Infineon Technologies TDA21241AUMA1

Overview

TDA21241AUMA1 from Infineon is a multichip power stage module integrating a 25 V high-side and low-side MOSFET pair with a high-frequency gate driver in a single PG-IQFN-30-2 (4 × 4 × 1 mm³) package. It delivers up to 35 A average output current, supports 4.5–16 V input, operates up to 1 MHz PWM 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 TDA21241AUMA1 datasheet, TDA21241AUMA1 pinout, TDA21241AUMA1 application in synchronous buck POL regulation, or TDA21241AUMA1 equivalent for high-density VRM design, this page provides verified pin functions, thermal warning behavior, gate drive voltage requirements (VCC = 4.5–7 V, PVCC = 4.5–7 V), and real-world switching timing (t_pdll = 10 ns, t_pdlu = 20 ns).

Technical Context

The TDA21241AUMA1 implements a monolithic synchronous buck power stage with integrated bootstrap diode, UVLO on BOOT and VCC rails, and independent AGND/PGND separation for noise isolation. Its gate driver accepts 3.3 V logic-level PWM and EN signals, drives both MOSFETs with +5 V gate voltage, and includes internal shoot-through prevention logic that enforces dead-time between HS and LS transitions.

Thermal warning is implemented via the open-drain PHFLT# pin, pulled low at 140 °C junction temperature with ±10 K accuracy and 10 K hysteresis. The module's optimized layout minimizes parasitic inductance - critical for >500 kHz operation - and achieves ~60 W power density within 16 mm² footprint.

Key Specifications

Pinout & Package

Package: PG-IQFN-30-2 (4 mm × 4 mm × 1 mm), thermally enhanced with exposed PGND pad and dual ground systems (AGND for logic, PGND for power).

Key Features

Applications

Equivalent & Alternatives

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

Compared with IR35201MTRPBF and MP87653GQH-P, the TDA21241AUMA1 uniquely combines integrated bootstrap diode, PHFLT# thermal telemetry, and tri-state PWM in a 4 × 4 mm package - making it optimal for space-constrained, thermally managed multi-phase VRMs in servers and high-end graphics.

Availability

TDA21241AUMA1 is available at Aetrix Electronics and suitable for desktop CPU VRMs, server GPU power stages, notebook DDR5 regulators, and industrial DC-DC VR modules requiring stable component supply across extended product lifecycles.

Supply support for TDA21241AUMA1 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 and GaN power devices.

The TDA21241AUMA1 belongs to Infineon's DrMOS family - engineered specifically for high-efficiency, high-density point-of-load regulation in advanced microprocessor and GPU power delivery systems.

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 requires an external 3.3 V pull-up resistor (typically 10 kΩ). When asserted, it signals impending thermal shutdown, enabling system-level actions like fan speed increase or clock throttling - but does not disable the device automatically.

Can TDA21241AUMA1 operate with a 3.3 V gate drive voltage instead of 5 V?

No - the internal MOSFETs are optimized for 5 V gate drive (PVCC = 4.5–7 V). Using 3.3 V would significantly increase R_DS(on), causing excessive conduction losses and thermal stress. The datasheet specifies +5 V HS/LS gate drive as mandatory for rated 35 A performance and efficiency.

How is shoot-through protection implemented, and can it be disabled?

Shoot-through protection is hardwired logic inside the gate driver that enforces minimum dead-time between HS turn-off and LS turn-on (and vice versa). It cannot be disabled or adjusted - this hardware safeguard prevents destructive current flow during switching transitions under all operating conditions.

What is the recommended PCB layout practice for AGND and PGND connections?

AGND (pins 1, 5) and PGND (pins 4, 13–15, 28, and exposed pad) must be connected externally using multiple low-inductance vias to separate ground planes. AGND serves the logic circuitry and must be isolated from high di/dt PGND currents; mixing them degrades UVLO stability and increases PWM jitter.