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Texas Instruments TPS54428DDA
- Part No.:
- TPS54428DDA
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS54428DDA.pdf
- Description:
- IC REG BUCK ADJ 4A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:123
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Product details
Overview
TPS54428DDA from Texas Instruments is a 4.5-V to 18-V input, 4-A synchronous step-down DC/DC converter in an 8-pin SO PowerPAD™ package. It uses D-CAP2™ adaptive on-time control for fast transient response, delivers 0.76 V to 7.0 V adjustable output, features 70 mΩ high-side and 53 mΩ low-side integrated MOSFETs, and operates at 650 kHz switching frequency-designed for digital TV power supplies and STB applications.
For engineers reviewing the TPS54428DDA datasheet, TPS54428DDA pinout, TPS54428DDA application, or TPS54428DDA equivalent, key selection considerations include Eco-mode™ light-load efficiency, pre-biased soft-start capability, cycle-by-cycle overcurrent protection, thermal shutdown at 170°C, and compatibility with ceramic output capacitors without external compensation.
Technical Context
The TPS54428DDA implements D-CAP2™ mode control using adaptive on-time PWM, eliminating need for external compensation while enabling stable operation with ultra-low-ESR ceramic capacitors. Its internal one-shot timer sets on-time inversely proportional to VIN and proportional to VOUT, maintaining pseudo-constant 650-kHz frequency across input and load variations.
Eco-mode™ enables seamless transition from continuous conduction mode (CCM) to discontinuous conduction mode (DCM) at light loads, reducing switching losses. Current limiting uses valley-detect on low-side FET voltage during its on-time, with temperature-compensated sensing and non-latching 7-cycle fault detection before OCL threshold reduction.
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 | 4 A continuous - sufficient for powering SoCs, FPGAs, and memory subsystems in digital video equipment. |
| Switching Frequency | 650 kHz - enables compact magnetics and EMI filtering while balancing efficiency and thermal performance. |
| Feedback Reference | 0.765 V ±1.5 mV - high-accuracy bandgap reference enabling precise output regulation down to 0.76 V. |
| High-Side RDS(on) | 70 mΩ - reduces conduction loss at high duty cycles, improving efficiency in low-VOUT applications. |
| Low-Side RDS(on) | 53 mΩ - minimizes synchronous rectification loss, critical for mid-to-high load efficiency. |
| Shutdown Current | <10 μA - enables ultra-low quiescent power in standby or battery-backed systems. |
| Thermal Shutdown | 170°C with 35°C hysteresis - protects against sustained overload or poor PCB thermal design without latch-up. |
Pinout & Package
TPS54428DDA is housed in an 8-pin SO PowerPAD™ package (4.90 mm × 3.90 mm) with exposed thermal pad soldered to GND for enhanced thermal dissipation. The package supports up to 42.1°C/W junction-to-ambient thermal resistance under standard JEDEC conditions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | Enable input | Active-high logic control; 1.6 V threshold ensures robust noise immunity in noisy environments. |
| VFB | Feedback input | Monitors output via resistor divider; 0.765 V reference enables accurate programmable VOUT from 0.76 V to 7.0 V. |
| VREG5 | 5.5 V LDO output | Supplies gate drive and internal circuitry; requires 1 µF ceramic capacitor to GND for stability. |
| SS | Soft-start control | External capacitor sets ramp time; supports pre-biased startup by delaying synchronous rectifier activation. |
| GND | Power ground | Common return for switching path and sensitive analog nodes; must be star-connected with SS/VFB returns. |
| SW | Switch node | Connection between high- and low-side FETs; requires tight layout to minimize ringing and EMI. |
| VBST | Bootstrap supply | Charged via internal diode from VREG5; 0.1 µF ceramic capacitor to SW enables high-side gate drive. |
| VIN | Main input supply | Accepts 4.5–18 V; requires local 10 µF ceramic + bulk capacitance for ripple suppression. |
Key Features
| Feature | Design Value |
|---|---|
| D-CAP2™ adaptive on-time control | Enables <10 µs transient response without external compensation components or type-II/III networks. |
| Eco-mode™ auto-skip operation | Maintains >85% efficiency at 10 mA load by entering DCM and reducing switching frequency dynamically. |
| Pre-biased soft-start | Prevents reverse current flow during startup when output is already biased, avoiding system-level brownouts. |
| Cycle-by-cycle overcurrent protection | Detects low-side FET voltage during conduction; triggers non-latching shutdown after 7 consecutive faults. |
| Integrated 5.5 V LDO (VREG5) | Provides regulated bias for internal logic and gate drivers; delivers up to 10 mA with ±25 mV line/load regulation. |
| Thermal shutdown with hysteresis | Shuts down at 170°C junction temperature and resumes operation only after cooling to 135°C, preventing thermal cycling. |
Applications
| Digital TV Power Supply | High Definition Blu-ray Disc™ Player |
|---|---|
Use Scenario: Powers main SoC, DDR memory, and video processing ICs from 12 V input rail in flat-panel TV designs. IC Role / Device Role / Timing Role: Primary buck regulator delivering 1.05 V @ 4 A to processor core with fast load-step response to video frame bursts. Use Value: D-CAP2™ control meets <50 mV output deviation during 2-A load transients, eliminating need for large bulk capacitance. | Use Scenario: Supplies 1.2 V and 1.8 V rails to BD-ROM controller, HDMI transmitter, and audio DAC in consumer disc players. IC Role / Device Role / Timing Role: Dual-output implementation (using two TPS54428DDA units) provides independent, tightly regulated low-noise supplies. Use Value: 650-kHz fixed-frequency operation simplifies EMI filter design while Eco-mode™ extends standby battery life. |
| Networking Home Terminal | Digital Set Top Box (STB) |
