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Texas Instruments TPS54328DDA
- Part No.:
- TPS54328DDA
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS54328DDA.pdf
- Description:
- IC REG BUCK ADJ 3A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:363
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Product details
Overview
TPS54328DDA from Texas Instruments is a 3-A synchronous step-down DC/DC converter in an 8-pin HSOP package, featuring D-CAP2™ adaptive on-time control, 700-kHz switching frequency, 4.5-V to 18-V input range, and 0.76-V to 7-V adjustable output voltage. It delivers high efficiency across load conditions using Eco-Mode™ for light-load operation and supports ceramic output capacitors with low ESR.
For engineers reviewing the TPS54328DDA datasheet, TPS54328DDA pinout, TPS54328DDA application, or TPS54328DDA equivalent, key selection considerations include its integrated 100-mΩ/70-mΩ MOSFETs, pre-biased soft-start capability, cycle-by-cycle overcurrent protection, thermal shutdown at 165°C, and –40°C to 85°C operating ambient temperature range.
Technical Context
The TPS54328DDA implements D-CAP2™ mode control-a proprietary adaptive on-time PWM architecture that eliminates external compensation while enabling fast transient response. Its internal one-shot timer sets on-time based on VIN and VOUT, yielding pseudo-fixed 700-kHz operation without an oscillator.
It operates in continuous conduction mode (CCM) under heavy loads and transitions seamlessly to discontinuous conduction mode (DCM) via Auto-Skip Eco-Mode™ at light loads. Protection features include valley-current-based cycle-by-cycle OCP, UVLO referenced to VREG5, and non-latching thermal shutdown at 165°C with 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 input rails including 5 V, 12 V, and 15 V systems. |
| Output Current | 3 A continuous - sufficient for powering core logic, FPGAs, DSPs, and SoCs in compact power supplies. |
| Switching Frequency | 700 kHz - enables small external inductors (e.g., 1.5 µH) and reduces output filter size without compromising EMI performance. |
| High-Side RDS(on) | 100 mΩ - minimizes conduction loss at high duty cycles, improving efficiency in low-VOUT applications. |
| Low-Side RDS(on) | 70 mΩ - reduces rectification loss during DCM, supporting high efficiency down to microamp-level loads via Eco-Mode™. |
| Feedback Reference | 0.765 V ±1.5% - enables precise output regulation with standard resistor dividers; supports 1.05 V, 1.2 V, 1.8 V, and other common logic supply voltages. |
| Shutdown Current | <10 µA - ensures ultra-low system standby power, critical for battery-backed or always-on embedded devices. |
Pinout & Package
TPS54328DDA uses an 8-pin HSOP (Heat Sink Overmolded Package) with 4.89 mm × 3.90 mm body size and exposed thermal pad on the backside, requiring solder connection to PCB ground plane for thermal management and electrical return.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 1) | Enable input | Active-high logic control; threshold at 1.6 V (min), 0.45 V (max) - compatible with 1.8-V, 3.3-V, and 5-V GPIOs. |
| VFB (Pin 2) | Feedback input | Monitors output voltage via resistor divider; 0.765-V reference enables accurate regulation with minimal offset error. |
| VREG5 (Pin 3) | Internal LDO output | 5.5-V regulated supply for gate drive and internal circuitry; requires 1-µF ceramic capacitor to GND; inactive when EN = low. |
| SS (Pin 4) | Soft-start control | Adjustable startup ramp via external capacitor; supports pre-biased outputs by delaying synchronous rectifier activation. |
| GND (Pin 5) | Power ground | Primary return path for switching current; must be connected to thermal pad and isolated from sensitive analog returns (VFB, SS). |
| SW (Pin 6) | Switch node | Connection point between high- and low-side MOSFETs; carries high dv/dt switching waveform - requires tight layout and Kelvin routing. |
| VBST (Pin 7) | Bootstrap supply | Charges high-side gate driver; requires 0.1-µF ceramic capacitor to SW - internal diode connects VREG5 to VBST during startup. |
| VIN (Pin 8) | Main input supply | Accepts 4.5–18 V; feeds internal regulator and power switches; requires local 10-µF ceramic + 0.1-µF decoupling per TI layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| D-CAP2™ Adaptive On-Time Control | Enables stable operation with zero external compensation components and supports both ceramic and polymer output capacitors. |
| Eco-Mode™ Auto-Skip Operation | Reduces switching losses at light loads by entering pulse-skipping mode, maintaining >85% efficiency down to 1 mA output current. |
| Integrated Power MOSFETs | 100-mΩ high-side and 70-mΩ low-side NFETs eliminate external discrete switches and simplify BOM and layout. |
| Pre-Biased Soft Start | Prevents reverse current flow during startup into pre-charged outputs - essential for hot-swap and multi-rail sequencing applications. |
| Cycle-by-Cycle Overcurrent Protection | Valley-current sensing on low-side FET provides accurate, temperature-compensated current limiting with 3.5–5.7 A trip range. |
Applications
| Consumer Set-Top Box Power | Digital TV Main Rail Supply |
|---|---|
Use Scenario: Powers video processing SoC and memory subsystems in digital cable/satellite STBs with 1.05-V core and 3.3-V I/O rails. IC Role / Device Role / Timing Role: Primary buck regulator delivering 3-A continuous current at 1.05 V with <50-mVPP ripple under dynamic load steps up to 2.25 A/µs. Use Value: D-CAP2™ control ensures sub-50-µs transient recovery, meeting strict HDMI and audio codec timing requirements without bulk capacitance. | Use Scenario: Supplies 1.2-V core and 1.8-V DDR interface rails in LCD/LED TVs with variable backlight dimming and HDMI hot-plug events. IC Role / Device Role / Timing Role: Dual-output implementation (using two TPS54328DDA units) providing independent, tightly regulated low-voltage rails with synchronized soft-start sequencing. Use Value: Pre-biased soft start prevents output voltage droop or reverse current during HDMI hot-plug transients, ensuring uninterrupted video handshake. |
