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Texas Instruments TPS54327DDA
- Part No.:
- TPS54327DDA
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS54327DDA.pdf
- Description:
- IC REG BUCK ADJ 3A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:1,359
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Product details
Overview
TPS54327DDA 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 operation across 4.5 V to 18 V input for generating stable 0.76 V–7 V outputs in digital TV power supplies.
For engineers reviewing the TPS54327DDA datasheet, TPS54327DDA pinout, TPS54327DDA application, or TPS54327DDA equivalent, key selection considerations include its ceramic-capacitor-compatible D-CAP2 control loop, prebiased soft-start capability, cycle-by-cycle overcurrent protection, thermal shutdown at 165°C, and HSOP-8 PowerPAD package thermal performance (RθJA = 42.1°C/W).
Technical Context
The TPS54327DDA 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 without an oscillator.
It integrates dual N-FETs (100 mΩ HS / 70 mΩ LS), a 5.5-V LDO (VREG5) with ±25 mV line/load regulation, adjustable soft-start via external capacitor, and non-latching protections including UVLO (3.6 V typical wakeup), cycle-by-cycle OCP (4.2 A typ), and thermal shutdown (165°C threshold, 30°C hysteresis).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 18 V - supports wide industrial and consumer DC bus inputs including 5 V, 12 V, and 15 V rails. |
| Output Current | 3 A continuous - delivers full rated load without derating at 85°C ambient with proper PCB thermal design. |
| Switching Frequency | 700 kHz - enables compact magnetics and filtering while balancing efficiency and EMI performance. |
| FET RDS(on) | 100 mΩ (HS) / 70 mΩ (LS) - minimizes conduction loss and improves full-load efficiency (>90% typical at 12 VIN/1.05 VOUT/2 A). |
| VFB Reference Accuracy | ±1.5 mV (749–781 mV) - ensures tight output voltage regulation (<±1.5% over temp and line). |
| Soft-Start Control | Adjustable via external capacitor - prevents inrush current and enables controlled ramp-up even with prebiased outputs. |
| Shutdown Current | <10 μA - supports ultra-low-power system standby modes without auxiliary regulators. |
Pinout & Package
TPS54327DDA uses an 8-pin HSOP package with exposed PowerPAD (4.89 mm × 3.90 mm), requiring soldering of the thermal pad to PCB ground for optimal thermal performance (RθJB = 31.8°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | Enable input | Active-high logic control (1.6 V threshold); enables/disables converter with <10 μA shutdown current. |
| VFB | Feedback input | Monitors output via resistor divider; 765 mV reference enables precise output programming from 0.76 V to 7 V. |
| VREG5 | Internal 5.5-V LDO output | Powers gate drivers and internal circuitry; requires 1-μF ceramic bypass to GND; inactive when EN = low. |
| SS | Soft-start control | Sinks 2 μA to charge external capacitor; sets startup time and enables prebiased start-up sequencing. |
| GND | Power ground return | Common return for switching path (PGND) and signal references (SGND); must tie SS/VFB returns at single point. |
| SW | Switch node | Connection between HS and LS FETs; carries high di/dt; requires low-inductance layout and 0.1-μF bootstrap cap to VBST. |
| VBST | Bootstrap supply | Charged via internal diode from VREG5; supplies HS gate drive; requires 0.1-μF ceramic cap to SW. |
| VIN | Main input supply | 4.5–18 V input rail; requires local 10-μF ceramic + bulk capacitance; connects to PowerPAD ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| D-CAP2™ adaptive on-time control | Enables stable operation with ceramic output capacitors without external compensation components, reducing BOM count and layout sensitivity. |
| Prebiased soft-start | Prevents reverse current flow during startup into precharged outputs by gradually enabling synchronous rectification via cycle-by-cycle low-side gate pulse extension. |
| Integrated 5.5-V VREG5 LDO | Self-powered gate driver supply eliminates need for external bias rail; delivers up to 60 mA with ±25 mV regulation over line/load. |
| Cycle-by-cycle overcurrent limit | Detects low-side FET voltage during conduction; provides fast, temperature-compensated current limiting with automatic recovery (non-latching). |
| Thermal shutdown with hysteresis | Shuts down at 165°C junction temperature and resumes operation only after cooling by ≥30°C, preventing thermal runaway in sustained overload. |
Applications
| Digital TV Power Supply | High Definition Blu-ray Disc™ Player |
|---|---|
Use Scenario: Powers SoC core voltage (1.05 V @ 2–3 A) and memory interface rails in flat-panel TV mainboards. IC Role / Device Role / Timing Role: Primary buck regulator delivering tightly regulated low-voltage, high-current output with fast transient response to dynamic CPU load steps. Use Value: D-CAP2™ control maintains <20 mV output deviation during 0–3 A load transients, eliminating need for large output capacitance. | Use Scenario: Supplies 1.8 V and 3.3 V rails to video decoder ASIC and HDMI transmitter in Blu-ray disc players. IC Role / Device Role / Timing Role: Dual-rail DC/DC converter supporting multiple low-noise analog and digital subsystems from single 12 V input. Use Value: Integrated VREG5 powers internal logic and gate drivers, removing dependency on external 5 V supply and simplifying power tree. |
| Networking Home Terminal | Digital Set Top Box (STB) |
