IR3578MTRPBF

IR3578MTRPBF is a high-performance multiphase synchronous buck controller from Infineon (formerly IR) used to regulate CPU core and other high‑current VRMs. It drives external N‑channel MOSFETs in a multi‑phase configuration, enabling current sharing and phase shedding for fast transients and good light‑load efficiency. Features typically include current‑mode PWM with programmable switching frequency, soft‑start/soft‑stop, and protections such as undervoltage lockout, overcurrent, overvoltage, and thermal shutdown, plus fault reporting. It requires external MOSFETs and an external compensation network (no integrated power MOSFETs). Packaging MTRPBF denotes Pb‑free, RoHS‑compliant packaging. Common applications are CPU/GPU power rails in servers, workstations, and similar high‑current VRM designs.

Equivalent products (closest cross) for IR3578MTRPBF are other multi-phase VRM controllers. Not a drop-in replacement; verify specs. Examples include:
- TI LM5170/LM5170A
- Analog Devices LTC3896/LTC3897
- Renesas ISL95858
- ON Semiconductor NCP81239

Here are the key features of IR3578MTRPBF (datasheet highlights):
- Multi-phase, synchronous buck controller for VRMs (drives external MOSFETs; supports phase interleaving and current sharing)
- Wide input range suitable for CPU/GPU VRM rails; supports high-efficiency operation
- Programmable switching frequency (up to around 1 MHz) with options for spread-spectrum
- Precise voltage regulation via feedback with remote sensing and droop compensation
- Output voltage adjustable via VID/feedback; programmable soft-start and tracking
- Protection: cycle-by-cycle current limit (OCP), overvoltage (OVP), undervoltage (UVLO), and thermal/overtemperature protection with latch
- Fault reporting and enable/disable control; status/diagnostic features
- Gate-drive capability for multiple phases with robust gate drive timing
- Pb-free packaging in MTRPBF (tape-and-reel)
Applications: CPU/GPU VRMs, high-performance servers/workstations.

Manufacturer: International Rectifier (IR) — the IR3578MTRPBF is an IR part; International Rectifier is now part of Infineon Technologies.
What kind of company: International Rectifier (now under Infineon) is a semiconductor company specializing in power-management products — power MOSFETs, power ICs, voltage regulators, drivers and integrated power-conversion solutions for automotive, industrial, computing and consumer applications.

IR3578MTRPBF is a high‑current, multi‑phase buck regulator controller. Typical applications:
- Desktop/server motherboard VRMs (CPU/GPU/FPGA/ASIC cores)
- Graphics cards and high‑end workstations
- Telecom and data‑center power supplies requiring high efficiency and fast transient response
- Any multi‑phase DC‑DC regulator needing tight voltage control
It is used with external MOSFETs/drivers to form multi‑phase converters delivering stable, high‑current rails.

QFN package (32-pin) with exposed thermal pad; Pb-free (MTRPBF).