Infineon Technologies IR3823MTRPBF

Overview

IR3823MTRPBF from Infineon Technologies (formerly International Rectifier) is a 3A synchronous buck regulator with integrated MOSFET drivers, voltage-mode control, and internal LDO. It operates from 5V–21V input (or 1.0V–21V with external VCC bias), delivers 0.6V–0.86×PVin output, supports up to 1.5MHz switching frequency, and features open-drain PGood, thermal shutdown, and hiccup-mode overcurrent protection - deployed in point-of-load power delivery for server VRMs and telecom POL modules.

For engineers reviewing the IR3823MTRPBF datasheet, IR3823MTRPBF pinout, IR3823MTRPBF application, or IR3823MTRPBF equivalent, key selection criteria include its programmable soft-start options (1.5/3/6ms), thermally compensated current limit, feedforward-enhanced line/load regulation, and PQFN-16 package thermal resistance (θj-PCB = 10.1°C/W) for high-density DC/DC designs.

Technical Context

The IR3823 employs a proprietary voltage-mode PWM modulator with 20–40 MHz gain-bandwidth product and 7–20 V/µs slew rate, enabling fast transient response with minimal output capacitance. Its error amplifier provides 100–120 dB DC gain and rail-to-rail output swing (100 mV to 2.3 V), supporting precise loop compensation via external RC network between COMP and FB pins.

Switching is controlled by an adjustable oscillator (Rt/Sync pin), supporting resistor-set frequencies from 270–1650 kHz or synchronization to external clocks (270–1650 kHz). The internal 5.1 V LDO powers gate drivers and logic; boot capacitor (100 nF) enables high-side N-channel MOSFET drive, while PGnd and Gnd are separated for noise isolation in high-current paths.

Key Specifications

Pinout & Package

IR3823MTRPBF is housed in a thermally enhanced 3.5 mm × 3.5 mm, 16-pin PQFN package with exposed thermal pad (PGnd-connected) and dual ground separation (analog Gnd and power PGnd) for noise immunity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP2315DJ-LF-Z and TPS54332DDAR, IR3823MTRPBF uniquely integrates boot diode, offers three soft-start options without external components, and delivers superior thermal performance (θj-PCB = 10.1°C/W) in its 3.5 mm × 3.5 mm PQFN - making it optimal for thermally constrained, high-reliability POL deployments.

Availability

IR3823MTRPBF is available at Aetrix Electronics and suitable for server VRM core supplies, telecom line card POLs, storage controller power, and set-top box SoC supplies requiring stable component supply, long-term lifecycle support, and RoHS6-compliant packaging.

Supply support for IR3823MTRPBF 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 DC/DC conversion and silicon power stages.

The SupIRBuck® product line - including IR3823MTRPBF - was designed specifically for high-density, high-efficiency point-of-load regulation in computing, telecom, and storage infrastructure, integrating drivers, protection, and thermal optimization into compact packages.

FAQ

What is the minimum input voltage required for IR3823MTRPBF to operate using its internal LDO?

The IR3823MTRPBF requires a minimum 5.5 V on Vin and PVin simultaneously when using the internal LDO. Below this, the internal 5.1 V LDO cannot regulate properly, risking unstable gate drive and erratic switching. For inputs below 5.5 V, an external 4.5–7.5 V bias must be applied to Vcc/LDO_Out, and Vin must be shorted to Vcc per datasheet Note 5.

How does the SS_Select pin affect soft-start behavior, and what are the practical implications?

SS_Select configures soft-start duration: tied to Vcc yields 1.5 ms, left floating gives 3 ms, and grounded selects 6 ms. This directly controls output voltage ramp rate (0.085–0.46 mV/µs), preventing inrush into large output capacitors or pre-biased rails. In multi-rail systems, selecting longer ramps avoids current surges that could trip upstream current limits.

Can IR3823MTRPBF synchronize to an external clock, and what are the signal requirements?

Yes - the Rt/Sync pin accepts external clock signals from 270 kHz to 1650 kHz. The sync pulse must have 100–200 ns duration, high threshold ≥3.0 V, low threshold ≤0.6 V, and be AC-coupled via a Schottky diode to avoid disturbing the internal oscillator resistor network. This enables precise phase alignment in multi-phase POL systems to minimize input ripple.

What is the role of the separate PGnd and Gnd pins, and how should they be routed on the PCB?

PGnd carries high di/dt return currents from the power stage (SW, PVin, Boot), while Gnd serves analog circuitry (FB, COMP, VREF). They must be connected only at a single point near the IC's thermal pad to prevent noise coupling. PCB layout requires separate copper pours: PGnd under the power section, Gnd under control section, joined at the exposed pad - ensuring <10 mΩ impedance path to minimize regulation error.