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Texas Instruments TPS5420DG4
- Part No.:
- TPS5420DG4
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS5420DG4.pdf
- Description:
- IC REG BUCK ADJ 2A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,856
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Product details
Overview
TPS5420DG4 from Texas Instruments is a 2A, wide-input (5.5V–36V), synchronous step-down DC/DC converter with integrated 110mΩ high-side N-channel MOSFET, fixed 500kHz switching frequency, and adjustable output down to 1.22V (±1.5% initial accuracy), used in 12V/24V distributed power systems and LED drivers.
For engineers reviewing the TPS5420DG4 datasheet, TPS5420DG4 pinout, TPS5420DG4 application, or TPS5420DG4 equivalent, key selection criteria include input voltage range, peak current limit (3A), thermal shutdown threshold (135°C), internal compensation, and SOIC-8 package compatibility with layout-sensitive BOOT/PH routing.
Technical Context
The TPS5420DG4 implements voltage-mode PWM control with integrated voltage feed-forward to maintain constant power-stage gain across input variations-improving line regulation and transient response. Its internal slow-start (8ms typical) and undervoltage lockout (5.5V rising threshold) ensure controlled startup under varying input conditions.
It features cycle-by-cycle overcurrent protection with hiccup-mode recovery, overvoltage protection triggered at 112.5% × VREF, and thermal shutdown with 14°C hysteresis. The device uses an internal 1.5MΩ pullup on ENA, enabling operation with floating enable while supporting active-high logic control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5.5V to 36V - supports direct connection to 12V/24V industrial and automotive rails without pre-regulation. |
| Output Current | 2A continuous / 3A peak - enables single-chip supply for mid-power loads like LCD bias, LED strings, or SoC core rails. |
| Switching Frequency | Fixed 500kHz - allows compact LC filter design with standard 33μH inductors and reduces audible noise vs lower-frequency converters. |
| Feedback Reference | 1.221V ±1.5% - sets minimum output voltage; enables precise 3.3V/5V generation using standard resistor dividers. |
| High-Side RDS(on) | 100–230mΩ - determines conduction loss at full load; efficiency peaks at 95% with optimized layout and ceramic output caps. |
| Thermal Shutdown | 135°C trip / 14°C hysteresis - protects against sustained overload or poor heatsinking; automatic recovery after cooldown. |
| Enable Threshold | 1.3V rise / 0.5V fall - provides clean ON/OFF control; internal 1.5MΩ pullup allows direct MCU GPIO interface without external bias. |
Pinout & Package
TPS5420DG4 is housed in an 8-pin SOIC package (4.9mm × 6mm), optimized for thermal performance on standard PCBs with exposed pad grounding not required. Pin functions are validated per TI SLVS642G Rev. April 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOT | Bootstrap capacitor node | Connects 0.01μF X7R/X5R ceramic between BOOT and PH to generate gate drive for integrated high-side MOSFET. |
| NC (2,3) | No-connect terminals | Internally unconnected; must remain unpopulated or left floating-no routing or copper fill allowed. |
| VSENSE | Feedback input | Monitors output divider midpoint; regulates output by comparing to 1.221V reference-accuracy defines system voltage tolerance. |
| ENA | Enable control | Active-high logic input; >1.3V enables regulation, <0.5V disables with 18μA shutdown current-supports power sequencing. |
| GND | Power ground | Primary return path for VIN, PH, and internal circuits; requires low-inductance connection to minimize switching noise. |
| VIN | Main input supply | Accepts 5.5–36V; bypassed with ≥10μF ceramic cap placed within 1mm of pin to suppress high-frequency ripple. |
| PH | Power switch node | Drives external inductor; carries high di/dt square wave-requires tight loop area with GND and VIN caps to reduce EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high-side MOSFET | 110mΩ typical RDS(on) eliminates external switch, reducing BOM count and layout complexity for 2A designs. |
| Internal compensation | Eliminates external compensation network-enables stable operation with standard output LC filters without tuning. |
| Voltage feed-forward | Maintains constant modulator gain across input range, improving line transient response and simplifying stability analysis. |
| Overvoltage protection (OVP) | Shuts off high-side FET when VSENSE exceeds 112.5% × VREF-prevents output overshoot during load dump or startup faults. |
| Thermal shutdown with hysteresis | Disables regulator at 135°C junction temp and re-enables only after cooling to 121°C-prevents thermal cycling damage. |
Applications
| Consumer Electronics Power | Industrial Distributed Supply |
|---|---|
Use Scenario: Powering LCD display backlight and digital logic in set-top boxes and DVD players from 12V wall adapters. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 3.3V/5V outputs with fast transient response to video processing load steps. Use Value: Internal compensation and 500kHz switching enable compact, low-noise design meeting consumer EMI limits without added filtering. | Use Scenario: Generating local 5V rails in programmable logic controllers (PLCs) powered from 24V industrial bus. IC Role / Device Role / Timing Role: Point-of-load converter providing isolated, stable 5V for microcontrollers and I/O buffers in harsh environments. Use Value: Wide 5.5–36V input range accommodates 24V nominal with ±20% tolerance and brownout resilience. |
| Battery Charger Auxiliary Rail | High-Power LED Driver |
Use Scenario: Supplying 3.3V control circuitry and communication interfaces in multi-cell lithium-ion battery chargers. IC Role / Device Role / Timing Role: Secondary regulator deriving low-noise bias from main charger's high-voltage DC bus (e.g., 18–30V). Use Value: UVLO (5.5V) and thermal shutdown ensure safe operation during battery insertion/removal and charger fault conditions. | Use Scenario: Driving constant-current LED arrays in architectural lighting fixtures powered from 12V/24V vehicle or building supplies. IC Role / Device Role / Timing Role: Constant-voltage front-end supplying current-source LED driver ICs with tightly regulated input. Use Value: 2A output and 95% peak efficiency minimize heat buildup in enclosed luminaires, extending thermal lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54202DDCR | 3A continuous output, 2.5V–6V input range, 1.2V feedback reference, SOT-23-6 package | Targeted at low-input, high-density portable designs-not suitable for 12V/24V industrial inputs | Select TPS5420DG4 for wide-input (>5.5V), higher-current, SOIC-mount applications requiring proven thermal robustness. |
| LM2678SD-5.0/NOPB | 5V fixed output, 8–40V input, 5A output, TO-263-7 package, external compensation required | Higher current but larger footprint and design complexity; no OVP or feed-forward | Choose TPS5420DG4 when board space, internal compensation, and OVP are prioritized over raw current capacity. |
Compared with TPS5420DG4, TPS54202DDCR offers higher current in a smaller package but sacrifices input voltage range and thermal margin, while LM2678SD-5.0/NOPB delivers greater output current at the cost of external compensation, larger size, and reduced protection features.
