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Texas Instruments TPS54308DDCT
- Part No.:
- TPS54308DDCT
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
TPS54308DDCT.pdf
- Description:
- IC REG BUCK ADJ 3A SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:634
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Product details
Overview
TPS54308DDCT from Texas Instruments is a synchronous step-down DC/DC converter IC with integrated 85-mΩ high-side and 40-mΩ low-side MOSFETs, delivering up to 3-A continuous output current across a 4.5-V to 28-V input range. It operates in forced continuous conduction mode (FCCM) at a fixed 350-kHz switching frequency, features internal loop compensation and 5-ms soft start, and is used in compact 12-V/24-V distributed power supplies for consumer audio and STB systems.
For engineers reviewing the TPS54308DDCT datasheet, TPS54308DDCT pinout, TPS54308DDCT application, or TPS54308DDCT equivalent, key selection criteria include its SOT-23-6 package footprint, FCCM operation for ripple-sensitive loads, 2-μA shutdown current, integrated bootstrap diode, and overvoltage protection triggering at 118% of nominal output voltage.
Technical Context
The TPS54308DDCT implements peak current-mode control with internal slope compensation to prevent subharmonic oscillation across duty cycles. Its error amplifier has 240 µA/V transconductance and integrates frequency compensation components between COMP and GND.
FCCM operation maintains near-constant 350-kHz switching frequency from light to full load, avoiding audible noise in audio applications. Overcurrent protection includes cycle-by-cycle high-side limiting (typ. 5 A), low-side source/sink current limits (typ. 4 A / 2.8 A), and hiccup-mode recovery after 512 fault cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 28 V - supports direct connection to 12-V and 24-V industrial/consumer bus rails without pre-regulation. |
| Output Current | 3 A continuous - enables single-chip regulation for mid-power subsystems like STB SoC cores or audio amplifiers. |
| Switching Frequency | 350 kHz (fixed) - ensures predictable EMI profile and simplifies filter design with stable ripple across load range. |
| Quiescent Current | 300 µA (non-switching), 2 µA (shutdown) - extends battery life in always-on standby circuits. |
| Feedback Reference | 0.596 V ±2.5% - sets output voltage via external resistor divider; enables precise 3.3-V or 5-V generation with 1% resistors. |
| Thermal Shutdown | 165°C (rising), 155°C (falling) - provides robust protection during sustained overload or poor PCB thermal design. |
| Soft-Start Time | 5 ms (internal) - limits inrush current into output capacitors, preventing input rail sag and system brownouts. |
Pinout & Package
SOT-23-6 package (1.60 mm × 2.90 mm body size) with exposed pad for thermal enhancement; requires minimal PCB area and supports high-density layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Power ground reference | Low-side MOSFET source and controller ground return; must be connected to single-point ground near FB divider for stability. |
| SW (Pin 2) | Switch node | Connection point between high- and low-side MOSFETs; routes high dv/dt switching waveform to external inductor and boot capacitor. |
| VIN (Pin 3) | Main input supply | Drain terminal of high-side MOSFET; accepts 4.5–28 V; requires local 10-µF ceramic decoupling. |
| FB (Pin 4) | Feedback input | Compares output voltage (via resistor divider) to 0.596-V internal reference; determines regulation accuracy and loop bandwidth. |
| EN (Pin 5) | Enable control | Logic-level input with 1.28-V rising threshold; floating enables device; internal pullup allows simple on/off control without external bias. |
| BOOT (Pin 6) | High-side gate drive supply | Connects to SW through 0.1-µF ceramic capacitor; supplies gate voltage for high-side MOSFET; monitored by internal UVLO (2.1 V). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power Stage | 85-mΩ high-side + 40-mΩ low-side MOSFETs enable 3-A output in SOT-23-6 without external switches or drivers. |
| Force Continuous Conduction Mode (FCCM) | Maintains constant 350-kHz switching across all loads - eliminates frequency foldback and associated audible noise in audio systems. |
| Internal Loop Compensation | Eliminates need for external compensation network; reduces BOM count and layout sensitivity while ensuring stable operation with standard output capacitors. |
| Overvoltage Protection (OVP) | Shuts off high-side MOSFET when FB exceeds 118% × 0.596 V (≈700 mV), then re-enables only after falling below 104% (≈620 mV) - prevents damage during load dump or transient recovery. |
| Thermal Hiccup Protection | Enters 32768-cycle shutdown/restart cycle upon junction temperature >165°C - limits average power dissipation during sustained thermal overload. |
Applications
| Audio Amplifier Power Supply | STB/DTV Main Rail |
|---|---|
Use Scenario: Powers Class-D audio amplifier ICs in home theater receivers requiring clean, ripple-free 12-V or 5-V rails. IC Role / Device Role / Timing Role: Primary buck regulator converting 24-V bus to regulated 12-V output; FCCM operation avoids switching frequency modulation into audible band. Use Value: 350-kHz fixed frequency and internal compensation ensure consistent EMI filtering and eliminate need for external loop tuning. | Use Scenario: Supplies 3.3-V core voltage to SoC and memory in set-top boxes operating from 12-V wall adapter input. IC Role / Device Role / Timing Role: High-efficiency step-down converter with 3-A capability; integrated MOSFETs reduce board space versus discrete solutions. Use Value: 2-μA shutdown current enables ultra-low-power standby mode compliant with ENERGY STAR® requirements. |
| White Goods Control Module | Printer Motor Driver Bias Rail |
Use Scenario: Generates 5-V logic supply for microcontroller and sensor interface in washing machine control boards. IC Role / Device Role / Timing Role: Input-supply regulator tolerant of 28-V surges on 24-V industrial bus; thermal hiccup protects against enclosure overheating. Use Value: 165°C thermal shutdown and 87.1°C/W junction-to-ambient resistance allow reliable operation in sealed enclosures without forced airflow. | Use Scenario: Provides 5-V bias voltage for stepper motor driver ICs in inkjet printers during active printing cycles. IC Role / Device Role / Timing Role: High-current (3-A) buck converter handling pulsed loads from motor phase switching; low-side current limit prevents inductor saturation. Use Value: Low-side MOSFET sink current limit (2.8 A typ.) protects against reverse current during motor freewheeling, enhancing reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54302DDCR | Same SOT-23-6 package, 4.5–28-V input, but 2-A output and 2.5-μA shutdown current; lacks OVP and hiccup-mode thermal recovery. | Lower output current and missing protections limit use to non-critical, lower-power loads where cost is primary. | Select when 2-A output suffices and OVP/thermal hiccup are not required; offers lower BOM cost. |
| MP2307DN-LF-Z | 3-A SOT-23-6 buck with 4.5–26-V input, but 500-kHz switching, no internal soft start, and 10-μA shutdown current. | Higher frequency increases EMI risk in noise-sensitive audio; lack of soft start may cause inrush issues in systems with large output capacitance. | Choose for higher-frequency designs where smaller inductors are prioritized and soft-start timing is managed externally. |
Compared with TPS54308DDCT, TPS54302DDCR trades output current and protection features for lower cost, while MP2307DN-LF-Z sacrifices soft start and OVP for higher switching frequency - making TPS54308DDCT optimal for FCCM-dependent, protection-critical 3-A applications in consumer electronics.
