IR3581MTRPBF

IR3581MTRPBF is an 8‑pin PWM controller IC from International Rectifier (now Infineon) used to regulate buck DC‑DC converters. It does not include power MOSFETs; it drives external MOSFETs in a buck topology and uses current‑mode control with soft‑start. Key features typically include adjustable switching frequency, cycle‑by‑cycle current limit, undervoltage lockout, overcurrent/overvoltage protection, and thermal shutdown. It supports both asynchronous and synchronous buck configurations when paired with appropriate MOSFETs and a feedback network. Common applications include VRMs for CPUs/GPUs, telecom power supplies, and other point‑of‑load DC‑DC regulators. The MTRPBF suffix denotes Pb‑free packaging (and reel/tape format). For exact electrical specs, consult the official IR3581 datasheet.

IR3581MTRPBF is a multi‑phase buck regulator controller. There isn’t a direct 1:1 cross. Closest functional equivalents include:
- TI LM5170 or LM5171 multiphase buck regulator controllers
- Analog Devices LTC3896 or LTC3894 multiphase controllers
Note: pinouts, voltage/current specs, and required external FETs differ—check datasheets and reference designs for proper cross-reference and package compatibility.

IR3581MTRPBF is a high‑voltage PWM controller for multiphase buck regulators. Key features (typical; consult datasheet for exact specs):
- Supports multiphase operation (2-phase or more) for CPU-style VRMs
- Voltage-mode control with current-sense feedback
- Programmable switching frequency (up to around 1 MHz) with optional spread-spectrum
- Soft-start with adjustable ramp to limit inrush
- Enable/shutdown input
- UVLO and OVLO protection
- Overcurrent/short-circuit protection (with latch or hiccup behavior)
- Overtemperature protection
- Diagnostics/status options (fault reporting)
- Direct compatibility with external MOSFETs in synchronous buck designs
- Pb-free, MTRPBF package (Tape & Reel)

- Pin count: 16 pins (16-pin package, MTRPBF variant)
- Function: High‑voltage PWM controller for DC‑DC buck regulators (VRMs). Provides control logic to drive external MOSFETs (high-side/low-side) with features such as oscillator, reference and error amplifier, soft-start, enable, current limit, UVLO, and over/under‑voltage and overcurrent protection.

- Manufacturer: Infineon Technologies AG (brand formerly International Rectifier).
- What kind of company: A German multinational semiconductor company specializing in power semiconductors and energy-efficient solutions for automotive, industrial, and consumer markets.

IR3581MTRPBF is a high‑voltage, multi‑phase buck regulator controller. Typical applications include:
- CPU/GPU voltage regulation (VRMs) in desktops and servers
- Motherboard power rails and multi‑phase DC‑DC converters
- Power supplies and intermediate rails in telecom/network equipment
- Embedded and industrial power management requiring efficient DC‑DC conversion
Any high‑efficiency multi‑phase buck regulator design using the IR3581 controller.

IR3581MTRPBF uses the MTRP package: an 8-pin Pb‑free molded tape‑reel package.