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Texas Instruments TPS5450DDARG4
- Part No.:
- TPS5450DDARG4
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS5450DDARG4.pdf
- Description:
- IC REG BUCK ADJ 5A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:2,214
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Product details
Overview
TPS5450DDARG4 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, adjustable output down to 1.22 V (±1.5% initial accuracy), and internal compensation. It operates from 5.5 V to 36 V input and delivers regulated power in space-constrained industrial and display power supplies.
For engineers reviewing the TPS5450DDARG4 datasheet, TPS5450DDARG4 pinout, TPS5450DDARG4 application, or TPS5450DDARG4 equivalent, key selection criteria include input voltage range, continuous output current capability, thermal performance in SOIC PowerPAD™, shutdown quiescent current, and voltage feed-forward transient response enhancement.
Technical Context
The TPS5450DDARG4 implements constant-frequency voltage-mode control with integrated voltage feed-forward to maintain stable loop gain across input variations-improving line regulation and transient response. Its internal slow-start (8 ms typical), undervoltage lockout (5.5 V start threshold, 330 mV hysteresis), and hiccup-mode overcurrent protection (7.5 A typical limit, 16 ms hiccup time) enable robust system-level fault handling.
It integrates bootstrap recharge diode and gate driver bias circuitry, requiring only a 0.01-μF ceramic capacitor between BOOT and PH pins. The VSENSE feedback node references a trimmed 1.221-V bandgap (±0.5% over temperature), and internal Type-3 compensation eliminates external compensation components for standard output filter designs.
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. |
| Continuous Output Current | 5 A - sustains full load under thermal limits with proper PCB copper and thermal vias on PowerPAD™. |
| Switching Frequency | 500 kHz (±100 kHz) - enables compact LC filter design with reduced inductor size and core loss. |
| Feedback Reference Voltage | 1.221 V ±1.5% (initial), ±0.5% over –40°C to 125°C - sets precise output voltage via external resistor divider. |
| High-Side MOSFET rDS(on) | 110 mΩ (typical at TJ = 25°C) - contributes to >90% peak efficiency at mid-load in 12-V-to-5-V conversion. |
| Shutdown Supply Current | 18 μA (typical) - enables ultra-low-power system standby without external disconnect switches. |
| Thermal Shutdown Threshold | 135°C (trip), 121°C (release hysteresis) - protects against sustained overload or poor heatsinking. |
Pinout & Package
TPS5450DDARG4 uses an 8-pin HSOP (DDA) package with thermally enhanced PowerPAD™ (Pin 9, exposed pad), measuring 4.89 mm × 3.90 mm. The PowerPAD must be soldered to a large PCB copper area with ≥4 thermal vias for reliable 5-A operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOT | Bootstrap supply node | Connects 0.01-μF X7R/X5R ceramic capacitor to PH; supplies gate drive voltage for high-side MOSFET. |
| NC (Pins 2, 3) | No-connect | Internally unconnected; must remain floating or grounded per layout best practice-no routing required. |
| VSENSE | Feedback input | Monitors output voltage divider midpoint; regulates output by comparing to 1.221-V reference. |
| ENA | Enable control input | 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; must be connected to PowerPAD™ for thermal and electrical integrity. |
| VIN | Main input supply | Accepts 5.5–36 V; requires local 4.7-μF ceramic decoupling capacitor placed adjacent to pin. |
| PH | Power switch node | Drives external inductor; connects to BOOT capacitor and catch diode (if used); carries high di/dt switching current. |
Key Features
| Feature | Design Value |
|---|---|
| Voltage feed-forward | Fixed gain of 25 - maintains constant modulator gain vs. VIN, simplifying stability analysis and improving line transient response. |
| Internal compensation | Type-3 network integrated - eliminates external compensation components while ensuring ≥60° phase margin with standard LC filters. |
| Integrated bootstrap diode | On-die recharge path - removes need for external bootstrap diode, reducing BOM count and layout complexity. |
| Hiccup-mode OCP | 16-ms fault timeout + automatic restart - prevents thermal runaway during sustained short-circuit or overload conditions. |
| Thermally enhanced PowerPAD™ | 0.8°C/W junction-to-board resistance - enables 5-A continuous operation with minimal PCB copper area when properly soldered. |
Applications
| High-Density Point-of-Load Regulator | LCD/Plasma Display Power |
|---|---|
Use Scenario: Compact board space near FPGA or ASIC requiring tightly regulated 1.2 V, 1.8 V, or 3.3 V at up to 5 A. IC Role / Device Role / Timing Role: Primary buck regulator delivering stable, low-noise DC output with fast transient response to dynamic load steps. Use Value: Internal compensation and 500-kHz switching allow <10-mm² total solution size; voltage feed-forward ensures <1% output deviation during 2-A/μs load transients. | Use Scenario: Backlight LED driver or panel logic supply in commercial LCD monitors or signage systems. IC Role / Device Role / Timing Role: Main 12-V-to-5-V or 24-V-to-3.3-V conversion stage powering display controller ICs and timing circuits. Use Value: 36-V max input accommodates wide industrial input tolerances; 18-μA shutdown enables remote panel power-off without auxiliary LDOs. |
| Battery Charger Front-End | 12/24-V Distributed Power System |
