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Texas Instruments TPS54335DDAR
- Part No.:
- TPS54335DDAR
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS54335DDAR.pdf
- Description:
- IC REG BUCK ADJ 3A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:1,906
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Product details
Overview
TPS54335DDAR 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 and industrial bus converters.
For engineers reviewing the TPS54335DDAR datasheet, TPS54335DDAR pinout, TPS54335DDAR application, or TPS54335DDAR equivalent, key selection considerations include its SO PowerPAD™ 8-pin package thermal performance, RT-resistor–based frequency tuning, monotonic startup into pre-biased outputs, hiccup-mode overcurrent protection, and compatibility with standard buck layout practices using external VSENSE feedback divider.
Technical Context
The TPS54335DDAR implements fixed-frequency peak current-mode control with cycle-by-cycle high-side current limiting (4.9 A typical) and low-side sourcing/sinking current limits (4.7 A / 0 A). Its error amplifier uses transconductance of 1300 µmhos and drives the COMP pin for external compensation, while slope compensation prevents subharmonic oscillation across duty cycles.
Startup behavior is controlled by an internal 2-ms soft-start ramp that overrides the 0.8-V reference until complete; the device supports monotonic startup into pre-biased outputs by inhibiting both MOSFETs until the soft-start voltage exceeds VSENSE. Overvoltage transition protection activates at 106% VOUT and resets at 104%, and BOOT-PH UVLO (2.1 V typical) ensures reliable high-side gate drive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 28 V - supports wide-input industrial and automotive bus rails without external LDO pre-regulation |
| Output Current | 3 A continuous - enables single-chip 5-V/12-V/24-V distributed power conversion for mid-power systems |
| Switching Frequency | 50 kHz to 1.5 MHz - adjustable via RT resistor for optimization of efficiency vs. size (e.g., 384–576 kHz at 100 kΩ) |
| Voltage Reference | 0.8 V ±0.8% at TJ = 25°C - enables precise output setting down to 0.8 V with minimal drift over temperature |
| Quiescent Current | 2 µA shutdown, 310 µA non-switching - extends battery life in always-on standby circuits |
| Thermal Resistance | RθJA = 42.1°C/W (SO PowerPAD) - requires minimal PCB copper area for thermal management at full load |
| Protection Features | Hiccup-mode OCP, thermal shutdown (160°C), BOOT-PH UVLO, OV transition protection - enables robust operation under fault conditions without external circuitry |
Pinout & Package
TPS54335DDAR is housed in an 8-pin SO PowerPAD™ package (4.89 mm × 3.90 mm) with exposed thermal pad connected to GND for enhanced heat dissipation. The PowerPAD must be soldered to a PCB ground plane using multiple vias.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply rail | Accepts 4.5–28 V; connects to bulk input capacitor and feeds internal regulator and high-side FET |
| PH | Power switch node | Drives external inductor; connects to BOOT capacitor and low-side FET source; critical for EMI layout |
| GND | Power and signal ground | Reference for all analog circuits; tied to exposed thermal pad for thermal and electrical integrity |
| BOOT | High-side gate drive supply | Requires 0.1-µF X7R/X5R ceramic capacitor to PH; UVLO disables HS FET if voltage drops below 2.1 V |
| EN | Enable control input | Logic-high >1.21 V enables operation; internal 1.15-µA pullup allows floating-enable configuration |
| VSENSE | Feedback input | Inverting input of error amplifier; sets output voltage via resistor divider to VOUT (0.8 V reference) |
| COMP | Error amplifier output | Connects to RC compensation network; drives current comparator for peak-current-mode control |
| RT | Frequency set input | Connects to external resistor to GND; determines switching frequency per fSW = 55300 / RRT (kΩ) kHz |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous MOSFET integration | 128-mΩ HS + 84-mΩ LS FETs eliminate external diode, reduce conduction loss, and enable >90% efficiency at 3 A |
| Adjustable switching frequency | 50–1500 kHz via RT pin - allows trade-off between inductor size (high fSW) and conduction loss (low fSW) |
| Monotonic pre-biased startup | Prevents reverse current flow into powered outputs by disabling both FETs until soft-start voltage exceeds VSENSE |
| Pulse-skipping light-load mode | Disables switching when peak inductor current falls below 0.5 A, reducing IQ to 2 µA in shutdown |
| Integrated boot recharge diode | Eliminates need for external bootstrap diode, simplifying layout and improving reliability in high-duty-cycle applications |
Applications
| Consumer Digital TV Power | Industrial 24-V Bus Converter |
|---|---|
Use Scenario: Powering SoC, memory, and display logic in digital TV mainboards with tight space constraints and variable load profiles. IC Role / Device Role / Timing Role: Primary 12-V-to-3.3-V/1.2-V synchronous buck regulator providing regulated core and I/O rails. Use Value: Internal 2-ms soft-start prevents inrush into pre-biased downstream rails; pulse-skipping maintains >85% efficiency at 100-mA standby load. | Use Scenario: Converting 24-V factory bus to 5-V for PLC I/O modules requiring high reliability and thermal resilience. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator with hiccup-mode OCP and thermal shutdown for unattended operation. Use Value: RθJA = 42.1°C/W enables full 3-A output without heatsink on 2-layer PCB; 160°C thermal shutdown protects against ambient overheating. |
| Smart Meter Auxiliary Supply | Car Audio DSP Power |
