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Texas Instruments TPS54427DDA
- Part No.:
- TPS54427DDA
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS54427DDA.pdf
- Description:
- IC REG BUCK ADJ 4A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:184
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Product details
Overview
TPS54427DDA from Texas Instruments is a 4-A synchronous step-down DC/DC converter with integrated high- and low-side N-channel MOSFETs, operating in D-CAP2™ adaptive on-time mode. It delivers regulated output voltages from 0.76 V to 7.0 V across a 4.5–18-V input range, supports ceramic output capacitors, and achieves 650-kHz switching frequency with cycle-by-cycle overcurrent protection - deployed in digital TV power supplies and Blu-ray disc players.
For engineers reviewing the TPS54427DDA datasheet, TPS54427DDA pinout, TPS54427DDA application, or TPS54427DDA equivalent, key selection criteria include its SO PowerPAD™ (DDA) package thermal performance, adjustable soft-start timing, pre-biased startup capability, and compatibility with ultra-low-ESR ceramic output capacitors in space-constrained consumer electronics designs.
Technical Context
The TPS54427DDA implements D-CAP2™ control architecture - an adaptive on-time PWM scheme that eliminates external compensation while enabling fast transient response and stable operation with ceramic or polymer output capacitors. Its internal one-shot timer sets on-time inversely proportional to VIN and proportional to VOUT, yielding quasi-fixed 650-kHz operation without a dedicated oscillator.
It integrates 70-mΩ high-side and 53-mΩ low-side MOSFETs optimized for lower duty-cycle applications, features temperature-compensated valley-current sensing for cycle-by-cycle OCP, and includes non-latching UVLO (3.45–4.05 V) and thermal shutdown (170°C threshold) 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 rails including 5 V, 12 V, and 15 V bus systems. |
| Output Current | 4 A continuous - sufficient for powering SoCs, FPGAs, and DDR memory subsystems in embedded video systems. |
| Switching Frequency | 650 kHz - enables compact magnetics and predictable EMI filtering while balancing efficiency and size. |
| High-Side RDS(on) | 70 mΩ at 25°C - reduces conduction loss in high-duty-cycle conditions and improves light-load efficiency. |
| Low-Side RDS(on) | 53 mΩ at 25°C - minimizes synchronous rectification losses and supports forced CCM operation down to zero load. |
| VFB Reference Accuracy | ±0.8% (751–779 mV over –40°C to 85°C) - ensures tight output voltage regulation across temperature and line/load variations. |
| Shutdown Current | <10 µA - enables ultra-low-power standby modes in always-on consumer devices. |
Pinout & Package
TPS54427DDA uses the 8-pin SO PowerPAD™ (DDA) package (4.89 mm × 3.90 mm), featuring an exposed thermal pad on the underside soldered directly to PCB ground for enhanced thermal dissipation (RθJB = 31.8°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN | Enable control input | Active-high logic input; internal 225–900 kΩ pull-down enables default disable; must exceed 1.6 V to activate regulator. |
| 2 VFB | Feedback voltage sense | Connects to resistor divider from output; 0.765-V reference enables precise output programming with minimal error budget. |
| 3 VREG5 | Internal 5.5-V LDO output | Powers gate drivers and internal circuitry; requires 1-µF ceramic capacitor to GND; inactive when EN = low. |
| 4 SS | Soft-start timing control | External capacitor to GND sets ramp time; 6-µA internal current source enables programmable startup slew rate and pre-biased handling. |
| 5 GND | Power ground return | Common return for switching path; sensitive analog returns (SS, VFB) must tie to this pin at single-point star ground. |
| 6 SW | Switch node | Connection between integrated high- and low-side FETs; routes high di/dt current; requires tight layout to minimize ringing. |
| 7 VBST | Bootstrap supply for high-side gate | Connected via 0.1-µF ceramic capacitor to SW; internal diode charges from VREG5; critical for high-side FET turn-on reliability. |
| 8 VIN | Main input supply | Accepts 4.5–18 V; requires local 10-µF ceramic decoupling; shares thermal pad connection with exposed die pad (PGND). |
Key Features
| Feature | Design Value |
|---|---|
| D-CAP2™ adaptive on-time control | Enables <10-µs transient response without external compensation components, reducing BOM count and layout sensitivity. |
| Ceramic capacitor compatibility | Proprietary ripple-simulation circuit allows stable operation with ultra-low-ESR ceramic outputs, eliminating need for POSCAP/SP-CAP alternatives. |
| Pre-biased soft start | Prevents reverse current flow during startup into pre-charged outputs - essential for hot-swap and multi-rail sequencing applications. |
| Integrated 70-mΩ / 53-mΩ FETs | Optimized RDS(on) ratio minimizes conduction loss across duty cycles, supporting >90% peak efficiency at 4-A load and 12-V input. |
| Cycle-by-cycle overcurrent protection | Valley-current sensing with temperature compensation provides accurate, repeatable current limiting without external sense resistors. |
Applications
| Digital TV Power Supply | Blu-ray Disc Player |
|---|---|
Use Scenario: Powers main SoC and video processing ASIC from 12-V input rail under dynamic video decoding loads. IC Role / Device Role / Timing Role: Primary 1.05-V/4-A buck regulator delivering tightly regulated core voltage with sub-15-mVpp ripple. Use Value: D-CAP2™ fast transient response maintains voltage within ±1% during rapid scene-change current spikes up to 3-A/µs. |
Use Scenario: Supplies 1.2-V FPGA core and 3.3-V interface logic in portable optical disc playback units. IC Role / Device Role / Timing Role: Dual-output capable via feedback reconfiguration; operates in forced CCM for stable light-load efficiency. Use Value: Pre-biased soft start prevents output collapse during hot insertion of USB-connected peripherals. |
| Networking Home Terminal | Digital Set Top Box (STB) |
