TPS54331DR - 3A, 28V Buck Converter, 570kHz | Texas Instruments
MPN: TPS54331DR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.85 | $1.85 |
| 10 | $1.66 | $16.60 |
| 100 | $1.35 | $135.00 |
| 500 | $1.12 | $560.00 |
| 1,000 | $0.95 | $950.00 |
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:
TPS54331DDAR
✅ Drop-In📋 Reference alternative (not in catalog)
TPS5430DDAR
⚡ Same Package✓ In Stock
$1.29 / Unit
View Datasheet →TPS54620
⚡ Same Package✓ In Stock
$2.19 / Unit
View Datasheet →TPS54360DDAR
⚡ Same Package✓ In Stock
$1.6 / Unit
View Datasheet →TPS54331DR Maximum Ratings & Electrical Characteristics
| Topology | Non-synchronous Buck (Step-Down) |
| Input Voltage Range | 3.5 V to 28 V |
| Output Voltage Range | 0.8 V to 25 V (adjustable) |
| Maximum Output Current | 3 A |
| Switching Frequency | 570 kHz (fixed) |
| Control Architecture | Current mode with internal slope compensation |
| Light Load Feature | Eco-mode pulse skipping |
| Shutdown Supply Current | 1 uA |
| Integrated MOSFET | Low RDS(on) high-side MOSFET |
| Protection Features | Overcurrent protection, thermal shutdown, adjustable soft-start |
| Number of Outputs | 1 |
| Operating Temperature | -40C to +150C (TJ) |
| Package | 8-SOIC (0.154in, 3.90mm Width), D |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Lifecycle Status | Active |
TPS54331DR Pin Configuration
| Pin 1 | BOOT — Bootstrap capacitor connection for high-side gate drive |
| Pin 2 | VIN — Input supply voltage, 3.5V to 28V |
| Pin 3 | EN — Enable pin with internal pullup; pull low to disable |
| Pin 4 | SS/TR — Soft-start / tracking pin; capacitor sets startup time |
| Pin 5 | VSENSE — Feedback voltage sense input (0.8V reference) |
| Pin 6 | COMP — Error amplifier output for external loop compensation RC network |
| Pin 7 | GND — Ground |
| Pin 8 | PH — Phase node / switch output to inductor and catch diode |
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, Set-Top Boxes and Consumer Electronics, LCD Display Power, Distributed Power Systems, FPGA, DSP, and Microcontroller Core Power, Battery-Powered Equipment.
Industrial Power Supplies
The TPS54331DR's 3.5V-28V input range directly accepts industrial 12V and 24V bus rails, stepping down to 0.8V-25V at up to 3A. Current mode control provides fast line transient response for factory environments with noisy supplies, while cycle-by-cycle current limiting and thermal shutdown protect against fault conditions. Eco-mode pulse skipping keeps light-load efficiency high during standby states, reducing system power consumption in always-on industrial equipment.
Recommended
Set-Top Boxes and Consumer Electronics
Consumer set-top boxes require cost-efficient, compact 5V/3.3V rails from 12V adapters. The TPS54331DR's fixed 570kHz switching frequency allows small inductors and output capacitors, fitting space-constrained boards, while its low external BOM (single catch diode, non-synchronous topology) reduces cost. Eco-mode maintains efficiency when the system idles, and adjustable soft-start prevents input inrush issues during power-on.
Recommended
LCD Display Power
LCD monitors and displays distribute power from 12V or 24V adapters to logic, backlight drivers, and panel timing controllers. The TPS54331DR's 3A output powers panel logic rails, and its wide 0.8V-25V adjustable output covers multiple rail voltages with a single design. Adjustable soft-start enables sequenced power-up of display rails, preventing latch-up in timing controllers, and 570kHz operation keeps switching noise outside sensitive video bands.
Recommended
Distributed Power Systems
In distributed power architectures, a 24V intermediate bus feeds point-of-load converters at each card or module. The TPS54331DR accepts the 24V bus directly with headroom to 28V, delivering up to 3A locally and avoiding costly bus converters. Current mode control simplifies compensation across varying loads, and the 1-uA shutdown current lets unused modules power down their local rails to near-zero consumption.
