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Infineon Technologies TDA38826XUMA1
- Part No.:
- TDA38826XUMA1
- Manufacturer:
- Infineon Technologies
- Package:
- 21-PowerUFQFN
- Datasheet:
-
TDA38826XUMA1.pdf
- Description:
- IC REG BUCK ADJ 20A TSNP-21-1
- Quantity:
- Payment:
- Shipping:
Inventory:5,995
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Product details
Overview
TDA38826XUMA1 from Infineon Technologies is a 20 A synchronous buck regulator with Constant On-Time (COT) control, operating from 2.7 V to 16 V input (with external VCC), delivering precision 0.9 V ±0.5% output, and supporting selectable 600/800/1000 kHz switching in a QFN-21 (3 mm × 4 mm) package for server point-of-load applications.
For engineers reviewing the TDA38826XUMA1 datasheet, TDA38826XUMA1 pinout, TDA38826XUMA1 application, or TDA38826XUMA1 equivalent, this IC enables fast transient response in distributed power architectures requiring pre-bias start-up, voltage tracking, and thermally compensated overcurrent protection without external compensation.
Technical Context
The TDA38826XUMA1 implements a fast Constant On-Time (COT) control architecture that eliminates loop compensation components while maintaining tight line/load regulation and sub-10 µs load transient recovery. Its adaptive on-time generator dynamically adjusts based on input/output voltage and load conditions.
It integrates dual-mode operation-Forced Continuous Conduction Mode (FCCM) for low-noise fixed-frequency behavior and Diode Emulation Mode (DEM) for high light-load efficiency-and supports voltage tracking via the SS/VREF pin with external reference input and programmable soft-start (≥1.5 ms).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 20 A continuous; supports full-rated load without derating up to Tj = 105 °C in typical PCB layouts. |
| Input Voltage Range | 2.7 V–16 V with external 3.3 V VCC bias; 4 V–16 V with internal bias-enables compatibility with 3.3 V, 5 V, and 12 V intermediate bus rails. |
| Reference Voltage | 0.9 V ±0.5%; sets output accuracy directly-critical for DDR memory and FPGA core rail tolerance compliance. |
| Switching Frequency | Selectable 600 / 800 / 1000 kHz; determines trade-off between inductor size, efficiency, and EMI profile. |
| Thermal Shutdown | Latch-off at Tj ≥ 150 °C; includes thermal compensation of current limit to maintain consistent OCP threshold across temperature. |
| Soft-Start Time | Programmable ≥1.5 ms via SS/VREF capacitor; prevents inrush current during power-up and supports controlled sequencing. |
| Protection Features | Latch-off OCP, UVP, OVP, and thermal shutdown; ensures system-level fault containment without external supervision circuitry. |
Pinout & Package
Package: QFN-21 (3 mm × 4 mm, 0.5 mm pitch), exposed thermal pad, RoHS-compliant, halogen-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST (Pin 1) | Bootstrap supply input | Connects to SW node via ceramic capacitor to generate floating gate drive voltage for high-side MOSFET. |
| AGND (Pin 2) | Analog ground reference | Control circuit common return-must be isolated from PGND to avoid noise coupling into feedback path. |
| CS (Pin 3) | Current sense input | Accepts resistor-to-AGND to set thermally compensated overcurrent trip threshold (e.g., 22 mΩ = ~20 A). |
| MODE (Pin 4) | Operating mode select | Voltage-programmed pin to configure CCM/DEM and select 600/800/1000 kHz switching frequency. |
| SS/VREF (Pin 5) | Soft-start & tracking reference | Capacitor sets soft-start time; external voltage applied here enables output voltage tracking of another rail. |
| RGND (Pin 6) | Remote sense return | Differential remote sensing negative input-short to GND if local sensing only. |
| FB (Pin 7) | Feedback input | Resistor divider from VOUT to RGND sets output voltage; feedforward capacitor improves transient response. |
| EN (Pin 8) | Enable input | Active-high logic input with internal voltage monitoring-requires ≥2.4 V to enable, ≤0.8 V to disable. |
| PGOOD (Pin 9) | Power-good output | Open-drain signal indicating VOUT within ±5% regulation; requires external pull-up for logic-level interface. |
| VIN (Pins 10, 21) | Main power input | High-current input for internal FETs and driver stage-requires low-ESR bulk + ceramic decoupling near pins. |
