Infineon Technologies IR3552MTRPBF

Overview

IR3552MTRPBF from Infineon Technologies (formerly International Rectifier) is a 40A integrated PowIRstage® power stage combining synchronous buck gate driver, control MOSFET, synchronous MOSFET, and low-side Schottky diode in a single PQFN package. It delivers peak efficiency of 94.5% at 12V_IN/1.8V_OUT, supports 4.5–17V input, 1.5MHz switching, and <1µA disabled bias current - enabling ultra-low-power sleep modes in CPU/GPU VRMs.

For engineers reviewing the IR3552MTRPBF datasheet, IR3552MTRPBF pinout, IR3552MTRPBF application, or IR3552MTRPBF equivalent, key selection criteria include its dual PWM logic mode support (3.3V tri-state or IR Active Tri-Level), VIN_DIV analog monitor output, thermal fault flag (TFAULT), and optimized dual-sided cooling for high-density DC-DC converters.

Technical Context

The IR3552 integrates a low-quiescent-current gate driver with co-packaged power MOSFETs and Schottky diode to minimize conduction and switching losses. Its internal 14:1 VIN_DIV resistor divider enables precise input voltage monitoring without external components, while the bootstrap PFET enhances high-side MOSFET turn-on timing and reduces shoot-through risk.

It features two configurable PWM interfaces: standard 3.3V tri-state logic with defined VIH/VIL thresholds, and IR's proprietary Active Tri-Level (ATL) logic that eliminates body-braking pins and improves load-release transient response. Thermal protection triggers TFAULT at 150°C with 20°C hysteresis, referenced to LGND.

Key Specifications

Pinout & Package

IR3552MTRPBF uses a thermally enhanced 25-pin PQFN package (4 mm × 6 mm × 0.9 mm) with exposed thermal pad on underside for direct PCB copper connection. Power ground (PGND) pads occupy pins 4, 12, 13, and 24; high-current VIN pads are at pins 14–16; SW node spans pins 6–11.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-current integrated power stage applications.

Compared with IR35203MTRPBF and MP87653GQ-Z, the IR3552MTRPBF uniquely combines 40A capacity, VIN_DIV analog monitoring, dual PWM logic support, and TFAULT thermal flag - making it optimal for high-reliability, feature-rich CPU/GPU VRMs where board space and thermal headroom are constrained.

Availability

IR3552MTRPBF is available at Aetrix Electronics and suitable for CPU voltage regulators, GPU power modules, and DDR memory array supplies requiring stable component supply across industrial, enterprise, and embedded computing programs.

Supply support for IR3552MTRPBF 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 PowIRstage® family of integrated power stages for high-efficiency DC-DC conversion.

The IR3552 belongs to Infineon's high-current integrated power stage product line, engineered specifically for demanding point-of-load applications in servers, workstations, and AI accelerators where efficiency, thermal density, and transient response are critical.

FAQ

What PWM logic modes does the IR3552MTRPBF support?

The IR3552MTRPBF supports two distinct PWM input modes: standard 3.3V tri-state logic (VIH = 2.41–2.75V, VIL = 0.75–0.89V) and Infineon's proprietary Active Tri-Level (ATL) logic (VTL = 2.41–2.75V, VTH = 2.21–2.48V, VIL = 0.75–0.89V). Mode selection is controlled by the MODE pin voltage at power-up or EN enable edge, and both modes guarantee minimum 20ns pulse width recognition.

How is thermal protection implemented on the IR3552MTRPBF?

Thermal protection is implemented via the open-drain TFAULT pin, which pulls high to 3.3V when the internal junction temperature exceeds 150°C. The device remains latched in fault state until temperature falls to 130°C (20°C hysteresis). An internal 25kΩ pull-down resistor ensures clean logic-low default state, and the flag can directly drive microcontroller interrupt inputs or external fault-handling circuitry without external components.

Can the IR3552MTRPBF operate without an external bootstrap capacitor?

No - the IR3552MTRPBF requires an external 0.22µF ceramic capacitor between BOOST and SW pins to provide gate charge for the high-side control MOSFET. The internal bootstrap PFET improves charge transfer efficiency but does not eliminate the need for this capacitor. Omitting it causes failure to turn on the high-side FET, resulting in no output voltage regulation and potential device damage under load.

What is the purpose of the VIN_DIV pin, and how is it used in system design?

VIN_DIV provides a buffered, 14:1 scaled analog representation of (VIN − LGND), enabling real-time input voltage monitoring without external resistive dividers. When EN is low, the internal divider disconnects, and the pin enters active pull-down mode for phase-fault signaling. In active operation, VIN_DIV connects directly to an ADC input or comparator, supporting input undervoltage detection, rail health validation, and adaptive loop compensation in closed-loop VRMs.