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Texas Instruments TPS54428DDAR
- Part No.:
- TPS54428DDAR
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS54428DDAR.pdf
- Description:
- IC REG BUCK ADJ 4A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:8,518
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Product details
Overview
TPS54428DDAR from Texas Instruments is a 4.5-V to 18-V input, 4-A synchronous step-down DC/DC converter with D-CAP2™ adaptive on-time control, 650-kHz switching frequency, and Eco-mode™ for light-load efficiency. It integrates 70-mΩ high-side and 53-mΩ low-side N-channel MOSFETs in an SO PowerPAD (8-pin) package, delivering regulated output voltages from 0.76 V to 7.0 V - used in digital TV power supplies and networking terminal systems.
For engineers reviewing the TPS54428DDAR datasheet, TPS54428DDAR pinout, TPS54428DDAR application, or TPS54428DDAR equivalent, key selection criteria include its D-CAP2™ transient response, adjustable soft-start, pre-biased startup capability, cycle-by-cycle overcurrent protection, and thermal shutdown at 170°C - all validated for industrial ambient operation from –40°C to 85°C.
Technical Context
The TPS54428DDAR implements adaptive on-time D-CAP2™ control without external compensation, enabling fast load transient response and stable operation with ceramic or low-ESR polymer output capacitors. Its internal one-shot timer sets on-time inversely proportional to VIN and proportional to VOUT, sustaining ~650 kHz pseudo-fixed frequency across input and load variations.
It supports seamless PWM-to-Eco-mode™ transition: above ~1 A, it operates in continuous conduction mode with fixed-frequency behavior; below that, it enters discontinuous conduction with valley-current detection and synchronous rectifier gating control to minimize light-load losses - achieving <10 µA shutdown current and >88% peak efficiency at 5 VIN/0.7 AOUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 18 V - supports wide-input industrial and consumer rails including 5 V, 12 V, and 15 V bus systems. |
| Output Current | 4 A continuous - sufficient for powering SoCs, FPGAs, and DDR memory subsystems requiring stable mid-power regulation. |
| Switching Frequency | 650 kHz - enables compact magnetics design while balancing EMI and efficiency trade-offs. |
| Integrated FETs | 70 mΩ high-side / 53 mΩ low-side - optimized for lower duty-cycle applications (e.g., 1.05 VOUT @ 12 VIN) with minimal conduction loss. |
| VFB Reference Accuracy | ±1.5% over temperature - ensures tight output voltage regulation (0.76 V to 7.0 V programmable via resistor divider). |
| Soft-Start Control | Adjustable via external capacitor on SS pin - prevents inrush current and enables controlled ramp-up even with pre-biased outputs. |
| Protection Features | Cycle-by-cycle overcurrent limit (4.6–6.8 A), UVLO (3.45–4.05 V on VREG5), thermal shutdown (170°C), non-latching - supports robust system-level fault handling. |
Pinout & Package
TPS54428DDAR uses the SO PowerPAD (8-pin) package with 4.90 mm × 3.90 mm body size and exposed thermal pad soldered to GND for enhanced thermal dissipation (RθJB = 31.8°C/W). The thermal pad is electrically connected to PGND and must be grounded for safe operation and reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | Enable input | Active-high logic control (1.6 V threshold); pulls up internally to VREG5 when unconnected - enables sequencing and standby control. |
| VFB | Feedback input | Monitors output voltage via resistor divider; 0.765 V reference sets regulation point - accuracy directly determines output tolerance. |
| VREG5 | 5.5 V LDO output | Supplies gate drive and internal circuitry; delivers up to 10 mA; disabled when EN = low - eliminates need for external bias rail. |
| SS | Soft-start capacitor node | Charged by 6 µA internal current source; controls output ramp rate and prevents overshoot during startup. |
| GND | Power ground return | Common return for switching path and sensitive analog circuits - requires single-point grounding with VFB/SS traces to minimize noise coupling. |
| SW | Switch node | Connection between integrated high- and low-side FETs - carries high di/dt switching waveform; critical for layout and EMI control. |
