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Texas Instruments TPS54335DDA
- Part No.:
- TPS54335DDA
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS54335DDA.pdf
- Description:
- IC REG BUCK ADJ 3A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:2,686
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Product details
Overview
TPS54335DDA from Texas Instruments is a synchronous step-down DC-DC converter with integrated 128-mΩ high-side and 84-mΩ low-side MOSFETs, delivering up to 3-A continuous output current from a 4.5-V to 28-V input. It features internal 2-ms soft-start, adjustable 50-kHz to 1.5-MHz switching frequency via RT pin, 0.8-V ±0.8% reference voltage, and current-mode control for stable regulation in consumer power supplies such as digital TVs and set-top boxes.
For engineers reviewing the TPS54335DDA datasheet, TPS54335DDA pinout, TPS54335DDA application, or TPS54335DDA equivalent, key selection considerations include input voltage range compatibility, soft-start timing requirements, thermal performance in SO PowerPAD package, and functional distinction from fixed-frequency TPS54336 variants.
Technical Context
The TPS54335DDA implements constant-frequency peak current-mode control with cycle-by-cycle high-side current limiting (4–6.5 A) and low-side sourcing/sinking current limits (3.5–6.1 A). Its error amplifier uses transconductance of 1300 µmhos and interfaces with external compensation components at the COMP pin.
Startup behavior includes monotonic pre-biased output support and BOOT-PH UVLO (2.1 V typical) that disables the high-side MOSFET during boot capacitor undercharge. Overvoltage transition protection activates when VOUT exceeds 106% of nominal, forcing high-side shutdown until recovery below 104%.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 28 V - supports wide industrial and consumer bus rails including 5-V, 12-V, and 24-V distributed systems. |
| Output Current | 3 A continuous - enables single-chip power delivery for mid-power applications without external current sharing. |
| Switching Frequency | 50 kHz to 1.5 MHz adjustable via RT resistor - allows optimization of size (high fSW) vs. efficiency (low fSW) and EMI filtering design. |
| Voltage Reference | 0.8 V ±0.8% at TJ = 25°C - ensures precise output regulation across load and line variations with minimal external divider error. |
| Quiescent Current | 2 µA in shutdown - minimizes standby power loss in battery-backed or always-on systems. |
| Thermal Resistance | RθJA = 42.1°C/W (SO PowerPAD) - defines maximum power dissipation capability under standard PCB layout conditions. |
| Enable Threshold | 1.21 V to 1.28 V rising - compatible with standard logic-level GPIO or microcontroller enable signals without level-shifting. |
Pinout & Package
TPS54335DDA is housed in an 8-pin SO PowerPAD™ package (4.89 mm × 3.90 mm) with exposed thermal pad connected to GND for enhanced thermal performance. The PowerPAD must be soldered to a PCB ground plane using multiple vias.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | 4.5–28 V supply input; requires local ceramic decoupling near pin to minimize high-frequency noise and switching loop inductance. |
| PH | Power Switch Node | Source of internal high-side MOSFET and drain of low-side MOSFET; connects to output inductor and bootstrap capacitor. |
| GND | Ground Reference | Analog and power ground return; tied directly to exposed thermal pad for optimal thermal and electrical performance. |
| BOOT | Bootstrap Supply | Connects to PH via 0.1-µF X7R/X5R ceramic capacitor to generate gate drive voltage for high-side MOSFET. |
| EN | Enable Control | Logic-level input with internal 1.15-µA pullup; floating enables operation; pulled low disables regulator and reduces IQ to 2 µA. |
| VSENSE | Feedback Input | Inverting input of transconductance error amplifier; senses output voltage via external resistor divider to set regulated VOUT. |
| COMP | Compensation Node | Error amplifier output; connects to external RC network for loop stability and transient response tuning. |
| RT | Frequency Set | Connects to external resistor to adjust oscillator frequency from 50 kHz to 1.5 MHz; no connection defaults to minimum frequency. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated High/Low-Side MOSFETs | 128-mΩ/84-mΩ RDS(on) enables >90% efficiency at 3-A load without external switches or diodes. |
| Internal Soft-Start | Fixed 2-ms ramp prevents inrush current and stabilizes startup into pre-biased outputs without external components. |
| Pulse Skipping at Light Load | Disables switching when peak inductor current falls below 0.5 A, reducing quiescent current and improving light-load efficiency. |
| Hiccup Mode OCP | Triggers after 512 cycles of overcurrent and holds shutdown for 16384 cycles before retry - protects against sustained short-circuit faults. |
| Overvoltage Transition Protection | Shuts off high-side MOSFET if VOUT exceeds 106% nominal and resumes only after falling below 104%, preventing output overshoot damage. |
Applications
| Digital TV Power Supply | Set-Top Box (STB) Core Rail |
|---|---|
Use Scenario: Provides stable 1.2-V or 1.8-V core voltage for SoC in digital television platforms operating from 12-V or 24-V input bus. IC Role / Device Role / Timing Role: Primary synchronous buck regulator managing dynamic load transients during video decoding and HDMI handshaking. Use Value: Monotonic startup prevents output discharge during hot-plug events; pulse skipping maintains <15-µA no-load IQ for Energy Star compliance. | Use Scenario: Generates 3.3-V auxiliary rail for USB, Ethernet PHY, and tuner modules in cable/satellite STBs with variable load profiles. IC Role / Device Role / Timing Role: Main DC-DC converter with adjustable frequency to avoid AM radio band interference while meeting EN55022 Class B emissions. Use Value: Adjustable RT-based frequency allows layout optimization for compact 4-layer PCBs; 0.8-V reference enables accurate 3.3-V regulation with 1% resistors. |
| Smart Meter MCU Supply | Industrial 24-V Distributed Bus |
