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Texas Instruments TPS5431DDAG4
- Part No.:
- TPS5431DDAG4
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS5431DDAG4.pdf
- Description:
- IC REG BUCK ADJ 3A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:4,776
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Product details
Overview
TPS5431DDAG4 from Texas Instruments is a 3A synchronous step-down (buck) DC-DC converter with integrated 100mΩ high-side N-channel MOSFET, designed for 5.5V to 23V input rails and adjustable output down to 1.22V. It delivers up to 3A continuous current at 95% peak efficiency, features fixed 500kHz switching frequency, internal compensation, and operates across –40°C to 125°C junction temperature-used in industrial power supplies and LED drivers.
For engineers reviewing the TPS5431DDAG4 datasheet, TPS5431DDAG4 pinout, TPS5431DDAG4 application, or TPS5431DDAG4 equivalent, key selection criteria include its 23V max input rating (vs. TPS5430's 36V), 1.221V ±1.5% reference accuracy, ENA-controlled shutdown (15μA), thermal shutdown at 135°C–162°C, and DDA-package thermal performance (RθJA = 45°C/W).
Technical Context
The TPS5431DDAG4 implements voltage-mode PWM control with input voltage feed-forward to maintain constant power-stage gain and improve line regulation and transient response. Its internal 1.221V bandgap reference is trimmed for ±1.5% initial accuracy and stable over –40°C to 125°C.
It integrates cycle-by-cycle overcurrent protection (4.0–6.0A peak limit), hiccup-mode fault recovery, overvoltage protection (112.5% × VREF trip), undervoltage lockout (5.3V rising threshold, 0.35V hysteresis), and an internal slow-start circuit (8ms typical ramp time) to limit inrush current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5.5V to 23V - defines maximum compatible rail voltage; lower than TPS5430's 36V, enabling tighter layout margins in 24V systems. |
| Output Current | 3A continuous / 4A peak - supports mid-power loads like LCD bias supplies or car audio amplifiers without external current boosting. |
| Switching Frequency | Fixed 500kHz - enables compact LC filter design; no external timing components required. |
| Feedback Reference | 1.221V ±1.5% - sets minimum output voltage; used with external resistor divider to configure precise output levels. |
| High-Side RDS(on) | 100mΩ typical at 12V - contributes to ≥95% peak efficiency; reduces conduction loss and thermal load in 3A applications. |
| Shutdown Current | 15μA typical - enables ultra-low-power standby in battery-backed or energy-sensitive systems. |
| Thermal Shutdown | 135°C–162°C trip range - protects against sustained overload; 14°C hysteresis ensures reliable restart after cooling. |
Pinout & Package
The TPS5431DDAG4 is housed in an 8-pin HSOIC PowerPAD™ (DDA) package with exposed thermal pad (DAP) requiring PCB solder connection for optimal thermal performance (RθJB = 15°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOT | Bootstrap capacitor node | Connects 0.01μF X7R/X5R ceramic capacitor to PH; supplies gate drive voltage for integrated high-side MOSFET. |
| NC (2,3) | No-connect terminals | Internally unconnected; must remain floating-no routing or grounding permitted. |
| VSENSE | Feedback input | Monitors output via resistor divider; regulates output by comparing to 1.221V internal reference. |
| ENA | Enable control input | Active-high logic: >1.3V enables operation; <0.5V disables switching and reduces IQ to 15μA; internal 1.5MΩ pullup allows floating use. |
| GND | Power and signal ground | Reference for all analog circuits; must be connected to exposed DAP for thermal and electrical integrity. |
| VIN | Main input supply | Accepts 5.5V–23V; requires local 10μF ceramic bypass within 1mm of pin and GND. |
| PH | Power switch node | Drives external inductor; connects to source of internal high-side MOSFET and cathode of bootstrap diode. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high-side MOSFET | 100mΩ RDS(on) enables self-contained 3A buck conversion without external switches or drivers. |
| Internal compensation | Eliminates need for external Type III network-reduces BOM count and layout sensitivity while maintaining stability. |
| Voltage feed-forward | Gain = 25 improves line transient response and simplifies loop compensation across wide VIN range. |
| Overvoltage protection | 112.5% × VREF threshold clamps output during fault recovery, preventing downstream component stress. |
| Thermal-enhanced DDA package | PowerPAD™ exposes die attach pad for direct PCB copper connection-lowers junction-to-board thermal resistance to 6°C/W. |
Applications
| Industrial Power Supply | Automotive Audio System |
|---|---|
Use Scenario: 24V truck battery powers Class D amplifier requiring stable 12V rail with low noise and high transient immunity. IC Role / Device Role / Timing Role: Primary buck regulator converting 12–28V input to regulated 12V output; handles load steps up to 3A with minimal overshoot. Use Value: Fixed 500kHz operation avoids AM-band interference; feed-forward and 1.221V reference ensure <±1% output regulation under battery voltage sag. | Use Scenario: Compact infotainment head unit needs isolated 5V/3A rail from vehicle's noisy 12V system. IC Role / Device Role / Timing Role: Point-of-load DC-DC converter with ENA-controlled sequencing; starts only after MCU asserts enable signal. Use Value: 15μA shutdown current extends battery life during sleep mode; thermal shutdown prevents failure during summer cabin temperatures. |
| LED Backlight Driver | Distributed 12V System |