| VBST | Bootstrap supply | Charged via internal diode from VREG5; requires 0.1 µF ceramic cap to SW - enables high-side FET gate drive above VIN. |
| VIN | Main input supply | Accepts 4.5–18 V; feeds both power stage and internal regulators - requires local 10 µF+ ceramic decoupling. |
Key Features
| Feature | Design Value |
|---|---|
| D-CAP2™ control mode | Enables zero-external-compensation design with fast transient response (<10 µs recovery for 1-A load step) and compatibility with ceramic output capacitors. |
| Eco-mode™ operation | Reduces light-load quiescent current to <10 µA and maintains >80% efficiency down to 10 mA output - ideal for always-on system rails. |
| Pre-biased soft start | Prevents reverse current flow during startup into pre-charged outputs by gradually enabling low-side FET gating - avoids output voltage collapse. |
| Integrated VREG5 LDO | Provides self-contained 5.5 V bias for gate drivers and internal logic - eliminates external 5-V supply and simplifies BOM. |
| Thermal and fault protection | Includes non-latching thermal shutdown (170°C), UVLO, and cycle-by-cycle overcurrent limiting - ensures safe operation under overload or misconfiguration. |
Applications
| Digital TV Power Supply | High Definition Blu-ray Disc™ Player |
|---|---|
Use Scenario: Powers main SoC core voltage (1.05 V/4 A) and memory interface rails in flat-panel TV platforms with variable input from AC/DC adapter. IC Role / Device Role / Timing Role: Primary buck regulator delivering tightly regulated, low-noise DC supply with fast transient response to handle video processing bursts. Use Value: D-CAP2™ control eliminates external compensation components and reduces output capacitance requirements by 30% versus traditional voltage-mode controllers. | Use Scenario: Supplies 1.2 V/3 A processor core and 1.8 V/2 A video decoder in portable HD disc players with battery + adapter input flexibility. IC Role / Device Role / Timing Role: High-efficiency synchronous buck converter operating across 5–15 V input range with Eco-mode™ extending battery runtime. Use Value: Achieves >85% efficiency at 100 mA load and maintains regulation stability with ceramic capacitors - reducing board area and cost. |
| Networking Home Terminal | Digital Set Top Box (STB) |
Use Scenario: Generates 3.3 V/2 A and 1.8 V/1.5 A rails for Ethernet PHY, Wi-Fi module, and baseband processor in residential gateway devices. IC Role / Device Role / Timing Role: Dual-rail capable buck converter supporting multiple independent outputs via cascaded or parallel configurations. Use Value: Adjustable soft-start and pre-biased startup prevent brownout during hot-plug events and ensure clean power sequencing across mixed-signal subsystems. | Use Scenario: Delivers 1.05 V/4 A core voltage and 1.2 V/2 A I/O rail for MPEG decoding SoC in cable/satellite STBs with 12 V wall adapter input. IC Role / Device Role / Timing Role: Main system power IC providing high-current, low-ripple regulation with integrated protection for field-deployed equipment. Use Value: Cycle-by-cycle overcurrent limit and thermal shutdown enable reliable operation under sustained overload - meeting CE/UL safety compliance requirements. |
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 | 3-A rated (vs 4-A), identical D-CAP2™ control, same SO PowerPAD package and pinout - shares 95% schematic compatibility. | Lower output current headroom; suitable for sub-3-A loads where thermal margin is less constrained. | Select when full 4-A capability is unnecessary - reduces cost and simplifies thermal design without changing layout. |
| MP2342DJ-LF-Z | 4-A rating, 500-kHz fixed frequency, current-mode control, different pinout (8-pin MSOP), no integrated VREG5 - requires external bias supply. | Lacks pre-biased soft start and Eco-mode™; higher light-load quiescent current (~50 µA vs <10 µA). | Choose for designs prioritizing fixed-frequency EMI predictability over ultra-low standby power or simplified bias architecture. |
Compared with TPS54428DDAR, TPS54328DDAR offers identical feature set at reduced current rating and cost, while MP2342DJ-LF-Z trades D-CAP2™ simplicity and Eco-mode™ efficiency for fixed-frequency control and external bias dependency - making TPS54428DDAR optimal for high-transient, low-quiescent, and space-constrained applications.
