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Texas Instruments TPS5450DDAG4
- Part No.:
- TPS5450DDAG4
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS5450DDAG4.pdf
- Description:
- IC REG BUCK ADJ 5A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:2,068
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Product details
Overview
TPS5450DDAG4 from Texas Instruments is a 5-A, wide-input-range synchronous step-down (buck) DC/DC converter with an integrated 110-mΩ high-side N-channel MOSFET, fixed 500-kHz switching frequency, 1.221-V internal reference (±1.5% initial accuracy), and operation from 5.5 V to 36 V input. It delivers regulated 5-V output at full load in LCD display power rails.
For engineers reviewing the TPS5450DDAG4 datasheet, TPS5450DDAG4 pinout, TPS5450DDAG4 application, or TPS5450DDAG4 equivalent, key selection criteria include input voltage range compliance, thermal performance in SOIC PowerPAD™, enable/shutdown behavior, internal compensation suitability for low-external-component designs, and overcurrent hiccup-mode response under short-circuit conditions.
Technical Context
The TPS5450DDAG4 implements constant-frequency voltage-mode control with integrated voltage feed-forward to maintain stable loop gain across input variations-feed-forward gain is 25. Its internal slow-start ramps the reference linearly over 8 ms typical to limit inrush current and output overshoot.
Protection architecture includes cycle-by-cycle overcurrent limiting (6–9 A trip), overvoltage protection triggered at 112.5% × VREF, thermal shutdown at 135–162°C with 14°C hysteresis, and undervoltage lockout with 5.3 V start threshold and 330 mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5.5 V to 36 V - supports direct connection to 12-V and 24-V industrial bus rails without pre-regulation. |
| Output Current | 5 A continuous / 6 A peak - sufficient for powering FPGA core rails or multi-channel display backlight drivers. |
| Switching Frequency | 500 kHz ±100 kHz - enables compact LC filter design with standard 10–15 µH inductors and ≤22 µF ceramic output capacitors. |
| Voltage Reference | 1.221 V ±1.5% at 25°C - sets minimum adjustable output; combined with external resistor divider, achieves tight regulation (e.g., 5.0 V ±2% over line/load/temp). |
| Shutdown Current | 18 µA typical - allows battery-backed systems to maintain >1-year standby life when disabled via ENA pin. |
| Thermal Resistance | RθJA = 30°C/W (custom board) - requires exposed PowerPAD soldered to ≥4 thermal vias for full 5-A operation at 125°C junction temperature. |
| MOSFET rDS(on) | 110 mΩ typical at 5.5 V - contributes to >90% efficiency at 12 VIN/5 VOUT, 3 A, reducing heat sink requirements. |
Pinout & Package
TPS5450DDAG4 uses an 8-pin HSOP (DDA) package with thermally enhanced PowerPAD™ (Pin 9, exposed bottom pad). Package dimensions are 4.89 mm × 3.90 mm. The PowerPAD must be soldered to PCB ground plane for electrical and thermal integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOT | Bootstrap capacitor node | Connects 0.01-µF X7R/X5R ceramic between BOOT and PH to supply gate drive for integrated high-side MOSFET. |
| NC (2,3) | No-connect | Internally unconnected; must remain floating or grounded-no routing or trace required. |
| VSENSE | Feedback input | Monitors output voltage divider midpoint; regulates output by comparing to 1.221-V internal reference. |
| ENA | Enable control | Active-high logic: ≥1.3 V enables, ≤0.5 V disables; internal pullup allows floating for default-on operation. |
| GND | Power ground | Reference for all internal circuits; connects directly to PowerPAD for lowest impedance return path. |
| VIN | Main input supply | Accepts 5.5–36 V; requires local 4.7-µF ceramic bypass capacitor placed within 5 mm of pin. |
| PH | Power switch node | Drives external inductor; carries high di/dt switching current-requires short, wide copper pour and Kelvin return to GND. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high-side MOSFET | 110-mΩ rDS(on) eliminates external switch, reduces BOM count, and simplifies layout for high-current buck stages. |
| Internal compensation | Type-3 network embedded on-die-removes need for external compensation components and avoids stability tuning during prototyping. |
| Voltage feed-forward | Fixed gain of 25 improves transient response to input voltage steps and simplifies loop analysis across 5.5–36 V input range. |
| Hiccup-mode overcurrent protection | After 13–20 ms fault duration, device shuts down, cools, then auto-restarts-prevents thermal runaway during sustained overload or short circuit. |
| Thermally enhanced PowerPAD™ | Exposed pad (Pin 9) provides <0.8°C/W RθJC(bot)-enables 5-A operation without heatsink when properly soldered to 2-oz copper plane with ≥4 thermal vias. |
Applications
| High-Density Point-of-Load Regulator | LCD/Plasma Display Power |
|---|---|
Use Scenario: Compact DC/DC conversion near FPGA or ASIC core to minimize IR drop and noise coupling. IC Role / Device Role / Timing Role: Primary buck regulator delivering 1.2 V @ 5 A with fast transient response to dynamic load changes. Use Value: Internal compensation and 500-kHz switching allow <1 cm² solution size; 1.221-V reference enables accurate core voltage setting within ±2% tolerance. | Use Scenario: Generating 5-V and 12-V bias rails for TFT-LCD column drivers and timing controllers. IC Role / Device Role / Timing Role: Main 5-V supply for display logic and interface ICs; operates from 12-V or 24-V system rail. Use Value: Wide 5.5–36 V input range accepts unregulated industrial bus; hiccup-mode OCP prevents damage during panel ESD events. |
| Battery Charger Front-End | 12/24-V Distributed Power System |
