Infineon Technologies TDA38806XUMA1

Overview

TDA38806XUMA1 from Infineon Technologies is a 6 A synchronous buck regulator with Constant On-Time (COT) control, operating from 2.7 V to 16 V input (with external VCC) or 4 V to 16 V (with internal bias), delivering precision 0.6 V ±0.5% reference voltage and supporting ceramic output capacitors without external compensation. It serves as a point-of-load DC-DC converter in server VR13/VR14 subsystems, telecom power modules, and storage controller rails.

For engineers reviewing the TDA38806XUMA1 datasheet, TDA38806XUMA1 pinout, TDA38806XUMA1 application, or TDA38806XUMA1 equivalent, key selection criteria include programmable soft-start (≥1 ms), selectable switching frequencies (600 kHz / 1.1 MHz / 2 MHz), thermally compensated over-current protection, voltage tracking capability via SS/REF, and non-latch fault responses including OVP, UVP, and thermal shutdown.

Technical Context

The TDA38806XUMA1 implements a fast Constant On-Time (COT) control architecture that enables sub-100 ns transient response while maintaining stable regulation across line and load variations. Its adaptive on-time generator dynamically adjusts based on input voltage and output voltage feedback to sustain pseudo-constant frequency operation.

It integrates dual-mode operation-Force Continuous Conduction Mode (FCCM) for low-noise fixed-frequency behavior and Diode Emulation Mode (DEM) for improved light-load efficiency-and supports pre-bias start-up, output sinking mode (OSM), and voltage tracking using an external reference applied to the SS/REF pin.

Key Specifications

Pinout & Package

Package: QFN-14 (2 mm × 3 mm, 0.5 mm pitch), exposed thermal pad, RoHS-compliant, halogen-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP2386GQ-P and TPS546B24RVFT, the TDA38806XUMA1 uniquely combines 6 A capability, no-compensation stability, analog voltage tracking, and thermally compensated OCP in a compact QFN-14 - making it optimal for analog-controlled, high-density industrial and telecom POL designs where simplicity and reliability are prioritized over digital configurability.

Availability

TDA38806XUMA1 is available at Aetrix Electronics and suitable for server CPU core rails, telecom line card bias supplies, and enterprise SSD controller power delivery requiring stable component supply, long-term lifecycle assurance, and JEDEC-qualified industrial reliability.

Supply support for TDA38806XUMA1 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 ICs, and industrial control solutions, with global manufacturing and qualification infrastructure.

The TDA38806 belongs to Infineon's TDA38x family of integrated buck regulators designed for high-efficiency, low-noise point-of-load conversion in space-constrained server, storage, and communications equipment.

FAQ

What input voltage configurations does the TDA38806XUMA1 support?

The TDA38806XUMA1 supports two input bias modes: internal bias (4 V–16 V VIN only) and external VCC bias (2.7 V–16 V VIN with 3.3 V applied to VCC). External bias enables operation from 3.3 V intermediate buses and improves light-load efficiency. The VCC pin functions as both output (internal LDO) and input (external bias source), depending on configuration.

How is over-current protection implemented and what makes it thermally compensated?

OCP uses internal valley-current sensing with a dedicated CS pin and resistor-based trip threshold. Thermal compensation is achieved via on-die temperature sensing that scales the current limit threshold inversely with junction temperature - ensuring consistent OCP trip point across -40 °C to 125 °C junction range without external components or calibration.

Can the TDA38806XUMA1 safely start into a pre-biased output?

Yes. The TDA38806XUMA1 features hardware-enforced pre-bias start-up: it monitors output voltage before enabling the high-side FET and disables switching if VOUT exceeds 80% of target during startup. This prevents reverse current flow through the inductor and avoids output collapse or component stress when powering into charged capacitors.

What layout practices are critical for stable COT operation?

Stable COT operation requires minimizing parasitic inductance on SW, BST, and PGND paths: use wide copper pours for PGND and SW; place BST capacitor directly between BST and SW pins; tie AGND and PGND at a single point near the IC; keep FB trace short, direct, and away from noisy nodes; and avoid vias in CS, FB, and SS/REF signal paths to prevent instability or false OCP triggering.