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Infineon Technologies TDA38825XUMA1
- Part No.:
- TDA38825XUMA1
- Manufacturer:
- Infineon Technologies
- Package:
- 21-PowerUFQFN
- Datasheet:
-
TDA38825XUMA1.pdf
- Description:
- IC REG BUCK ADJ 20A TSNP-21-1
- Quantity:
- Payment:
- Shipping:
Inventory:4,987
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Product details
Overview
TDA38825XUMA1 from Infineon is a 20 A fully integrated synchronous Buck regulator with Fast Constant On-Time (COT) control, operating from 2.7 V to 16 V input (with external VCC bias) or 4 V to 16 V (internal bias), delivering precision 0.6 V ±0.5% reference voltage, and supporting selectable 600/800/1000 kHz switching frequency for server point-of-load power delivery.
For engineers reviewing the TDA38825XUMA1 datasheet, TDA38825XUMA1 pinout, TDA38825XUMA1 application, or TDA38825XUMA1 equivalent, key selection criteria include its ceramic-capacitor compatibility, programmable soft-start (≥1 ms), diode emulation mode for light-load efficiency, thermal-compensated overcurrent protection, and QFN-21 (3 mm × 4 mm) package with integrated high- and low-side MOSFETs.
Technical Context
The TDA38825XUMA1 implements a Fast Constant On-Time (COT) control architecture that eliminates external compensation while enabling sub-100 ns load transient response and stable regulation across wide VIN and VOUT ranges. Its adaptive on-time generator dynamically adjusts based on input/output voltage and load, maintaining pseudo-constant frequency without requiring loop compensation components.
It integrates dual-mode operation-Forced Continuous Conduction Mode (FCCM) for ripple-sensitive loads and Diode Emulation Mode (DEM) for >90% efficiency at 10 mA load-with independent configuration via the MODE pin. Voltage tracking is supported through the SS/VREF pin accepting an external reference, enabling coordinated startup in multi-rail systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 20 A continuous; supports full-rated current without derating up to Tj = 125 °C in typical PCB layouts. |
| Input Voltage Range | 2.7–16 V with external 3.3 V VCC bias; 4–16 V with internal bias - enables flexibility across 3.3 V, 5 V, and 12 V intermediate bus architectures. |
| Reference Voltage | 0.6 V ±0.5% (±3 mV); enables accurate output programming down to 0.6 V with <1% total error including resistor tolerance and temperature drift. |
| Switching Frequency | Selectable 600 / 800 / 1000 kHz; higher frequencies reduce inductor size but increase switching loss - optimized for 1–2 µH inductors in 3 mm × 4 mm footprint designs. |
| Soft-Start Time | Programmable ≥1 ms via SS/VREF capacitor; prevents inrush current during power-up and supports controlled sequencing in multi-rail systems. |
| Thermal Shutdown | Non-latch thermal shutdown at Tj ≥ 150 °C with automatic recovery; ensures safe operation under sustained overload or poor airflow conditions. |
| Protection Features | Non-latch OCP with internal thermal compensation, latch-off OVP (≥115% VOUT), UVP (≤85% VOUT), pre-bias start-up, and PGOOD with 1 ms delay - meets industrial fault-handling requirements. |
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 bootstrap capacitor to generate gate drive voltage for high-side MOSFET; requires X7R/X5R 100 nF ceramic capacitor. |
| AGND (Pin 2) | Analog ground reference | Control circuit ground return; must be isolated from PGND except at single-point connection near IC to minimize noise coupling into FB/CS paths. |
| CS (Pin 3) | Current sense input | Accepts voltage from external sense resistor to set overcurrent threshold; internally compensated for MOSFET RDS(ON) temperature drift. |
| MODE (Pin 4) | Operating mode select | Resistor-programmed pin selecting CCM/FCCM/DEM and switching frequency - enables dynamic efficiency optimization without firmware. |
| SS/VREF (Pin 5) | Soft-start timing & tracking reference | Capacitor sets soft-start ramp time; external DC voltage enables precise voltage tracking of another rail during startup or regulation. |
| RGND (Pin 6) | Remote sense return | Differential negative sense input for remote voltage sensing; short to AGND if local sensing only - improves regulation accuracy under PCB trace IR drop. |
| FB (Pin 7) | Feedback input | High-impedance input for resistor divider; connects to output via feedforward capacitor (CFF) to enhance transient response without instability. |
| EN (Pin 8) | Enable control | Active-high logic input with internal 2.8 V UVLO; supports sequenced turn-on via resistive divider from upstream rail or microcontroller GPIO. |
| PGOOD (Pin 9) | Power-good indicator | Open-drain output asserting high when VOUT ≥ 92.5% of target; requires external pull-up to defined logic rail for system monitoring or enable chaining. |
| VIN (Pins 10, 21) | Main power input | High-current input for internal power stages; must be decoupled with low-ESR ceramic capacitors placed adjacent to pins and connected via wide copper pours. |
