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Texas Instruments TPS54228D
- Part No.:
- TPS54228D
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS54228D.pdf
- Description:
- IC REG BUCK ADJ 2A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:675
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Product details
Overview
TPS54228 from Texas Instruments is a 2-A synchronous step-down DC/DC converter with integrated high- and low-side N-channel MOSFETs, operating from 4.5 V to 18 V input and delivering adjustable output voltage from 0.76 V to 7 V. It uses D-CAP2™ adaptive on-time control for fast transient response, supports ceramic output capacitors, and features Eco-Mode™ for >90% efficiency at light loads 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 700-kHz pseudo-fixed switching frequency, cycle-by-cycle overcurrent protection, adjustable soft-start with prebias support, thermal shutdown at 165°C, and compatibility with low-ESR ceramic or polymer output capacitors.
Technical Context
The TPS54228 implements D-CAP2™ mode control-combining adaptive on-time PWM with internal compensation-to achieve stable regulation without external loop compensation components. Its proprietary circuitry enables seamless transition between continuous conduction mode (CCM) at full load and discontinuous conduction mode (DCM) during Eco-Mode™ operation.
It integrates two N-channel MOSFETs (155 mΩ high-side, 108 mΩ low-side), delivers up to 2 A output current, and includes dedicated VREG5 (5.5-V LDO), VBST bootstrap supply, and EN-controlled startup. Protection features include undervoltage lockout (UVLO) triggered by VREG5 voltage, non-latching thermal shutdown, and valley-current-based cycle-by-cycle overcurrent detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 18 V - supports wide industrial and consumer input rails including 5 V, 12 V, and 15 V systems. |
| Output Voltage Range | 0.76 V to 7 V - programmable via external resistor divider; enables core voltage regulation for SoCs and FPGAs. |
| Max Output Current | 2 A - sufficient for powering DDR memory, video processors, and system-on-chip (SoC) cores. |
| Switching Frequency | 700 kHz - fixed-frequency operation enables predictable EMI filtering and compact magnetics design. |
| High-Side RDS(on) | 155 mΩ (DDA/D packages) - reduces conduction loss at medium duty cycles; optimized for 5–12 V input to 1–3.3 V output. |
| Low-Side RDS(on) | 108 mΩ - complements high-side FET for efficient synchronous rectification and low dropout operation. |
| Quiescent Current | <10 µA in shutdown - minimizes standby power in always-on consumer electronics subsystems. |
| VFB Reference Accuracy | ±1.5% (749–781 mV) - ensures tight output voltage regulation across temperature and line/load conditions. |
Pinout & Package
TPS54228 is available in three package variants: 8-pin HSOP (DDA), 8-pin SOIC (D), and 10-pin VSON (DRC). All variants feature an exposed thermal pad connected to PGND (VSON) or GND (SOIC/HSOP) for enhanced thermal performance. The device operates over –40°C to +85°C ambient temperature.
| 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 (low) / 1.6 V (high). |
| VFB | Feedback input | Monitors output voltage via resistor divider; reference voltage is 765 mV; ±0.1 µA input bias minimizes divider error. |
| VREG5 | Internal LDO output | 5.5-V regulated supply for gate drivers; requires 1-µF ceramic capacitor to GND; inactive when EN = low. |
| SS | Soft-start control | External capacitor sets ramp time; 2 µA charge current enables precise start-up timing and prebias-safe startup. |
| GND | Power ground | Common return for SW, VFB, SS, and thermal pad; separate SGND/PGND routing recommended for noise isolation. |
| SW | Switch node | Connection point between high- and low-side FETs; drives external inductor; requires low-inductance layout to minimize ringing. |
| VBST | Bootstrap supply | Charged via internal diode from VREG5; requires 0.1-µF ceramic capacitor to SW for high-side gate drive. |
| VIN | Main input supply | Accepts 4.5–18 V; must be decoupled with ≥10-µF ceramic capacitor near pin; supports bulk + high-frequency filtering. |
Key Features
| Feature | Design Value |
|---|---|
| D-CAP2™ adaptive on-time control | Enables zero-external-compensation design with fast transient response (<10 µs) and stability with ceramic output capacitors. |
| Eco-Mode™ auto-skip operation | Reduces switching losses at light loads; maintains >85% efficiency down to 10 mA output while preserving regulation accuracy. |
| Integrated 5.5-V VREG5 LDO | Supplies internal gate drivers and bias circuits; eliminates need for external bias rail; shuts down with EN to reduce quiescent current. |
| Prebiased soft-start | Prevents reverse current flow during startup into precharged outputs; uses controlled low-side FET activation to avoid output voltage droop or overshoot. |
| Cycle-by-cycle overcurrent protection | Detects valley current through low-side FET VDS; latches off after 7 consecutive overcurrent events; non-latching recovery upon fault clearance. |
| Thermal shutdown with hysteresis | Shuts down at 165°C junction temperature; restarts automatically after cooling by 35°C; prevents thermal runaway in enclosed environments. |
Applications
| Digital TV Power Supply | Blu-ray Disc™ Player Power |
|---|---|
Use Scenario: Powers main SoC, DDR memory, and video decoder in 4K UHD television platforms requiring clean, low-noise 1.05 V and 1.2 V rails. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering 2 A at 1.05 V with <20 mVpp ripple; replaces discrete controller + MOSFET solutions. Use Value: D-CAP2™ control ensures sub-50 mV output deviation during dynamic video scene changes; Eco-Mode™ cuts standby power by 40% vs fixed-frequency alternatives. | Use Scenario: Supplies HDMI PHY, laser driver, and ARM-based media processor in portable and home Blu-ray players with strict thermal limits. IC Role / Device Role / Timing Role: High-efficiency 1.8 V/2 A buck converter with thermal shutdown and UVLO; operates from 12 V adapter input. Use Value: Integrated 155 mΩ/108 mΩ FETs reduce board area and thermal footprint; VSON package enables compact 3×3 mm layout with 43.9°C/W θJA. |