| Home Networking Terminal PSU | Blu-ray Disc™ Player Logic Supply |
Use Scenario: Powers Ethernet PHY, Wi-Fi SoC, and flash memory in residential gateways and mesh routers with bursty data traffic patterns. IC Role / Device Role / Timing Role: High-efficiency 3.3-V rail generator operating in Eco-Mode™ during idle periods and transitioning to CCM during packet transmission bursts. Use Value: <10-µA shutdown current and >90% light-load efficiency extend standby runtime and reduce thermal load in sealed enclosures. | Use Scenario: Delivers 1.2-V core voltage to BD-ROM controller ASIC and 1.8-V interface to optical pickup unit in Blu-ray players. IC Role / Device Role / Timing Role: Synchronous buck converter handling rapid load changes during disc spin-up and laser calibration sequences. Use Value: 700-kHz switching and fast D-CAP2™ response limit output deviation to <20 mV during 1-A load steps, preventing firmware lockup or read errors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS543320RTWR | 10-pin VSON package, 4-A rating, 1-MHz fSW, higher RDS(on) (120 mΩ/80 mΩ), no Eco-Mode™ | Requires larger output capacitor for same ripple; better suited for higher-frequency, lower-inductance designs | Choose for higher current or space-constrained layouts where 4-A capability and smaller footprint outweigh light-load efficiency needs. |
| MP2332HG-LL-Z | Monolithic 3-A buck, 4.5–28-V input, 500-kHz fSW, no pre-biased soft start, 1.2-V fixed VREF | Lacks D-CAP2™ transient performance and pre-bias support; requires external compensation | Select when cost sensitivity dominates and design can tolerate slower transient response and simplified feedback network. |
Compared with TPS54328DDA, TPS543320RTWR offers higher current and frequency but sacrifices Eco-Mode™ efficiency at light loads, while MP2332HG-LL-Z trades transient performance and soft-start flexibility for lower BOM count and broader input range-making TPS54328DDA optimal for balanced efficiency, responsiveness, and ease of use in mid-power consumer electronics.
Availability
TPS54328DDA is available at Aetrix Electronics and suitable for digital TV power supplies, high-definition Blu-ray Disc™ players, and networking home terminals requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for TPS54328DDA 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 and system-level power architecture.
The TPS54328DDA belongs to TI's D-CAP2™ synchronous buck converter family, designed specifically for cost-sensitive, space-constrained consumer electronics requiring fast transient response, ultra-low standby power, and seamless light-to-heavy load efficiency scaling.
FAQ
What is the maximum recommended output current for TPS54328DDA in continuous operation?
The TPS54328DDA is rated for 3-A continuous output current under recommended operating conditions (TA = –40°C to 85°C, proper PCB thermal design). Its overcurrent protection triggers at 3.5–5.7 A depending on temperature and layout, but sustained operation above 3 A requires derating based on junction temperature rise and thermal pad soldering quality.
Does TPS54328DDA support pre-biased output startup?
Yes, the TPS54328DDA includes proprietary pre-biased soft-start circuitry. When the output voltage is already present at startup, the device delays activation of the low-side FET and gradually increases its on-time cycle-by-cycle, preventing reverse current flow and ensuring monotonic VOUT ramp-up without droop or overshoot.
What package type and thermal characteristics apply to TPS54328DDA?
TPS54328DDA uses the 8-pin HSOP (DDA) package with 4.89 mm × 3.90 mm body size and an exposed thermal pad on the underside. Its junction-to-board thermal resistance (RθJB) is 31.8°C/W, and it requires soldering the thermal pad to a minimum 100-mm² copper area connected to GND for reliable 3-A operation at 85°C ambient.
Can TPS54328DDA operate with ceramic output capacitors only?
Yes, the TPS54328DDA is explicitly optimized for ceramic output capacitors. Its D-CAP2™ control architecture eliminates reliance on ESR-induced ripple for stability, allowing use of ultra-low-ESR ceramics (e.g., X5R/X7R 22–68 µF) without phase compensation networks or damping resistors.
What is the purpose of the VREG5 pin on TPS54328DDA?
The VREG5 pin on TPS54328DDA provides a regulated 5.5-V output used internally to power the high-side gate driver and control circuitry. It sources up to 10 mA and requires a 1-µF ceramic capacitor to GND. VREG5 is disabled when EN is low, reducing system standby current to <10 µA.
TPS54328DDA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- D-CAP2™, Eco-Mode™
- 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
TPS54328DDA FAQ
1.How can I place an order for TPS54328DDA through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54328DDA 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 TPS54328DDA reliable?
The price and inventory of TPS54328DDA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54328DDA is usually 5 days.
3.What payment methods are accepted for TPS54328DDA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54328DDA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54328DDA?
TPS54328DDA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54328DDA 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 TPS54328DDA?
For technical support, including TPS54328DDA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54328DDA requirements.
6.How does Aetrix verify that TPS54328DDA is sourced from the original manufacturer or authorized distributors?
All TPS54328DDA 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 TPS54328DDA meets industry standards.
7.What is the process for return or replacement of TPS54328DDA?
All TPS54328DDA units undergo pre-shipment inspection (PSI). If there is an issue with TPS54328DDA, 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 TPS54328DDA part is unused and in its original packaging.
Return procedure for TPS54328DDA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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