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Texas Instruments TPS54308DDCR
- Part No.:
- TPS54308DDCR
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
TPS54308DDCR.pdf
- Description:
- IC REG BUCK ADJ 3A SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:13,511
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Product details
Overview
TPS54308DDCR 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, 5-ms soft start, and overvoltage/overcurrent/thermal protection - deployed in 12-V/24-V distributed power-bus supplies for printers and STB/DTV systems.
For engineers reviewing the TPS54308DDCR datasheet, TPS54308DDCR pinout, TPS54308DDCR application, or TPS54308DDCR equivalent, key selection considerations include FCCM operation for ripple-sensitive audio systems, 2-μA shutdown current for ultra-low-power standby, SOT-23 (6) package thermal performance (RθJA = 87.1°C/W), and integrated boot diode eliminating external components.
Technical Context
The TPS54308DDCR implements peak current-mode control with internal slope compensation to prevent subharmonic oscillation across duty cycles. Its error amplifier (240 µA/V transconductance) compares FB voltage against a 0.596-V reference and drives PWM timing via a fixed 350-kHz oscillator.
FCCM operation maintains constant switching frequency under light load, avoiding audible noise in audio applications. Protection includes cycle-by-cycle high-side current limiting (5-A typical), low-side source/sink current limits (4-A/2.8-A typical), hiccup-mode recovery after 512-cycle overcurrent persistence, and thermal shutdown at 165°C with 10°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 28 V - supports direct connection to 12-V/24-V industrial and consumer bus rails without pre-regulation. |
| Output Current | 3 A continuous - enables single-chip power delivery for mid-power digital loads like STB SoCs or printer motor drivers. |
| Switching Frequency | 350 kHz (typical) - balances EMI filtering cost and inductor size; maintained nearly constant across load range due to FCCM. |
| Quiescent Current | 300 µA (non-switching), 2 µA (shutdown) - minimizes battery drain in always-on standby circuits. |
| Feedback Reference | 0.596 V ±2.5% - sets output voltage accuracy; used with external resistor divider to configure 3.3 V, 5 V, or other regulated outputs. |
| Thermal Resistance | RθJA = 87.1°C/W - defines maximum power dissipation (≈1.15 W at ΔT = 100°C) in standard PCB layout with 2-oz copper. |
| Protection Features | Hiccup-mode OCP, OVP (118% trip / 104% reset), thermal shutdown (165°C), UVLO (4.1 V rising) - ensures robust field operation without external supervision. |
Pinout & Package
SOT-23 (6) package, 1.60 mm × 2.90 mm body size, with exposed pad not electrically connected - optimized for compact layouts and moderate thermal dissipation in space-constrained consumer and industrial modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Power and signal ground reference | Return path for low-side MOSFET source and controller circuitry; must be connected to single-point ground near FB to minimize noise coupling. |
| SW (Pin 2) | Switch node | Connection point between high- and low-side MOSFETs; routes high dv/dt switching waveform - requires tight layout with minimal trace length and area. |
| VIN (Pin 3) | Main input supply | Drain terminal of high-side MOSFET; accepts 4.5–28 V; requires local 10-µF ceramic + 0.1-µF high-frequency decoupling. |
| FB (Pin 4) | Feedback input | Monitors output voltage via resistor divider; internal 0.596-V reference sets regulation point; sensitive to noise - route away from SW and GND loops. |
| EN (Pin 5) | Enable control | Logic-level input (1.28 V threshold); floating enables operation; 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 - eliminates external FETs and drivers, reducing BOM count and layout complexity for 3-A buck designs. |
| Internal Compensation | Complete Type-II compensation network embedded - removes need for external compensation components, accelerating design cycle. |
| FCCM Operation | Forced continuous conduction across full load range - prevents frequency foldback into audible band (20–20 kHz), critical for noise-sensitive audio subsystems. |
| Pre-Biased Start-Up | Safe monotonic startup into pre-charged output - avoids reverse current flow through low-side FET, protecting downstream capacitors and LDOs. |
| Integrated Boot Diode | Eliminates external bootstrap diode - simplifies layout, reduces component count, and improves reliability in high-volume consumer applications. |
Applications
| Printer Power Supply | STB/DTV Core Rail |
|---|---|
|
Use Scenario: Provides stable 3.3-V or 5-V rail for main SoC, memory, and interface logic in inkjet/laser printers with 12-V or 24-V input bus. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering 3-A continuous current; fixed 350-kHz switching ensures predictable EMI profile during motor actuation bursts. Use Value: Integrated MOSFETs and internal compensation reduce solution size by >30% vs discrete controllers; FCCM prevents audible coil whine during standby-to-active transitions. |
Use Scenario: Generates clean 3.3-V core voltage for broadcast SoCs and tuners in set-top boxes and digital TVs powered from 12-V wall adapters. IC Role / Device Role / Timing Role: Main point-of-load converter with tight output regulation (±2.5% ref tolerance) and fast transient response to handle video decode load spikes. Use Value: 2-μA shutdown current extends standby battery life; overvoltage protection (118% trip) safeguards sensitive HDMI and tuner ICs during hot-swap events. |
| White Goods Control Board | Industrial 24-V Bus Converter |
|
Use Scenario: Supplies 5-V logic rail for microcontrollers and sensors in washing machines, refrigerators, and dishwashers using 24-V system bus. IC Role / Device Role / Timing Role: Robust DC/DC stage with thermal shutdown (165°C) and hiccup-mode OCP - withstands ambient temperatures up to 85°C in enclosed cabinets. Use Value: SOT-23 package enables placement near MCU on compact control boards; 4.5-V UVLO ensures reliable start-up even with brownout conditions on aging 24-V supplies. |
