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Texas Instruments TPS561208DDCT
- Part No.:
- TPS561208DDCT
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
TPS561208DDCT.pdf
- Description:
- IC REG BUCK ADJ 1A SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:5,065
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Product details
Overview
TPS561208DDCT from Texas Instruments is a 1-A synchronous step-down DC-DC converter in a 6-pin SOT-23 (DDC) package, featuring D-CAP2™ mode control, 580-kHz fixed switching frequency, and continuous conduction mode (CCM) operation. It delivers regulated output voltages from 0.76 V to 7 V across a 4.5–17-V input range and supports pre-biased start-up for use in digital TV power supplies and STB applications.
For engineers reviewing the TPS561208DDCT datasheet, TPS561208DDCT pinout, TPS561208DDCT application, or TPS561208DDCT equivalent, key selection criteria include its integrated 140-mΩ/84-mΩ FETs, 2% feedback voltage accuracy at 25°C, hiccup-mode overcurrent protection, non-latching thermal shutdown (160°C), and 1-ms fixed soft-start timing - all validated for industrial temperature operation (–40°C to 125°C junction).
Technical Context
The TPS561208DDCT employs adaptive on-time D-CAP2™ control with internal compensation, enabling stable operation with low-ESR ceramic or polymer output capacitors without external loop components. Its quasi-fixed 580-kHz switching frequency is maintained via VIN- and VOUT-dependent one-shot timer modulation.
Unlike the pulse-skip TPS561201, the TPS561208 operates exclusively in continuous conduction mode (CCM), delivering consistent ripple performance and predictable transient response across load ranges. Protection features include cycle-by-cycle overcurrent limiting, non-latching undervoltage lockout (UVLO), and thermal shutdown with 25°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 17 V - supports wide-input industrial and consumer DC rails including 5 V, 9 V, 12 V, and 15 V supply buses. |
| Output Voltage Range | 0.76 V to 7 V - programmable via external resistor divider; enables core voltage regulation for SoCs, FPGAs, and microcontrollers. |
| Switching Frequency | 580 kHz - fixed quasi-constant frequency simplifies EMI filtering and inductor selection; stable across input and load variations. |
| Output Current | 1 A continuous - sufficient for powering DDR memory, video processors, and peripheral ICs in compact embedded systems. |
| Feedback Accuracy | ±2% at 25°C - ensures tight output regulation under nominal conditions; critical for sensitive analog and digital loads. |
| Shutdown Current | <10 µA - enables ultra-low-power standby states in battery-backed or energy-conscious designs. |
| Soft-Start Time | 1.0 ms - internal ramp prevents inrush current and output overshoot during power-up sequences. |
| Thermal Shutdown | 160°C with 25°C hysteresis - protects against sustained overload or poor PCB thermal design without latching. |
Pinout & Package
The TPS561208DDCT is housed in a 6-pin SOT-23 (DDC) package measuring 1.6 mm × 2.9 mm, optimized for high-density PCB layouts and thermally constrained applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Ground reference | Common return path for controller logic and low-side FET source; must be connected to single-point ground near VFB for stability. |
| SW | Switch node | Connection between high- and low-side internal FETs; requires low-inductance layout and direct connection to bootstrap capacitor. |
| VIN | Input supply | Main power input (4.5–17 V); feeds high-side FET drain and internal LDO; requires local 10-µF ceramic decoupling. |
| VFB | Feedback input | Monitors output voltage via resistor divider; 0.768-V internal reference enables precise output programming with 1% resistors. |
| EN | Enable control | Active-high logic input (1.6 V threshold); allows system-level power sequencing and standby control. |
| VBST | Bootstrap supply | Provides gate drive voltage for high-side FET; requires 0.1-µF ceramic capacitor tied directly to SW pin. |
Key Features
| Feature | Design Value |
|---|---|
| D-CAP2™ control architecture | Enables stable regulation with zero-ESR ceramic capacitors and eliminates need for external compensation network. |
| Integrated power FETs | 140-mΩ high-side and 84-mΩ low-side MOSFETs reduce BOM count and improve efficiency at 1-A load. |
| Hiccup-mode overcurrent protection | Shuts down and auto-restarts after 15 ms upon current limit violation, preventing thermal runaway during short-circuit events. |
| Pre-biased output start-up | Allows safe ramp-up when output capacitor is pre-charged, avoiding reverse current flow into downstream circuitry. |
| Non-latching UVLO and TSD | Resumes normal operation automatically after input voltage or temperature returns to safe operating range. |
Applications
| Digital TV Power Supply | High-Definition Blu-ray™ Disc Player |
|---|---|
Use Scenario: Supplies 1.05-V core voltage to MPEG decoder SoC and HDMI transmitter ICs under dynamic video decoding loads. IC Role / Device Role / Timing Role: Primary point-of-load regulator delivering tightly regulated 1-A output with fast transient response to handle bursty video processing currents. Use Value: D-CAP2™ control reduces required output capacitance by >30% versus traditional PWM controllers, saving board space and cost. | Use Scenario: Powers 3.3-V USB PHY, 1.8-V servo motor controller, and 1.2-V flash memory interface in optical disc drive subsystems. IC Role / Device Role / Timing Role: Multi-rail DC-DC converter supporting mixed-voltage domain operation with independent enable control per rail. Use Value: 580-kHz switching frequency enables use of small 2.2-µH inductors and avoids audible noise in consumer audio environments. |
| Digital Set-Top Box (STB) | Surveillance System Camera Module |
