Infineon Technologies TDA21470

Overview

TDA21470 from Infineon Technologies is a 25 V integrated power stage (IPS) designed for high-current CPU/GPU/DDR core power delivery in server and datacom systems. It delivers up to 70 A continuous output current, operates at switching frequencies up to 1.5 MHz, supports 4.25–16 V input, 0.25–5.5 V output, and achieves >95% peak efficiency with dual-edge-trimmed dead time control.

For engineers reviewing the TDA21470 datasheet, TDA21470 pinout, TDA21470 application, or TDA21470 equivalent, key selection criteria include its Kelvin-sense-enabled R_DS(on) current reporting accuracy, programmable OCSET current limit, UVLO protection, deep-sleep PS4 mode (<200 µA), and 5×6 mm PQFN package compatibility with multi-phase VR designs.

Technical Context

The TDA21470 integrates high-side and low-side MOSFETs with a dedicated gate driver in a single multichip PQFN package, using advanced low-voltage silicon technology optimized for 5 V gate drive. Its internal current sensing relies on MOSFET R_DS(on) with Kelvin GND connection and integrated temperature compensation-eliminating reliance on inductor DCR sensing.

It implements cycle-by-cycle overcurrent protection with user-programmable threshold via OCSET pin and provides a fault flag output. UVLO ensures stable startup across the 4.25–16 V input range, while PS4 deep-sleep mode reduces quiescent current to <200 µA for system-level power state management.

Key Specifications

Pinout & Package

Package: 5 mm × 6 mm × 0.9 mm overmolded PQFN with 0.45 mm pitch, thermally enhanced exposed pad (EP), RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IR35411 and TDA21460, the TDA21470 uniquely delivers 70 A capability with deep-sleep PS4 mode-enabling both higher power density and finer system-level power state control in next-gen server and AI hardware.

Availability

TDA21470 is available at Aetrix Electronics and suitable for server CPU VR, AI accelerator GPU power, and DDR5 memory subsystems requiring stable component supply across multi-year production cycles.

Supply support for TDA21470 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 leader specializing in power management, automotive, and industrial control ICs, with global R&D and manufacturing infrastructure.

The TDA21470 belongs to Infineon's integrated power stage (IPS) portfolio, engineered specifically for high-efficiency, high-current point-of-load conversion in datacenter and telecom infrastructure.

FAQ

What is the recommended PCB layout practice for KGND on the TDA21470?

KGND must be routed as a dedicated, short, low-inductance trace directly to the Kelvin sense point at the source of the low-side MOSFET-separate from power GND. Avoid sharing vias or copper pours with high-current GND paths to maintain ±3% current sense accuracy. A dedicated inner-layer microstrip is preferred.

Does the TDA21470 support multiphase synchronization via external clock input?

No-the TDA21470 does not accept an external clock signal. It operates autonomously with internal oscillator and supports phase interleaving only through external controller coordination (e.g., via PWM input from a digital multiphase controller like IR35223). Synchronization is achieved at the controller level, not the IPS.

Can the OCSET pin be used for dynamic current limit adjustment during operation?

Yes-OCSET accepts a DC voltage (0.5–1.5 V) that linearly sets the cycle-by-cycle overcurrent threshold from ~40 A to 70 A. This allows real-time adaptation to changing thermal or load conditions when driven by an external DAC or analog control loop, without requiring device reset.

What thermal derating applies above 85°C case temperature?

Per Infineon's datasheet, the TDA21470 maintains full 70 A rating up to 85°C case temperature. Above 85°C, current capability derates linearly to 0 A at 125°C case, with thermal shutdown activating at 150°C junction. Required θ_JA must be ≤ 12°C/W for full-load operation in still air.