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Texas Instruments TPS54329EDDAR
- Part No.:
- TPS54329EDDAR
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS54329EDDAR.pdf
- Description:
- IC REG BUCK ADJ 3A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:5,089
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Product details
Overview
TPS54329EDDAR from Texas Instruments is a 3-A synchronous step-down DC/DC converter with integrated high-side and low-side N-channel MOSFETs, operating from 4.5 V to 18 V input and delivering adjustable output voltage from 0.76 V to 7.0 V. It employs D-CAP2™ adaptive on-time control for fast transient response, supports ceramic output capacitors, and features Eco-mode™ for high efficiency at light loads - ideal for digital TV power supplies and networking terminal applications.
For engineers reviewing the TPS54329EDDAR datasheet, TPS54329EDDAR pinout, TPS54329EDDAR application, or TPS54329EDDAR equivalent, key selection considerations include its 650-kHz pseudo-fixed switching frequency, 100 mΩ/74 mΩ integrated FET RDS(on), cycle-by-cycle overcurrent protection, thermal shutdown at 165°C, and compatibility with pre-biased soft-start in embedded power rail designs.
Technical Context
The TPS54329EDDAR implements D-CAP2™ mode control using an adaptive on-time PWM architecture that eliminates external compensation components while maintaining stability with ultra-low-ESR ceramic output capacitors. Its internal one-shot timer sets on-time based on VIN and VOUT, enabling pseudo-constant 650-kHz operation across input and load variations.
Eco-mode™ enables automatic transition from PWM to pulse-skipping operation below ~300 mA load, reducing quiescent current to <10 µA in shutdown and sustaining >85% efficiency at 10 mA output. Protection includes valley-current-based cycle-by-cycle OCP, non-latching UVLO (3.75 V), and thermal shutdown with 35°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 - sufficient for powering SoCs, FPGAs, and DDR memory subsystems in compact designs. |
| Switching Frequency | 650 kHz nominal - enables use of small 1.5–3.3 µH inductors and reduces EMI filter size without compromising transient response. |
| FET RDS(on) | 100 mΩ (HS) / 74 mΩ (LS) - minimizes conduction loss and improves full-load efficiency up to 95% at 1.8 V/2 A. |
| VFB Reference Accuracy | ±1.7% (749–781 mV) - ensures tight output regulation across temperature and line/load conditions. |
| Soft-Start Current | 6.0 µA typical - allows precise control of ramp time via external SS capacitor (e.g., 100 nF → ~18 ms start-up). |
| Shutdown Current | 4.3–10 µA - enables ultra-low-power system standby states in battery-backed or energy-conscious applications. |
Pinout & Package
The TPS54329EDDAR is housed in an 8-pin SO PowerPAD™ (DDA) package with exposed thermal pad, rated for –40°C to +85°C operation. The thermally enhanced layout requires soldering the exposed pad directly to PCB ground plane for optimal junction-to-board thermal resistance (θJB = 31.8°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VBST | Bootstrap supply for high-side gate driver | Must be decoupled with 0.1 µF ceramic capacitor to SW; enables 100% duty cycle capability and proper HS FET turn-on. |
| VIN | Main input power supply | Connects to bulk and high-frequency input capacitors; feeds internal LDO (VREG5) and gate drivers. |
| SW | Switch node | Connection point between integrated HS and LS FETs; requires minimal trace area to reduce EMI and ringing. |
| GND | Power ground return | Single-point analog/power ground tie recommended; thermal pad must be soldered to PGND plane. |
| VFB | Feedback input | Senses output voltage via resistor divider; high-impedance input (±0.1 µA) enables precision regulation with 1% resistors. |
| VREG5 | Internal 5.5-V LDO output | Powers internal circuitry; requires 0.47 µF ceramic capacitor to GND; inactive when EN = low. |
| EN | Enable control | Active-high logic input (1.6 V threshold); internal 220–880 kΩ pull-down enables default disable if left floating. |
| SS | Soft-start timing | 6 µA current source charges external capacitor; supports pre-biased startup by modulating LS FET gate drive. |
Key Features
| Feature | Design Value |
|---|---|
| D-CAP2™ adaptive on-time control | Eliminates external compensation network while supporting ceramic output capacitors down to 20 µF - reduces BOM count and layout sensitivity. |
| Eco-mode™ light-load optimization | Reduces switching losses below ~300 mA, maintaining >88% efficiency at 10 mA output - critical for always-on system rails. |
| Pre-biased soft-start | Prevents reverse current flow during startup into pre-charged outputs by gradually enabling LS FET conduction - avoids output voltage droop or overshoot. |
| Cycle-by-cycle overcurrent protection | Monitors low-side FET voltage during conduction to detect peak inductor current; triggers immediate off-time extension - protects against short-circuit and overload. |
| Integrated 5.5-V VREG5 LDO | Provides stable bias for internal logic and gate drivers; eliminates need for external bias supply - simplifies system power architecture. |
Applications
| Digital TV Power Supply | High Definition Blu-ray Disc™ Player |
|---|---|
Use Scenario: Powers main SoC core voltage (1.05–1.2 V) and memory I/O rails (1.8 V, 3.3 V) from 12-V DC input. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering tightly regulated, low-noise DC output with fast load-step response. Use Value: D-CAP2™ control achieves <50 mV output deviation under 2-A step load, eliminating need for large bulk capacitance. | Use Scenario: Supplies HDMI PHY, video decoder, and servo motor control circuits in optical disc players. IC Role / Device Role / Timing Role: Secondary buck converter generating 2.5-V and 3.3-V rails with low standby current for sleep-mode operation. Use Value: Eco-mode™ reduces no-load input current to <10 µA, extending battery backup runtime during standby. |
| Networking Home Terminal | Digital Set Top Box (STB) |