Use Scenario: Generating isolated 3.3-V rail from 12-V battery input in smart electricity meters with long service life requirements. IC Role / Device Role / Timing Role: Input-filter tolerant buck converter operating across cold-crank (4.5 V) to load-dump (28 V) conditions. Use Value: 4.5–28-V input range and 180-mV VIN UVLO hysteresis ensure stable startup and shutdown during automotive transients. | Use Scenario: Supplying clean 1.8-V core voltage to automotive-grade DSPs in infotainment head units with strict EMI limits. IC Role / Device Role / Timing Role: Low-noise synchronous buck with adjustable frequency (e.g., 600 kHz) to avoid AM radio band interference. Use Value: RT-resistor tuning enables precise frequency placement; current-mode control provides fast transient response to DSP burst loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54335ADDAR | Same silicon, identical electrical specs; DDA suffix denotes tape-and-reel packaging - no functional difference | No application impact; used interchangeably in production where reel format required | Select TPS54335ADDAR only when automated SMT placement mandates tape-and-reel delivery |
| MP2335DJ-LF-Z | 3-A, 4.5–28-V input, but fixed 500-kHz fSW and no RT pin; 0.8-V ref ±1.5%; higher RDS(on) (150/100 mΩ) | Lacks frequency adjustability and has looser reference accuracy - less suitable for precision or noise-sensitive designs | Consider MP2335DJ-LF-Z only for cost-sensitive, fixed-frequency applications where layout simplicity outweighs tuning flexibility |
Compared with TPS54335DDAR, TPS54335ADDAR offers identical performance in tape-and-reel form, while MP2335DJ-LF-Z trades frequency adjustability and reference accuracy for lower BOM count - making TPS54335DDAR preferable for designs requiring optimized efficiency, EMI control, or tight output tolerance.
Availability
TPS54335DDAR is available at Aetrix Electronics and suitable for consumer digital TV power supplies, industrial 24-V bus converters, and smart meter auxiliary supplies requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production lots.
Supply support for TPS54335DDAR 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, embedded processing, and power management ICs, with decades of expertise in high-efficiency DC-DC conversion.
The TPS5433x product line was designed for compact, high-reliability synchronous buck conversion in space-constrained consumer, industrial, and automotive applications - emphasizing integrated FETs, robust protection, and ease of layout.
FAQ
What is the maximum recommended switching frequency for TPS54335DDAR in continuous conduction mode?
The TPS54335DDAR supports up to 1.5 MHz switching frequency, but operation above 1 MHz increases switching losses and reduces efficiency at full 3-A load. For optimal thermal performance in continuous conduction mode, TI recommends ≤1 MHz with appropriate gate-drive strength and low-ESR output capacitors. The TPS54335DDAR datasheet specifies 1.5 MHz as absolute maximum, not recommended sustained operating limit.
Does TPS54335DDAR require an external bootstrap diode?
No, the TPS54335DDAR integrates a boot recharge diode, eliminating the need for an external component. A 0.1-µF X7R/X5R ceramic capacitor must still be placed between BOOT and PH pins to sustain high-side gate drive. This integration reduces BOM count and improves reliability compared to controllers requiring discrete bootstrap diodes.
Can TPS54335DDAR safely start up into a pre-biased output voltage?
Yes, the TPS54335DDAR implements monotonic startup into pre-biased outputs by disabling both high-side and low-side MOSFETs until the internal soft-start voltage exceeds the VSENSE pin voltage. This prevents reverse current flow and ensures controlled ramp-up even when the output is already biased - a critical feature for hot-swap and multi-rail systems.
What is the minimum input voltage required for TPS54335DDAR to maintain regulation?
The TPS54335DDAR requires a minimum input voltage of 4.5 V to operate within specification. Its input UVLO rising threshold is 4.5 V (typical), with 180-mV hysteresis, meaning it remains enabled down to 4.32 V before disabling. Below 4.5 V, the device may not sustain regulation or deliver full 3-A output, especially at elevated temperatures or high duty cycles.
How does the RT pin on TPS54335DDAR determine switching frequency?
The RT pin on TPS54335DDAR sets switching frequency by connecting an external resistor to GND. Frequency is calculated as fSW ≈ 55300 / RRT (kΩ) kHz - e.g., 100 kΩ yields ~553 kHz. This relationship is validated across temperature and input voltage; the TPS54335DDAR datasheet provides curves confirming stability from –40°C to 125°C with proper resistor tolerance.
TPS54335DDAR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SWIFT™
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
TPS54335DDAR FAQ
1.How can I place an order for TPS54335DDAR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54335DDAR 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 TPS54335DDAR reliable?
The price and inventory of TPS54335DDAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54335DDAR is usually 5 days.
3.What payment methods are accepted for TPS54335DDAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54335DDAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54335DDAR?
TPS54335DDAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54335DDAR 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 TPS54335DDAR?
For technical support, including TPS54335DDAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54335DDAR requirements.
6.How does Aetrix verify that TPS54335DDAR is sourced from the original manufacturer or authorized distributors?
All TPS54335DDAR 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 TPS54335DDAR meets industry standards.
7.What is the process for return or replacement of TPS54335DDAR?
All TPS54335DDAR units undergo pre-shipment inspection (PSI). If there is an issue with TPS54335DDAR, 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 TPS54335DDAR part is unused and in its original packaging.
Return procedure for TPS54335DDAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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