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Texas Instruments TPS54427DDAR
- Part No.:
- TPS54427DDAR
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS54427DDAR.pdf
- Description:
- IC REG BUCK ADJ 4A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:14,134
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Product details
Overview
TPS54427DDAR from Texas Instruments is a 4.5-V to 18-V input, 4-A synchronous step-down DC/DC converter with integrated high-side (70 mΩ) and low-side (53 mΩ) N-channel MOSFETs, D-CAP2™ adaptive on-time control, 650-kHz switching frequency, and 0.76-V to 7.0-V adjustable output voltage. It delivers stable power in space-constrained consumer electronics such as digital set-top boxes and Blu-ray disc players.
For engineers reviewing the TPS54427DDAR datasheet, TPS54427DDAR pinout, TPS54427DDAR application, or TPS54427DDAR equivalent, key selection criteria include its D-CAP2™ fast transient response, ceramic-capacitor compatibility, pre-biased soft-start capability, cycle-by-cycle overcurrent protection, and SO PowerPAD™ thermal performance at –40°C to 85°C.
Technical Context
The TPS54427DDAR implements adaptive on-time D-CAP2™ control-no external compensation required-using VIN and VOUT to dynamically set on-time for pseudo-fixed 650-kHz operation. Its internal circuitry supports both ultra-low-ESR ceramic and polymer capacitors without ripple injection.
It features cycle-by-cycle valley-current sensing via low-side FET voltage monitoring, non-latching thermal shutdown at 170°C, undervoltage lockout referenced to VREG5 (3.45–4.05 V), and adjustable soft-start with 6-µA charge current into the SS pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 18 V - supports wide-input industrial and consumer rails including 5 V, 12 V, and 15 V supplies. |
| Output Current | 4 A continuous - sufficient for core logic, SoC I/O, and DDR memory rails in embedded systems. |
| Switching Frequency | 650 kHz - enables compact magnetics and predictable EMI filtering while balancing efficiency and size. |
| Feedback Reference | 765 mV ±6 mV - high-accuracy bandgap reference ensures tight output regulation across temperature. |
| High-Side RDS(on) | 70 mΩ - reduces conduction loss in high-duty-cycle applications (e.g., 3.3 V out from 12 V in). |
| Low-Side RDS(on) | 53 mΩ - minimizes bottom-FET loss during synchronous rectification, improving light-load efficiency. |
| Shutdown Current | <10 µA - enables ultra-low-power standby modes in battery-backed or always-on systems. |
Pinout & Package
TPS54427DDAR uses the 8-pin SO PowerPAD™ package (4.89 mm × 3.90 mm) with exposed thermal pad soldered to PCB ground for enhanced thermal dissipation (RθJB = 31.8°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | Enable input | Active-high logic control; internal 225–900 kΩ pull-down enables default disable; 1.6 V threshold ensures noise immunity. |
| VFB | Feedback input | Monitors output via resistor divider; 0.765 V reference sets output voltage; ±0.1 µA input bias minimizes divider error. |
| VREG5 | Internal 5.5-V LDO output | Powers gate drivers and internal logic; requires 1-µF ceramic capacitor; inactive when EN = low. |
| SS | Soft-start control | 6-µA current source charges external capacitor; enables adjustable ramp time and pre-biased startup. |
| GND | Power ground | Common return for SW, VFB, and SS; must be connected at single point to minimize noise coupling. |
| SW | Switch node | Connects between internal high- and low-side FETs; drives external inductor; requires low-inductance layout. |
| VBST | Bootstrap supply | Charged via internal diode from VREG5; 0.1-µF capacitor to SW provides high-side gate drive voltage. |
| VIN | Main input supply | Accepts 4.5–18 V; requires local 10-µF ceramic decoupling and optional 0.1-µF HF bypass. |
Key Features
| Feature | Design Value |
|---|---|
| D-CAP2™ Control | Eliminates external compensation components and enables sub-10-µs load transient response with ceramic output capacitors. |
| Pre-Biased Soft Start | Prevents reverse current flow during startup when output is already biased; avoids system reset or rail collapse. |
| Cycle-by-Cycle OCP | Valley-current sensing on low-side FET provides accurate, temperature-compensated overcurrent protection without sense resistors. |
| Thermal Shutdown | Non-latching 170°C cutoff with 35°C hysteresis prevents thermal runaway while allowing recovery after cooling. |
| VIN UVLO | Tracks VREG5 voltage (3.45–4.05 V); ensures stable internal bias before enabling switching, avoiding erratic startup. |
Applications
| Digital Set-Top Box (STB) | Blu-ray Disc™ Player |
|---|---|
Use Scenario: Powers video decoder SoC core and memory interface at 1.05 V/4 A with tight ripple (<15 mVPP) under dynamic video decoding loads. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated core voltage; D-CAP2™ ensures rapid response to bursty CPU/GPU current demands. Use Value: Enables use of low-profile ceramic capacitors instead of bulkier electrolytics, reducing board area by >30% and eliminating ESR-related aging concerns. | Use Scenario: Supplies HDMI PHY and audio DSP at 3.3 V with <±0.5% line/load regulation across 5–12 V input variations. IC Role / Device Role / Timing Role: Secondary buck stage converting 12 V rail to clean 3.3 V; VREG5 powers auxiliary logic, simplifying BOM. Use Value: Pre-biased soft start prevents HDMI hot-plug glitches; 650-kHz switching allows small 1.5-µH inductor and 22-µF ceramic output caps. |
| Digital Television Power Supply | Networking Home Terminal |
