Infineon Technologies IR3827MTR1PBF

Overview

IR3827MTR1PBF from Infineon Technologies (formerly International Rectifier) is a highly integrated synchronous buck regulator with integrated MOSFET drivers, bootstrap diode, and internal 5.1V/6.9V LDO. It delivers up to 6A output current, supports 1.0–21V input range (with external VCC bias), regulates output from 0.6V ±0.6% reference, and operates at programmable switching frequencies up to 1.2MHz. It is used in point-of-load power delivery for computing and data center applications requiring monotonic start-up and pre-bias support.

For engineers reviewing the IR3827MTR1PBF datasheet, IR3827MTR1PBF pinout, IR3827MTR1PBF application, or IR3827MTR1PBF equivalent, key selection criteria include its thermally compensated current limit, open-drain PGood indication, three soft-start options, feedforward-enhanced line/load regulation, and PQFN 4mm × 5mm package thermal performance (θ_j-PCB = 2°C/W).

Technical Context

The IR3827 implements a voltage-mode PWM controller with internal error amplifier (GBWP = 20–40 MHz, DC gain = 100–120 dB), precision 0.6V reference (±0.6% over 0–70°C), and ramp-based slope compensation. Its control loop accepts feedback via Fb pin and compensates via external RC network on Comp pin.

It integrates high-side and low-side MOSFET drivers with dead time of 10 ns, bootstrap circuitry (100nF Boot–SW capacitor), and dual-path power inputs: PVin powers the power stage, while Vin/Vcc/LDO_Out supplies the controller and LDO. Sequencing (Seq pin), synchronization (Rt/Sync), and enable-based UVLO are implemented with dedicated pins and internal comparators.

Key Specifications

Pinout & Package

IR3827MTR1PBF 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 optimize 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 TPS546B24A, IR3827MTR1PBF uniquely combines integrated bootstrap diode, selectable LDO output, and hardware-based sequencing in a 4×5 mm PQFN - offering optimal balance of integration, thermal performance, and analog control simplicity for mid-power POL designs.

Availability

IR3827MTR1PBF is available at Aetrix Electronics and suitable for computing applications, data center point-of-load architectures, and storage controller power delivery requiring stable component supply and long-term industrial availability.

Supply support for IR3827MTR1PBF 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 acquired International Rectifier in 2015 and continues to develop and support its high-performance power management portfolio, including SupIRBuck™ regulators.

The IR3827 belongs to the SupIRBuck™ family - designed specifically for space-constrained, high-efficiency point-of-load applications in computing, networking, and storage systems where integration, thermal performance, and robust protection are critical.

FAQ

What is the recommended input capacitor for IR3827MTR1PBF?

A minimum 22 µF X5R/X7R ceramic capacitor with ≤5 mΩ ESR is recommended at the PVin pin, placed as close as possible to Pins 13 and 14. For systems with high input ripple or long traces, add a 100 µF low-ESR aluminum polymer capacitor in parallel to handle bulk energy and reduce stress on ceramics.

How does the LDO_Select pin affect MOSFET R_DS(on)?

LDO_Select = GND configures the internal LDO to 6.9 V, reducing top-switch R_DS(on) to 16–22 mΩ (typ.) at 6.9 V gate drive; LDO_Select = float sets LDO to 5.1 V, resulting in 21–29 mΩ. Higher gate voltage lowers conduction loss but increases shoot-through risk during dead time - select based on efficiency vs. reliability trade-off.

Can IR3827MTR1PBF operate without an external VCC supply?

Yes - it can self-bias using the internal LDO powered from PVin. Connect Vin (Pin 9) to PVin (Pin 13) and ensure PVin ≥ 5.5 V. Below 5.5 V, an external 4.5–7.5 V VCC source must be applied to Vcc/LDO_Out (Pin 10) to maintain regulation and driver functionality.

What is the purpose of the Seq pin, and how is it configured?

The Seq pin enables hardware-based power sequencing by accepting a voltage divider from a master rail. When the divided voltage crosses ~0.3 V, the IR3827 initiates soft-start. For ratiometric tracking, tie Seq to the same divider used for the master regulator's feedback - ensuring proportional ramp rates across rails.