| PGND (Pins 11–18) | Power ground return | Low-impedance return path for high-side/low-side MOSFETs and inductor; occupies 8 pins to minimize ground bounce and thermal resistance. |
| VCC (Pin 19) | Internal LDO output | 3 V regulated output powering gate drivers and control logic; requires ≥1 µF X7R/X5R ceramic capacitor close to pin for stability under fast load transients. |
| SW (Pin 20) | Switch node | Drives external inductor; swings from near-VIN to near-PGND; requires tight layout with minimal loop area to reduce EMI and voltage ringing. |
Key Features
| Feature | Design Value |
|---|---|
| No external compensation required | Fast COT control eliminates need for type-II/type-III compensation network - reduces BOM count and design iteration time by >3 weeks. |
| Ceramic output capacitor support | Stable with low-ESR ceramic capacitors (e.g., 22–100 µF X5R/X7R); avoids costly tantalum or polymer alternatives and simplifies thermal management. |
| Programmable current limit | Set via single external resistor on CS pin; thermal compensation maintains consistent trip point from –40 °C to +125 °C junction temperature. |
| Enhanced pre-bias start-up | Allows safe startup into pre-charged output capacitors without reverse current flow - critical for hot-swap and redundant power systems. |
| Voltage tracking capability | SS/VREF pin accepts external reference (0.6–2.5 V) to synchronize ramp rate and final voltage with master rail - enables seamless multi-rail sequencing in FPGAs and ASICs. |
Applications
| Server VR13/VR14 Core Power | Enterprise SSD Power Rail |
|---|---|
Use Scenario: Providing core voltage (0.8–1.2 V) to high-performance CPUs and GPUs in 1U/2U rack servers with strict transient response and thermal constraints. IC Role / Device Role / Timing Role: Primary point-of-load (POL) regulator delivering 20 A at ≤1% output ripple, using COT control to meet VR13/VR14 load-step specifications (e.g., 10–90% in <5 µs). Use Value: Eliminates external compensation and supports 800 kHz switching - enabling compact 12 mm² solution size while maintaining >92% efficiency at 12 V input / 1 V output / 10 A. | Use Scenario: Powering NAND flash and controller rails (1.2 V, 1.8 V, 3.3 V) in NVMe SSDs where space, efficiency at light load, and reliability under thermal cycling are critical. IC Role / Device Role / Timing Role: Secondary POL regulator operating in Diode Emulation Mode (DEM) to maintain >88% efficiency at 10 mA load, with programmable soft-start preventing inrush into stacked NAND capacitance. Use Value: Pre-bias start-up and non-latch OCP prevent data corruption during hot-plug events; QFN-21 package fits within 8 mm × 10 mm SSD power section. |
| 5G Baseband Unit (BBU) Signal Processing | Industrial FPGA I/O Bank Supply |
Use Scenario: Delivering clean, low-noise 1.0 V supply to FPGA fabric and ADC/DAC signal chains in outdoor 5G RRUs with ambient temperatures up to 85 °C. IC Role / Device Role / Timing Role: High-efficiency buck converter with voltage tracking (via SS/VREF) to coordinate with auxiliary 1.8 V I/O rail during FPGA configuration and runtime reconfiguration. Use Value: Ceramic-capacitor stability and 0.6 V ±0.5% reference ensure <±10 mV output deviation across temperature - meeting JESD204B analog supply jitter requirements. | Use Scenario: Powering configurable I/O banks (1.2 V, 1.35 V, 1.5 V, 1.8 V) in industrial PLCs and motor drives where long-term reliability and extended temperature operation (–40 °C to +85 °C ambient) are mandatory. IC Role / Device Role / Timing Role: Programmable POL regulator with latch-off OVP and thermal shutdown - protecting FPGA I/O against field-induced overvoltage and enclosure overheating. Use Value: Qualified per JEDEC industrial standards; operates continuously at Tj = 125 °C with no derating - enabling fanless enclosure designs in harsh environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous Buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2451DT-LF-Z (Monolithic Power) | 3 A rated, 2–24 V input, fixed 340 kHz fSW, no voltage tracking or DEM mode | Suitable for lower-current auxiliary rails only; lacks pre-bias start-up and thermal-compensated OCP | Select only for <5 A, non-critical sequencing applications where cost is primary constraint. |
| TPS54821RHLR (Texas Instruments) | 20 A rated, 4.5–20 V input, D-CAP2 control, supports 300–1200 kHz fSW, no integrated VCC LDO | Requires external 3.3 V bias for VCC; lacks SS/VREF tracking pin and DEM mode | Prefer when existing 3.3 V bias rail is available and voltage tracking is unnecessary. |
Compared with MP2451DT-LF-Z and TPS54821RHLR, the TDA38825XUMA1 uniquely combines 20 A capability, integrated VCC LDO, voltage tracking, and DEM mode in a 3 mm × 4 mm QFN - making it optimal for space-constrained, multi-rail industrial and telecom POL designs requiring autonomous sequencing and light-load efficiency.