Use Scenario: Input-stage buck converter in multi-cell Li-ion or lead-acid battery chargers accepting variable wall adapter or vehicle input. IC Role / Device Role / Timing Role: Pre-regulator stepping down unregulated 9–32 V input to fixed 5 V or 12 V for downstream charge management ICs. Use Value: Wide 5.5–36 V input range eliminates need for input voltage clamping; UVLO hysteresis prevents oscillation during brownout recovery. | Use Scenario: Local DC-DC conversion in industrial PLCs, motor drives, or IoT gateways powered from centralized 12-V or 24-V backplanes. IC Role / Device Role / Timing Role: Isolated point-of-load supply generating 3.3 V or 5 V for microcontrollers, sensors, and communication interfaces. Use Value: –40°C to 125°C operating range supports extended temperature environments; thermal shutdown ensures reliability under convection-cooled enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS5430DDAR | 3-A output rating, same 5.5–36 V input, identical pinout and compensation architecture. | Suitable where peak load current ≤3 A; lower thermal stress but insufficient for 5-A continuous loads. | Select TPS5430DDAR only if system peak current remains below 3 A and board layout re-use is prioritized. |
| LM2678SD-5.0/NOPB | 5-A rated but fixed 5-V output, no adjustable feedback, 260-kHz switching, larger SOIC-8 footprint. | Applicable for fixed-output systems; lacks voltage feed-forward and internal compensation flexibility. | Choose LM2678SD-5.0/NOPB only when output voltage is fixed at 5 V and lower switching frequency is acceptable for EMI filtering. |
Compared with TPS5450DDARG4, TPS5430DDAR offers identical integration and layout compatibility but lower current capacity, while LM2678SD-5.0/NOPB trades adjustability and transient performance for fixed-output simplicity-neither is pin-compatible nor drop-in, requiring schematic and layout review for substitution.
Availability
TPS5450DDARG4 is available at Aetrix Electronics and suitable for high-density point-of-load regulators, LCD/plasma display power supplies, and 12-V/24-V distributed power systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for TPS5450DDARG4 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 technologies, with decades of expertise in high-reliability power conversion ICs.
The TPS5450DDARG4 belongs to TI's SWIFT™ family of integrated DC/DC converters, designed specifically for high-current, wide-input industrial and display power applications where small size, thermal robustness, and fast transient response are critical.
FAQ
What is the maximum recommended input voltage for TPS5450DDARG4?
The absolute maximum input voltage for TPS5450DDARG4 is 40 V, but the recommended operating range is 5.5 V to 36 V. Exceeding 36 V risks violating safe operating area limits and may trigger overvoltage protection or damage the integrated MOSFET. For reliable 5-A operation, TI specifies 36 V as the upper limit in all recommended conditions tables and thermal models.
Does TPS5450DDARG4 require an external bootstrap diode?
No, TPS5450DDARG4 does not require an external bootstrap diode. It integrates the bootstrap recharge diode internally, allowing direct connection of a 0.01-μF ceramic capacitor between BOOT and PH pins. This integration reduces component count, improves reliability, and simplifies layout-confirmed in Section 7.3.5 and Figure 7-2 of the official datasheet.
Can TPS5450DDARG4 be used to generate a 1.2 V output?
Yes, TPS5450DDARG4 can generate a 1.2 V output using an external resistor divider on the VSENSE pin. Its internal reference is 1.221 V ±1.5% initial accuracy, so a 1.2 V output is achievable with appropriate R1/R2 values (e.g., R1 = 10 kΩ, R2 ≈ 3.05 kΩ). However, output accuracy will be limited by reference tolerance and resistor matching-TI recommends ≥1.22 V for guaranteed specification compliance.
What thermal management is required for full 5-A operation of TPS5450DDARG4?
For full 5-A continuous operation, TPS5450DDARG4 requires its PowerPAD™ (Pin 9) to be soldered to ≥1 cm² of 2-oz copper with ≥4 thermal vias (10-mil diameter) connecting to inner ground planes. On a standard 4-layer board, this achieves RθJA ≈ 42.3°C/W; with optimized layout, junction temperature stays ≤125°C at TA = 85°C-per Section 6.4 and Figure 10-2 of the datasheet.
Is TPS5450DDARG4 compatible with WEBENCH® Power Designer?
Yes, TPS5450DDARG4 is fully supported in TI's WEBENCH® Power Designer tool. Users can enter input/output specifications, select TPS5450DDARG4, and generate complete schematics, BOMs, efficiency plots, thermal simulations, and PCB layout recommendations-including validated inductor and capacitor selections per Section 8.2.2 of the datasheet.
TPS5450DDARG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- 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):
- 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
TPS5450DDARG4 FAQ
1.How can I place an order for TPS5450DDARG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS5450DDARG4 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 TPS5450DDARG4 reliable?
The price and inventory of TPS5450DDARG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS5450DDARG4 is usually 5 days.
3.What payment methods are accepted for TPS5450DDARG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS5450DDARG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS5450DDARG4?
TPS5450DDARG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS5450DDARG4 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 TPS5450DDARG4?
For technical support, including TPS5450DDARG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS5450DDARG4 requirements.
6.How does Aetrix verify that TPS5450DDARG4 is sourced from the original manufacturer or authorized distributors?
All TPS5450DDARG4 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 TPS5450DDARG4 meets industry standards.
7.What is the process for return or replacement of TPS5450DDARG4?
All TPS5450DDARG4 units undergo pre-shipment inspection (PSI). If there is an issue with TPS5450DDARG4, 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 TPS5450DDARG4 part is unused and in its original packaging.
Return procedure for TPS5450DDARG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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