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Texas Instruments TPS54334DDA
- Part No.:
- TPS54334DDA
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS54334DDA.pdf
- Description:
- IC REG BUCK ADJ 3A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:453
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Product details
Overview
TPS54334DDA from Texas Instruments is a 4.2–28 V input, 3-A synchronous step-down DC/DC converter in an 8-pin SOIC PowerPAD™ package, integrating 128 mΩ/84 mΩ MOSFETs, featuring fixed 570 kHz switching frequency, 0.8 V ±1.5% reference, and power-good monitoring. It delivers regulated 3.3 V output for digital TV and industrial power rails.
For engineers reviewing the TPS54334DDA datasheet, TPS54334DDA pinout, TPS54334DDA application, or TPS54334DDA equivalent, key selection criteria include input voltage range (4.2–28 V), continuous 3-A output capability, thermal performance (RθJA = 42.1°C/W), monotonic start-up into pre-biased loads, and integrated BOOT diode for simplified layout.
Technical Context
The TPS54334DDA implements fixed-frequency peak current mode control with internal slope compensation to prevent subharmonic oscillation across duty cycles. Its error amplifier (1300 µA/V transconductance) drives COMP for loop stability, while dual overcurrent protection-high-side sourcing and low-side sourcing/sinking limits-enables robust fault handling.
Thermal hiccup protection triggers at 165°C junction temperature with 10°C hysteresis and 32,768-cycle restart delay; overvoltage protection disables the high-side MOSFET when VSENSE exceeds 116% of VREF, re-enabling only below 110%. The device supports monotonic start-up and operates down to 0.8 V output via external resistor divider.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.2 V to 28 V - supports wide industrial and automotive supply rails without external pre-regulation. |
| Output Current | 3 A continuous - sufficient for powering SoCs, FPGAs, and multi-rail systems from single-stage conversion. |
| Switching Frequency | 570 kHz typical - balances efficiency, size (smaller inductors/capacitors), and EMI profile for compact designs. |
| Voltage Reference | 0.8 V ±1.5% over temperature - enables accurate output regulation (e.g., 3.3 V ±1.5%) with minimal drift. |
| Shutdown Quiescent Current | 2 µA - extends battery life in always-on or standby applications such as smart meters and IoT edge nodes. |
| Thermal Resistance | RθJA = 42.1°C/W (SOIC-8 PowerPAD™) - requires minimal PCB copper area for thermal management in convection-cooled environments. |
| Power Good Threshold | 90–110% of VREF - provides reliable system sequencing and fault detection without external comparators. |
Pinout & Package
TPS54334DDA uses an 8-pin SOIC package with exposed thermal pad (PowerPAD™), requiring connection to PCB ground plane via multiple vias for optimal thermal performance and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply rail | Accepts 4.2–28 V; connects to bulk input capacitor and feeds internal regulator and gate drivers. |
| BOOT | Bootstrap supply node | Connects to 0.1 µF ceramic capacitor between BOOT and SW; enables high-side MOSFET gate drive above VIN. |
| SW | Switch node | Drives external inductor; voltage swings from GND to VIN; critical for EMI filtering and layout integrity. |
| GND | Power and signal reference | Pin 4 and exposed thermal pad must be tied to common ground plane; thermal pad improves θJA by ~10°C/W. |
| PGOOD | Open-drain status indicator | Pulled low if VSENSE < 84% or > 116% of VREF; requires external 10–100 kΩ pull-up to ≤5.5 V. |
| EN | Enable control input | Active-high; threshold 1.21 V (rising); internal pull-up allows floating-enable operation; supports external UVLO via resistor divider. |
| COMP | Error amplifier output | Connects to RC compensation network; sets loop bandwidth and phase margin; sensitive to noise and layout. |
| VSENSE | Feedback input | Monitors output via resistor divider; compares to 0.8 V reference; determines regulated output voltage (e.g., 3.3 V). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated MOSFETs | 128 mΩ high-side / 84 mΩ low-side - eliminates external switches, reduces BOM count, and improves efficiency at 3 A load. |
| Pulse-skipping light-load mode | Disables switching below ~0.5 A peak inductor current - cuts quiescent current to 2 µA and boosts efficiency in standby. |
| Monotonic pre-biased start-up | Prevents reverse current flow into powered outputs - essential for hot-swap and multi-rail sequencing in telecom and server systems. |
| Integrated BOOT diode | Eliminates external bootstrap diode - simplifies layout, reduces component count, and improves reliability in space-constrained designs. |
| Hiccup-mode overcurrent protection | 512-cycle wait + 16,384-cycle restart delay - limits average power dissipation during sustained overload without latch-off. |
Applications
| Digital TV Power Supply | Smart Meter DC-DC Stage |
|---|---|
Use Scenario: Powers SoC, memory, and display interface in 4K DTV with 12 V input bus. IC Role / Device Role / Timing Role: Primary 3.3 V buck regulator delivering 3 A continuous current with tight load transient response. Use Value: Integrated MOSFETs and 570 kHz switching enable compact 12 mm × 12 mm solution size; PGOOD ensures safe SoC boot sequencing. | Use Scenario: Converts 24 V battery or solar input to isolated 3.3 V for microcontroller and RF transceiver in AMI meter. IC Role / Device Role / Timing Role: Main DC-DC stage providing regulated 3.3 V with ultra-low shutdown current (2 µA) for battery longevity. Use Value: 4.2–28 V input range accommodates wide battery discharge curve; thermal hiccup protection sustains operation during surge events. |
| Industrial PLC I/O Module | Car Audio DSP Power Rail |