Availability
TPS5420DG4 is available at Aetrix Electronics and suitable for consumer electronics power, industrial distributed supply, battery charger auxiliary rail, and high-power LED driver applications requiring stable component supply across extended product lifecycles.
Supply support for TPS5420DG4 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 TPS5420DG4 belongs to TI's SWIFT™ family of integrated DC/DC converters, designed specifically for high-efficiency, low-component-count point-of-load regulation in industrial, automotive, and consumer systems.
FAQ
What is the maximum input voltage rating for the TPS5420DG4?
The TPS5420DG4 has an absolute maximum input voltage rating of 40V, but its recommended operating input voltage range is 5.5V to 36V. Operation above 36V may trigger overvoltage stress on internal circuitry and is not guaranteed for reliability or lifetime. The device incorporates undervoltage lockout (UVLO) that prevents startup below 5.5V, ensuring safe operation across its specified range. Always observe derating guidelines in TI's SLVS642G datasheet for long-term stability.
Does the TPS5420DG4 require external compensation components?
No, the TPS5420DG4 does not require external compensation components. It features fully internal type-3 compensation optimized for voltage-mode control, enabling stable operation with standard output LC filters (e.g., 33μH inductor + 100μF output capacitor). This eliminates the need for external resistors and capacitors in the feedback loop, reducing BOM count and layout sensitivity-critical for rapid prototyping and space-constrained designs.
How does the ENA pin function on the TPS5420DG4?
The ENA pin on the TPS5420DG4 is an active-high enable input with a 1.3V rising threshold and 0.5V falling threshold. It includes an internal 1.5MΩ pullup resistor, allowing the device to operate when left floating. Pulling ENA below 0.5V disables switching and reduces quiescent current to 18μA. Connecting ENA directly to ground is prohibited-use open-drain logic or a series resistor to avoid violating the ENA-to-GND absolute maximum rating of –0.3V.
What is the purpose of the BOOT and PH pins on the TPS5420DG4?
The BOOT and PH pins on the TPS5420DG4 form the bootstrap gate-drive circuit for the integrated high-side N-channel MOSFET. A 0.01μF low-ESR ceramic capacitor must be placed between BOOT and PH to generate the required gate-source voltage above VIN. PH is the switch-node output connecting to the inductor and freewheeling diode; improper routing here causes EMI and efficiency loss. TI specifies X7R/X5R dielectrics for the bootstrap cap due to stable capacitance over temperature and bias.
Can the TPS5420DG4 safely drive a 2A continuous load at 36V input?
Yes, the TPS5420DG4 is rated for 2A continuous output current across its full 5.5V–36V input range, provided thermal design meets specifications. At 36V input and 5V output, power dissipation increases due to higher duty-cycle losses; TI's datasheet confirms 75°C/W junction-to-ambient thermal resistance on a custom board. Adequate copper pour, airflow, or heatsinking is required to maintain TJ ≤ 125°C. Efficiency drops to ~88% under these conditions, per typical characteristics curves in SLVS642G.
TPS5420DG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (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):
- 36V
- Voltage - Output (Min/Fixed):
- 1.22V
- Voltage - Output (Max):
- 31V
- Current - Output:
- 2A
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
TPS5420DG4 FAQ
1.How can I place an order for TPS5420DG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS5420DG4 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 TPS5420DG4 reliable?
The price and inventory of TPS5420DG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS5420DG4 is usually 5 days.
3.What payment methods are accepted for TPS5420DG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS5420DG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS5420DG4?
TPS5420DG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS5420DG4 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 TPS5420DG4?
For technical support, including TPS5420DG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS5420DG4 requirements.
6.How does Aetrix verify that TPS5420DG4 is sourced from the original manufacturer or authorized distributors?
All TPS5420DG4 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 TPS5420DG4 meets industry standards.
7.What is the process for return or replacement of TPS5420DG4?
All TPS5420DG4 units undergo pre-shipment inspection (PSI). If there is an issue with TPS5420DG4, 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 TPS5420DG4 part is unused and in its original packaging.
Return procedure for TPS5420DG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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