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Texas Instruments TPS5420DRG4
- Part No.:
- TPS5420DRG4
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS5420DRG4.pdf
- Description:
- IC REG BUCK ADJ 2A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,557
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Product details
Overview
TPS5420DRG4 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 internal compensation. It delivers tightly regulated output down to 1.22V (±1.5% initial accuracy) and supports industrial power rails in 12V/24V distributed systems.
For engineers reviewing the TPS5420DRG4 datasheet, TPS5420DRG4 pinout, TPS5420DRG4 application, or TPS5420DRG4 equivalent, key selection criteria include input UVLO threshold (5.3V), ENA enable logic (1.3V rise / 0.5V fall), thermal shutdown trip (135°C), hiccup-mode overcurrent protection, and SOIC-8 package compatibility with standard PCB footprints.
Technical Context
The TPS5420DRG4 implements voltage-mode PWM control with integrated voltage feed-forward to maintain constant power-stage gain across input voltage variations-improving line regulation and transient response. Its internal 1.221V reference is trimmed for ±1.5% accuracy over –40°C to 125°C junction temperature.
It uses a bootstrap gate-drive architecture requiring a 0.01μF ceramic capacitor between BOOT and PH pins, integrates slow-start (8ms typical), undervoltage lockout (5.3V rising, 0.35V hysteresis), and cycle-by-cycle overcurrent limiting with hiccup recovery (16ms typical hiccup time).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5.5V to 36V - supports direct connection to unregulated 12V/24V industrial or automotive supplies without pre-regulation. |
| Output Current | 2A continuous, 3A peak - sufficient for powering FPGA I/O banks, LED drivers, or microcontroller subsystems. |
| Switching Frequency | Fixed 500kHz - enables compact LC filter design with standard 33μH inductors and low-ESR ceramic output capacitors. |
| Feedback Reference | 1.221V ±1.5% - sets minimum output voltage; external resistor divider determines final VOUT with precision tracking. |
| High-Side RDS(on) | 110mΩ typical at 12V VIN - contributes to ≥95% peak efficiency and limits conduction loss at full load. |
| Thermal Shutdown | 135°C trip, 14°C hysteresis - protects against sustained overload or poor heatsinking in enclosed enclosures. |
| Enable Threshold | 1.3V rise / 0.5V fall - allows clean ON/OFF control using open-drain logic or microcontroller GPIO without external pull-up. |
Pinout & Package
TPS5420DRG4 is housed in an industry-standard 8-pin SOIC (D package), 4.9mm × 6mm body size with Gull-wing leads. The package supports standard reflow profiles and is compatible with automated optical inspection (AOI) and ICT test fixtures.
| 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 | Internally unconnected; must remain floating-no routing or soldering required. |
| VSENSE | Feedback input | Monitors output voltage via external resistor divider; regulates VOUT by comparing to 1.221V internal reference. |
| ENA | Enable control | Active-high logic input; internal 1.5MΩ pullup allows floating operation; disables switching and reduces IQ to 18μA when <0.5V. |
| GND | Power ground | Primary return path for input bypass, output filter, and internal regulator circuits; requires low-inductance layout to PH/VIN nodes. |
| VIN | Main input supply | Accepts 5.5V–36V; requires local 4.7μF ceramic bypass within 1mm of pin to minimize switching noise injection. |
| PH | Power switch node | Drives external inductor and catch diode; carries high di/dt current; must be routed with minimal loop area to reduce EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high-side MOSFET | 110mΩ RDS(on) eliminates external switch, reduces BOM count, and improves thermal coupling for consistent current limiting. |
| Internal compensation | Eliminates external compensation network-reduces design iteration time and ensures stable operation with standard 33μH/100μF output filters. |
| Voltage feed-forward | Maintains constant modulator gain across input range, enabling predictable transient response and simplified stability analysis without loop tuning. |
| Hiccup-mode overcurrent protection | Enters 16ms off-time recovery during sustained overload-prevents thermal runaway while allowing automatic restart after fault clearance. |
| Thermal shutdown with hysteresis | Shuts down at 135°C and resumes only after cooling to 121°C-avoids oscillatory behavior near thermal limit in marginally cooled designs. |
Applications
| Industrial Power Rails | LED Driver Supply |
|---|---|
Use Scenario: Providing regulated 5V/2A power to PLC I/O modules operating from 24V factory bus. IC Role / Device Role / Timing Role: Primary buck regulator converting unregulated 24V to isolated 5V logic rail with tight line/load regulation. Use Value: Internal UVLO (5.3V) prevents brownout operation during bus dips; 125°C max junction rating ensures reliability in hot control cabinets. | Use Scenario: Driving high-brightness white LEDs in commercial signage with constant-current driver stage powered by 12V input. IC Role / Device Role / Timing Role: Pre-regulator supplying stable 5V to LED driver IC, reducing thermal stress on downstream current source. Use Value: Fixed 500kHz switching minimizes audible noise; 95% peak efficiency lowers heat dissipation in sealed light housings. |
| Set-Top Box Power | Battery Charger Auxiliary Rail |
