact, efficient, low‑noise power
These modules are ideal where multiple tightly regulated rails in a small, efficient package are needed.

LTM4651IY#PBF comes in a 16‑lead LQFN (4×4 mm) package, Pb‑free/RoHS compliant.