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Texas Instruments TPS54228DDAR
- Part No.:
- TPS54228DDAR
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS54228DDAR.pdf
- Description:
- IC REG BUCK ADJ 2A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:4,553
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Product details
Overview
TPS54228DDAR 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 at up to 2 A. It employs D-CAP2™ adaptive on-time control for fast transient response and supports Eco-Mode™ for high efficiency at light loads in digital TV, Blu-ray player, and STB power rails.
For engineers reviewing the TPS54228DDAR datasheet, TPS54228DDAR pinout, TPS54228DDAR application, or TPS54228DDAR equivalent, key selection considerations include its 700-kHz switching frequency, prebiased soft-start capability, cycle-by-cycle overcurrent protection, thermal shutdown at 165°C, and compatibility with ceramic output capacitors without external compensation.
Technical Context
The TPS54228DDAR implements D-CAP2™ mode control, combining adaptive on-time PWM with internal ripple injection to enable stable operation with ultra-low-ESR ceramic capacitors and eliminate need for external compensation. Its one-shot timer sets on-time inversely proportional to VIN and proportional to VOUT, sustaining ~700 kHz pseudo-fixed frequency across input and load variations.
It features dual-mode operation: continuous conduction mode (CCM) above ~0.3 A load and Auto-Skip Eco-Mode™ below that threshold-reducing switching losses while maintaining regulation. Protection includes valley-current-based OCP, non-latching UVLO (3.45–4.05 V), 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 industrial and consumer DC bus inputs including 5 V, 12 V, and 15 V rails. |
| Output Current | 2 A continuous - sufficient for core logic, SoC I/O, and DDR memory power in compact embedded systems. |
| Switching Frequency | 700 kHz - enables use of small 1.5–2.2 µH inductors and reduces EMI filter size vs lower-frequency converters. |
| FET On-Resistance | 155 mΩ (HS) / 108 mΩ (LS) - minimizes conduction loss and improves full-load efficiency in 12-V input applications. |
| Feedback Reference | 0.765 V ±1.7 mV - enables precise output regulation down to sub-1-V levels with standard resistor dividers. |
| Shutdown Current | 5–10 µA - ensures minimal system standby power draw in always-on consumer electronics. |
| Thermal Shutdown | 165°C with 35°C hysteresis - provides robust overtemperature protection without latch-up during transient overload. |
Pinout & Package
TPS54228DDAR is housed in an 8-pin HSOP (DDA) package measuring 4.89 mm × 3.90 mm with exposed thermal pad soldered to GND for enhanced thermal performance. The pinout supports standard buck converter layout with dedicated SW node, bootstrap supply (VBST), and separate power (PGND) and signal (SGND) ground returns.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 1) | Enable control input | Active-high logic input with 1.6 V threshold; internal 220–880 kΩ pull-down enables default disable when floating. |
| VFB (Pin 2) | Feedback sensing node | High-impedance input referenced to 0.765 V; connects to resistor divider for output voltage programming. |
| VREG5 (Pin 3) | Internal LDO output | 5.5-V regulated supply for gate drive and bias; requires 1-µF ceramic capacitor to GND; inactive when EN = low. |
| SS (Pin 4) | Soft-start timing node | 2-µA current source charges external capacitor to control ramp rate; supports prebiased start-up without sinking output. |
| GND (Pin 5) | Signal ground return | Dedicated SGND pin for sensitive analog nodes (VFB, SS); must be star-connected to thermal pad at single point. |
| SW (Pin 6) | Power switch node | Connection between internal high- and low-side FETs; drives external inductor; requires low-inductance routing. |
| VBST (Pin 7) | Bootstrap supply input | Connects via 0.1-µF ceramic capacitor to SW; powers high-side gate driver; internally diode-clamped to VREG5. |
| VIN (Pin 8) | Main input supply | Accepts 4.5–18 V; feeds internal circuitry and high-side FET; requires local 10-µF ceramic + bulk capacitance. |
Key Features
| Feature | Design Value |
|---|---|
| D-CAP2™ adaptive on-time control | Enables <10-µs transient response with no external compensation components and stable operation using only ceramic output capacitors. |
| Eco-Mode™ auto-skip operation | Reduces light-load quiescent current to <10 µA while maintaining regulation-critical for energy-efficient standby modes in consumer devices. |
| Prebiased soft-start | Prevents reverse current flow during startup into precharged outputs by gradually enabling synchronous rectification cycle-by-cycle. |
| Cycle-by-cycle overcurrent protection | Monitors low-side FET voltage during conduction to detect overcurrent; triggers non-latching shutdown after 7 consecutive fault cycles. |
| Integrated 5.5-V VREG5 LDO | Provides self-contained gate drive supply; eliminates need for external bias rail and simplifies BOM in isolated or multi-rail systems. |
Applications
| Digital TV Power Supply | Blu-ray Disc™ Player |
|---|---|
Use Scenario: Powers main SoC, video decoder, and HDMI interface in flat-panel TVs with 12-V input bus. IC Role / Device Role / Timing Role: Primary 1.05-V/2-A core voltage regulator with fast load-step response to handle video processing bursts. Use Value: D-CAP2™ control maintains <20-mV output deviation during 1-A transients, eliminating need for large bulk capacitance. |
Use Scenario: Supplies 1.2-V FPGA core and 3.3-V peripheral I/O in high-definition optical disc players. IC Role / Device Role / Timing Role: Dual-output capable via feedback reconfiguration; delivers regulated rails with <1% initial accuracy. Use Value: Eco-Mode™ extends battery-backed standby time by reducing idle current to single-digit µA range. |
