TPS54331DR - 3A, 28V Step-Down Converter | Texas Instruments
MPN: TPS54331DR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.23 | $1.23 |
| 10 | $1.1 | $11.00 |
| 100 | $0.88 | $88.00 |
| 500 | $0.72 | $360.00 |
| 1,000 | $0.61 | $610.00 |
Drop-in alternatives for TPS54331DR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
TPS54331DDA
✅ Drop-In📋 Reference alternative (not in catalog)
TPS54331QDRQ1
✅ Drop-In📋 Reference alternative (not in catalog)
TPS5430DDAR
✅ Drop-In✓ In Stock
$1.85 / Unit
View Datasheet →TPS5450DDAR
✅ Drop-In✓ In Stock
$2.2 / Unit
View Datasheet →TPS54231D
✅ Drop-In📋 Reference alternative (not in catalog)
TPS54332D
✅ Drop-In📋 Reference alternative (not in catalog)
TPS54331DR Maximum Ratings & Electrical Characteristics
| Function | Step-Down (Buck) Converter |
| Output Type | Adjustable |
| Output Voltage Range | 0.8 V to 25 V |
| Maximum Output Current | 3 A |
| Input Voltage Range | 3.5 V to 28 V |
| Switching Frequency | 570 kHz |
| Synchronous Rectification | No (Non-synchronous) |
| Control Architecture | Current Mode |
| Light Load Efficiency | Eco-mode (pulse skipping) |
| Shutdown Supply Current | 1 µA |
| Operating Temperature Range | -40°C to +125°C (TJ) |
| Package | 8-SOIC (D) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| MSL Level | [DATA_NEEDED: MSL Level] |
TPS54331DR Pin Configuration
| Pin 1 | BOOT — Bootstrap capacitor connection for high-side gate drive |
| Pin 2 | VIN — Input supply voltage |
| Pin 3 | EN — Enable pin (active high) |
| Pin 4 | COMP — Compensation network connection |
| Pin 5 | FB — Feedback voltage sense |
| Pin 6 | GND — Ground |
| Pin 7 | SW — Switch node output |
| Pin 8 | VIN — Input supply voltage (connected to pin 2) |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
TPS54331DR is suitable for 6 applications: Industrial Power Supplies, Consumer Electronics, Set-Top Boxes, LCD Displays, Distributed Power Systems, Battery-Powered Equipment.
Industrial Power Supplies
The TPS54331DR is ideal for industrial power supplies that need to step down 24V or 12V buses to lower voltages for control electronics. Its wide input range (3.5V to 28V) and 3A output capability make it suitable for powering PLCs, sensors, and actuators. The current mode control provides excellent line and load transient response, ensuring stable operation in noisy industrial environments. The Eco-mode feature improves efficiency at light loads, reducing power consumption in standby modes. With a 570kHz switching frequency, external components are small, saving PCB space. The device's thermal shutdown and overcurrent protection enhance reliability in harsh conditions.
Recommended
Consumer Electronics
In consumer electronics like set-top boxes, LCD TVs, and gaming consoles, the TPS54331DR provides efficient power conversion from a 12V or 19V adapter to core voltages (e.g., 5V, 3.3V, 1.8V). Its adjustable output allows precise voltage setting for different ICs. The high switching frequency (570kHz) enables the use of small inductors and capacitors, reducing the overall solution footprint. The Eco-mode feature helps meet energy efficiency standards by reducing power consumption at light loads. The device's low shutdown current (1µA) is beneficial for standby power reduction. Its robust protection features ensure reliable operation in consumer environments.
Recommended
Set-Top Boxes
The TPS54331DR is well-suited for set-top boxes that require multiple voltage rails from a single 12V input. Its 3A output can power the main SoC, while additional rails can be generated with other converters. The adjustable output voltage (0.8V to 25V) provides flexibility for different IC requirements. The current mode control ensures stable operation during dynamic load changes, such as when the processor wakes from sleep. The Eco-mode feature reduces power consumption during standby, helping meet energy star requirements. The small SOIC package is easy to integrate into space-constrained designs.