Use Scenario: Generates 3.3 V and 5 V auxiliary rails for Ethernet PHY, Wi-Fi module, and USB peripherals in residential gateways. IC Role / Device Role / Timing Role: Secondary buck converter supporting hot-plug detection and dynamic power management of peripheral interfaces. Use Value: Adjustable soft-start prevents inrush current tripping upstream fuses during firmware-initiated reboots. | Use Scenario: Delivers 1.05 V core voltage to MPEG decoder SoC and 1.8 V I/O voltage to tuner and demodulator in cable/satellite receivers. IC Role / Device Role / Timing Role: Main system regulator operating across –40°C to 85°C ambient with guaranteed 4-A output capability. Use Value: SO PowerPAD™ package achieves 31.8°C/W junction-to-board thermal resistance, enabling convection-only cooling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54427DDA | Same D-CAP2™ architecture but rated for 3-A output; lower RDS(on) (60 mΩ HS / 42 mΩ LS); identical pinout and package. | Lower max current limits suitability for SoC cores requiring >3.5 A peak; better efficiency below 2 A due to lower conduction loss. | Select when full 4-A capability is unnecessary and higher light-load efficiency is prioritized over peak current headroom. |
| MP2315DJ-LF-Z | Monolithic 4-A buck with 3.3–18 V input; fixed 650 kHz frequency; no Eco-mode™; requires external compensation; 8-pin SOIC without thermal pad. | Lacks pre-biased soft-start and D-CAP2™ transient performance; less suitable for systems with strict output voltage monotonicity requirements. | Choose for cost-sensitive designs where simplified BOM (no VBST cap) and absence of thermal pad simplify assembly outweigh dynamic performance needs. |
Compared with TPS54428DDA, TPS54427DDA offers tighter thermal performance and lower conduction loss at partial load but sacrifices 1-A peak capacity, while MP2315DJ-LF-Z trades advanced control features and thermal robustness for lower component count and cost in static-load applications.
Availability
TPS54428DDA is available at Aetrix Electronics and suitable for digital TV power supplies, HD Blu-ray player subsystems, and digital set-top box designs requiring stable component supply, long-term lifecycle support, and production-grade thermal reliability.
Supply support for TPS54428DDA 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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management technologies since 1930.
The TPS54428DDA belongs to TI's D-CAP2™ synchronous buck converter product line, engineered for high-efficiency, low-component-count DC/DC conversion in space-constrained consumer and industrial electronics with demanding transient response requirements.
FAQ
What is the recommended input capacitor configuration for TPS54428DDA?
TI recommends a minimum 10-µF ceramic capacitor placed close to the VIN and GND pins of the TPS54428DDA, plus an optional 0.1-µF ceramic capacitor directly from VIN to GND for high-frequency noise filtering. Bulk capacitance should be added based on system-level ripple requirements and source impedance. The TPS54428DDA datasheet specifies these values to ensure stable operation and minimize input voltage droop during high di/dt switching events.
Does TPS54428DDA support pre-biased output startup?
Yes, the TPS54428DDA includes proprietary pre-biased soft-start circuitry that prevents reverse current flow when the output is already biased at startup. It does this by initially applying narrow low-side gate pulses and incrementally increasing on-time until reaching normal CCM operation. This feature is confirmed in Section 7.4.1 of the TPS54428DDA datasheet and is essential for systems with powered-backup rails or cascaded power domains.
What is the maximum achievable output voltage accuracy for TPS54428DDA?
The TPS54428DDA has a typical feedback reference voltage of 0.765 V with ±1.5 mV initial accuracy at 25°C and ±6 mV over –40°C to 85°C. When combined with 1% tolerance resistors in the feedback divider, total output voltage error remains within ±1.5% across temperature and line/load conditions. This accuracy is specified in Section 6.5 of the TPS54428DDA electrical characteristics table.
Can TPS54428DDA operate with ceramic output capacitors only?
Yes, the TPS54428DDA is specifically designed to work with ultra-low-ESR ceramic output capacitors without external compensation. Its D-CAP2™ control architecture includes internal ripple injection to maintain loop stability even with near-zero output ripple. TI validates this behavior using 22 µF to 68 µF X5R/X7R ceramics in the TPS54428DDA typical application circuit (Figure 11).
What thermal derating guidance applies to TPS54428DDA in SO PowerPAD™ package?
For the TPS54428DDA in 8-pin SO PowerPAD™ package, TI specifies 31.8°C/W junction-to-board thermal resistance (RθJB). Derating begins above 85°C ambient; full 4-A output is guaranteed only up to 85°C case temperature. Above that, output current must be reduced per the thermal curves in Figure 16 of the TPS54428DDA datasheet, with thermal shutdown activating at 170°C junction temperature.
TPS54428DDA 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:
- 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
TPS54428DDA FAQ
1.How can I place an order for TPS54428DDA through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54428DDA 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 TPS54428DDA reliable?
The price and inventory of TPS54428DDA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54428DDA is usually 5 days.
3.What payment methods are accepted for TPS54428DDA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54428DDA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54428DDA?
TPS54428DDA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54428DDA 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 TPS54428DDA?
For technical support, including TPS54428DDA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54428DDA requirements.
6.How does Aetrix verify that TPS54428DDA is sourced from the original manufacturer or authorized distributors?
All TPS54428DDA 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 TPS54428DDA meets industry standards.
7.What is the process for return or replacement of TPS54428DDA?
All TPS54428DDA units undergo pre-shipment inspection (PSI). If there is an issue with TPS54428DDA, 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 TPS54428DDA part is unused and in its original packaging.
Return procedure for TPS54428DDA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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