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Texas Instruments TPS54331DDA
- Part No.:
- TPS54331DDA
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS54331DDA.pdf
- Description:
- IC REG BUCK ADJ 3A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:731
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Product details
Overview
TPS54331DDA from Texas Instruments is a 28-V input, 3-A non-synchronous buck DC-DC converter with integrated 80-mΩ high-side MOSFET, fixed 570-kHz switching frequency, Eco-mode pulse-skipping for light-load efficiency, and adjustable output down to 0.8 V. It serves as the primary step-down regulator in industrial power supplies requiring stable 5-V/12-V rails from 24-V bus inputs.
For engineers reviewing the TPS54331DDA datasheet, TPS54331DDA pinout, TPS54331DDA application, or TPS54331DDA equivalent, key selection criteria include its SO PowerPAD™ thermal performance (RθJA = 48.7°C/W), 1-μA shutdown current for battery-backed systems, programmable UVLO, and cycle-by-cycle current limiting with frequency foldback protection.
Technical Context
The TPS54331DDA implements constant-frequency peak-current mode control with internal slope compensation, eliminating need for external ramp injection and enabling stable operation with ceramic output capacitors. Its transconductance error amplifier (92 μA/V) and COMP pin interface simplify loop compensation while supporting fast transient response.
It integrates boot recharge diode and monitors BOOT-PH voltage (UVLO threshold ≈2.1 V) to ensure reliable high-side gate drive. Overvoltage transient protection activates when VSENSE exceeds 109% × 0.8 V (≈0.872 V), clamping PH to prevent output overshoot during load dump or fault recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5 V to 28 V - supports wide industrial and automotive supply rails without pre-regulation |
| Output Current | 3 A continuous - enables single-chip 5-V/3-A or 3.3-V/3-A rails for FPGA I/O or microcontroller cores |
| Switching Frequency | 570 kHz (typical) - balances EMI, inductor size, and efficiency for compact PCB layouts |
| Shutdown Quiescent Current | 1 μA (typical) - extends battery life in always-on monitoring systems |
| Voltage Reference | 0.8 V ±2% initial accuracy - sets precise output regulation point with minimal external resistor tolerance impact |
| High-Side RDS(on) | 80 mΩ at VBOOT-PH = 6 V - reduces conduction loss and thermal stress at full load |
| Eco-mode Threshold | 160 mA (typical peak inductor current) - triggers pulse skipping to maintain >85% efficiency at 10-mA loads |
Pinout & Package
The TPS54331DDA uses an 8-pin SOIC package with exposed PowerPAD™ thermal pad (Pin 9), optimized for low junction-to-board thermal resistance (RθJB = 25.5°C/W). The PowerPAD must be soldered to a thermal plane for rated performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOT | Bootstrap supply node | Connects 0.1-μF X7R/X5R capacitor to PH; enables high-side MOSFET gate drive above VIN |
| VIN | Main input supply | Accepts 3.5–28 V; powers internal circuitry and high-side driver; requires local 4.7-μF ceramic bypass |
| EN | Enable control input | Pulled up internally; float to enable; pull below 1.25 V to disable; supports programmable UVLO with resistor divider |
| SS | Slow-start timing node | 2-μA internal current source charges external capacitor; sets soft-start time (1–10 ms typical) |
| PH | Power switch node | Source of internal high-side MOSFET; connects to inductor; carries full switching current and ripple |
| GND | Analog/digital ground | Reference for control circuitry; must be connected to PowerPAD for thermal and electrical integrity |
| COMP | Error amplifier output | Drives PWM comparator; connects to RC network for loop compensation; sinks/sources ±7 μA |
| VSENSE | Feedback input | Inverting input of gm amplifier; compares to 0.8-V reference; sets output voltage via resistor divider |
Key Features
| Feature | Design Value |
|---|---|
| Pulse Skipping Eco-mode | Maintains >85% efficiency at 10-mA loads by disabling switching cycles below 160-mA peak inductor current |
| Integrated Boot Diode | Eliminates external bootstrap diode, reducing BOM count and layout complexity in space-constrained designs |
| Overvoltage Transient Protection | Clamps PH when VSENSE exceeds 109% × 0.8 V, limiting output overshoot to <±3% during unload transients |
| Frequency Foldback | Reduces switching frequency to 71 kHz (1/8×) under severe overload, limiting inductor current rise rate and thermal stress |
| Thermal Shutdown | Halts switching at 165°C junction temperature and auto-restarts after die cools below trip threshold |
Applications
| Industrial Power Supply | Car Audio System |
|---|---|
Use Scenario: Distributed 5-V rail generation from 24-V factory automation bus with strict thermal limits. IC Role / Device Role / Timing Role: Primary non-synchronous buck regulator delivering regulated 5 V at up to 3 A with fixed 570-kHz switching. Use Value: SO PowerPAD™ package achieves 48.7°C/W RθJA, enabling full 3-A output without heatsink in 70°C ambient. | Use Scenario: Clean 12-V supply for DSP and amplifier stages in automotive head units with battery backup. IC Role / Device Role / Timing Role: Step-down converter accepting 9–16-V battery input, regulating to stable 12 V with Eco-mode for standby audio decoding. Use Value: 1-μA shutdown current preserves battery charge during vehicle ignition-off periods; UVLO hysteresis prevents brownout oscillation. |
| LCD Display Backlight | Set-Top Box Power |
