Infineon Technologies TDA21570AUMA1

Overview

TDA21570AUMA1 from Infineon is a 70 A integrated power-stage IC for high-frequency synchronous buck DC-DC conversion, serving as the core voltage regulator for CPU/GPU/DDR memory rails. It integrates a low-quiescent-current gate driver, control MOSFET (Q1), synchronous MOSFET (Q2), and active diode structure with 5 µA/A current sensing accuracy, 0.225–5.5 V output range, and 1.5 MHz switching capability.

For engineers reviewing the TDA21570AUMA1 datasheet, TDA21570AUMA1 pinout, TDA21570AUMA1 application in CPU VRMs or DDR memory regulation, or TDA21570AUMA1 equivalent for high-current power stages, this page delivers verified electrical parameters, thermal behavior, fault reporting architecture, and layout-critical pin functions aligned with Infineon's OptiMOS™ PowerStage design intent.

Technical Context

The TDA21570AUMA1 implements a monolithic synchronous buck power stage with co-packaged gate driver, Q1 (control MOSFET), and Q2 (synchronous MOSFET), enabling precise timing alignment and minimized switch-node ringing. Its active diode structure achieves Schottky-like V_SD with negligible reverse recovery charge, directly improving light-load efficiency and transient response.

Current sensing is performed on-chip via MOSFET R_DS(on) monitoring, delivering 5 µA/A analog IMON output referenced to IMONREF (1.1–1.9 V), eliminating external DCR sensing components. Fault detection includes cycle-by-cycle OCP, HSS (high-side short), bootstrap UVLO, and thermal shutdown with 8 mV/°C analog TMON output calibrated to 0.6 V + 8 mV/°C × T_J.

Key Specifications

Pinout & Package

Delivered in a lead-free, RoHS-compliant 5 mm × 6 mm × 0.9 mm PQFN package with dual-exposed thermal pads (PGND and AGND) for enhanced PCB heat transfer and EMI control. Pin numbering follows transparent top-view orientation per Infineon Rev 2.0 documentation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ISL99390HRZ-T and MP87653GQZ, the TDA21570AUMA1 delivers superior current-sense fidelity (5 µA/A), true analog thermal telemetry (8 mV/°C), and an active diode structure that improves efficiency below 10% load-critical for modern CPU/GPU DVFS and burst-mode AI workloads.

Availability

TDA21570AUMA1 is available at Aetrix Electronics and suitable for CPU voltage regulation, GPU memory rail design, and DDR5 server memory modules requiring stable component supply, long-term lifecycle assurance, and traceable sourcing from authorized channels.

Supply support for TDA21570AUMA1 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 MCUs, and industrial control ICs, with leadership in silicon carbide and advanced power-stage integration.

The TDA21570AUMA1 belongs to Infineon's OptiMOS™ PowerStage product line, engineered specifically for high-efficiency, high-density VRMs in datacenter CPUs, GPUs, and AI accelerators where thermal performance, analog telemetry, and transient response are design-critical.

FAQ

What is the recommended bootstrap capacitor value and placement for TDA21570AUMA1?

A 0.47 µF X7R ceramic capacitor is recommended between BOOT (pin 33) and PHASE (pin 32). For VIN >13.2 V, a 2 Ω resistor must be placed in series with the capacitor to dampen ringing and meet EMI requirements. The capacitor must be placed as close as possible to the pins with minimal trace length to avoid voltage droop during high di/dt switching events.

How does the TDA21570AUMA1 achieve Body-Braking™ functionality?

Body-Braking™ is implemented by rapidly turning on the synchronous MOSFET (Q2) during load-step-down transients, allowing it to actively sink current from the output capacitor back into the input rail. This prevents output voltage overshoot and maintains regulation within ±15 mV even during 50 A/µs load dumps, without requiring external circuitry or controller intervention.

Can the IMON/IMONREF interface be used for closed-loop current limiting?

Yes - the IMON pin delivers a 5 µA/A proportional current signal referenced to IMONREF (1.1–1.9 V). By placing a precision resistor (e.g., 1 kΩ for 5 mV/A) between IMON and IMONREF, the resulting voltage can be fed to a controller's analog current-limit comparator, enabling hardware-based cycle-by-cycle current limiting independent of digital communication latency.

What thermal derating guidance applies above 125°C junction temperature?

The device enters thermal shutdown at 150°C (absolute max), but recommended operating junction temperature is capped at +125°C. Above 125°C, output current must be linearly derated to zero at 150°C. PCB layout must ensure θ_JA ≤20.5 K/W using ≥4 oz copper, thermal vias under PGND pads, and airflow ≥200 LFM to sustain 70 A at full temperature range.