International Test Instruments Corporation IR3623MTRPBF

Overview

IR3623MTRPBF from Infineon Technologies is a high-frequency, 2-phase synchronous buck PWM controller configurable for dual independent outputs or current-sharing single output. It supports ratiometric/simultaneous voltage tracking and sequencing, features 180° out-of-phase operation (reducing input/output capacitance), programmable switching frequency up to 1200 kHz per phase, and MOSFET R_DS(on)-based hiccup current limiting. Used in graphics card VRMs and telecom point-of-load systems.

For engineers reviewing the IR3623MTRPBF datasheet, IR3623MTRPBF pinout, IR3623MTRPBF application, or IR3623MTRPBF equivalent, key selection criteria include dual soft-start programmability, independent power-good outputs, V_REF accuracy of ±1%, external clock synchronization capability, and thermal shutdown with 20°C hysteresis.

Technical Context

The IR3623MTRPBF implements two independent error amplifiers with transconductance of 2800–4400 µmho and dedicated feedback (FB1/FB2), sense (VSEN1/VSEN2), and compensation (Comp1/Comp2) pins per channel. Its phase enable (Ph_En1/Ph_En2) and track/seq logic support precise power-up/down sequencing across multiple rails.

It uses internal 5V regulator (VOUT3) for biasing, supports pre-bias start-up, and employs R_DS(on) sensing via OCSet1/OCSet2 pins for overcurrent protection with hiccup mode (15% duty cycle). OVP detection triggers latched fault on OVP_Output with 5 µs propagation delay relative to 1.125×V_REF.

Key Specifications

Pinout & Package

IR3623MTRPBF is housed in a thermally enhanced 32-lead MLPQ package with exposed thermal pad (Θ_JA = 36°C/W, Θ_JC = 1°C/W) requiring 4-layer PCB layout with vias to inner copper planes.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck controller applications.

Compared with ISL6269CRZ-T and TPS546D24RTQR, the IR3623MTRPBF offers superior analog sequencing control and external frequency flexibility but requires discrete gate drivers-making it optimal for high-efficiency, thermally constrained PoL designs where digital overhead is unnecessary.

Availability

IR3623MTRPBF is available at Aetrix Electronics and suitable for graphics card VRMs, telecom point-of-load converters, and server CPU voltage regulators requiring stable component supply, long-term lifecycle support, and consistent parametric performance across temperature.

Supply support for IR3623MTRPBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Infineon Technologies is a German semiconductor manufacturer specializing in power management, automotive, and industrial control ICs, with leadership in high-efficiency DC/DC conversion solutions.

The IR3623 belongs to Infineon's high-performance analog power controller product line, designed specifically for multi-rail, high-density point-of-load applications demanding precise sequencing, low noise, and thermal resilience.

FAQ

What is the function of the Seq pin on IR3623MTRPBF?

The Seq pin enables or disables the tracking and sequencing logic. When pulled high, it activates ratiometric or simultaneous power-up/down behavior controlled by Track1/Track2. When grounded or left floating, sequencing is disabled and outputs operate independently. It does not affect soft-start or overcurrent functions.

Can IR3623MTRPBF be used without external MOSFET drivers?

No-it is a controller-only IC with PWM1/PWM2 gate drive outputs rated for 10 mA sink/source. External high-current gate drivers (e.g., IR2110, UCC27531) or iPOWIR™ integrated power stages (e.g., iP2005) must be used to drive power MOSFETs. The absence of integrated drivers allows optimization for high-efficiency, high-current designs.

How does the IR3623MTRPBF implement overvoltage protection?

OVP is implemented via dedicated VSEN1/VSEN2 pins monitoring output voltage directly. When sensed voltage exceeds 1.10–1.20 × V_REF, OVP_Output goes high and latches until the Enable pin is toggled. Propagation delay is 5 µs, and the fault signal can drive external shutdown circuitry or status LEDs without additional logic.

What is the role of the OCGnd pin?

OCGnd is a dedicated analog ground reference for the overcurrent sensing circuitry. It must be connected to the source of the low-side MOSFET being sensed-not to the main GND or SGnd-to ensure accurate R_DS(on) current measurement and prevent noise coupling into the OCSet comparator path.