Use Scenario: Generates 1.8-V CPU core and 1.0-V DDR3 memory rails in cable modem/router gateways. IC Role / Device Role / Timing Role: High-efficiency synchronous buck with integrated FETs replaces discrete controller + external MOSFET solution. Use Value: 42.1°C/W junction-to-ambient thermal resistance enables full 4-A output in compact 4-layer PCB without heatsink. |
Use Scenario: Delivers 2.5-V tuner and 1.5-V demodulator supply in energy-efficient STB platforms meeting EU ErP Tier 2 standards. IC Role / Device Role / Timing Role: Low 10-µA shutdown current supports deep sleep modes during channel standby. Use Value: Adjustable soft start (via SS pin) eliminates inrush current-induced brownouts during wake-from-sleep transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54327DDA | 3-A output rating, identical D-CAP2™ control, same DDA package and pinout. | Suitable for lower-current applications where 4-A headroom is unnecessary; 10% smaller solution footprint due to reduced inductor/capacitor sizing. | Select when system load remains ≤3 A and cost reduction is prioritized over future-proofing. |
| MP2315DJ-LF-Z | Monolithic 4-A buck with 4.5–28-V input, fixed 650-kHz frequency, no pre-biased soft start, different pinout. | Used in industrial controls requiring wider input range; lacks D-CAP2™ transient performance and ceramic-capacitor optimization. | Choose only if input exceeds 18 V or if TI ecosystem compatibility is not required; requires PCB redesign. |
Compared with TPS54427DDA, TPS54327DDA offers identical functionality at reduced current capacity and cost, while MP2315DJ-LF-Z trades transient performance and design simplicity for extended input voltage range and non-TI sourcing - making TPS54427DDA optimal for consumer video applications demanding fast load steps and ceramic capacitor integration.
Availability
TPS54427DDA is available at Aetrix Electronics and suitable for digital TV power supplies, Blu-ray disc players, and networking home terminals requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for TPS54427DDA 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 and embedded processing technologies, with decades of expertise in power management ICs for consumer, industrial, and automotive markets.
The TPS54427DDA belongs to TI's D-CAP2™ synchronous buck converter product line, engineered specifically for high-transient, low-ESR-capacitor applications in space-constrained consumer electronics where fast response, small solution size, and ease of design are critical.
FAQ
What is the maximum output current supported by the TPS54427DDA?
The TPS54427DDA is rated for 4-A continuous output current under recommended operating conditions (TA = –40°C to 85°C, proper PCB thermal design). Its cycle-by-cycle overcurrent limit triggers at 4.6–6.8 A depending on temperature and layout, but sustained operation above 4 A requires derating per thermal metrics - notably RθJB = 31.8°C/W - and adequate copper area on the exposed thermal pad.
Does the TPS54427DDA support pre-biased output startup?
Yes, the TPS54427DDA includes proprietary pre-biased soft start circuitry. When the output voltage is already present at startup, the device gradually enables synchronous rectification by incrementing low-side FET on-time cycle-by-cycle, preventing reverse current flow and ensuring monotonic VOUT ramp-up - a critical feature for multi-rail systems and hot-plug applications.
What capacitor types are compatible with the TPS54427DDA output stage?
The TPS54427DDA is explicitly designed for ultra-low-ESR ceramic capacitors (e.g., X5R/X7R 22–68 µF), as well as POSCAP and SP-CAP polymer types. Its D-CAP2™ control loop includes internal ripple simulation, eliminating dependency on ESR-induced output ripple for stability - unlike traditional voltage-mode controllers that require higher-ESR tantalum or aluminum electrolytics.
Can the TPS54427DDA operate with an input voltage below 4.5 V?
No - the TPS54427DDA has a minimum recommended input voltage of 4.5 V, enforced by its undervoltage lockout (UVLO) circuit tied to the VREG5 rail. The UVLO threshold is 3.45–4.05 V on VREG5, which corresponds to ~4.5 V on VIN. Operation below this risks improper gate drive, unstable regulation, or automatic shutdown; it is not characterized or guaranteed below 4.5 V.
What is the purpose of the VBST pin on the TPS54427DDA?
The VBST pin supplies the bootstrap voltage for the high-side N-channel MOSFET gate driver. A 0.1-µF ceramic capacitor must be placed between VBST and SW to generate the ~5.5-V gate drive above the switch node voltage. This charge pump configuration enables efficient high-side FET operation without requiring a floating supply, and the internal diode from VREG5 to VBST simplifies biasing during startup.
TPS54427DDA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SWIFT™, D-CAP2™
- 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
TPS54427DDA FAQ
1.How can I place an order for TPS54427DDA through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54427DDA 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 TPS54427DDA reliable?
The price and inventory of TPS54427DDA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54427DDA is usually 5 days.
3.What payment methods are accepted for TPS54427DDA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54427DDA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54427DDA?
TPS54427DDA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54427DDA 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 TPS54427DDA?
For technical support, including TPS54427DDA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54427DDA requirements.
6.How does Aetrix verify that TPS54427DDA is sourced from the original manufacturer or authorized distributors?
All TPS54427DDA 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 TPS54427DDA meets industry standards.
7.What is the process for return or replacement of TPS54427DDA?
All TPS54427DDA units undergo pre-shipment inspection (PSI). If there is an issue with TPS54427DDA, 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 TPS54427DDA part is unused and in its original packaging.
Return procedure for TPS54427DDA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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