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Texas Instruments TPS5420DR
- Part No.:
- TPS5420DR
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS5420DR.pdf
- Description:
- IC REG BUCK ADJ 2A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,299
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Product details
Overview
TPS5420DR 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). It delivers regulated power in 12V/24V distributed systems, LED drivers, and industrial audio supplies.
For engineers reviewing the TPS5420DR datasheet, TPS5420DR pinout, TPS5420DR application, or TPS5420DR equivalent, this page provides verified pin functions, thermal and electrical specifications, real-world application contexts, and validated alternative parts for supply continuity and design flexibility.
Technical Context
The TPS5420DR implements voltage-mode PWM control with input voltage feed-forward to maintain constant power-stage gain across input variations-improving line regulation and transient response. Its internal compensation network eliminates external compensation components while supporting stable operation with standard output filter configurations.
It integrates undervoltage lockout (UVLO rising threshold 5.3V, hysteresis 330mV), cycle-by-cycle overcurrent protection (3–5A peak limit), overvoltage protection (112.5% × VREF trip), and thermal shutdown (135–162°C trip, 14°C hysteresis). The ENA pin enables active-high control with internal 1.5MΩ pullup and 18μA shutdown current.
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 - sufficient for powering FPGAs, DSPs, or multi-LED strings in compact designs. |
| Switching Frequency | Fixed 500kHz - enables use of small 33μH inductors and reduces output filter size versus lower-frequency alternatives. |
| Feedback Reference | 1.221V ±1.5% at 25°C - sets precise output voltage via external resistor divider; stable over –40°C to 125°C junction range. |
| High-Side RDS(on) | 100–230mΩ - contributes to ≥95% peak efficiency and low thermal dissipation at full load. |
| Thermal Resistance | RθJA = 75°C/W (custom board) - defines maximum ambient temperature before thermal shutdown under 2A load. |
| Shutdown Current | 18μA typical - enables ultra-low-power standby in battery-backed or energy-sensitive systems. |
Pinout & Package
TPS5420DR is housed in an 8-pin SOIC package (4.9mm × 6mm), optimized for thermal performance and PCB layout simplicity in medium-power buck applications.
| 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 soldering required. |
| VSENSE | Feedback input | Monitors output voltage divider midpoint; regulates output by comparing to 1.221V reference. |
| ENA | Enable control | Active-high logic input (1.3V turn-on, 0.5V turn-off); internal 1.5MΩ pullup allows floating operation. |
| GND | Power ground | Primary return path for VIN, PH, and internal circuits; requires low-impedance connection to PCB ground plane. |
| VIN | Main input supply | Accepts 5.5–36V; requires local 4.7μF ceramic bypass within 1mm of pin to minimize high-frequency noise. |
| 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 | 110mΩ RDS(on) enables self-contained 2A buck conversion without external power switches or drivers. |
| Internal compensation | Eliminates need for external Type III compensation network-reduces BOM count and layout sensitivity. |
| Voltage feed-forward | Maintains constant modulator gain across input voltage changes, improving line transient response by >30% vs non-feed-forward designs. |
| Slow-start circuit | 8ms typical ramp time prevents inrush current and output overshoot during power-up without external timing components. |
| Comprehensive protection | Includes UVLO, hiccup-mode overcurrent, OVP (112.5% × VREF), and thermal shutdown-enables robust operation in unattended systems. |
Applications
| Industrial Power Supply | Automotive Audio System |
|---|---|
|
Use Scenario: Regulating 24V vehicle battery rail to 5V/2A for digital signal processors and amplifiers in premium car audio head units. IC Role / Device Role / Timing Role: Primary step-down regulator providing clean, stable 5V supply with fast transient response to handle dynamic audio load steps. Use Value: Integrated MOSFET and feed-forward control reduce output voltage deviation to <50mV during 1A load steps-preserving audio fidelity. |
Use Scenario: Converting 12V battery input to 3.3V for microcontrollers and sensors in dashboard infotainment modules. IC Role / Device Role / Timing Role: Compact, thermally efficient buck converter operating across automotive temperature range (–40°C to 125°C). Use Value: 75°C/W RθJA and thermal shutdown ensure reliable operation without heatsinks-even in sealed enclosures. |
| LED Lighting Driver | Distributed Power System |
|
Use Scenario: Driving high-brightness white LED strings in commercial signage requiring constant-current regulation via external sense resistor. IC Role / Device Role / Timing Role: Constant-voltage source feeding CC driver IC; configured for 12V output with tight 1.5% reference accuracy. Use Value: Adjustable 1.22V feedback reference enables precise output setting-critical for consistent LED color point and lumen output. |
Use Scenario: Point-of-load conversion in 24V industrial PLC backplanes delivering 5V/2A to I/O modules and communication interfaces. IC Role / Device Role / Timing Role: Isolated secondary-side regulator minimizing EMI coupling into sensitive analog and serial bus circuits. Use Value: Fixed 500kHz frequency simplifies EMI filtering and allows smaller magnetics-reducing board area by ~35% vs 100kHz solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2678-5.0/NOPB | Fixed 5V output, 5A rating, 63mΩ RDS(on), no ENA pin, 260kHz switching | Higher current, lower efficiency at light loads, larger inductor required due to lower frequency | Choose when fixed 5V output and higher peak current are prioritized over adjustability and compact size. |
| TPS5430DR | 3A rating, same 5.5–36V input, identical pinout and compensation, 105mΩ RDS(on) | Direct upgrade path for higher output current; shares layout and feedback network with TPS5420DR | Choose when future-proofing for 3A loads or margin expansion is needed-no PCB change required. |
Compared with LM2678-5.0/NOPB, TPS5420DR offers adjustable output and superior light-load efficiency; compared with TPS5430DR, it trades 1A output capacity for lower cost and thermal footprint in 2A-constrained designs.
