TDA21590 Procurement Guide: 90 A Infineon OptiMOS Power Stage with On-Chip Current Sense

Why this part is getting attention #

AI server, high-performance computing and 48 V rack power designs keep pushing more current through less board area. A single GPU, CPU or ASIC core rail can draw several hundred amps at sub-1 V, so the conversion stage between the 12 V (or 48 V-derived) bus and the core is now a critical, high-stress component. The Infineon TDA21590 is a 90 A integrated smart power stage that combines the gate driver, control and synchronous MOSFETs plus an on-chip current-sense path into one OptiMOS package.

For procurement teams, the TDA21590 is not a commodity MOSFET or a stand-alone regulator. It is a DrMOS-style power stage that pairs with a digital multiphase PWM controller and converts an intermediate bus into the low-voltage, high-current rails that feed processors and accelerators. The wrong package, suffix, controller pairing or date-code window can stall a build, so the RFQ has to be precise — and the part competes for allocation with other 70–90 A stages across the Infineon portfolio.

What the TDA21590 is #

The TDA21590 is a fully integrated synchronous-buck smart power stage in Infineon's OptiMOS family, listed by Infineon as Active and preferred. The orderable part number is TDA21590AUMA1. Official product documentation gives the following headline parameters:

• Input voltage (VIN): 4.25 V to 16 V — compatible with a 12 V intermediate bus.
• Output voltage: 0.225 V to 5.5 V at VIN = 12 V, covering modern CPU/GPU/ASIC core rails.
• Continuous output current: 90 A, with over-current protection around 120 A.
• Switching frequency: 100 kHz to 1500 kHz.
• Current sensing: on-chip MOSFET current reporting at 5 µA/A.
• Telemetry accuracy: 3% current and temperature reporting.
• Control input: 3.3 V tri-state PWM, compatible with mainstream multiphase controllers.
• Package: PG-IQFN-39, a 5 mm × 6 mm × 0.9 mm PQFN.
• Quiescent power: deep-sleep typically 32 µA when EN is low.
• Reliability / qualification: Industrial grade, RoHS compliant, halogen free, moisture sensitivity level 2.
• Packing: tape-and-reel, 5000 pieces per reel.

The diagram above shows where the TDA21590 sits: a digital multiphase controller drives several parallel TDA21590 stages, and each stage feeds its on-chip current and temperature reading back to the controller. Multiple stages share the load to deliver the very high currents that AI accelerators and server CPUs require.

Where it sits in the Infineon power-stage family #

Infineon lists the TDA21590 alongside a range of integrated smart power stages. Knowing the neighbours matters, because they share the same controller ecosystem but differ in current rating, package and qualification — and only some are footprint-compatible.

Non-Hardware Verified

Two points are worth flagging to buyers. First, the TDA21570, TDA21590, TDA21472, TDA21490 and TDA21475 all use the same PG-IQFN-39 5×6 mm footprint, so they are the natural drop-in current-rating ladder within the family — but current rating, telemetry accuracy and generation still differ, so a swap is an engineering change, not a blind substitution. Second, the TDA22590 is not footprint-compatible: it uses a 4 mm × 6 mm Chip-Embedded UFLGA-34 package and would require a board re-spin.

For automotive or body-electronics builds, the TLF12500 / TLF12501 / TLF12505 parts offer AEC-Q100 qualification at roughly 60 A with headroom to 90 A, a different PG-VIQFN-36 package and a separate sourcing line from the industrial TDA21xxx series.

Controller pairing #

The TDA21590 is a stage, not a regulator by itself: it needs a digital multiphase PWM controller to set phase count, loop compensation and protection. Infineon's TDA21590 page features controllers such as XDPE15284D-0000, XDPE152C4D-0000, XDPE19283B-0000, XDPE192C3B-0000 and XDPE15254D-0000, all of which speak the 3.3 V tri-state PWM interface the stage expects. A closely related pairing route uses integrated POL regulators such as IR3889MTRPBF, IR3888BMTRPBF, IR3888AMTRPBF or TDA38740-0000 when a single-output module is a better fit than a discrete multiphase array.

The procurement takeaway: always carry the controller part number on the RFQ. A 90 A stage is only as useful as the controller that drives it, and phase-count, current-share and telemetry features vary across the XDPE family.

Technical and sourcing position #

Buyer risk points #

• Same package, different generation. TDA21590 (TDA21xxx) and TDA21490/TDA21472 (TDA214xxx) share the 5×6 mm PQFN footprint but are different generations with different telemetry and feature sets. Treat them as engineering-evaluated alternatives, not automatic equivalents.
• Footprint trap with TDA22590. The TDA22590 is also 90 A but uses a 4×6 mm UFLGA-34 package. The two are not interchangeable without a board change.
• Automotive vs industrial. The TLF125xx parts are AEC-Q100 qualified; the TDA21xxx/TDA214xxx parts are industrial. Do not mix qualification classes across a BOM without design sign-off.
• Allocation and lead time. Smart power stages have been on extended lead times for server and AI programmes. Catalogue listings are not a commitment; confirm the exact date code, quantity, packaging condition and real lead time by RFQ.
• Thermal qualification. A 90 A phase in a 5×6 mm package demands careful PCB copper, via design and airflow. The part may meet its data-sheet rating in the reference layout but not in a denser custom board unless thermally validated.
• Authenticity. For allocation-constrained devices, request certificate of conformance, packing slip and, where possible, lot traceability. Independent distributors should provide photos, date-code labels and original reel information.

Practical RFQ notes #

When sending an RFQ for TDA21590, include:

• Exact part number and orderable code: TDA21590 / TDA21590AUMA1.
• Target quantity and acceptable date-code range.
• Packaging requirement: tape-and-reel, full reel (5000) or cut-tape quantity.
• Paired controller part number, if known (for example an XDPE15284D or XDPE15254D controller).
• End application and required qualification class (industrial vs AEC-Q100).
• Required shipping destination and Incoterms.
• Any approved-manufacturer or replacement restrictions from the OEM/EMS.

If the design can accept a different current rating in the same 5×6 mm footprint, ask your supplier to also quote TDA21490 (90 A) or TDA21472 (70 A) as engineering-evaluated alternates. If board area is the constraint and a smaller package is acceptable, TDA22590 is the higher-density 90 A option — but only after a layout review, because the package is not the same.

Conclusion #

The Infineon TDA21590 is a high-current 90 A smart power stage built for the dense core rails of AI servers and data-center hardware, with on-chip current and temperature telemetry that simplifies multiphase control. Procurement teams should treat it as a precision-matched component: package suffix, controller interface, generation and thermal design all matter. Confirm every detail — including the paired controller and an exact date code — by RFQ before releasing a PO, and keep the wider TDA21xxx / TDA214xxx / TLF125xx family in view so allocation pressure on one member does not stall the build.

Official references #

• Infineon TDA21590 product page — High Efficiency OptiMOS 90A Integrated Current Sense Power Stage
• Infineon Integrated Power Stages product portfolio