Use Scenario: Pre-regulating variable solar or vehicle battery voltage (9–32 V) to stable 5-V for USB-C PD controller and charging IC. IC Role / Device Role / Timing Role: Input-stage buck converter providing clean, regulated input to downstream charger IC. Use Value: UVLO with 5.3-V start and 330-mV hysteresis ensures reliable startup even as battery discharges; 18-µA shutdown extends battery life during idle. | Use Scenario: Local 5-V rail generation in industrial PLC backplanes or telecom shelf cards powered from centralized 12-V or 24-V distribution bus. IC Role / Device Role / Timing Role: Isolated point-of-load regulator converting distributed bus voltage to logic supply for microcontrollers and sensors. Use Value: SOIC PowerPAD™ package supports automated reflow and meets IPC Class 2 reliability; -40°C to 125°C junction rating suits harsh environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS5450DDAR | Same silicon, tape-and-reel packaging (vs. tube for DDAG4); identical electrical specs and pinout. | No functional difference-used interchangeably where packaging format aligns with production assembly method. | Select DDAR for SMT pick-and-place lines requiring reel-fed feeders; DDAG4 suits manual or small-batch insertion. |
| LM2678-5.0 | Fixed 5-V output (non-adjustable), 5-A rating, 260-mΩ MOSFET, 260-kHz switching, no internal compensation. | Lacks adjustable output, feed-forward, and hiccup-mode OCP-less suitable for dynamic loads or wide-input systems. | Choose LM2678-5.0 only for cost-sensitive, fixed-output applications where 5-V is mandatory and input stays near 12 V. |
Compared with TPS5450DDAG4, TPS5450DDAR offers identical performance in reel format for high-volume automation, while LM2678-5.0 trades adjustability, efficiency, and protection features for lower unit cost in static 5-V applications.
Availability
TPS5450DDAG4 is available at Aetrix Electronics and suitable for high-density point-of-load regulators, LCD display power supplies, and 12-V/24-V distributed power systems requiring stable component supply, long-term manufacturability, and TI-qualified automotive-grade reliability.
Supply support for TPS5450DDAG4 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 power management solutions for industrial, automotive, and communications markets.
The TPS5450 product line delivers highly integrated, thermally robust buck converters targeting space-constrained, high-current applications where simplicity, reliability, and wide input range are critical.
FAQ
What is the absolute maximum input voltage rating for the TPS5450DDAG4?
The TPS5450DDAG4 has an absolute maximum VIN rating of 40 V, but recommended operating input voltage is limited to 5.5 V–36 V. Exceeding 36 V risks triggering overvoltage protection or damaging internal circuitry, especially during transients. Always use input filtering and clamping if system-level surges exceed 36 V.
Does the TPS5450DDAG4 require an external bootstrap diode?
No, the TPS5450DDAG4 integrates the bootstrap recharge diode internally. Only a 0.01-µF X7R/X5R ceramic capacitor between BOOT and PH pins is required. Adding an external diode is unnecessary and may interfere with proper gate drive operation.
Can the TPS5450DDAG4 operate with an input voltage below 5.5 V?
The TPS5450DDAG4 incorporates undervoltage lockout (UVLO) with a typical start threshold of 5.3 V and hysteresis of 330 mV. Operation below 5.3 V is disabled; at 5.3–5.5 V, functionality is marginal and not guaranteed across temperature or process variation. Design for ≥5.5 V nominal input.
How is thermal performance affected if the PowerPAD is not soldered?
If the PowerPAD (Pin 9) is not soldered to the PCB ground plane, RθJC(bot) degrades from 0.8°C/W to >10°C/W, causing rapid junction temperature rise. At 5 A load, unsoldered PowerPAD can exceed 150°C junction limit within seconds, triggering thermal shutdown. Full thermal performance requires verified solder joint coverage and ≥4 thermal vias.
What is the purpose of the voltage feed-forward feature in the TPS5450DDAG4?
The voltage feed-forward in the TPS5450DDAG4 maintains constant modulator gain across input voltage changes by scaling the PWM ramp inversely with VIN. With a fixed gain of 25, it improves line transient response and simplifies loop compensation-critical for stable regulation when input varies from 5.5 V to 36 V.
TPS5450DDAG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 5.5V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 1.221V
- Voltage - Output (Max):
- 31.32V
- Current - Output:
- 5A
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
TPS5450DDAG4 FAQ
1.How can I place an order for TPS5450DDAG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS5450DDAG4 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 TPS5450DDAG4 reliable?
The price and inventory of TPS5450DDAG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS5450DDAG4 is usually 5 days.
3.What payment methods are accepted for TPS5450DDAG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS5450DDAG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS5450DDAG4?
TPS5450DDAG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS5450DDAG4 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 TPS5450DDAG4?
For technical support, including TPS5450DDAG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS5450DDAG4 requirements.
6.How does Aetrix verify that TPS5450DDAG4 is sourced from the original manufacturer or authorized distributors?
All TPS5450DDAG4 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 TPS5450DDAG4 meets industry standards.
7.What is the process for return or replacement of TPS5450DDAG4?
All TPS5450DDAG4 units undergo pre-shipment inspection (PSI). If there is an issue with TPS5450DDAG4, 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 TPS5450DDAG4 part is unused and in its original packaging.
Return procedure for TPS5450DDAG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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