Use Scenario: Generates 1.2-V CPU core and 3.3-V I/O supply from 12-V wall adapter in cable/satellite receiver enclosures. IC Role / Device Role / Timing Role: High-efficiency buck converter operating continuously across ambient temperatures up to 70°C in sealed plastic housings. Use Value: Continuous conduction mode (CCM) ensures consistent ripple spectrum for EMI compliance in FCC Class B environments. | Use Scenario: Provides 1.05-V image sensor bias and 2.5-V analog front-end supply in IP camera modules mounted in outdoor enclosures. IC Role / Device Role / Timing Role: Robust power management IC rated for –40°C to 125°C junction temperature, supporting extended thermal cycling. Use Value: Non-latching thermal shutdown and UVLO allow automatic recovery after temporary overheating or brownout events in unattended deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS561201DDCT | Pulse-skip Eco-mode instead of CCM; lower light-load quiescent current (380 µA vs 590 µA typical); identical pinout and package. | Better suited for always-on, low-duty-cycle systems where standby efficiency dominates; less suitable for constant-load video processing. | Select TPS561201DDCT only if light-load efficiency below 10 mA is critical; otherwise TPS561208DDCT provides more predictable ripple and transient behavior. |
| MP2315DJ-LF-Z | Monolithic 2-A buck with 3.3–18-V input, 500-kHz switching, but no pre-biased start-up or D-CAP2™; uses current-mode control. | Higher current rating suits dual-rail applications; lacks hiccup-mode OCP and fixed soft-start, requiring external fault handling. | Choose MP2315DJ-LF-Z when >1-A output or wider input range is needed; accept added complexity for compensation and protection. |
Compared with TPS561201DDCT and MP2315DJ-LF-Z, the TPS561208DDCT uniquely balances CCM stability, D-CAP2™ simplicity, and industrial-grade protection - making it optimal for fixed-output, medium-current consumer electronics where layout area and design cycle time are constrained.
Availability
TPS561208DDCT is available at Aetrix Electronics and suitable for digital TV power supplies, high-definition Blu-ray™ disc players, and digital set-top box (STB) applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for TPS561208DDCT 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 TPS56120x product line was developed specifically for space-constrained, cost-sensitive consumer electronics requiring simple, high-efficiency DC-DC conversion without external compensation - targeting digital TV, STB, and optical disc player markets.
FAQ
What is the maximum output current capability of the TPS561208DDCT?
The TPS561208DDCT is rated for 1-A continuous output current under recommended operating conditions (TJ ≤ 125°C, VIN = 12 V, VOUT = 1.05 V). Peak current limit is specified at 1.2–2.0 A depending on test conditions, but sustained operation above 1 A requires careful thermal design due to RθJA = 90.8°C/W in the SOT-23 package.
Does the TPS561208DDCT support pre-biased output start-up?
Yes, the TPS561208DDCT supports pre-biased output start-up. When the EN pin is asserted high while the output capacitor holds residual voltage, the device delays switching until the internal soft-start reference exceeds the existing VFB voltage - preventing reverse current flow and ensuring controlled ramp-up.
What is the purpose of the VBST pin on the TPS561208DDCT?
VBST on the TPS561208DDCT supplies gate drive voltage to the internal high-side MOSFET. It must be connected to the SW node through a 0.1-µF ceramic capacitor to generate the boosted voltage required for full enhancement of the high-side switch during each switching cycle.
How does the TPS561208DDCT differ from the TPS561201DDCT in functional operation?
The TPS561208DDCT operates exclusively in continuous conduction mode (CCM) at 580 kHz, while the TPS561201DDCT uses pulse-skip Eco-mode at light loads. This makes the TPS561208DDCT more suitable for applications requiring consistent ripple frequency and predictable transient response, such as video processing circuits.
What protection features are integrated into the TPS561208DDCT?
The TPS561208DDCT integrates cycle-by-cycle overcurrent limiting, hiccup-mode fault recovery, non-latching thermal shutdown (160°C), non-latching undervoltage lockout (UVLO), and output undervoltage protection (UVP). These features operate autonomously without external components to safeguard both the IC and downstream circuitry.
TPS561208DDCT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SWIFT™
- 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):
- 17V
- Voltage - Output (Min/Fixed):
- 0.76V
- Voltage - Output (Max):
- 7V
- Current - Output:
- 1A
- Frequency - Switching:
- 580kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-THIN
TPS561208DDCT FAQ
1.How can I place an order for TPS561208DDCT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS561208DDCT 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 TPS561208DDCT reliable?
The price and inventory of TPS561208DDCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS561208DDCT is usually 5 days.
3.What payment methods are accepted for TPS561208DDCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS561208DDCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS561208DDCT?
TPS561208DDCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS561208DDCT 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 TPS561208DDCT?
For technical support, including TPS561208DDCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS561208DDCT requirements.
6.How does Aetrix verify that TPS561208DDCT is sourced from the original manufacturer or authorized distributors?
All TPS561208DDCT 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 TPS561208DDCT meets industry standards.
7.What is the process for return or replacement of TPS561208DDCT?
All TPS561208DDCT units undergo pre-shipment inspection (PSI). If there is an issue with TPS561208DDCT, 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 TPS561208DDCT part is unused and in its original packaging.
Return procedure for TPS561208DDCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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