| PGND (Pins 11–18) | Power ground | High-current return path for switch node and inductor-must be low-inductance copper pour tied to thermal pad. |
| VCC (Pin 19) | Internal LDO output | 3.3 V regulated supply for control logic and gate drivers-requires ≥1 µF X7R/X5R ceramic decoupling. |
| SW (Pin 20) | Switch node output | Drives external inductor; connects to BST capacitor and inductor-high di/dt node requiring minimized loop area. |
Key Features
| Feature | Design Value |
|---|---|
| No external compensation required | Constant On-Time control eliminates need for type-II/type-III compensation network-reduces BOM count and layout sensitivity. |
| Pre-bias start-up support | Enables safe startup into pre-charged output capacitors-prevents reverse current flow and protects downstream loads. |
| Voltage tracking capability | SS/VREF pin accepts external reference to synchronize ramp-up with master rail-essential for multi-rail SoC sequencing. |
| Thermally compensated current limit | CS pin current threshold scales inversely with junction temperature-maintains consistent OCP trip point from -40 °C to 125 °C. |
| Enhanced light-load efficiency modes | FCCM ensures fixed frequency under all loads; DEM disables low-side FET during off-time to reduce conduction loss at <10% load. |
Applications
| Server CPU Core Supply | Enterprise SSD Power Rail |
|---|---|
Use Scenario: Delivering tightly regulated 0.9 V to high-performance x86 CPU cores with dynamic load steps up to 15 A/µs. IC Role / Device Role / Timing Role: Primary point-of-load regulator implementing COT control for sub-10 µs transient recovery and seamless voltage tracking with VRM controller. Use Value: Eliminates external compensation and supports pre-bias start-up-reducing design cycle time and enabling reliable cold-boot into powered-backplane systems. | Use Scenario: Providing stable 1.2 V or 1.8 V to NAND flash controllers and DRAM buffers in NVMe SSD modules. IC Role / Device Role / Timing Role: Secondary POL regulator with programmable soft-start and PGOOD sequencing for multi-rail power-up coordination. Use Value: Selectable 800 kHz switching balances efficiency and inductor size in space-constrained M.2 form factor while maintaining ±0.5% output accuracy. |
| 5G Baseband ASIC Supply | Industrial FPGA I/O Bank Rail |
Use Scenario: Powering 5G massive MIMO baseband processors requiring low-noise, fast-transient 1.0 V supplies in telecom equipment. IC Role / Device Role / Timing Role: High-current buck converter operating in FCCM mode to suppress switching frequency variation and minimize conducted EMI. Use Value: Integrated LDO-based VCC generation and robust OVP/UVP protection ensure uninterrupted operation in harsh RF environments with fluctuating input rails. | Use Scenario: Generating configurable 1.2 V, 1.8 V, or 2.5 V I/O supply for Xilinx or Intel industrial FPGAs deployed in factory automation PLCs. IC Role / Device Role / Timing Role: Flexible POL regulator supporting voltage tracking across multiple I/O banks and programmable current limit for board-level fault isolation. Use Value: QFN-21 package with exposed thermal pad enables >15 W dissipation in convection-cooled enclosures-meeting extended temperature (-40 °C to 125 °C) requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2960GQ-Z (Monolithic Power) | 18 A rating, 4.5–18 V input, fixed 600 kHz, no voltage tracking or pre-bias start-up. | Lacks SS/VREF tracking and pre-bias capability-unsuitable for multi-rail sequencing or hot-swap systems. | Choose when fixed-frequency simplicity and lower cost outweigh advanced sequencing needs. |
| TPS546D24A (Texas Instruments) | 25 A rating, 3–18 V input, PMBus interface, digital loop compensation, no DEM mode. | Supports telemetry and dynamic configuration but adds firmware dependency and layout complexity. | Choose when digital monitoring, margining, and real-time loop tuning are required over analog simplicity. |
Compared with MP2960GQ-Z and TPS546D24A, the TDA38826XUMA1 uniquely combines analog COT control, voltage tracking, pre-bias start-up, and thermally compensated OCP in a compact QFN-21-making it optimal for industrial and telecom POL where reliability and analog determinism are prioritized over digital configurability.