Use Scenario: Generating 3.3V/2A for SoC core logic and memory in consumer set-top boxes fed from 12V wall adapter. IC Role / Device Role / Timing Role: High-density point-of-load converter placed adjacent to processor BGA for low-noise, low-impedance supply. Use Value: SOIC-8 footprint enables compact layout; internal slow-start (8ms) prevents inrush-induced voltage droop on shared 12V input. | Use Scenario: Supplying 5V/2A auxiliary power to charging controller and display in multi-cell Li-ion battery chargers with 18–28V input range. IC Role / Device Role / Timing Role: Input-stage buck converter stepping down variable battery pack voltage to fixed system rail before linear post-regulation. Use Value: Wide 5.5–36V input accommodates full battery voltage swing; OVP (112.5% × VREF) clamps output during sudden load removal. |
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), 260kHz switching, TO-220 package | Higher current, lower frequency, larger thermal footprint; no adjustable output or ENA pin | Choose for fixed 5V, higher current, and through-hole assembly where board space is less constrained. |
| TPS5430DR | 3A rating, same SOIC-8 package, identical pinout, 100mΩ RDS(on), 500kHz, wider 3–36V input | Higher output current, lower RDS(on), extended low-end input capability; shares layout and feedback network | Choose when 3A output is required and existing TPS5420DRG4 layout can be reused with minor component updates. |
Compared with LM2678-5.0/NOPB, TPS5420DRG4 offers adjustable output, smaller SOIC-8 footprint, and enable control-but lower current. Compared with TPS5430DR, it trades 1A output capacity for lower cost and identical pin compatibility, making it optimal for 2A-constrained designs where thermal headroom is limited.
Availability
TPS5420DRG4 is available at Aetrix Electronics and suitable for industrial automation, LED lighting, and consumer electronics requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for TPS5420DRG4 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 TPS5420DRG4 belongs to TI's SWIFT™ family of integrated DC/DC converters, designed specifically for high-efficiency, low-component-count point-of-load regulation in space-constrained industrial and consumer systems.
FAQ
What is the minimum input voltage required for TPS5420DRG4 to start switching?
The TPS5420DRG4 incorporates an undervoltage lockout (UVLO) circuit with a typical rising threshold of 5.3V and 0.35V hysteresis. It will not initiate switching until VIN exceeds this threshold. Below 5.3V, the device remains disabled regardless of ENA state. This ensures reliable startup from nominal 12V or 24V rails even under transient sags.
Can TPS5420DRG4 operate with an input voltage of 36V continuously?
Yes, TPS5420DRG4 is rated for continuous operation up to 36V input per its Recommended Operating Conditions. Its Absolute Maximum Rating for VIN is 40V, providing 4V margin for transient spikes. However, thermal performance must be verified at 36V/2A-junction temperature should remain below 125°C with appropriate PCB copper area and airflow.
Does TPS5420DRG4 require an external bootstrap diode?
No, TPS5420DRG4 integrates the bootstrap recharge diode internally. Only a 0.01μF low-ESR ceramic capacitor (X7R or X5R dielectric) is required between BOOT and PH pins. Adding an external diode is unnecessary and may interfere with proper gate drive timing.
What is the purpose of the NC pins (pins 2 and 3) on TPS5420DRG4?
Pins 2 and 3 of TPS5420DRG4 are no-connect (NC) terminals-internally unconnected and electrically isolated. They must remain unconnected on the PCB: no traces, vias, or solder paste should be applied. Leaving them floating avoids parasitic coupling and ensures compliance with TI's validated layout guidelines.
How does the overvoltage protection (OVP) function in TPS5420DRG4?
TPS5420DRG4 monitors VSENSE voltage via an internal comparator referenced to 112.5% × 1.221V = ~1.374V. If VSENSE exceeds this threshold-e.g., due to sudden load removal-the high-side MOSFET is immediately turned off. Output regulation resumes only after VSENSE falls below the threshold, preventing damaging voltage overshoot on sensitive downstream loads.
TPS5420DRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
TPS5420DRG4 FAQ
1.How can I place an order for TPS5420DRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS5420DRG4 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 TPS5420DRG4 reliable?
The price and inventory of TPS5420DRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS5420DRG4 is usually 5 days.
3.What payment methods are accepted for TPS5420DRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS5420DRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS5420DRG4?
TPS5420DRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS5420DRG4 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 TPS5420DRG4?
For technical support, including TPS5420DRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS5420DRG4 requirements.
6.How does Aetrix verify that TPS5420DRG4 is sourced from the original manufacturer or authorized distributors?
All TPS5420DRG4 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 TPS5420DRG4 meets industry standards.
7.What is the process for return or replacement of TPS5420DRG4?
All TPS5420DRG4 units undergo pre-shipment inspection (PSI). If there is an issue with TPS5420DRG4, 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 TPS5420DRG4 part is unused and in its original packaging.
Return procedure for TPS5420DRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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