Use Scenario: Provides 1.8-V core voltage for broadband gateway processors handling DOCSIS or DSL protocols. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator with thermal shutdown and UVLO for unattended deployment. Use Value: 165°C thermal shutdown with 35°C hysteresis prevents latch-up during sustained ambient temperatures up to 85°C. | Use Scenario: Generates 1.05-V DDR3 memory supply and 1.2-V processor core rail from 12-V wall adapter input. IC Role / Device Role / Timing Role: Dual-output capable buck controller (with external feedback dividers) supporting multiple voltage domains. Use Value: Adjustable soft-start (via SS pin) ensures monotonic rise of all rails, preventing reset glitches during cold boot. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54328EDDAR | Same DDA package and pinout; identical 4.5–18 V input but fixed 1.2-V output (non-adjustable) | Limited to single-rail 1.2-V applications; no external feedback required | Select when fixed 1.2-V output suffices and board space for feedback resistors must be minimized. |
| MP2332HGRT-Z | 3-A, 4.5–18 V input, adjustable 0.8–6.5 V output; 500-kHz fixed frequency; different pinout and package (QFN-10) | Requires PCB redesign due to QFN-10 footprint and relocated EN/VFB pins; lacks pre-biased soft-start | Choose only if higher thermal performance (θJA = 35°C/W) and smaller package are prioritized over design reuse. |
Compared with TPS54329EDDAR, TPS54328EDDAR offers drop-in replacement for 1.2-V rails but sacrifices adjustability, while MP2332HGRT-Z provides better thermal metrics yet demands layout revision and loses pre-biased startup - making TPS54329EDDAR optimal for flexible, multi-rail, production-ready designs requiring reliability and feature completeness.
Availability
TPS54329EDDAR 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 lifecycle support, and consistent parametric performance across manufacturing lots.
Supply support for TPS54329EDDAR 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 ICs, with decades of expertise in high-efficiency DC/DC conversion.
The TPS54329E product line delivers cost-effective, low-component-count synchronous buck regulators targeting consumer and industrial power rails where fast transient response, ceramic-capacitor compatibility, and light-load efficiency are critical.
FAQ
What is the maximum output current capability of the TPS54329EDDAR?
The TPS54329EDDAR delivers up to 3 A continuous output current under recommended operating conditions (TA ≤ 85°C, proper PCB thermal design). Its integrated 100 mΩ high-side and 74 mΩ low-side MOSFETs enable this rating with peak efficiency exceeding 95% at 1.8 V/2 A. Derating applies above 85°C ambient or with insufficient copper area on the thermal pad.
Does the TPS54329EDDAR support pre-biased output startup?
Yes, the TPS54329EDDAR includes proprietary pre-biased soft-start functionality. When the output voltage is already present at startup, the controller incrementally enables the low-side FET gate drive to avoid sinking current from the pre-charged rail. This ensures monotonic output voltage ramp-up and prevents system reset or latch-up during hot-insertion scenarios.
What package type and thermal characteristics does the TPS54329EDDAR use?
The TPS54329EDDAR uses the 8-pin SO PowerPAD™ (DDA) package with exposed thermal pad. Its junction-to-board thermal resistance (θJB) is 31.8°C/W when the pad is soldered to a 1-in² 2-oz copper plane with six thermal vias. This enables reliable 3-A operation at 85°C ambient without forced airflow, provided layout follows TI's PowerPAD™ guidelines.
How does Eco-mode™ improve light-load efficiency in the TPS54329EDDAR?
Eco-mode™ in the TPS54329EDDAR automatically transitions from fixed-frequency PWM to pulse-skipping operation below ~300 mA load. This reduces switching losses while maintaining regulation, achieving >88% efficiency at 10 mA output and <10 µA shutdown current. Unlike burst-mode converters, it avoids audible noise and output voltage ripple spikes.
Can the TPS54329EDDAR operate with ceramic output capacitors only?
Yes, the TPS54329EDDAR is specifically optimized for ceramic output capacitors, including ultra-low-ESR types. Its D-CAP2™ control architecture eliminates the need for ESR-induced output ripple used by traditional voltage-mode controllers. Recommended values range from 20 µF to 68 µF total capacitance, with typical designs using three 10-µF X5R ceramics in parallel.
TPS54329EDDAR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- D-CAP2™, Eco-Mode™
- 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:
- 650kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
TPS54329EDDAR FAQ
1.How can I place an order for TPS54329EDDAR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54329EDDAR 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 TPS54329EDDAR reliable?
The price and inventory of TPS54329EDDAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54329EDDAR is usually 5 days.
3.What payment methods are accepted for TPS54329EDDAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54329EDDAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54329EDDAR?
TPS54329EDDAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54329EDDAR 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 TPS54329EDDAR?
For technical support, including TPS54329EDDAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54329EDDAR requirements.
6.How does Aetrix verify that TPS54329EDDAR is sourced from the original manufacturer or authorized distributors?
All TPS54329EDDAR 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 TPS54329EDDAR meets industry standards.
7.What is the process for return or replacement of TPS54329EDDAR?
All TPS54329EDDAR units undergo pre-shipment inspection (PSI). If there is an issue with TPS54329EDDAR, 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 TPS54329EDDAR part is unused and in its original packaging.
Return procedure for TPS54329EDDAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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