Use Scenario: Efficient 18-V backlight driver supply from 24-V wall adapter in commercial signage displays. IC Role / Device Role / Timing Role: High-efficiency buck converter stepping 24 V down to 18 V at 1.5 A, operating in Eco-mode during dimmed states. Use Value: Pulse skipping maintains >90% efficiency at 100-mA backlight current, reducing thermal load on display PCB. | Use Scenario: Compact 3.3-V core supply for SoC and memory in consumer IPTV boxes with limited board area. IC Role / Device Role / Timing Role: Primary 3.3-V/3-A regulator using ceramic output caps; leverages internal slope compensation for stability. Use Value: Fixed 570-kHz frequency allows small 6.8-μH inductor; integrated MOSFET eliminates external switch, saving 3 mm² layout area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54332DDA | 1-MHz switching frequency, higher 3.5-A current limit, same SO PowerPAD™ package | Better suited for ultra-compact designs needing smaller magnetics; less optimal for EMI-sensitive audio systems | Select TPS54332DDA when footprint reduction and faster transient response outweigh EMI concerns. |
| TPS54231DR | 2-A output, SOIC-8 (no PowerPAD), 570-kHz frequency, identical control architecture | Limited to 2-A loads; higher RθJA (116.3°C/W) requires derating above 1.5 A in still-air environments | Choose TPS54231DR only for cost-sensitive, lower-current applications where thermal margin is sufficient. |
Compared with TPS54331DDA, TPS54332DDA offers higher frequency and current but increases EMI filtering complexity, while TPS54231DR reduces thermal capability and output capacity-making TPS54331DDA the balanced choice for 3-A industrial 24-V-to-5-V conversion with thermal headroom.
Availability
TPS54331DDA is available at Aetrix Electronics and suitable for industrial power supplies, car audio systems, LCD display backlights, and set-top box power rails requiring stable component supply and long-term manufacturability.
Supply support for TPS54331DDA 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
Texas Instruments is a global semiconductor leader designing analog ICs, embedded processors, and power management solutions for industrial, automotive, and consumer markets.
The TPS54331DDA belongs to TI's SWIFT™ family of integrated DC-DC converters, engineered for high-efficiency, thermally robust, and easy-to-design power solutions in space- and thermal-constrained applications.
FAQ
What is the maximum recommended output current for TPS54331DDA in continuous operation?
The TPS54331DDA supports 3-A continuous output current under proper thermal conditions. This rating assumes use of the SO PowerPAD™ package with adequate PCB copper area (≥4 cm² thermal pad), ambient temperature ≤70°C, and airflow ≥200 LFM. At 150°C junction temperature, the device enters thermal shutdown to protect itself and the load.
Does TPS54331DDA require an external bootstrap diode?
No, the TPS54331DDA integrates the bootstrap diode internally. Only a 0.1-μF X7R or X5R ceramic capacitor between BOOT and PH pins is required to sustain gate drive for the high-side MOSFET. This integration reduces component count, PCB area, and potential failure points compared to discrete bootstrap solutions.
How does Eco-mode function in TPS54331DDA, and what triggers its activation?
TPS54331DDA enters Eco-mode when peak inductor current drops below 160 mA (typical), causing the COMP pin voltage to clamp at 0.5 V and skip switching cycles. This reduces switching losses and maintains >85% efficiency at light loads (e.g., 10–100 mA), making it ideal for standby or low-power states in battery-powered or always-on systems.
Can TPS54331DDA operate with input voltages below 3.5 V?
The TPS54331DDA is specified for 3.5–28 V input, and operation below 3.5 V is not guaranteed. Below this threshold, the internal UVLO may prevent startup, and gate drive margin degrades. While some units may function down to ~2.8 V with reduced efficiency and output regulation, TI does not characterize or recommend sub-3.5-V operation for production designs.
What is the purpose of the PowerPAD™ on the TPS54331DDA package, and how must it be connected?
The PowerPAD™ on the TPS54331DDA is an exposed thermal pad (Pin 9) that must be soldered directly to a large GND copper pour on the PCB. It provides critical thermal conduction path-reducing RθJB to 25.5°C/W-and also serves as the primary GND reference for internal circuitry. Leaving it unconnected or floating violates thermal and electrical specifications and risks premature failure.
TPS54331DDA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- Eco-Mode™
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.5V
- Voltage - Input (Max):
- 28V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 25V
- Current - Output:
- 3A
- Frequency - Switching:
- 570kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
TPS54331DDA FAQ
1.How can I place an order for TPS54331DDA through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54331DDA 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 TPS54331DDA reliable?
The price and inventory of TPS54331DDA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54331DDA is usually 5 days.
3.What payment methods are accepted for TPS54331DDA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54331DDA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54331DDA?
TPS54331DDA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54331DDA 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 TPS54331DDA?
For technical support, including TPS54331DDA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54331DDA requirements.
6.How does Aetrix verify that TPS54331DDA is sourced from the original manufacturer or authorized distributors?
All TPS54331DDA 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 TPS54331DDA meets industry standards.
7.What is the process for return or replacement of TPS54331DDA?
All TPS54331DDA units undergo pre-shipment inspection (PSI). If there is an issue with TPS54331DDA, 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 TPS54331DDA part is unused and in its original packaging.
Return procedure for TPS54331DDA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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