Infineon Technologies TDA38640A0000AUMA1

Overview

TDA38640A0000AUMA1 from Infineon is a fully integrated synchronous buck regulator with integrated OptiMOS™ power stages, supporting Intel SVID and PMBus/I²C interfaces. It delivers up to 40 A output current, operates from 3.0 V–17 V input, regulates output from 0.25 V–3.04 V, and features an enhanced Fast COT control engine for ceramic-capacitor stability-used in server VR13/VR14 CPU core power delivery.

For engineers reviewing the TDA38640A0000AUMA1 datasheet, TDA38640A0000AUMA1 pinout, TDA38640A0000AUMA1 application, or TDA38640A0000AUMA1 equivalent, key selection criteria include SVID compliance, 40 A continuous output rating, thermally compensated OCP with eight settings, 400 kHz–2 MHz programmable switching frequency (excluding 1600 kHz), and 12 V differential input current sensing without external interface circuitry.

Technical Context

The TDA38640A0000AUMA1 implements a digitally enhanced Fast Constant-On-Time (COT) control architecture with monotonic startup, pre-bias capability, and dual-mode operation (SVID or PMBus). Its internal PWM controller drives integrated high- and low-side OptiMOS FETs with bootstrap diode, eliminating external gate drivers.

It supports real-time telemetry of voltage, current, temperature, and power via I²C/PMBus, stores configuration in on-chip MTP memory (up to 14 writes), and enables digital load-line programming without external components-critical for dynamic CPU voltage scaling in VR14-compliant systems.

Key Specifications

Pinout & Package

Package: 5 mm × 6 mm PQFN, 40-pin, exposed thermal pad, RoHS2-compliant with Exemption 7a.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ISL91302BIRZ-T7A and MP8770GQ-Z, the TDA38640A0000AUMA1 uniquely combines VR14 SVID compliance, on-die 12 V current sensing, MTP-based configuration persistence, and Fast COT stability with ceramic-only output caps-making it the only option qualified for high-reliability server CPU core rails requiring full telemetry and adaptive voltage positioning.

Availability

TDA38640A0000AUMA1 is available at Aetrix Electronics and suitable for server CPU core power, AI accelerator VR, enterprise SSD controller power, and telecom baseband processor power applications requiring stable component supply across multi-year production cycles.

Supply support for TDA38640A0000AUMA1 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 AG is a German semiconductor manufacturer specializing in power management, automotive, and industrial control ICs, with leadership in silicon carbide and OptiMOS™ MOSFET technologies.

The TDA38640A belongs to Infineon's iPOL® family of intelligent POL regulators, designed specifically for high-efficiency, digitally controlled, SVID-compliant CPU/GPU core power delivery in datacenter and AI infrastructure.

FAQ

Does TDA38640A0000AUMA1 support VR14-compliant adaptive voltage positioning?

Yes. The device supports digital load-line programming via SVID register writes, enabling precise VR14-compliant adaptive voltage positioning without external resistors. The droop slope is fully configurable and stored in on-chip MTP memory, allowing dynamic adjustment during runtime to match processor VID transitions and thermal conditions.

What is the maximum junction temperature and thermal derating behavior?

The absolute maximum junction temperature is +125 °C, with continuous operation rated from –40 °C to +125 °C. Thermal derating begins at T_j = 105 °C per Figure 9 in the datasheet, reducing output current linearly to 0 A at 125 °C. The exposed thermal pad must be soldered to ≥4 cm² of 2-oz copper with ≥6 thermal vias for rated 40 A performance.

Can TDA38640A0000AUMA1 operate without an external bootstrap capacitor?

No. An external 1 µF X7R ceramic capacitor is required between BOOT and SW pins to sustain high-side FET gate drive. Omitting it causes immediate boot UVLO fault and prevents regulation. The device integrates a bootstrap diode but not the capacitor, as placement and ESR critically affect switching reliability at high frequencies.

How is input current measured, and what accuracy is achieved?

Input current is measured differentially across the internal sense element using VINSENP and VINSENM pins. Accuracy is ±3% over temperature (–40 °C to +125 °C) and line (3 V–17 V), calibrated per unit during test. No external sense resistor or amplifier is needed, eliminating gain drift and layout sensitivity inherent in discrete solutions.