Availability
TPS54308DDCT is available at Aetrix Electronics and suitable for 12-V/24-V distributed power-bus supplies, white goods control modules, and consumer audio/STB systems requiring stable component supply and long-term production continuity.
Supply support for TPS54308DDCT 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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management technologies with broad industrial and consumer market reach.
The TPS54308DDCT belongs to TI's high-density synchronous buck converter product line, designed specifically for space-constrained, medium-current DC/DC conversion in consumer electronics and industrial control applications where FCCM operation and integrated protection are essential.
FAQ
What is the maximum output current capability of the TPS54308DDCT?
The TPS54308DDCT delivers up to 3 A of continuous output current under recommended operating conditions (TJ ≤ 125°C, VIN = 4.5–28 V). This rating assumes proper PCB thermal design with adequate copper area and airflow; derating applies above 85°C ambient. The high-side current limit is typically 5 A, and low-side source/sink limits are 4 A and 2.8 A respectively - all verified per TI SLUSCV2A datasheet Section 6.5.
Does the TPS54308DDCT require an external bootstrap diode?
No, the TPS54308DDCT does not require an external bootstrap diode. It integrates a boot recharge circuit that eliminates the need for a discrete diode. A 0.1-µF ceramic capacitor must be placed between BOOT and SW pins to provide gate drive voltage for the high-side MOSFET, as specified in Section 7.3.10 of the TI SLUSCV2A datasheet.
How does the TPS54308DDCT handle overvoltage events on the output rail?
The TPS54308DDCT incorporates dedicated overvoltage protection (OVP) that monitors the FB pin. When the feedback voltage exceeds 118% of the internal 0.596-V reference (≈700 mV), the high-side MOSFET is immediately disabled. It remains off until FB falls below 104% of VREF (≈620 mV), at which point normal regulation resumes - preventing damage during load-dump transients or startup overshoot.
Can the TPS54308DDCT operate with a pre-biased output voltage?
Yes, the TPS54308DDCT supports safe start-up into pre-biased outputs. During monotonic pre-biased start-up, both high-side and low-side MOSFETs remain off until the internal soft-start voltage exceeds the FB pin voltage - preventing the low-side MOSFET from discharging the pre-charged output capacitor. This behavior is documented in Section 7.3.6 of the TI SLUSCV2A datasheet.
What is the thermal performance of the TPS54308DDCT in its SOT-23-6 package?
The TPS54308DDCT in SOT-23-6 (DDCT) package has a junction-to-ambient thermal resistance (RθJA) of 87.1°C/W and junction-to-board (RθJB) of 14.4°C/W, per Section 6.4 of the TI SLUSCV2A datasheet. With proper 2-layer PCB layout (≥1 in² 2-oz copper pour under exposed pad), it sustains 3-A output at 125°C junction temperature. Thermal shutdown activates at 165°C with 10°C hysteresis.
TPS54308DDCT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- 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):
- 4.5V
- Voltage - Input (Max):
- 28V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 26V
- Current - Output:
- 3A
- Frequency - Switching:
- 350kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-THIN
TPS54308DDCT FAQ
1.How can I place an order for TPS54308DDCT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54308DDCT 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 TPS54308DDCT reliable?
The price and inventory of TPS54308DDCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54308DDCT is usually 5 days.
3.What payment methods are accepted for TPS54308DDCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54308DDCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54308DDCT?
TPS54308DDCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54308DDCT 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 TPS54308DDCT?
For technical support, including TPS54308DDCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54308DDCT requirements.
6.How does Aetrix verify that TPS54308DDCT is sourced from the original manufacturer or authorized distributors?
All TPS54308DDCT 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 TPS54308DDCT meets industry standards.
7.What is the process for return or replacement of TPS54308DDCT?
All TPS54308DDCT units undergo pre-shipment inspection (PSI). If there is an issue with TPS54308DDCT, 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 TPS54308DDCT part is unused and in its original packaging.
Return procedure for TPS54308DDCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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