Use Scenario: LCD TV backlight module requires adjustable constant-current source derived from 12V bus. IC Role / Device Role / Timing Role: Constant-voltage stage feeding LED driver IC; output set to 10.5V via resistor divider for current-sense headroom. Use Value: 1.5% reference accuracy ensures consistent LED brightness across units; internal slow-start prevents inrush into large output capacitance. | Use Scenario: Factory automation controller board distributes clean 3.3V/3A from shared 12V backplane. IC Role / Device Role / Timing Role: Local regulator on peripheral card; withstands 12V rail transients per IEC 61000-4-5. Use Value: 23V max input rating provides 10% margin above nominal 12V; overcurrent hiccup mode sustains operation during short-circuit events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS5430DDAG4 | Wider 5.5V–36V input range; higher RDS(on) (125mΩ min at 5.5V); same DDA package and pinout. | Supports 24V/36V industrial rails; less suitable for 12V-only designs where TPS5431's tighter VIN range improves light-load efficiency. | Select when input may exceed 23V or when legacy design reuse is required. |
| LM2678SDX-5.0/NOPB | Fixed 5V output; 5A rating; 260kHz switching; external compensation; no feed-forward or OVP. | Used in cost-sensitive, non-adjustable 5V supplies; lacks precision reference and advanced protection features. | Select only for simple fixed-output needs where 5V is mandatory and 500kHz switching is unnecessary. |
Compared with TPS5430DDAG4, the TPS5431DDAG4 trades input voltage headroom for improved efficiency at 12–23V and tighter thermal specs; versus LM2678SDX-5.0/NOPB, it offers programmability, protection, and higher frequency-making it superior for modern embedded power design.
Availability
TPS5431DDAG4 is available at Aetrix Electronics and suitable for industrial power supplies, automotive audio systems, LED backlight drivers, and distributed 12V systems requiring stable component supply and long-term manufacturability.
Supply support for TPS5431DDAG4 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and consumer markets.
The TPS543x product line delivers highly integrated, thermally robust buck converters targeting space-constrained, high-reliability power applications-from set-top boxes to automotive infotainment and factory automation controllers.
FAQ
What is the maximum input voltage rating for TPS5431DDAG4?
The TPS5431DDAG4 has a maximum input voltage rating of 23V, verified in Section 5.1 Absolute Maximum Ratings and Section 5.3 Recommended Operating Conditions of the official datasheet. This is distinct from the TPS5430DDAG4 (36V max). Exceeding 23V risks permanent damage, as absolute maximum VIN is specified at 25V with no functional guarantee above 23V.
Does TPS5431DDAG4 require external compensation components?
No, the TPS5431DDAG4 uses internal Type III compensation optimized for voltage-mode control, eliminating external capacitors and resistors in the feedback loop. This is confirmed in Section 6.3.6 and Feature list: "Internal compensation minimizes external parts count." Designers retain full stability across 5.5V–23V input and 1.22V–23V output ranges without tuning.
How does the ENA pin function on TPS5431DDAG4?
The ENA pin on TPS5431DDAG4 is an active-high enable input with 1.3V rising threshold and 0.5V falling threshold (325mV hysteresis). When pulled above 1.3V or left floating (due to internal 1.5MΩ pullup), the device operates normally. Below 0.5V, it enters shutdown with 15μA quiescent current. Section 4 Pin Functions and Section 6.3.3 confirm this behavior.
What thermal pad (DAP) connection is required for TPS5431DDAG4?
The exposed thermal pad (DAP) on the TPS5431DDAG4 must be soldered directly to a large PCB copper area tied to GND. Section 5.4 Thermal Information specifies RθJB = 15°C/W only when DAP is properly connected; omitting this connection degrades thermal performance and risks thermal shutdown under 3A load.
Is TPS5431DDAG4 pin-compatible with TPS5430DDAG4?
Yes, TPS5431DDAG4 is pin-compatible with TPS5430DDAG4 in the DDA package: identical 8-pin HSOIC layout, matching BOOT/PH/VIN/GND/VSENSE/ENA/NC pin functions and locations. However, their input voltage ratings differ (23V vs. 36V), so system-level validation is required before substitution in existing designs.
TPS5431DDAG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 5.5V
- Voltage - Input (Max):
- 23V
- Voltage - Output (Min/Fixed):
- 1.221V
- Voltage - Output (Max):
- 20.47V
- Current - Output:
- 3A
- 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
TPS5431DDAG4 FAQ
1.How can I place an order for TPS5431DDAG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS5431DDAG4 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 TPS5431DDAG4 reliable?
The price and inventory of TPS5431DDAG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS5431DDAG4 is usually 5 days.
3.What payment methods are accepted for TPS5431DDAG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS5431DDAG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS5431DDAG4?
TPS5431DDAG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS5431DDAG4 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 TPS5431DDAG4?
For technical support, including TPS5431DDAG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS5431DDAG4 requirements.
6.How does Aetrix verify that TPS5431DDAG4 is sourced from the original manufacturer or authorized distributors?
All TPS5431DDAG4 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 TPS5431DDAG4 meets industry standards.
7.What is the process for return or replacement of TPS5431DDAG4?
All TPS5431DDAG4 units undergo pre-shipment inspection (PSI). If there is an issue with TPS5431DDAG4, 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 TPS5431DDAG4 part is unused and in its original packaging.
Return procedure for TPS5431DDAG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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