Availability
TDA38825XUMA1 is available at Aetrix Electronics and suitable for server VR13/VR14 core power, enterprise SSD power rails, and 5G baseband unit signal processing requiring stable component supply, JEDEC-qualified industrial reliability, and long-term production continuity.
Supply support for TDA38825XUMA1 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 TDA38825 belongs to Infineon's TDA series of highly integrated POL regulators, designed specifically for high-density, high-efficiency point-of-load conversion in datacenter, telecom, and industrial computing systems.
FAQ
What is the minimum recommended output capacitance for stable operation?
The TDA38825XUMA1 is stable with ≥22 µF total ceramic output capacitance (X5R/X7R, 6.3 V rating), distributed across multiple parallel capacitors near the FB and PGND pins. Layout must minimize trace inductance between output caps and PGND; insufficient capacitance causes undershoot exceeding 5% during 10–90% load steps at 20 A/µs slew rate.
How does the MODE pin configure switching frequency and operation mode?
The MODE pin uses three resistor values to select: 100 kΩ → 600 kHz CCM, 200 kΩ → 800 kHz FCCM, 330 kΩ → 1 MHz DEM. FCCM forces continuous inductor current for low-noise operation; DEM disables low-side switch during light load to eliminate reverse current and improve efficiency below 100 mA.
Can the TDA38825XUMA1 safely start into a pre-biased output?
Yes - the TDA38825XUMA1 includes enhanced pre-bias start-up circuitry that monitors output voltage before enabling the high-side switch. If VOUT > 0.4 V at EN assertion, the device delays switching until the output discharges below threshold via internal sinking, preventing reverse current and potential damage to downstream components.
What thermal pad soldering guidelines apply to the QFN-21 package?
The exposed thermal pad (Pin 21) must be soldered to a minimum 120 mm² copper pour with ≥4 thermal vias (0.3 mm diameter, filled or capped) connecting to inner ground planes. Insufficient thermal relief increases junction-to-board θJB by >15 °C/W, risking thermal shutdown at >15 A continuous load in still-air conditions.
TDA38825XUMA1 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):
- 2.7V
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 5.5V
- 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
TDA38825XUMA1 FAQ
1.How can I place an order for TDA38825XUMA1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TDA38825XUMA1 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 TDA38825XUMA1 reliable?
The price and inventory of TDA38825XUMA1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA38825XUMA1 is usually 5 days.
3.What payment methods are accepted for TDA38825XUMA1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA38825XUMA1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TDA38825XUMA1?
TDA38825XUMA1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TDA38825XUMA1 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 TDA38825XUMA1?
For technical support, including TDA38825XUMA1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA38825XUMA1 requirements.
6.How does Aetrix verify that TDA38825XUMA1 is sourced from the original manufacturer or authorized distributors?
All TDA38825XUMA1 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 TDA38825XUMA1 meets industry standards.
7.What is the process for return or replacement of TDA38825XUMA1?
All TDA38825XUMA1 units undergo pre-shipment inspection (PSI). If there is an issue with TDA38825XUMA1, 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 TDA38825XUMA1 part is unused and in its original packaging.
Return procedure for TDA38825XUMA1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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