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Texas Instruments TPS54228DR
- Part No.:
- TPS54228DR
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS54228DR.pdf
- Description:
- IC REG BUCK ADJ 2A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
TPS54228 from Texas Instruments is a 2-A synchronous step-down DC/DC converter with integrated high-side (155 mΩ) and low-side (108 mΩ) N-channel MOSFETs, operating from 4.5 V to 18 V input and delivering adjustable output voltage from 0.76 V to 7 V using D-CAP2™ adaptive on-time control. It features 700-kHz switching frequency, Eco-Mode™ for light-load efficiency (<10 µA shutdown current), and supports ceramic output capacitors in digital TV, Blu-ray player, and STB power supplies.
For engineers reviewing the TPS54228 datasheet, TPS54228 pinout, TPS54228 application, or TPS54228 equivalent, key selection considerations include its D-CAP2™ transient response capability, prebiased soft-start functionality, cycle-by-cycle overcurrent protection, thermal shutdown at 165°C, and compatibility with low-ESR ceramic or polymer output capacitors in compact 8-pin SOIC/HSOP or 10-pin VSON packages.
Technical Context
The TPS54228 implements adaptive on-time D-CAP2™ control-combining constant on-time operation with internal ripple injection-to achieve fast load-transient response without external compensation. Its one-shot timer sets on-time inversely proportional to VIN and proportional to VOUT, enabling pseudo-fixed 700-kHz operation across input and output voltage ranges.
It transitions seamlessly between PWM mode (continuous conduction) and Auto-Skip Eco-Mode™ (discontinuous conduction) based on load current, maintaining high efficiency down to microamp-level loads. Protection includes cycle-by-cycle valley-current limiting via SW–GND sensing, non-latching UVLO triggered by VREG5 voltage, 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-input industrial and consumer DC bus rails including 5 V, 12 V, and 15 V systems. |
| Output Current | 2 A continuous - sufficient for core logic rails in digital video and networking equipment. |
| Switching Frequency | 700 kHz - enables compact magnetics and EMI filtering while balancing efficiency and thermal performance. |
| FET RDS(on) | 155 mΩ (high-side), 108 mΩ (low-side) - optimized for lower duty-cycle applications (e.g., 1.05 V @ 12 VIN) to minimize conduction loss. |
| Feedback Reference | 0.765 V ±1.5% - precise bandgap reference enabling accurate output regulation with standard resistor dividers. |
| Shutdown Current | <10 µA - ensures ultra-low system standby power in always-on consumer electronics. |
| Soft-Start Control | Adjustable via external capacitor - prevents inrush current and enables controlled ramp-up even with prebiased outputs. |
Pinout & Package
TPS54228 is available in three package variants: 8-pin HSOP (DDA), 8-pin SOIC (D), and 10-pin VSON (DRC). All variants share identical functional pin mapping except for dual GND and SW pins in VSON. Thermal pad must be soldered to PCB ground for thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | Enable input | Active-high logic control; internal 220–880 kΩ pull-down enables default disable; threshold at 0.6 V / 1.6 V. |
| VFB | Feedback input | Monitors output via resistor divider; 0.765 V reference enables precise regulation; ±0.1 µA input bias minimizes divider error. |
| VREG5 | Internal LDO output | 5.5-V regulated supply for gate drivers; requires 1-µF ceramic bypass to GND; inactive when EN = low. |
| SS | Soft-start control | Capacitor-based timing node; 2 µA charge current enables programmable startup ramp; supports prebiased start-up. |
| GND | Power ground | Common return for switching path (PGND) and signal references (SGND); single-point grounding critical for stability. |
| SW | Switch node | Connection point between internal high- and low-side FETs; drives external inductor; requires low-inductance layout. |
| VBST | Bootstrap supply | Charges high-side gate driver; requires 0.1-µF ceramic capacitor to SW; internally diode-fed from VREG5. |