Recommended
LCD Displays
The TPS54331DR is used in LCD displays to generate the various supply voltages needed for the panel, timing controller, and backlight driver. Its wide input range (3.5V to 28V) allows it to operate from a 12V or 24V backlight supply. The 3A output can power the logic circuits, while the adjustable output voltage can be set to match the required rail. The high switching frequency (570kHz) reduces the size of external components, which is critical in slim display designs. The device's efficiency helps minimize heat generation, improving reliability. The Eco-mode feature is beneficial for power saving in displays with ambient light sensors.
Recommended
Distributed Power Systems
In distributed power systems, the TPS54331DR can be used as a point-of-load (POL) converter to step down an intermediate bus voltage (e.g., 12V or 24V) to local voltages for FPGAs, DSPs, and microcontrollers. Its 3A output is suitable for many digital loads. The current mode control provides fast transient response, which is essential for processors that draw varying currents. The device's wide input range allows it to handle bus voltage variations. The Eco-mode feature improves efficiency at light loads, which is common in systems with multiple power states. The small package and minimal external components make it easy to place near the load, reducing parasitic inductance.
Recommended
Battery-Powered Equipment
The TPS54331DR is suitable for battery-powered equipment that requires efficient step-down conversion from a battery voltage (e.g., 12V or 24V) to lower voltages. Its low shutdown current (1µA) is critical for extending battery life in standby mode. The Eco-mode feature maintains high efficiency at light loads, which is common in portable devices. The wide input range accommodates battery voltage variations during discharge. The device's small package and high switching frequency (570kHz) allow for compact designs. The adjustable output voltage enables precise regulation for sensitive electronics. The thermal shutdown and overcurrent protection ensure safe operation.
Recommended
Recommended Products Summary
Engineering reference data for TPS54331DR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TPS54331DDA | TPS54331QDRQ1 | TPS5430DDAR | TPS5450DDAR |
|---|---|---|---|---|---|
| Package | 8-SOIC (D) | 8-SO PowerPAD (DDA) | 8-SOIC (D) | 8-SO PowerPAD (DDA) | 8-SO PowerPAD (DDA) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Input Voltage Range | 3.5V to 28V | 3.5V to 28V | 3.5V to 28V | 5.5V to 36V | 5.5V to 36V |
| Output Current | 3A | 3A | 3A | 3A | 5A |
| Switching Frequency | 570kHz | 570kHz | 570kHz | 500kHz | 500kHz |
| Synchronous Rectification | No | No | No | No | No |
| Automotive Grade | No | No | Yes (AEC-Q100) | No | No |
| Shutdown Supply Current | 1µA | 1µA | 1µA | 18µA | 18µA |
Key Differentiators
- Wide input voltage range (3.5V to 28V) (vs TPS5430DDAR)
- Ultra-low shutdown current (1µA) (vs TPS5430DDAR)
- Automotive grade option available (vs TPS54331DDA)
Design Notes
For optimal performance, place the input capacitor (10µF) and output capacitor (47µF) as close as possible to the VIN and SW pins. Use a solid ground plane to minimize parasitic inductance. The bootstrap capacitor (0.1µF) should be placed directly between BOOT and SW pins. Keep the feedback trace short and away from the SW node to avoid noise coupling.
The TPS54331DR is a non-synchronous buck converter, so an external Schottky diode is required for the low-side rectification. Choose a diode with a voltage rating at least 1.5 times the maximum input voltage and a current rating equal to the output current. The diode should have low forward voltage drop to minimize losses. Place the diode close to the SW pin and ground.
The TPS54331DR in the SOIC package has limited thermal dissipation capability. For high power dissipation (e.g., 12V to 3.3V at 3A), consider using the DDA package (TPS54331DDA) which has an exposed thermal pad. Ensure adequate copper area on the PCB for heat sinking. The junction temperature should be kept below 125°C for reliable operation.
Compliance Information
RoHS compliant per TI product page. Not AEC-Q100 qualified; use TPS54331QDRQ1 for automotive.