| Networking Home Terminal | Digital Set Top Box (STB) |
Use Scenario: Regulates 3.3 V and 5 V rails for Ethernet PHY, Wi-Fi module, and microcontroller in cable/fiber gateway devices. IC Role / Device Role / Timing Role: Dual-rail solution using multiple TPS54228s; one configured for 3.3 V @ 2 A, another for 5 V @ 2 A with independent enable control. Use Value: Adjustable soft-start prevents inrush current tripping upstream fuses; 700-kHz switching allows small 2.2 µH inductors and 22–68 µF ceramic output caps. | Use Scenario: Provides 1.2 V core voltage for MPEG decoder SoC and 3.3 V I/O rail in satellite/cable STBs with 24/7 operation requirements. IC Role / Device Role / Timing Role: Main processor core regulator with prebias soft-start to avoid brownout during cold boot from powered USB peripherals. Use Value: Prebiased startup avoids output collapse when STB powers on with active HDMI sink; VREG5 powers auxiliary circuits without extra LDO. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54227 | Same D-CAP2™ architecture but rated for 1.7 A max output; lower RDS(on) (130 mΩ HS / 90 mΩ LS); no VREG5 output. | Lacks integrated 5.5-V LDO; requires external bias supply for gate drivers; suitable only where VREG5 is not needed. | Select TPS54227 only if output current ≤1.7 A and external bias rail is available; not drop-in compatible due to missing VREG5 functionality. |
| MP2307DN | Fixed 500-kHz frequency; external compensation required; 2 A rating; 110 mΩ/90 mΩ FETs; no Eco-Mode™ or prebias soft-start. | Higher light-load inefficiency; less robust transient response; requires additional compensation components and layout tuning. | Choose MP2307DN only for cost-sensitive designs accepting higher BOM count and reduced light-load efficiency; not functionally equivalent. |
Compared with TPS54227 and MP2307DN, the TPS54228 uniquely combines 2-A capability, integrated VREG5, Eco-Mode™, and prebias soft-start in a single 8- or 10-pin package-enabling simpler, more reliable, and thermally efficient designs for consumer multimedia power systems.
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, long-term manufacturability, and TI-qualified automotive-grade reliability screening.
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 ICs, embedded processors, and DLP® technology 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 DC/DC conversion in space-constrained consumer electronics with stringent light-load and transient performance requirements.
FAQ
What is the maximum output current supported by the TPS54228?
The TPS54228 is rated for continuous 2-A output current under recommended operating conditions (–40°C to 85°C ambient, proper PCB layout, and thermal management). Its current limit threshold ranges from 2.3 A to 4.7 A depending on package and inductor value, but sustained operation above 2 A may require derating based on thermal performance and ambient temperature per Figure 9 in the datasheet.
Does the TPS54228 require external compensation components?
No, the TPS54228 does not require external compensation components. Its D-CAP2™ adaptive on-time control architecture provides inherent stability with ceramic output capacitors, eliminating the need for traditional Type II or Type III compensation networks. This simplifies design, reduces BOM count, and improves transient response without loop tuning.
Can the TPS54228 safely start up into a prebiased output voltage?
Yes, the TPS54228 supports prebiased soft-start. Its internal circuitry detects when the feedback voltage exceeds the soft-start ramp and gradually enables the low-side FET with increasing on-time-preventing reverse current flow and ensuring monotonic output voltage rise. This protects downstream circuitry and avoids latch-up during hot-plug or multi-rail sequencing scenarios.
What is the purpose of the VREG5 pin on the TPS54228?
The VREG5 pin on the TPS54228 provides a regulated 5.5-V output used internally to power gate drivers and bias circuits. It can also supply external circuitry up to 10 mA. A 1-µF ceramic capacitor must be placed between VREG5 and GND. When EN is low, VREG5 is disabled, reducing total shutdown current to <10 µA.
How does Eco-Mode™ improve efficiency at light loads in the TPS54228?
Eco-Mode™ in the TPS54228 disables switching pulses during light-load conditions, allowing the output capacitor to sustain the load with minimal energy loss. This pulse-skipping behavior reduces switching losses and maintains >85% efficiency down to 10 mA output current-significantly outperforming forced-PWM converters that continue switching regardless of load.
TPS54228D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- D-CAP2™, Eco-Mode™
- Package/Case:
- 8-SOIC (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:
- 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
TPS54228D FAQ
1.How can I place an order for TPS54228D through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54228D 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 TPS54228D reliable?
The price and inventory of TPS54228D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54228D is usually 5 days.
3.What payment methods are accepted for TPS54228D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54228D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54228D?
TPS54228D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54228D 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 TPS54228D?
For technical support, including TPS54228D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54228D requirements.
6.How does Aetrix verify that TPS54228D is sourced from the original manufacturer or authorized distributors?
All TPS54228D 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 TPS54228D meets industry standards.
7.What is the process for return or replacement of TPS54228D?
All TPS54228D units undergo pre-shipment inspection (PSI). If there is an issue with TPS54228D, 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 TPS54228D part is unused and in its original packaging.
Return procedure for TPS54228D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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