Use Scenario: Supplies 3.3 V to isolated digital I/O ASICs in DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: Robust point-of-load regulator with EN-controlled sequencing and PGOOD feedback to host MCU. Use Value: RθJA = 42.1°C/W and thermal shutdown (165°C) ensure reliability in unventilated enclosures up to 70°C ambient. | Use Scenario: Generates clean 3.3 V for digital signal processor in automotive head unit with 12 V nominal battery input. IC Role / Device Role / Timing Role: High-efficiency synchronous buck converter supporting cold-crank (4.2 V) and load-dump (28 V) conditions. Use Value: Input UVLO (3.9 V rising) prevents brownout operation; monotonic start-up avoids glitching DSP during ignition cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54332DDA | Lower 3.5-A current limit, same SOIC-8 package, 600 kHz fSW, no PGOOD | Lacks power-good signaling; unsuitable where system-level fault reporting is required | Select only if PGOOD is unnecessary and higher current margin is not needed. |
| MP2334HG-33-LF-Z | 3.3 V fixed-output variant, 3.5 A rating, 8-pin SOIC, no EN or PGOOD pins | Fixed-output eliminates feedback resistors but removes adjustability and sequencing control | Choose for cost-sensitive, non-sequenced 3.3 V rails where design simplicity outweighs configurability. |
Compared with TPS54334DDA, TPS54332DDA omits PGOOD and has lower current capability, limiting system diagnostics and peak load headroom; MP2334HG-33-LF-Z trades adjustability and EN control for reduced BOM count in fixed-voltage deployments.
Availability
TPS54334DDA is available at Aetrix Electronics and suitable for digital TV power supplies, smart meter DC-DC stages, and industrial PLC I/O modules requiring stable component supply, long-term lifecycle support, and TI-qualified automotive-grade reliability.
Supply support for TPS54334DDA 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 TPS543xx family delivers highly integrated, thermally robust synchronous buck converters targeting space-constrained, high-reliability power supplies in set-top boxes, smart meters, and factory automation equipment.
FAQ
What is the minimum input voltage required for TPS54334DDA to assert PGOOD?
The TPS54334DDA achieves full PGOOD current sinking capability only when VIN exceeds 4.2 V. Below that, PGOOD enters a defined but reduced-current state once VIN rises above 1 V - sufficient for basic status indication but not for driving heavy loads or logic interfaces requiring 0.35 mA sink current.
Can TPS54334DDA operate with a 100% duty cycle?
TPS54334DDA may operate at 100% duty cycle only if the BOOT-SW voltage remains above 2.2 V (typical BOOT-SW UVLO threshold). However, the datasheet explicitly warns against operating at 100% duty ratio with no load, as boot capacitor recharge relies on SW node toggling - sustained 100% operation risks high-side MOSFET disable and regulation loss.
How does the TPS54334DDA handle pre-biased output conditions during start-up?
The TPS54334DDA implements safe monotonic start-up: both high-side and low-side MOSFETs remain off until the internal soft-start voltage exceeds the VSENSE pin voltage. This prevents reverse current flow from a pre-charged output capacitor into the IC, protecting downstream circuitry and ensuring controlled voltage ramp-up.
What is the recommended capacitor type and value for the BOOT-SW node on TPS54334DDA?
A 0.1 µF ceramic capacitor with X7R or X5R dielectric and ≥10 V rating is recommended for the BOOT-SW node on TPS54334DDA. These dielectrics provide stable capacitance over temperature and bias voltage, ensuring consistent high-side gate drive and preventing premature BOOT-SW UVLO triggering under load transients.
Does TPS54334DDA require external compensation components?
Yes, TPS54334DDA requires external RC compensation components connected between the COMP and GND pins. The error amplifier's transconductance (1300 µA/V) and power stage dynamics necessitate tailored pole-zero placement - typical networks use a series RC from COMP to GND plus optional feedforward capacitor - to achieve stable loop response across line/load/temperature.
TPS54334DDA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- 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):
- 4.2V
- Voltage - Input (Max):
- 28V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 24V
- Current - Output:
- 3A
- Frequency - Switching:
- 570kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
TPS54334DDA FAQ
1.How can I place an order for TPS54334DDA through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54334DDA 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 TPS54334DDA reliable?
The price and inventory of TPS54334DDA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54334DDA is usually 5 days.
3.What payment methods are accepted for TPS54334DDA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54334DDA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54334DDA?
TPS54334DDA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54334DDA 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 TPS54334DDA?
For technical support, including TPS54334DDA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54334DDA requirements.
6.How does Aetrix verify that TPS54334DDA is sourced from the original manufacturer or authorized distributors?
All TPS54334DDA 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 TPS54334DDA meets industry standards.
7.What is the process for return or replacement of TPS54334DDA?
All TPS54334DDA units undergo pre-shipment inspection (PSI). If there is an issue with TPS54334DDA, 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 TPS54334DDA part is unused and in its original packaging.
Return procedure for TPS54334DDA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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