Use Scenario: Generates 1.2 V core voltage for broadband gateway SoCs handling DOCSIS 3.0/3.1 packet processing. IC Role / Device Role / Timing Role: High-efficiency step-down regulator operating continuously under partial-load conditions with <10 μA shutdown current. Use Value: Less than 10 μA quiescent current extends battery backup runtime during AC loss events in residential gateways. | Use Scenario: Provides 2.5 V and 3.3 V outputs for QAM demodulator, MPEG decoder, and front-panel display in cable/satellite STBs. IC Role / Device Role / Timing Role: Main system power IC managing dynamic load changes during channel switching and DVR recording bursts. Use Value: Adjustable soft-start prevents brownout on shared 12 V input rail when multiple converters start simultaneously. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54328DDA | Same pinout, 4-A rating, 85 mΩ/55 mΩ FETs, identical D-CAP2™ control and features. | Higher output current capability; suitable where 3-A margin is insufficient or future-proofing required. | Select TPS54328DDA if peak load exceeds 3 A or long-term reliability margin demands lower thermal stress at same current. |
| MP2332GDD | 3-A, 4.5–18 V, 700-kHz, but uses constant-on-time (COT) control; no VREG5 LDO; different pinout (8-pin SOIC). | Lacks integrated bias rail; requires external 5 V for gate drive; less suited for systems needing self-contained operation. | Choose MP2332GDD only if board space allows SOIC footprint and external bias supply is already available. |
Compared with TPS54327DDA, TPS54328DDA offers higher current headroom in identical packaging, while MP2332GDD trades integration for cost and requires redesign of bias and layout-making TPS54327DDA optimal for compact, self-powered 3-A applications.
Availability
TPS54327DDA is available at Aetrix Electronics and suitable for digital TV power supplies, HD Blu-ray player designs, and networking home terminals requiring stable component supply with full production lifecycle support.
Supply support for TPS54327DDA 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 DC/DC conversion.
The TPS54327DDA belongs to TI's D-CAP2™ synchronous buck converter product line, engineered for cost-sensitive, space-constrained consumer and industrial systems demanding fast transient response and minimal external components.
FAQ
What is the maximum recommended output current for TPS54327DDA under continuous operation?
The TPS54327DDA is rated for 3 A continuous output current when mounted on a standard 4-layer PCB with the PowerPAD thermally connected to a 1-in² copper area. At 85°C ambient, full 3-A operation is achievable with RθJA = 42.1°C/W and typical power dissipation of ~0.6 W. Derating is required above 85°C ambient or with reduced copper area.
Does TPS54327DDA support ceramic output capacitors, and why is this important?
Yes, TPS54327DDA fully supports ceramic output capacitors due to its D-CAP2™ control architecture, which eliminates reliance on ESR-induced ripple for loop stability. This allows use of low-ESR, high-frequency ceramics (e.g., 22–68 µF X5R/X7R), reducing solution size, improving transient response, and lowering output voltage ripple compared to electrolytic or polymer alternatives.
How does the prebiased soft-start function work in TPS54327DDA?
The TPS54327DDA prebiased soft-start prevents reverse current flow when the output is already charged before startup. It does so by initially applying narrow low-side gate pulses and incrementally extending them cycle-by-cycle until reaching normal duty-cycle operation-ensuring smooth, monotonic VOUT ramp-up without sinking current from the precharged rail.
What is the purpose of the VREG5 pin on TPS54327DDA, and what load can it drive?
The VREG5 pin on TPS54327DDA provides a regulated 5.5-V output (±25 mV line/load regulation) to power internal gate drivers and control circuitry. It can deliver up to 60 mA and must be bypassed with a 1-μF ceramic capacitor to GND. VREG5 is disabled when EN = low, eliminating unnecessary bias consumption during shutdown.
Can TPS54327DDA operate with an input voltage below 4.5 V?
No, TPS54327DDA has a minimum recommended input voltage of 4.5 V per its absolute operating conditions. Below this, UVLO remains active (VREG5 wakeup threshold is ~3.6 V), and the device will not enable. Operation below 4.5 V risks failure to start or unstable regulation and is outside guaranteed specifications.
TPS54327DDA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- D-CAP2™
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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
TPS54327DDA FAQ
1.How can I place an order for TPS54327DDA through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54327DDA 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 TPS54327DDA reliable?
The price and inventory of TPS54327DDA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54327DDA is usually 5 days.
3.What payment methods are accepted for TPS54327DDA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54327DDA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54327DDA?
TPS54327DDA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54327DDA 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 TPS54327DDA?
For technical support, including TPS54327DDA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54327DDA requirements.
6.How does Aetrix verify that TPS54327DDA is sourced from the original manufacturer or authorized distributors?
All TPS54327DDA 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 TPS54327DDA meets industry standards.
7.What is the process for return or replacement of TPS54327DDA?
All TPS54327DDA units undergo pre-shipment inspection (PSI). If there is an issue with TPS54327DDA, 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 TPS54327DDA part is unused and in its original packaging.
Return procedure for TPS54327DDA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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