IR3447MTRPBF

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IR3447MTRPBF

+BOM

IC REG BUCK ADJUSTABLE 25A PQFN

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Specifications

Attribute Value
Package / Case Tape & Reel (TR),Cut Tape (CT)
Series SupIRBuck®
Part Status Obsolete
Function Step-Down
Output Configuration Positive
Topology Buck
Output Type Adjustable
Number of Outputs 1
Voltage - Input (Min) 5V
Voltage - Input (Max) 21V
Voltage - Output (Min/Fixed) 0.6V
Voltage - Output (Max) 18.06V
Current - Output 25A
Frequency - Switching 300kHz ~ 1.5MHz
Synchronous Rectifier Yes
Operating Temperature -40°C ~ 125°C (TJ)
Mounting Type Surface Mount

Overview

Description

IR3447MTRPBF is an off-line switch‑mode power-supply controller from International Rectifier (now Infineon). The MTRPBF suffix indicates the M‑package variant, Tape-and-Reel packaging, Pb‑free.
用途: designed for flyback/off-line SMPS and LED drivers, providing primary‑side PWM control for a power MOSFET driven from the high-voltage rail.
Key features (typical): high-voltage start‑up/bias, current‑mode control, protection functions (overcurrent/short‑circuit, overvoltage, undervoltage lockout), thermal shutdown, and soft‑start. It supports primary‑side regulation in opto‑isolator–free designs and requires an external MOSFET plus standard sense and bias components per application.
Common applications: AC adapters, wall‑wart supplies, TV/monitor power supplies, and LED driver circuits.

Features

IR3447MTRPBF features (concise):
- PWM controller for VRM/buck applications using current-mode control
- Wide input/bias range suitable for VRM environments
- Programmable switching frequency with slope compensation
- Soft-start to limit inrush and stabilize regulation
- External sense options: current sense and voltage feedback for regulation
- Fault protections: overcurrent/short-circuit, overvoltage, undervoltage lockout
- Over-temperature protection with safe shutdown
- Enable/shutdown control and fault reporting
- Low quiescent current when disabled
- Pb-free MTRPBF package for surface-mount assembly
Note: exact electrical specs (voltage ranges, frequency range, sense pin details) are in the datasheet; confirm for your design requirements.

Pinout

- Pin count: 28 pins (28-pin package)
- Function: IR3447MTRPBF is a PWM controller for VRM/multi‑phase buck converters. It provides voltage regulation for CPU/GPU cores by controlling external MOSFETs, with feedback, oscillator, soft-start, and protections (OC/OV/UV, etc.).

Manufacturer

Manufacturer: Infineon Technologies AG (the IR prefix comes from International Rectifier, which Infineon acquired in 2015).
What kind of company: a German multinational semiconductor company that designs and manufactures power electronics, automotive, industrial, and security semiconductor solutions.

Application

IR3447MTRPBF is a primary-side PWM controller used in switch‑mode power supplies. Typical application areas include:
- Offline AC‑DC power supplies (flyback/buck configurations) and adapters
- LED lighting drivers (constant-current regulation)
- Telecom/consumer electronics power modules and auxiliary supplies
- DC‑DC converters in computers, set‑top boxes, routers, and embedded systems
Note: It’s designed for high-efficiency SMPS applications and primary-side regulation.

Package

8-pin surface-mount package (SO-8), Pb-free. Tape-and-Reel (TR) packaging.

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