Availability
TPS5420DR is available at Aetrix Electronics and suitable for industrial power supplies, automotive audio systems, LED lighting drivers, and 12V/24V distributed power systems requiring stable component supply and long-term manufacturability.
Supply support for TPS5420DR 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 TPS5420DR belongs to TI's SWIFT™ family of integrated DC/DC converters-designed specifically for space-constrained, medium-power applications demanding high efficiency, robust protection, and minimal external components.
FAQ
What is the minimum input voltage required for TPS5420DR to start switching?
The TPS5420DR features an undervoltage lockout (UVLO) circuit with a typical rising threshold of 5.3V and hysteresis of 330mV. It will not initiate switching until the VIN pin voltage exceeds 5.3V. Below this level, internal circuits remain inactive and the slow-start sequence is held in reset. This ensures reliable startup from nominal 12V or 24V rails even under brownout conditions.
Can TPS5420DR be used with an output voltage lower than 5V?
Yes, the TPS5420DR supports adjustable output voltages down to 1.22V using an external resistor divider on the VSENSE pin. Its 1.221V ±1.5% internal reference enables precise regulation-for example, configuring 3.3V output with 0.5% tolerance using 1% resistors. The device maintains stability and transient performance across the full adjustment range.
Does TPS5420DR require external compensation components?
No, the TPS5420DR includes fully internal Type III compensation optimized for voltage-mode control. This eliminates external capacitors and resistors typically needed for loop stability, reducing BOM count and layout complexity. Designers only need to select appropriate output inductor and capacitor values per the datasheet guidelines.
What thermal protection mechanisms does TPS5420DR include?
The TPS5420DR incorporates thermal shutdown with a trip threshold between 135°C and 162°C and 14°C hysteresis. When junction temperature exceeds the threshold, the voltage reference is grounded and the high-side MOSFET is turned off. Restart occurs automatically after temperature falls below the hysteresis limit, ensuring safe recovery without manual intervention.
Is the ENA pin of TPS5420DR compatible with standard logic-level signals?
Yes-the ENA pin accepts active-high logic control with a 1.3V turn-on threshold and 0.5V turn-off threshold. It features an internal 1.5MΩ pullup resistor, allowing direct connection to open-drain or microcontroller GPIO outputs. Driving ENA below 0.5V disables the device and reduces quiescent current to 18μA, making it ideal for low-power sequencing.
TPS5420DR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (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):
- 1.22V
- 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
TPS5420DR FAQ
1.How can I place an order for TPS5420DR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS5420DR 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 TPS5420DR reliable?
The price and inventory of TPS5420DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS5420DR is usually 5 days.
3.What payment methods are accepted for TPS5420DR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS5420DR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS5420DR?
TPS5420DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS5420DR 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 TPS5420DR?
For technical support, including TPS5420DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS5420DR requirements.
6.How does Aetrix verify that TPS5420DR is sourced from the original manufacturer or authorized distributors?
All TPS5420DR 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 TPS5420DR meets industry standards.
7.What is the process for return or replacement of TPS5420DR?
All TPS5420DR units undergo pre-shipment inspection (PSI). If there is an issue with TPS5420DR, 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 TPS5420DR part is unused and in its original packaging.
Return procedure for TPS5420DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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