| VIN | Main input supply | Accepts 4.5–18 V; requires local 10-µF ceramic + optional 0.1-µF HF decoupling; feeds both power stage and VREG5 LDO. |
Key Features
| Feature | Design Value |
|---|---|
| D-CAP2™ control architecture | Eliminates need for external compensation components while supporting ceramic and polymer output capacitors with near-zero ESR. |
| Eco-Mode™ auto-skip operation | Reduces switching losses at light loads by entering discontinuous conduction mode, sustaining >85% efficiency at 10 mA output. |
| Prebiased soft-start circuitry | Prevents reverse current flow during startup into precharged outputs by gradually enabling low-side FET conduction. |
| Cycle-by-cycle overcurrent protection | Monitors low-side FET voltage during conduction to detect overcurrent; non-latching with dual-threshold recovery for robust fault handling. |
| Integrated 5.5-V VREG5 LDO | Supplies gate drive circuitry independently of input rail; eliminates need for external bias supply in most designs. |
Applications
| Digital TV Power Supply | High Definition Blu-ray Disc™ Player |
|---|---|
Use Scenario: Powers SoC core voltage (1.05 V/2 A) and memory interface rails in flat-panel TV mainboards. IC Role / Device Role / Timing Role: Primary buck regulator delivering tightly regulated low-voltage rail with fast transient response to handle video processing bursts. Use Value: D-CAP2™ control maintains <20 mVpp output ripple under 1-A step load, eliminating need for large bulk capacitance. | Use Scenario: Supplies HDMI controller and video decoder ICs requiring stable 1.2 V/1.5 A rails in Blu-ray disc players. IC Role / Device Role / Timing Role: Synchronous step-down converter managing dynamic load changes during disc read/write and video decode operations. Use Value: Eco-Mode™ reduces no-load power to <10 µA, meeting Energy Star standby requirements for consumer AV devices. |
| Networking Home Terminal | Digital Set Top Box (STB) |
Use Scenario: Generates 3.3 V/2 A for Ethernet PHY and packet processor in residential gateways and VoIP adapters. IC Role / Device Role / Timing Role: High-efficiency DC/DC converter supporting burst-mode traffic with minimal thermal rise in enclosed plastic enclosures. Use Value: 700-kHz switching enables use of 2.2-µH shielded inductors and 22–68 µF X5R ceramics, reducing board area by 35% vs. 300-kHz alternatives. | Use Scenario: Delivers 1.8 V/2 A to QAM demodulator and MPEG decoder in cable/satellite STBs operating 24/7. IC Role / Device Role / Timing Role: Main system power regulator handling rapid load transients during channel change and DVR buffering. Use Value: Prebiased soft-start prevents output collapse when powering up alongside already-charged downstream rails, ensuring reliable boot sequence. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54227PWR | Same D-CAP2™ control, 2-A rating, but fixed 5.5-V VREG5 and no VBST pin; uses external bootstrap diode. | Lacks integrated high-side gate drive; requires external diode/capacitor network; less suitable for space-constrained layouts. | Select when cost sensitivity outweighs layout simplicity and thermal performance is secondary. |
| MP2307DN-LF-Z | Fixed-frequency 340-kHz PWM control, 2-A rating, 4.5–23-V input, but no Eco-Mode™ or prebiased soft-start. | Higher light-load quiescent current (~250 µA); requires external compensation; limited transient response vs. D-CAP2™. | Choose for legacy designs where fixed-frequency EMI profile is preferred and light-load efficiency is not critical. |
Compared with TPS54227PWR and MP2307DN-LF-Z, the TPS54228 provides superior transient response via D-CAP2™, lower shutdown current, and integrated bootstrap drive-making it optimal for next-generation consumer electronics demanding compact size, high efficiency, and robust startup behavior.
Availability
TPS54228 is available at Aetrix Electronics and suitable for digital TV power supplies, Blu-ray player subsystems, and networking home terminals requiring stable component supply with full production traceability and long-term lifecycle support.