Recommended
FPGA, DSP, and Microcontroller Core Power
FPGAs, DSPs, and microcontrollers such as TI C2000 devices need precise core rails (e.g., 1.2V, 1.8V, 3.3V) derived from 12V supplies. The TPS54331DR sets output via a resistor divider with 0.8V reference accuracy, and adjustable soft-start supports the staggered rail sequencing these processors require. Its 3A capability covers core currents during startup transients when FPGA I/O banks charge simultaneously.
Recommended
Battery-Powered Equipment
Portable and battery-backed instruments benefit from the TPS54331DR's 1-uA shutdown supply current, which preserves battery charge when the converter is disabled. Eco-mode pulse skipping maintains high efficiency at the light loads typical of standby operation, extending runtime. The 3.5V minimum input supports single-cell lithium stacks near end of discharge, and overcurrent and thermal protection guard against battery fault conditions.
Recommended
Recommended Products Summary
Engineering reference data for TPS54331DR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TPS54331DDAR | TPS5430DDAR | TPS54620 | TPS54360DDAR |
|---|---|---|---|---|---|
| Package | 8-SOIC (D) | 8-SOIC PowerPAD (DDA) | 8-SOIC PowerPAD (DDA) | 8-SOIC PowerPAD (DDA) | 8-SOIC PowerPAD (DDA) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Input Voltage Range | 3.5 V to 28 V | 3.5 V to 28 V | [DATA_NEEDED: input range] | 4.5 V to 17 V | 4.5 V to 60 V |
| Output Current | 3 A | 3 A | 3 A | [DATA_NEEDED: output current] | 3.5 A |
| Switching Frequency | 570 kHz | 570 kHz | 500 kHz | [DATA_NEEDED: frequency] | [DATA_NEEDED: frequency] |
| Topology | Non-synchronous buck | Non-synchronous buck | Non-synchronous buck | Synchronous buck | Synchronous buck |
| Eco-mode / Light-Load Efficiency | Yes (Eco-mode pulse skipping) | Yes | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
| Thermal Package Performance | Standard SOIC (no thermal pad) | PowerPAD - improved thermals | PowerPAD - improved thermals | PowerPAD - improved thermals | PowerPAD - improved thermals |
Key Differentiators
- Eco-mode light-load efficiency (vs TPS54620)
- Wider input range than synchronous sibling (vs TPS54620)
- Identical die available with PowerPAD (vs TPS54331DDAR)
Design Notes
Minimize the high-frequency switching loop: input capacitor, PH pin, catch diode, and GND must be connected with short, wide traces. Place the BOOT capacitor within 2-3 mm of the BOOT pin - a long bootstrap trace causes unreliable high-side gate drive and erratic switching. Use a solid ground plane with vias close to the input capacitor ground terminal. Per TI datasheet layout guidelines, keep the VSENSE feedback trace away from the SW node and inductor to avoid noise coupling.
The standard 8-SOIC (D) package has higher thermal resistance than the PowerPAD (DDA) variant. At 3A loads with large VIN-VOUT differences (e.g., 24V to 1.8V), junction temperatures can approach the 150C limit at elevated ambient. Estimate dissipation from datasheet curves; if marginal, switch to TPS54331DDAR whose exposed pad solders to a copper pour, significantly reducing theta_JA. Add thermal vias under the catch diode as well.
The COMP pin requires an external RC network for loop compensation - values depend on output voltage, inductance, and output capacitance per datasheet formulas; using default values without calculation risks instability with low-ESR ceramic outputs. Also, the catch diode must be rated for the full input voltage and average output current; a diode with excessive reverse recovery at 570kHz degrades efficiency and can cause switching node ringing that violates the PH pin absolute maximum rating.
Compliance Information
RoHS compliant per TI product page and distributor listings. AEC-Q100 qualification not specified for this part in provided data.