Use Scenario: Converts 24-V factory floor distribution bus to 3.3-V or 5-V for PLC I/O modules, sensor interfaces, and communication peripherals. IC Role / Device Role / Timing Role: High-efficiency (≥90% at 2 A, VIN=24 V, VOUT=5 V) buck converter operating in FCCM to maintain EMC compliance across variable load profiles. Use Value: RθJA = 87.1°C/W allows >1 W dissipation on standard FR4 without heatsink; EN pin enables remote power sequencing with programmable delay via RC network. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2307DN-LF-Z | 3-A, 4.5–26 V input, 500-kHz switching, no internal soft-start timer; requires external compensation. | Lacks FCCM - enters DCM at light load, increasing output ripple; higher EMI variability. | Choose when cost sensitivity outweighs ripple and acoustic noise requirements; verify loop stability with external compensation. |
| LMR14030ADDAR | 3-A, 4–40 V input, 400-kHz switching, adjustable soft-start, external compensation, higher RDS(on) (110 mΩ HS / 60 mΩ LS). | Broad input range suits 36-V automotive systems; lower efficiency at 24-V input due to higher conduction loss. | Prefer for 36-V tolerant designs or where adjustable soft-start timing is mandatory; accept larger thermal footprint. |
Compared with MP2307DN-LF-Z and LMR14030ADDAR, the TPS54308DDCR offers superior acoustic noise performance via FCCM, lowest quiescent current (2 µA), and smallest solution size due to integrated compensation and boot diode - making it optimal for space- and noise-constrained consumer electronics.
Availability
TPS54308DDCR is available at Aetrix Electronics and suitable for printer power supplies, STB/DTV core rails, white goods control boards, industrial 24-V bus converters, and audio subsystems requiring stable component supply across production lifecycles.
Supply support for TPS54308DDCR 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 technologies, with decades of expertise in high-reliability power conversion ICs.
The TPS54308DDCR belongs to TI's SWIFT™ family of integrated DC/DC converters, designed specifically for compact, high-efficiency point-of-load regulation in consumer, industrial, and computing applications where board space and thermal constraints are critical.
FAQ
What is the minimum input voltage required for TPS54308DDCR to start switching?
The TPS54308DDCR begins switching when the input voltage reaches the rising UVLO threshold of 4.1 V (typical). Below this level, the device remains disabled regardless of EN pin state. The UVLO hysteresis is 480 mV, so the device sustains operation down to 3.6 V before shutting off - ensuring stable startup from weak or aged 12-V supplies.
Can TPS54308DDCR safely start up into a pre-biased output?
Yes, the TPS54308DDCR supports safe monotonic start-up into pre-biased outputs. During startup, both high-side and low-side MOSFETs remain off until the internal soft-start voltage exceeds the FB pin voltage - preventing reverse current flow through the low-side FET and protecting downstream capacitors and regulators.
What is the purpose of the BOOT pin on TPS54308DDCR, and what capacitor value is required?
The BOOT pin supplies gate drive voltage to the high-side MOSFET via a bootstrap capacitor connected between BOOT and SW. A 0.1-µF X7R or X5R ceramic capacitor is required; its voltage rating must exceed the input voltage. This capacitor recharges each switching cycle and is monitored by an internal UVLO (2.1 V typical) to disable the high-side FET if undercharged.
How does TPS54308DDCR implement overvoltage protection?
The TPS54308DDCR uses an internal overvoltage comparator that monitors the FB pin. When the feedback voltage exceeds 118% of the 0.596-V reference (≈703 mV), the high-side MOSFET is immediately turned off and held off until FB falls below 104% of VREF (≈620 mV). This protects downstream 3.3-V or 5-V logic from transient overshoot during load dump or fault recovery.
Is external compensation required for TPS54308DDCR stability?
No, the TPS54308DDCR includes fully integrated Type-II loop compensation. No external compensation components are needed - the internal network is optimized for standard output capacitor ESR and inductor values used in typical 3-A buck designs. This eliminates tuning effort and reduces PCB area versus controllers requiring external RC networks.
TPS54308DDCR 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
TPS54308DDCR FAQ
1.How can I place an order for TPS54308DDCR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54308DDCR 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 TPS54308DDCR reliable?
The price and inventory of TPS54308DDCR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54308DDCR is usually 5 days.
3.What payment methods are accepted for TPS54308DDCR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54308DDCR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54308DDCR?
TPS54308DDCR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54308DDCR 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 TPS54308DDCR?
For technical support, including TPS54308DDCR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54308DDCR requirements.
6.How does Aetrix verify that TPS54308DDCR is sourced from the original manufacturer or authorized distributors?
All TPS54308DDCR 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 TPS54308DDCR meets industry standards.
7.What is the process for return or replacement of TPS54308DDCR?
All TPS54308DDCR units undergo pre-shipment inspection (PSI). If there is an issue with TPS54308DDCR, 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 TPS54308DDCR part is unused and in its original packaging.
Return procedure for TPS54308DDCR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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