Supply support for TPS54228 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, designing and manufacturing analog and embedded processing chips for industrial, automotive, and consumer markets.
The TPS54228 belongs to TI's D-CAP2™ synchronous buck converter product line, engineered specifically for high-efficiency, low-component-count power conversion in space- and thermally constrained consumer electronics.
FAQ
What is the recommended input capacitor configuration for TPS54228?
A minimum 10-µF ceramic capacitor is required directly at the VIN pin for high-frequency decoupling, supplemented by a bulk capacitor if input source impedance is high. TI also recommends an optional 0.1-µF ceramic capacitor from VIN to GND for additional high-frequency noise suppression. The TPS54228 datasheet specifies that all input capacitors must have voltage ratings exceeding the maximum input voltage (18 V), and low-ESR types are strongly preferred to minimize input ripple and thermal stress on the device.
Does TPS54228 support prebiased output startup?
Yes, the TPS54228 includes proprietary prebiased soft-start circuitry. When the output is already charged before enable, the controller avoids sinking current by initiating low-side FET gate pulses with narrow on-time and incrementally increasing conduction until reaching normal duty-cycle operation. This prevents output voltage collapse and ensures smooth regulation ramp-up. This feature is confirmed in Section 7.3.4 of the TPS54228 datasheet and applies identically across all package variants (DDA, D, DRC).
What is the thermal shutdown threshold and hysteresis for TPS54228?
The TPS54228 triggers thermal shutdown at a junction temperature of 165°C, with a hysteresis of 35°C-meaning the device resumes normal operation only after junction temperature falls below 130°C. This non-latching protection is implemented via on-die thermal sensing and is independent of ambient conditions. The thermal metrics table (Section 6.4) lists RθJA values of 45.3°C/W (DDA), 114.4°C/W (D), and 43.9°C/W (DRC), confirming the VSON package offers the best thermal performance for high-power-density designs.
Can TPS54228 operate with ceramic output capacitors only?
Yes, the TPS54228 is explicitly designed to work with ultra-low-ESR ceramic capacitors-no electrolytic or tantalum bulk capacitance is required. Its D-CAP2™ control architecture incorporates internal ripple injection to stabilize regulation without relying on ESR-induced output ripple. The datasheet recommends 22 µF to 68 µF X5R/X7R ceramics (e.g., two parallel 22-µF units), and confirms stable operation with typical ESR as low as 2 mΩ per capacitor. This enables smaller, more reliable, and longer-life power stages.
What are the key differences between TPS54228 and TPS54227?
The TPS54228 integrates a bootstrap capacitor connection via the VBST pin and uses an internal diode from VREG5 to VBST, whereas the TPS54227 requires an external bootstrap diode and lacks the VBST pin. Additionally, the TPS54228 supports adjustable soft-start and prebiased startup, while the TPS54227 has fixed soft-start timing and no prebias handling. Both share D-CAP2™ control and 2-A rating, but the TPS54228 offers higher integration and enhanced system-level robustness for modern consumer applications.
TPS54228DR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- D-CAP2™, Eco-Mode™
- Package/Case:
- 8-SOIC (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:
- 2A
- Frequency - Switching:
- 700kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
TPS54228DR FAQ
1.How can I place an order for TPS54228DR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54228DR 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 TPS54228DR reliable?
The price and inventory of TPS54228DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54228DR is usually 5 days.
3.What payment methods are accepted for TPS54228DR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54228DR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54228DR?
TPS54228DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54228DR 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 TPS54228DR?
For technical support, including TPS54228DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54228DR requirements.
6.How does Aetrix verify that TPS54228DR is sourced from the original manufacturer or authorized distributors?
All TPS54228DR 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 TPS54228DR meets industry standards.
7.What is the process for return or replacement of TPS54228DR?
All TPS54228DR units undergo pre-shipment inspection (PSI). If there is an issue with TPS54228DR, 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 TPS54228DR part is unused and in its original packaging.
Return procedure for TPS54228DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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