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Texas Instruments TPS56428DDA
- Part No.:
- TPS56428DDA
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS56428DDA.pdf
- Description:
- IC REG BUCK ADJ 4A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:1,431
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Product details
Overview
TPS56428DDA from Texas Instruments is a 4-A synchronous step-down DC/DC converter in an 8-pin HSOP package, featuring D-CAP2™ adaptive on-time control, 4.5–18 V input range, 0.6–7.0 V programmable output, and integrated 68 mΩ/37 mΩ MOSFETs. It delivers high efficiency across load ranges in digital TV power rails and networking terminal supplies.
For engineers reviewing the TPS56428DDA datasheet, TPS56428DDA pinout, TPS56428DDA application, or TPS56428DDA equivalent, key selection criteria include light-load Eco-mode efficiency, ceramic-capacitor compatibility, fixed 650 kHz pseudo-constant switching frequency, pre-bias soft-start capability, and thermal shutdown at 165°C.
Technical Context
The TPS56428DDA implements D-CAP2™ control with adaptive on-time modulation-on-time inversely proportional to VIN and proportional to VOUT-to maintain ~650 kHz pseudo-fixed frequency without external compensation. Its internal ramp eliminates need for ESR-induced ripple, enabling stable operation with ultra-low-ESR ceramic capacitors.
It integrates dual N-channel MOSFETs (68 mΩ high-side, 37 mΩ low-side), supports seamless transition between PWM and Advanced Eco-mode™, and features cycle-by-cycle overcurrent protection with valley-current sensing on the low-side FET. Power-good (PG) asserts after 1.7× soft-start time when VFB reaches ±10% of target.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 18 V - supports wide industrial and consumer input buses including 5 V, 12 V, and 15 V rails. |
| Output Current | 4 A continuous - sufficient for powering SoCs, FPGAs, and DDR memory subsystems in STB and network controllers. |
| Switching Frequency | ~650 kHz - enables compact magnetics and predictable EMI filtering while balancing efficiency and size. |
| FET RDS(on) | 68 mΩ (HS) / 37 mΩ (LS) - reduces conduction loss and improves full-load efficiency up to 95% at 1.8 V/3 A. |
| Soft-Start Time | 1.0 ms (fixed) - ensures controlled voltage ramp-up and prevents inrush current during power-on sequencing. |
| Reference Accuracy | ±1% initial - guarantees tight output regulation across temperature and line/load variations for precision analog supplies. |
| Shutdown Current | <10 µA - enables ultra-low standby power in always-on consumer electronics like digital TVs and set-top boxes. |
Pinout & Package
TPS56428DDA uses an 8-pin HSOP (DDA) package with exposed thermal pad (4.89 mm × 3.9 mm), rated for –40°C to 85°C ambient operation. Thermal pad must be soldered to GND for optimal junction-to-board thermal resistance (27.8°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN | Enable input | Active-high logic control; internal 180–700 kΩ pull-down allows direct MCU GPIO drive without external resistor. |
| 2 VFB | Feedback input | Monitors output via resistor divider; ±0.15 µA input bias enables high-value dividers for low quiescent current. |
| 3 VREG5 | 5.5 V LDO output | Supplies gate drive and internal circuitry; requires 0.47 µF ceramic cap to GND; disabled when EN = low. |
| 4 PG | Open-drain power-good | Asserts high after 1.7× soft-start when VFB is within ±10%; sinks up to 4 mA for system sequencing. |
| 5 GND | Power ground | Main return path for SW, VIN, and VREG5; must connect to thermal pad and minimize trace inductance. |
| 6 SW | Switch node | Connects high-side and low-side FETs; requires low-inductance layout and 0.1 µF bootstrap cap to VBST. |
| 7 VBST | Bootstrap supply | Charged via internal diode from VREG5; 0.1 µF ceramic cap to SW enables high-side gate drive above VIN. |
| 8 VIN | Main input supply | Accepts 4.5–18 V; requires local 10 µF+ ceramic decoupling; shares thermal pad connection with GND. |
Key Features
| Feature | Design Value |
|---|---|
| D-CAP2™ adaptive on-time control | Eliminates external compensation components and enables stable regulation with zero-ESR ceramic capacitors. |
| Advanced Eco-mode™ | Maintains >85% efficiency at 10 mA load (Vo=1.8 V), outperforming traditional skip-mode converters at light loads. |
| Pre-bias soft-start | Prevents reverse current flow into pre-charged outputs by gradually enabling low-side FET conduction. |
| Integrated power-good (PG) | Provides system-level sequencing signal with ±10% accuracy and 1.7× tSS delay-no external monitoring needed. |
| Cycle-by-cycle overcurrent protection | Detects low-side FET voltage during conduction; triggers hiccup mode after 7 consecutive overcurrent cycles. |
Applications
| Application 1 | Application 2 |
|---|---|
Use Scenario: Power supply for HDMI interface and video processing ASIC in digital TV main board. IC Role / Device Role / Timing Role: Primary 1.2 V/3 A buck regulator delivering clean, low-noise core voltage to video decoder SoC. Use Value: D-CAP2™ fast transient response suppresses voltage droop during burst pixel data transfers; Eco-mode extends standby battery life in smart TV remote-wake functions. |
Use Scenario: Point-of-load regulator for Ethernet PHY and switch controller in home gateway unit. IC Role / Device Role / Timing Role: Secondary 3.3 V/2.5 A converter stepping down 5 V bus to power communication interfaces and management MCU. Use Value: Integrated 68 mΩ/37 mΩ FETs reduce BOM count and thermal footprint; PG output synchronizes firmware boot sequence with PHY initialization. |
| Application 3 | Application 4 |
Use Scenario: Core voltage rail for MPEG-4 decoder and audio DSP in digital set-top box. IC Role / Device Role / Timing Role: High-efficiency 1.05 V/4 A regulator supporting dynamic voltage scaling during video decode workloads. Use Value: 1% reference accuracy ensures consistent timing margins across process/voltage/temperature; 1-ms soft-start prevents brownout during cold boot. |