Availability
TPS54428DDAR is available at Aetrix Electronics and suitable for digital TV power supplies, HD Blu-ray player systems, and networking home terminals requiring stable component supply, long-term production continuity, and TI-qualified automotive-grade reliability.
Supply support for TPS54428DDAR 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 - serving industrial, automotive, and consumer markets with high-reliability silicon solutions.
The TPS54428DDAR belongs to TI's D-CAP2™ synchronous buck converter product line, designed specifically for high-efficiency, low-component-count DC/DC regulation in space- and thermally-constrained consumer electronics and network infrastructure.
FAQ
What is the maximum output current supported by the TPS54428DDAR?
The TPS54428DDAR supports up to 4 A of continuous output current under recommended operating conditions (TA = –40°C to 85°C, proper PCB thermal design). Its cycle-by-cycle overcurrent limit is specified from 4.6 A to 6.8 A depending on input voltage and inductor value - verified per TI SLVSB42D datasheet Section 6.5.
Does the TPS54428DDAR require external compensation components?
No, the TPS54428DDAR uses D-CAP2™ adaptive on-time control architecture and does not require external compensation components. Its internal control loop achieves stability with ceramic or low-ESR polymer output capacitors - confirmed in the Functional Block Diagram and Feature Description sections of the official datasheet.
Can the TPS54428DDAR start up into a pre-biased output?
Yes, the TPS54428DDAR includes proprietary pre-biased soft-start circuitry that prevents reverse current flow during startup. When the output is pre-charged, the device gradually enables low-side FET gating cycle-by-cycle - ensuring smooth voltage ramp-up without collapsing the existing rail, as detailed in Section 7.4.1 of the datasheet.
What is the purpose of the VREG5 pin on the TPS54428DDAR?
The VREG5 pin on the TPS54428DDAR provides a regulated 5.5 V output (4.0–5.7 V range) that powers internal gate drivers and logic circuits. It delivers up to 10 mA and is automatically disabled when EN = low - eliminating the need for an external bias supply and simplifying system power architecture.
What package type and thermal characteristics apply to the TPS54428DDAR?
The TPS54428DDAR uses the SO PowerPAD (8-pin) package with 4.90 mm × 3.90 mm body size and an exposed thermal pad connected to PGND. Its junction-to-board thermal resistance (RθJB) is 31.8°C/W - requiring the thermal pad to be soldered to a solid GND plane for optimal heat dissipation and reliability.
TPS54428DDAR 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:
- 4A
- 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
TPS54428DDAR FAQ
1.How can I place an order for TPS54428DDAR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54428DDAR 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 TPS54428DDAR reliable?
The price and inventory of TPS54428DDAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54428DDAR is usually 5 days.
3.What payment methods are accepted for TPS54428DDAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54428DDAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54428DDAR?
TPS54428DDAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54428DDAR 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 TPS54428DDAR?
For technical support, including TPS54428DDAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54428DDAR requirements.
6.How does Aetrix verify that TPS54428DDAR is sourced from the original manufacturer or authorized distributors?
All TPS54428DDAR 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 TPS54428DDAR meets industry standards.
7.What is the process for return or replacement of TPS54428DDAR?
All TPS54428DDAR units undergo pre-shipment inspection (PSI). If there is an issue with TPS54428DDAR, 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 TPS54428DDAR part is unused and in its original packaging.
Return procedure for TPS54428DDAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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