Use Scenario: Generates 1.2 V/3 A for ARM-based media processor in smart TV platforms operating from 12 V wall adapter. IC Role / Device Role / Timing Role: High-efficiency main processor rail; SO PowerPAD™ package dissipates heat directly to PCB ground plane. Use Value: 70 mΩ/53 mΩ integrated FETs achieve >92% peak efficiency at 1.2 V/3 A, reducing thermal design burden vs discrete solutions. | Use Scenario: Provides 5 V/2 A for Ethernet PHY and Wi-Fi module in residential gateway, handling 1-A load steps during packet bursts. IC Role / Device Role / Timing Role: Standalone buck converter with EN-controlled sequencing; SS pin enables synchronized power-up with baseband controller. Use Value: Adjustable soft start (via SS capacitor) eliminates inrush current spikes that could destabilize upstream 5-V supply or trigger overcurrent faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54327DDAR | 3-A output rating; identical D-CAP2™ control, package, and pinout; lower RDS(on) (60 mΩ HS / 42 mΩ LS). | Suitable where 3-A max load suffices; slightly higher efficiency at light loads due to lower FET resistance. | Select when full 4-A capability is unnecessary and board space or cost optimization is prioritized. |
| MP2307DN-LF-Z | 4-A rating but fixed 500-kHz frequency; external compensation required; no VREG5 LDO or pre-biased soft start. | Lacks integrated bias rail and advanced startup features; requires additional components for robustness in complex systems. | Consider only for cost-sensitive, non-critical applications where D-CAP2™ simplicity and VREG5 integration are not required. |
Compared with TPS54327DDAR, the TPS54427DDAR delivers higher output current and better thermal margin in the same footprint; versus MP2307DN-LF-Z, it offers superior transient response, reduced component count, and built-in system-level features like pre-biased startup and internal LDO.
Availability
TPS54427DDAR is available at Aetrix Electronics and suitable for digital television power supplies, Blu-ray disc player designs, and networking home terminals requiring stable component supply, long-term manufacturability, and TI-qualified automotive-grade reliability.
Supply support for TPS54427DDAR 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 designing analog ICs, embedded processors, and connectivity solutions for industrial, automotive, and consumer markets.
The TPS54427 belongs to TI's D-CAP2™ synchronous buck converter product line, engineered for high-efficiency, low-component-count DC/DC regulation in space-constrained consumer electronics with demanding transient response requirements.
FAQ
What is the maximum output current supported by the TPS54427DDAR?
The TPS54427DDAR supports up to 4 A of continuous output current under recommended operating conditions (TA ≤ 85°C, proper PCB thermal design). Its current limit is specified at 4.6–6.8 A depending on temperature and test conditions, and thermal shutdown activates at 170°C junction temperature to protect against overload.
Does the TPS54427DDAR require external compensation components?
No, the TPS54427DDAR uses D-CAP2™ adaptive on-time control architecture, which eliminates the need for external compensation components such as type-II or type-III networks. This simplifies design, reduces BOM count, and ensures stability with ceramic output capacitors without ESR dependency.
Can the TPS54427DDAR safely start up into a pre-biased output voltage?
Yes, the TPS54427DDAR includes proprietary pre-biased soft-start circuitry. When the output is already biased above the target regulation voltage at startup, it gradually enables synchronous rectification using narrow low-side gate pulses, preventing reverse current flow and ensuring smooth, glitch-free ramp-up to regulation.
What package type and thermal characteristics does the TPS54427DDAR use?
The TPS54427DDAR is packaged in an 8-pin SO PowerPAD™ (DDA) with a 4.89 mm × 3.90 mm body and exposed thermal pad. Its junction-to-board thermal resistance (RθJB) is 31.8°C/W, enabling efficient heat transfer to the PCB ground plane when the thermal pad is properly soldered and thermally connected.
How is the output voltage programmed on the TPS54427DDAR?
The output voltage of the TPS54427DDAR is set using a resistor divider from VOUT to the VFB pin. With a precise 765-mV internal reference, the formula is VOUT = 0.765 V × (1 + R1/R2). TI recommends 1% tolerance resistors and provides optimized R1/R2 values for common outputs (e.g., 1.05 V, 1.2 V, 3.3 V) in the datasheet.
TPS54427DDAR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SWIFT™, D-CAP2™
- 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:
- 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
TPS54427DDAR FAQ
1.How can I place an order for TPS54427DDAR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54427DDAR 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 TPS54427DDAR reliable?
The price and inventory of TPS54427DDAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54427DDAR is usually 5 days.
3.What payment methods are accepted for TPS54427DDAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54427DDAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54427DDAR?
TPS54427DDAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54427DDAR 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 TPS54427DDAR?
For technical support, including TPS54427DDAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54427DDAR requirements.
6.How does Aetrix verify that TPS54427DDAR is sourced from the original manufacturer or authorized distributors?
All TPS54427DDAR 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 TPS54427DDAR meets industry standards.
7.What is the process for return or replacement of TPS54427DDAR?
All TPS54427DDAR units undergo pre-shipment inspection (PSI). If there is an issue with TPS54427DDAR, 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 TPS54427DDAR part is unused and in its original packaging.
Return procedure for TPS54427DDAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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