| Networking Home Terminal | Digital Set Top Box (STB) |
Use Scenario: Provides 1.8-V PHY and 2.5-V memory interface power in cable/fiber gateway devices. IC Role / Device Role / Timing Role: Synchronous buck converter with integrated FETs replacing discrete controller + MOSFET solution. Use Value: 8-pin HSOP package with thermal pad achieves >1.5 W dissipation at 85°C ambient-enabling fanless enclosure design. |
Use Scenario: Generates 1.05-V processor core and 1.5-V DDR3 memory supply in satellite/cable STBs. IC Role / Device Role / Timing Role: High-efficiency step-down regulator supporting dynamic voltage scaling during channel change events. Use Value: Adjustable soft-start prevents inrush current exceeding 3 A during cold boot-protecting upstream 12-V DC/DC stage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54227DDAR | Same 8-pin HSOP package and D-CAP2™ architecture but rated for 1.7-A output; lower RDS(on) (140 mΩ HS / 95 mΩ LS). | Suitable where peak load is ≤1.7 A and board space is constrained; slightly higher light-load efficiency due to reduced conduction loss. | Select TPS54227DDAR if full 2-A capability is unnecessary and thermal margin allows tighter layout. |
| MP2307DN-LF-Z | Monolithic 2-A buck with 700-kHz fixed frequency, but uses voltage-mode control requiring external compensation; no Eco-Mode™ or prebias support. | Better suited for cost-sensitive designs where transient response <50 µs is not required and ceramic capacitor stability is verified. | Choose MP2307DN-LF-Z only when design prioritizes lowest BOM cost over advanced features like soft-start control or light-load efficiency. |
Compared with TPS54228DDAR, TPS54227DDAR offers identical footprint and feature set at reduced current rating, while MP2307DN-LF-Z trades control sophistication for lower unit cost-making TPS54228DDAR optimal for applications demanding fast transient response, prebiased startup, and sub-10-µA shutdown current.
Availability
TPS54228DDAR is available at Aetrix Electronics and suitable for digital TV power supplies, Blu-ray player subsystems, and networking home terminals requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for TPS54228DDAR 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 automotive-grade reliability.
The TPS54228DDAR belongs to TI's D-CAP2™ synchronous buck converter family, engineered specifically for high-density, low-noise consumer and industrial power rails where fast transient response and ceramic-capacitor compatibility are mandatory.
FAQ
What is the maximum output current capability of the TPS54228DDAR?
The TPS54228DDAR is rated for continuous 2-A output current under recommended operating conditions (TA ≤ 85°C, proper PCB layout, and adequate thermal relief). Its current limit threshold is 2.5–4.7 A depending on package and inductor value, providing headroom for short-duration transients without triggering protection.
Does the TPS54228DDAR support prebiased output startup?
Yes, the TPS54228DDAR includes proprietary prebiased soft-start circuitry. When the output voltage is already present at startup, it incrementally enables the low-side FET gate drive to avoid sinking current from the precharged rail-ensuring smooth, non-disruptive regulation acquisition in hot-plug or multi-rail sequencing scenarios.
What package type is used for the TPS54228DDAR?
The TPS54228DDAR uses an 8-pin HSOP (High-Speed Small Outline Package), also designated DDA, with dimensions of 4.89 mm × 3.90 mm and an exposed thermal pad on the underside. This package provides superior thermal performance versus standard SOIC and is optimized for automated assembly and high-power density layouts.
Can the TPS54228DDAR operate with only ceramic output capacitors?
Yes, the TPS54228DDAR is explicitly designed for ceramic output capacitors. Its D-CAP2™ control architecture injects internal ripple to maintain loop stability without relying on ESR, enabling use of low-ESR POSCAP, SP-CAP, or X5R/X7R ceramics-reducing board area and improving reliability versus electrolytic solutions.
What is the typical shutdown current of the TPS54228DDAR?
The TPS54228DDAR draws only 5–10 µA in shutdown mode (EN = low), as specified in the Electrical Characteristics table. This ultra-low quiescent current makes it ideal for battery-backed or always-on systems where standby power budget is tightly constrained.
TPS54228DDAR 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:
- 2A
- 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
TPS54228DDAR FAQ
1.How can I place an order for TPS54228DDAR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54228DDAR 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 TPS54228DDAR reliable?
The price and inventory of TPS54228DDAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54228DDAR is usually 5 days.
3.What payment methods are accepted for TPS54228DDAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54228DDAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54228DDAR?
TPS54228DDAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54228DDAR 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 TPS54228DDAR?
For technical support, including TPS54228DDAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54228DDAR requirements.
6.How does Aetrix verify that TPS54228DDAR is sourced from the original manufacturer or authorized distributors?
All TPS54228DDAR 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 TPS54228DDAR meets industry standards.
7.What is the process for return or replacement of TPS54228DDAR?
All TPS54228DDAR units undergo pre-shipment inspection (PSI). If there is an issue with TPS54228DDAR, 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 TPS54228DDAR part is unused and in its original packaging.
Return procedure for TPS54228DDAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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