Availability
TDA38826XUMA1 is available at Aetrix Electronics and suitable for server CPU core supplies, enterprise SSD power rails, and 5G baseband ASIC applications requiring stable component supply, long-term lifecycle support, and JEDEC-qualified industrial reliability.
Supply support for TDA38826XUMA1 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, and industrial control ICs, with leadership in silicon and SiC-based power solutions.
The TDA38826 belongs to Infineon's TDA38x family of integrated high-current buck regulators, designed specifically for demanding point-of-load applications in datacenter, telecom, and industrial infrastructure where efficiency, thermal resilience, and sequencing robustness are critical.
FAQ
What input voltage configurations does the TDA38826XUMA1 support?
The TDA38826XUMA1 operates with two bias configurations: internal bias enables 4 V–16 V input range, while external 3.3 V VCC supply extends operation down to 2.7 V input. The VCC pin must be decoupled with ≥1 µF X7R ceramic capacitor placed adjacent to Pin 19 per layout guidelines.
How is the current limit programmed and thermally compensated?
Current limit is set by a resistor from CS (Pin 3) to AGND, with nominal trip point of 20 A at 25 °C using a 22 mΩ resistor. The internal thermal compensation circuit automatically reduces the effective current threshold as junction temperature rises, maintaining consistent OCP behavior across -40 °C to 125 °C.
Does the TDA38826XUMA1 require external compensation components?
No-its Constant On-Time (COT) control architecture eliminates the need for external compensation networks. Stability is inherent across all ceramic output capacitor types and values, simplifying design and reducing component count versus traditional voltage-mode or current-mode controllers.
Can the TDA38826XUMA1 start up into a pre-biased output?
Yes-the device features enhanced pre-bias start-up functionality that prevents reverse current flow when enabled into an already charged output capacitor. This avoids potential damage to downstream loads and ensures safe cold-boot operation in redundant or hot-swap power systems.
TDA38826XUMA1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 21-PowerUFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 0.9V
- Voltage - Output (Max):
- 6V
- Current - Output:
- 20A
- Frequency - Switching:
- 600kHz, 800kHz, 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PG-TSNP-21-1
TDA38826XUMA1 FAQ
1.How can I place an order for TDA38826XUMA1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TDA38826XUMA1 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for TDA38826XUMA1 reliable?
The price and inventory of TDA38826XUMA1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA38826XUMA1 is usually 5 days.
3.What payment methods are accepted for TDA38826XUMA1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA38826XUMA1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TDA38826XUMA1?
TDA38826XUMA1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TDA38826XUMA1 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for TDA38826XUMA1?
For technical support, including TDA38826XUMA1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA38826XUMA1 requirements.
6.How does Aetrix verify that TDA38826XUMA1 is sourced from the original manufacturer or authorized distributors?
All TDA38826XUMA1 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TDA38826XUMA1 meets industry standards.
7.What is the process for return or replacement of TDA38826XUMA1?
All TDA38826XUMA1 units undergo pre-shipment inspection (PSI). If there is an issue with TDA38826XUMA1, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The TDA38826XUMA1 part is unused and in its original packaging.
Return procedure for TDA38826XUMA1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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