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Texas Instruments TPS54327DDAR
- Part No.:
- TPS54327DDAR
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS54327DDAR.pdf
- Description:
- IC REG BUCK ADJ 3A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:5,608
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Product details
Overview
TPS54327DDAR from Texas Instruments is a 3-A synchronous step-down DC/DC converter with integrated high-side (100 mΩ) and low-side (70 mΩ) N-channel MOSFETs, D-CAP2™ adaptive on-time control, 700-kHz switching frequency, and 0.76 V to 7 V adjustable output voltage. It delivers fast transient response in digital TV power supplies and networking home terminals using ceramic output capacitors.
For engineers reviewing the TPS54327DDAR datasheet, TPS54327DDAR pinout, TPS54327DDAR application, or TPS54327DDAR equivalent, key selection considerations include input voltage range (4.5–18 V), shutdown current (<10 μA), thermal shutdown threshold (165°C), prebiased soft-start capability, and HSOP-8 PowerPAD™ package thermal performance (RθJA = 42.1°C/W).
Technical Context
The TPS54327DDAR implements D-CAP2™ mode control-a proprietary adaptive on-time PWM architecture that eliminates external compensation while maintaining stability with ultra-low-ESR ceramic output capacitors. Its internal one-shot timer sets on-time inversely proportional to VIN and proportional to VOUT, enabling pseudo-fixed 700-kHz operation across input and load variations.
Current protection uses cycle-by-cycle valley detection of low-side FET switch voltage, with temperature-compensated sensing and dual-level overcurrent limiting (3.5–5.7 A trip, 7-cycle latch-down). UVLO monitors VREG5 voltage (3.45–4.05 V threshold), and thermal shutdown activates at 165°C with 30°C hysteresis-both non-latching.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3 A continuous; supports peak loads up to 5.7 A before current-limit foldback |
| Input Voltage Range | 4.5 V to 18 V; enables direct use with 5 V, 12 V, and 15 V intermediate bus rails |
| Output Voltage Range | 0.76 V to 7 V; set via external resistor divider with 765 mV reference accuracy (±1.5 mV) |
| Switching Frequency | ~700 kHz; pseudo-constant via adaptive on-time control-no external clock required |
| FET RDS(on) | 100 mΩ (high-side), 70 mΩ (low-side); optimized for <50% duty cycle applications like 1.05 V/12 V conversion |
| Shutdown Current | <10 μA; enables ultra-low-power standby in always-on consumer electronics |
| Soft-Start | Adjustable via external capacitor; supports prebiased startup without sinking output current |
Pinout & Package
TPS54327DDAR is housed in an 8-pin HSOP (4.89 mm × 3.90 mm) with exposed PowerPAD™ thermal pad soldered to PCB ground for enhanced thermal dissipation (RθJB = 31.8°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | Enable input | Active-high logic control (1.6 V threshold); enables system-level power sequencing |
| VFB | Feedback input | Connects to resistor divider; senses output voltage against 765 mV internal reference |
| VREG5 | 5-V LDO output | Supplies gate drive and internal circuitry; requires 1-μF ceramic bypass to GND |
| SS | Soft-start control | Sinks 2 μA to charge external capacitor; sets ramp time and enables prebias-safe startup |
| GND | Power ground | Common return for switching path; must be star-connected with SS/VFB returns |
| SW | Switch node | Connection point between integrated high- and low-side FETs; drives external LC filter |
| VBST | Bootstrap supply | Charged via internal diode from VREG5; requires 0.1-μF ceramic cap to SW for high-side gate drive |
| VIN | Main input supply | Accepts 4.5–18 V; feeds both power stage and internal bias circuits |
Key Features
| Feature | Design Value |
|---|---|
| D-CAP2™ control mode | Enables stable operation with zero-ESR ceramic capacitors and eliminates external compensation network |
| Prebiased soft-start | Prevents reverse current flow during startup when output is already biased-critical for hot-swap and rail-sharing systems |
| Integrated FETs | Reduces BOM count and layout area; 100 mΩ/70 mΩ RDS(on) optimizes efficiency for 12 V→1.05 V conversion |
| Thermal shutdown | 165°C trip with 30°C hysteresis ensures safe operation under sustained overload or poor airflow |
| Low shutdown current | <10 μA allows battery-backed or energy-harvesting applications to maintain long standby life |
Applications
| Digital TV Power Supply | Networking Home Terminal |
|---|---|
Use Scenario: Powers SoC core voltage (1.05 V @ 3 A) and memory interface rails in 4K UHD television platforms. IC Role / Device Role / Timing Role: Primary buck regulator delivering tightly regulated low-voltage, high-current power with fast load-step response to handle video processing bursts. Use Value: D-CAP2™ control maintains <1% output deviation during 0–3 A load transients, reducing required output capacitance by 40% versus voltage-mode controllers. | Use Scenario: Supplies 1.8 V and 3.3 V rails for Ethernet PHY, Wi-Fi SoC, and USB controller in residential gateway devices. IC Role / Device Role / Timing Role: Secondary buck converter operating from 5 V or 12 V intermediate bus; provides isolated, ripple-sensitive power with minimal EMI. Use Value: 700-kHz fixed-frequency operation simplifies EMI filtering, while ceramic-capacitor compatibility eliminates electrolytic aging concerns in fanless enclosures. |
| Digital Set Top Box (STB) | High Definition Blu-ray Disc™ Player |
Use Scenario: Generates 1.2 V CPU core voltage and 1.5 V DDR3 termination voltage in compact STB designs with strict thermal limits. IC Role / Device Role / Timing Role: High-efficiency synchronous buck converter with forced CCM mode ensuring consistent regulation during deep-sleep wake-up cycles. Use Value: <10 μA shutdown current extends battery backup runtime; HSOP-8 PowerPAD™ enables 85°C ambient operation without heatsink. | Use Scenario: Delivers 2.5 V and 3.3 V to optical pickup unit, servo controller, and HDMI transmitter in space-constrained Blu-ray players. IC Role / Device Role / Timing Role: Main DC/DC regulator supporting rapid power-on sequencing and brownout recovery during disc spin-up surges. Use Value: Prebiased soft-start prevents output collapse when auxiliary rails power up first-ensuring deterministic boot behavior. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54328DDAR | Same pinout and D-CAP2™ control, but rated for 4.5 A output and higher RDS(on) (80 mΩ/50 mΩ) | Supports higher current loads; requires larger output inductor and capacitor sizing | Select when >3 A continuous output or tighter thermal margin is required |
| MP2332HG-10-LF-Z | Monolithic 3 A buck with 500 kHz fixed frequency, no prebiased soft-start, and different enable threshold (1.25 V) | Lacks D-CAP2™ transient performance and prebias capability; simpler compensation but lower light-load efficiency | Choose for cost-sensitive, non-prebias applications where 700-kHz switching is not mandatory |
Compared with TPS54327DDAR, TPS54328DDAR offers higher current headroom in identical footprint, while MP2332HG-10-LF-Z trades transient performance and startup flexibility for lower BOM cost and simplified design-making it suitable only where prebias safety and sub-100-ns load steps are not critical.
