Infineon Technologies IR3827MTRPBF

Overview

IR3827MTRPBF from Infineon Technologies (formerly International Rectifier) is a highly integrated synchronous buck regulator with integrated high- and low-side MOSFETs, PWM controller, bootstrap diode, and internal 5.1V/6.9V LDO. It delivers up to 6A output current, supports input voltage range of 5V–21V (or 1.0V–21V with external VCC bias), provides 0.6V ±0.6% reference accuracy, and operates at programmable switching frequencies from 300kHz to 1.2MHz. It is used in point-of-load power delivery for computing and data center applications.

For engineers reviewing the IR3827MTRPBF datasheet, IR3827MTRPBF pinout, IR3827MTRPBF application, or IR3827MTRPBF equivalent, key selection considerations include its thermally compensated current limit, monotonic pre-bias start-up, open-drain PGood signaling, three selectable soft-start times, and support for external clock synchronization in compact 4mm × 5mm PQFN packaging.

Technical Context

The IR3827 implements a voltage-mode PWM control architecture with feedforward compensation for enhanced line regulation. Its error amplifier features 100–120 dB DC gain, 20–40 MHz GBWP, and ±3% input offset - enabling precise output voltage regulation under dynamic load transients.

It integrates dual MOSFET drivers with 10 ns dead time, boot capacitor management, and thermal shutdown with 125°C junction limit. The device supports ratiometric sequencing via the Seq pin and offers dual LDO output options (5.1V or 6.9V) selected by LDO_Select logic level.

Key Specifications

Pinout & Package

IR3827MTRPBF is housed in a thermally enhanced 4 mm × 5 mm PQFN package with exposed thermal pad (pin 11 = PGnd). The 17-pin layout separates signal ground (pins 4, 17), power ground (pin 11), and high-current paths (PVin, SW, Boot) to minimize noise coupling and improve thermal dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP8765GQ-Z and TPS546B24RVFT, IR3827MTRPBF uniquely balances integration (integrated LDO, boot diode, drivers), analog flexibility (Rt-programmable f_SW, 3 soft-start options), and thermal performance in a 4×5 mm footprint - making it optimal for cost-sensitive, high-reliability analog POL designs without digital control overhead.

Availability

IR3827MTRPBF is available at Aetrix Electronics and suitable for server CPU core supplies, network switch ASIC rails, and storage controller SoC power delivery requiring stable component supply and long-term industrial availability.

Supply support for IR3827MTRPBF 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 global semiconductor leader specializing in power management, automotive, and industrial control ICs, with deep expertise in high-efficiency power conversion and robust thermal design.

The SupIRBuck™ product line - including IR3827MTRPBF - was engineered for high-density, high-reliability point-of-load regulation in computing and data center infrastructure, emphasizing integration, thermal resilience, and analog control precision.

FAQ

What is the maximum allowable input voltage for PVin when operating with internal LDO enabled?

The absolute maximum rating for PVin to PGnd is 25 V, but the recommended operating condition with internal LDO active is 5.5–21 V. Exceeding 21 V risks violating the 7.5 V Vcc limit and may trigger overvoltage protection or damage the internal LDO. For 24 V input systems, external VCC bias is required.

How does the SS_Select pin affect soft-start behavior, and what are the exact timing values?

SS_Select sets soft-start duration: logic high (Vcc) = 1.5 ms, floating = 3 ms, grounded = 6 ms. These durations correspond to fixed ramp rates of 0.4, 0.2, and 0.1 mV/µs respectively applied to the error amplifier's reference input, ensuring monotonic output rise without overshoot or reverse current.

Can IR3827MTRPBF be used without the internal LDO, and how is external bias applied?

Yes - bypass the internal LDO by connecting Vin directly to Vcc/LDO_Out and supplying 4.5–7.5 V externally. This configuration disables the LDO, reduces quiescent current, and allows operation down to 1.0 V PVin. The Vcc pin must be decoupled with ≥2.2 µF ceramic capacitance to PGnd.

What is the purpose of the Seq pin, and how is it implemented in multi-rail systems?

The Seq pin enables ratiometric or simultaneous power sequencing by accepting a voltage divider from a master rail. When the divided voltage crosses ~0.3 V, the IR3827 initiates soft-start. This allows precise turn-on alignment with upstream regulators - critical for FPGAs, SoCs, and memory interfaces requiring strict voltage ordering.