Infineon Technologies TDA21242AUMA1

Overview

TDA21242AUMA1 from Infineon Technologies is a multichip power stage module integrating a 25 A synchronous buck gate driver, high-side and low-side MOSFETs in a single PG-IQFN-30-2 (4 × 4 × 1 mm³) package. It operates with 4.5–16 V input, supports >500 kHz switching, delivers up to 25 A average output current, and features tri-state PWM compatibility, thermal warning (PHFLT#), and shoot-through protection - deployed in CPU/GPU VRMs on desktop/server motherboards and graphics cards.

For engineers reviewing the TDA21242AUMA1 datasheet, TDA21242AUMA1 pinout, TDA21242AUMA1 application, or TDA21242AUMA1 equivalent, key selection criteria include its 25 A continuous current rating, 5 V gate drive capability for both HS/LS MOSFETs, integrated bootstrap diode, remote disable (EN), and thermal warning functionality with ±10 K accuracy at 140 °C trip point.

Technical Context

The TDA21242AUMA1 implements a monolithic synchronous buck power stage with dedicated AGND and PGND planes, enabling precise separation of control and power return paths. Its gate driver accepts independent VCC (5 V logic supply) and PVCC (5 V gate drive supply), supports tri-state PWM inputs (1.2–2.0 V shutdown window), and incorporates UVLO on BOOT (4.0 V rising / 3.8 V falling) and VCC (4.2 V rising / 3.7 V falling).

It features fast propagation delays (t_pdll = 10 ns turn-on, t_pdlu = 20 ns turn-off), 15 ns tri-state-to-SW response, and robust switching node tolerance (VSW/PHASE: −1 to +25 V DC; AC spikes limited to 322 V for ≤2 ns). Thermal warning (PHFLT#) asserts low at 140 °C with 10 K hysteresis and 37.5–80 Ω pull-down resistance under fault.

Key Specifications

Pinout & Package

Package: PG-IQFN-30-2 (4 mm × 4 mm × 1 mm), RoHS-compliant, thermally enhanced with exposed PGND pad.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP86957GQ-Z and ISL99227BIRZ, the TDA21242AUMA1 uniquely combines 25 A capability, open-drain thermal warning (PHFLT#), tri-state PWM support, and shoot-through protection in a 4×4 mm package-making it optimal for space-constrained, thermally aware CPU/GPU VRMs requiring minimal external components.

Availability

TDA21242AUMA1 is available at Aetrix Electronics and suitable for CPU core regulation, GPU power delivery, DDR memory VRMs, and high-density server VRMs requiring stable component supply, JEDEC-qualified reliability, and thermal-aware power staging.

Supply support for TDA21242AUMA1 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 leadership in silicon carbide and advanced power stage integration.

The TDA21242AUMA1 belongs to Infineon's DrMOS family, designed specifically for high-efficiency, high-frequency, digitally controlled voltage regulator modules targeting next-generation microprocessors and graphics processors.

FAQ

What is the function of the PHFLT# pin and how should it be interfaced?

The PHFLT# pin is an open-drain thermal warning output that pulls low when junction temperature reaches 140 °C ±10 K. It must be externally pulled up to 3.3 V via a resistor (typically 4.7–10 kΩ). No external driver is needed - the pin sinks up to 8 mA and has 37.5–80 Ω on-resistance. Leaving it open disables thermal alerting.

Can the TDA21242AUMA1 operate with a 3.3 V gate drive supply (PVCC)?

No. The TDA21242AUMA1 requires PVCC = 4.5–7 V (typical 5 V) to properly drive both high-side and low-side MOSFETs. At 3.3 V, the internal MOSFETs cannot achieve specified R_DS(on) or switching performance, risking excessive conduction loss and thermal runaway under 25 A load.

How does the tri-state PWM input improve light-load efficiency?

The tri-state PWM input allows the controller to float the PWM line into a high-impedance state (1.2–2.0 V window), forcing the TDA21242AUMA1 to enter discontinuous conduction mode (DCM) with zero-voltage switching. This eliminates reverse recovery losses in the low-side MOSFET and reduces gate drive power, improving efficiency by up to 8% at 10% load compared to forced PWM operation.

Is the TDA21242AUMA1 compatible with digital multi-phase controllers such as IR35201 or ISL68127?

Yes. The TDA21242AUMA1 is explicitly designed for interoperability with Infineon's and third-party digital multi-phase controllers. Its 3.3 V logic-compatible PWM input, 10–20 ns propagation delays, and tri-state support align with IR35201 and ISL68127 timing specifications. Layout guidelines recommend separate AGND and PGND planes with ≥6 vias per PGND pad for optimal noise immunity.