Use Scenario: Powers 32-bit ARM Cortex-M microcontroller and RF transceiver in battery-assisted smart electricity meters with wide input range. IC Role / Device Role / Timing Role: Isolated primary-side buck regulator accepting fluctuating 9–28 V input from transformer or PoE interface. Use Value: 4.5–28 V input range accommodates brownout and surge conditions; 2-µA shutdown IQ extends battery life during meter sleep mode. | Use Scenario: Delivers 5-V/3-A rail from 24-V factory automation bus to PLC I/O modules and sensor interfaces requiring tight regulation. IC Role / Device Role / Timing Role: High-reliability point-of-load regulator with hiccup-mode OCP and thermal shutdown for unattended operation. Use Value: Integrated MOSFETs eliminate external component failure points; RθJA = 42.1°C/W enables convection-cooled operation at full load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54336DDA | Fixed 340-kHz switching frequency; adjustable soft-start via SS pin instead of internal 2-ms ramp. | Suitable where EMI filtering simplicity outweighs frequency flexibility; requires external SS capacitor for startup control. | Select TPS54336DDA when fixed frequency simplifies filter design and soft-start timing must be user-adjustable. |
| LM2678SD-ADJ/NOPB | Non-synchronous 5-A buck with external diode; 40-V max input; no integrated low-side switch or pulse-skipping. | Used in cost-sensitive industrial supplies where efficiency >90% is not required and board space allows discrete diode placement. | Choose LM2678SD-ADJ/NOPB only if higher input voltage (up to 40 V) is needed and lower light-load efficiency is acceptable. |
Compared with TPS54335DDA, TPS54336DDA trades frequency adjustability for simplified EMI design and user-defined soft-start, while LM2678SD-ADJ/NOPB offers higher input voltage tolerance but sacrifices integration, efficiency, and advanced protection features.
Availability
TPS54335DDA is available at Aetrix Electronics and suitable for digital TV power supplies, set-top box core rails, and smart meter MCU supplies requiring stable component supply with consistent parametric performance and long-term lifecycle support.
Supply support for TPS54335DDA 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 specializing in analog and embedded processing technologies, with decades of expertise in power management IC design and manufacturing.
The TPS5433x product line delivers highly integrated synchronous buck converters optimized for consumer, industrial, and communications equipment requiring high efficiency, small solution size, and robust protection features.
FAQ
What is the maximum output current supported by the TPS54335DDA?
The TPS54335DDA supports up to 3-A continuous output current under recommended operating conditions (TJ ≤ 150°C, proper PCB thermal design). Peak current capability reaches 4.9 A before high-side current-limit activation, but sustained operation above 3 A requires careful thermal management due to RθJA = 42.1°C/W in the SO PowerPAD package.
Does the TPS54335DDA require an external bootstrap diode?
No, the TPS54335DDA does not require an external bootstrap diode. It integrates a boot recharge circuit that automatically charges the BOOT–PH capacitor during low-side conduction. A 0.1-µF X7R/X5R ceramic capacitor between BOOT and PH is sufficient; adding a diode would interfere with internal boot regulation and is explicitly discouraged in the datasheet.
How is the switching frequency set on the TPS54335DDA?
The switching frequency of the TPS54335DDA is set by connecting an external resistor between the RT pin and GND. Frequency ranges from 50 kHz to 1.5 MHz depending on resistance value - e.g., 100 kΩ yields ~480 kHz, while 30 kΩ achieves ~1.5 MHz. No connection defaults to minimum frequency; the RT pin must not be left floating in production designs.
Can the TPS54335DDA safely start up into a pre-biased output?
Yes, the TPS54335DDA supports monotonic startup into pre-biased outputs. During startup, both high-side and low-side MOSFETs remain off until the internal soft-start voltage exceeds the VSENSE pin voltage, preventing reverse current flow through the low-side FET and avoiding output discharge or system reset issues.
What protection features are built into the TPS54335DDA?
The TPS54335DDA includes hiccup-mode overcurrent protection (triggered after 512 overcurrent cycles), thermal shutdown at 160–175°C with 10°C hysteresis, overvoltage transition protection (disables high-side if VOUT > 106%), BOOT–PH UVLO (2.1 V), and input UVLO with 180-mV hysteresis. These features ensure robust operation in real-world fault conditions without external supervision.
TPS54335DDA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SWIFT™
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 28V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 25V
- Current - Output:
- 3A
- Frequency - Switching:
- 50kHz ~ 1.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
TPS54335DDA FAQ
1.How can I place an order for TPS54335DDA through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54335DDA 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 TPS54335DDA reliable?
The price and inventory of TPS54335DDA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54335DDA is usually 5 days.
3.What payment methods are accepted for TPS54335DDA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54335DDA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54335DDA?
TPS54335DDA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54335DDA 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 TPS54335DDA?
For technical support, including TPS54335DDA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54335DDA requirements.
6.How does Aetrix verify that TPS54335DDA is sourced from the original manufacturer or authorized distributors?
All TPS54335DDA 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 TPS54335DDA meets industry standards.
7.What is the process for return or replacement of TPS54335DDA?
All TPS54335DDA units undergo pre-shipment inspection (PSI). If there is an issue with TPS54335DDA, 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 TPS54335DDA part is unused and in its original packaging.
Return procedure for TPS54335DDA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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