Availability
TPS54327DDAR is available at Aetrix Electronics and suitable for digital TV power supplies, networking home terminals, and digital set-top boxes requiring stable component supply, long-term industrial availability, and full traceability.
Supply support for TPS54327DDAR 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, designing analog and embedded processing chips for industrial, automotive, and consumer markets.
The TPS54327DDAR belongs to TI's D-CAP2™ synchronous buck converter product line, engineered specifically for high-efficiency, low-component-count point-of-load regulation in space- and thermally constrained consumer electronics.
FAQ
What is the maximum input voltage rating for the TPS54327DDAR?
The TPS54327DDAR has an absolute maximum VIN rating of 20 V, but its recommended operating input voltage range is strictly 4.5 V to 18 V per the datasheet. Exceeding 18 V during normal operation risks violating recommended conditions and may accelerate parametric drift or reduce reliability. The device includes internal UVLO that disables operation below ~3.6 V on VREG5, ensuring controlled startup within spec.
Does the TPS54327DDAR support prebiased soft-start, and how does it work?
Yes, the TPS54327DDAR supports prebiased soft-start. When the output is already at a valid voltage before EN assertion, the IC avoids sinking current by initially activating the low-side FET with narrow, incrementally widening pulses-only transitioning to full synchronous rectification once the feedback voltage aligns with the soft-start ramp. This prevents output voltage collapse and ensures clean, deterministic power-up in multi-rail systems where downstream regulators power up first.
What package type and thermal characteristics apply to the TPS54327DDAR?
The TPS54327DDAR uses the HSOP-8 (DDA) package with an exposed PowerPAD™ thermal pad on the underside. Its thermal metrics include RθJA = 42.1°C/W (JEDEC high-K board), RθJB = 31.8°C/W, and RθJC(bot) = 7.1°C/W. Proper soldering of the PowerPAD™ to a large PCB copper pour is mandatory to achieve these values and sustain 3 A continuous output at 85°C ambient.
Can the TPS54327DDAR operate with ceramic output capacitors only?
Yes-the TPS54327DDAR is explicitly designed for ceramic output capacitors via its D-CAP2™ control architecture. Unlike traditional voltage-mode controllers, it does not require ESR-induced ripple for stability. The datasheet confirms stable operation with 22 µF to 68 µF X5R/X7R ceramics (e.g., two 22 µF TDK C3216X5R0J226M units), eliminating need for bulk electrolytics and improving long-term reliability.
What is the function of the VBST pin on the TPS54327DDAR, and what capacitor is required?
The VBST pin supplies gate drive voltage to the high-side N-channel MOSFET. It is charged through an internal diode from the VREG5 output. A 0.1 µF ceramic capacitor must be placed directly between VBST and SW pins to provide local charge storage for high-side switching. TI specifies X7R or better dielectric; placement must minimize loop inductance, as improper VBST decoupling causes shoot-through or erratic switching.
TPS54327DDAR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- D-CAP2™
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm Width)
- 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):
- 18V
- Voltage - Output (Min/Fixed):
- 0.76V
- Voltage - Output (Max):
- 7V
- Current - Output:
- 3A
- Frequency - Switching:
- 700kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
TPS54327DDAR FAQ
1.How can I place an order for TPS54327DDAR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54327DDAR 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 TPS54327DDAR reliable?
The price and inventory of TPS54327DDAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54327DDAR is usually 5 days.
3.What payment methods are accepted for TPS54327DDAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54327DDAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54327DDAR?
TPS54327DDAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54327DDAR 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 TPS54327DDAR?
For technical support, including TPS54327DDAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54327DDAR requirements.
6.How does Aetrix verify that TPS54327DDAR is sourced from the original manufacturer or authorized distributors?
All TPS54327DDAR 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 TPS54327DDAR meets industry standards.
7.What is the process for return or replacement of TPS54327DDAR?
All TPS54327DDAR units undergo pre-shipment inspection (PSI). If there is an issue with TPS54327DDAR, 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 TPS54327DDAR part is unused and in its original packaging.
Return procedure for TPS54327DDAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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