Use Scenario: I/O supply for FPGA configuration and peripheral interface in network controller card. IC Role / Device Role / Timing Role: Adjustable 1.8 V/3.5 A output powering transceivers and PCIe SerDes buffers. Use Value: Ceramic capacitor support simplifies layout in space-constrained mezzanine cards; thermal shutdown (165°C) protects against airflow blockage in dense chassis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS564208DDA | Same 8-pin HSOP package, but rated for 2.5 A max output and lower RDS(on) (72 mΩ/42 mΩ); no VREG5 output. | Limited to lower-power SoCs and microcontrollers; lacks integrated 5.5 V LDO for external gate drive or biasing. | Select when output current ≤2.5 A and external LDO is available; not suitable for designs requiring VREG5-sourced bootstrap or auxiliary bias. |
| MP2315DJ-LF-Z | Monolithic 4 A buck in 8-pin SOIC; 4.5–28 V input; fixed 650 kHz; no Eco-mode or pre-bias start; higher shutdown current (25 µA). | Higher input voltage tolerance suits 24 V industrial systems; lacks advanced light-load optimization for consumer standby modes. | Choose for cost-sensitive industrial applications where 24 V input or simplified feature set outweighs Eco-mode efficiency and sequencing flexibility. |
Compared with TPS56428DDA, TPS564208DDA offers reduced current capability and no VREG5, limiting its use in self-contained designs, while MP2315DJ-LF-Z trades Eco-mode and pre-bias support for wider VIN range-making TPS56428DDA optimal for consumer electronics demanding high light-load efficiency and robust startup behavior.
Availability
TPS56428DDA is available at Aetrix Electronics and suitable for digital TV power rails, networking terminal supplies, digital set-top box core voltage generation, and network controller I/O regulation requiring stable component supply and long-term production continuity.
Supply support for TPS56428DDA 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 TPS56428DDA belongs to TI's D-CAP2™ synchronous buck converter product line, designed specifically for cost-sensitive, high-density consumer and networking applications requiring minimal external components, ceramic-capacitor compatibility, and seamless light-to-heavy load transitions.
FAQ
What is the maximum output current supported by the TPS56428DDA?
The TPS56428DDA is rated for 4 A continuous output current under recommended operating conditions (TA ≤ 85°C, proper PCB thermal design). Its integrated 68 mΩ high-side and 37 mΩ low-side MOSFETs enable this rating with typical efficiency >92% at 12 VIN/1.8 VOUT/3 A. Derating applies above 85°C ambient or with inadequate copper area on the thermal pad.
Does the TPS56428DDA require external compensation components?
No, the TPS56428DDA uses D-CAP2™ adaptive on-time control, which eliminates the need for external compensation networks. Its internal circuitry provides inherent stability with ceramic output capacitors-including zero-ESR types-without loop compensation resistors or capacitors, reducing BOM count and layout complexity.
Can the TPS56428DDA safely start up into a pre-biased output?
Yes, the TPS56428DDA includes dedicated pre-bias soft-start circuitry. When enabled, it gradually ramps low-side FET conduction to prevent reverse current flow into a pre-charged output, ensuring smooth voltage ramp-up without sinking charge. This is confirmed in Section 8.3.4 of the SLVSBV4B datasheet.
What is the function of the VREG5 pin on the TPS56428DDA?
The VREG5 pin on the TPS56428DDA is a 5.5 V internal LDO output used to power the high-side gate driver and internal logic. It sources up to 5 mA and requires a 0.47 µF ceramic capacitor to GND. VREG5 is disabled when EN is low, and it powers the VBST bootstrap circuit through an internal diode-enabling reliable high-side FET operation.
How does the Advanced Eco-mode™ in the TPS56428DDA improve light-load efficiency?
Advanced Eco-mode™ in the TPS56428DDA dynamically transitions from PWM to discontinuous conduction mode (DCM) as load decreases, extending off-time while maintaining fixed on-time. This avoids inefficient pulse-skipping and sustains >85% efficiency at 10 mA (Vo = 1.8 V), significantly outperforming conventional skip-mode converters in standby and idle states common in digital TV and STB applications.
TPS56428DDA 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):
- 0.6V
- 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
TPS56428DDA FAQ
1.How can I place an order for TPS56428DDA through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS56428DDA 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 TPS56428DDA reliable?
The price and inventory of TPS56428DDA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS56428DDA is usually 5 days.
3.What payment methods are accepted for TPS56428DDA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS56428DDA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS56428DDA?
TPS56428DDA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS56428DDA 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 TPS56428DDA?
For technical support, including TPS56428DDA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS56428DDA requirements.
6.How does Aetrix verify that TPS56428DDA is sourced from the original manufacturer or authorized distributors?
All TPS56428DDA 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 TPS56428DDA meets industry standards.
7.What is the process for return or replacement of TPS56428DDA?
All TPS56428DDA units undergo pre-shipment inspection (PSI). If there is an issue with TPS56428DDA, 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 TPS56428DDA part is unused and in its original packaging.
Return procedure for TPS56428DDA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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