Infineon Technologies TDA21231AUMA1

Overview

TDA21231AUMA1 from Infineon is a DrMOS power stage IC integrating high-side and low-side 25 V MOSFETs with a high-frequency gate driver in a single PG-IQFN-31-2 (5 × 5 × 0.8 mm³) package. It delivers up to 55 A average output current, supports 4.5–16 V input, operates up to 1.2 MHz switching frequency, and features tri-state PWM input, thermal warning (PHFLT#), and shoot-through protection - deployed in CPU/GPU VRMs on desktop/server motherboards and graphics cards.

For engineers reviewing the TDA21231AUMA1 datasheet, TDA21231AUMA1 pinout, TDA21231AUMA1 application in high-density POL converters, or TDA21231AUMA1 equivalent for synchronous buck power stages, this page provides verified pin functions, thermal warning behavior, bootstrap diode integration, UVLO thresholds, and gate drive voltage compatibility with +3.3 V PWM controllers.

Technical Context

The TDA21231AUMA1 implements a monolithic multichip module architecture combining discrete silicon MOSFETs and an integrated gate driver with optimized dead-time control. Its BOOT, PHASE, GH, GL, and SW pins form a tightly coupled switching node interface enabling <2 ns propagation delay asymmetry and <10 ns shoot-through immunity.

It operates under dual supply rails: PVCC (4.5–7 V) powers both MOSFET gates, while VCC (4.5–7 V) supplies internal logic and PWM interface circuitry. The EN pin enables active-high control with 0.8 V low / 2.0 V high thresholds, and PHFLT# asserts open-drain low at 140 °C ±10 K with 10 K hysteresis.

Key Specifications

Pinout & Package

Package: PG-IQFN-31-2 (5 mm × 5 mm × 0.8 mm), exposed thermal pad (PGND-connected), RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar DrMOS power stage applications.

Compared with IR35204, TDA21231AUMA1 delivers 37.5% higher current density and eliminates external bootstrap components; versus TDA21472, it trades 15 A headroom for proven qualification in volume desktop/server platforms and lower gate charge at 55 A loads.

Availability

TDA21231AUMA1 is available at Aetrix Electronics and suitable for desktop CPU VRMs, server GPU power stages, and DDR5 memory regulators requiring stable component supply, long-term lifecycle support, and traceable sourcing for high-volume production.

Supply support for TDA21231AUMA1 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 global R&D and wafer fabrication facilities.

The TDA21231AUMA1 belongs to Infineon's DrMOS product line - engineered specifically for high-efficiency, high-frequency synchronous buck conversion in CPU/GPU core voltage regulation and point-of-load applications.

FAQ

What is the recommended layout for the BOOT and PHASE pins?

Connect a 0.1 µF ceramic capacitor between BOOT and PHASE pins with minimal trace length (<2 mm) and direct placement adjacent to the IC. Use separate low-inductance vias from PHASE pads to inner-layer PGND planes to avoid coupling noise into the bootstrap loop. Avoid routing sensitive analog traces near these nodes.

Does TDA21231AUMA1 require an external bootstrap diode?

No. The TDA21231AUMA1 integrates a bootstrap diode internally, eliminating the need for an external component. This reduces BOM count, layout complexity, and parasitic inductance in the high-side gate drive path - confirmed in Section 2 "Features" and Figure 3 block diagram of the datasheet.

How does the PHFLT# pin behave during thermal warning?

PHFLT# is an open-drain output that pulls low when junction temperature reaches 140 °C ±10 K. It remains low until temperature drops below 130 °C (10 K hysteresis). An external 10 kΩ pull-up to 3.3 V is required; the pin sinks ≤8 mA when asserted, enabling direct connection to microcontroller GPIO interrupt pins.

Can TDA21231AUMA1 operate with a 3.3 V-only supply (no 5 V rail)?

Yes. Both VCC and PVCC accept 4.5–7 V, but operation at 3.3 V is not supported. The minimum specified VCC and PVCC is 4.5 V (Table 8). Using 3.3 V violates absolute maximum ratings and risks UVLO lockout or unstable gate drive - confirmed in Table 9 (VUVLO_R = 4.2 V, VUVLO_F = 3.7 V).