TPS54331DR-P Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
TPS54331DR-P is a 3 A synchronous step-down DC-DC converter from Texas Instruments, switching at 570 kHz with an input voltage range of 3.5 V to 28 V and featuring Eco-mode for improved light-load efficiency. The integrated high-side MOSFET and current-mode control enable a compact external component set, while the adjustable output voltage suits a wide range of digital and analog power rails. Housed in an 8-pin SOIC, it is ideal for industrial, telecom, and automotive point-of-load applications.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- TPS54331DR-P Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 3 A continuous output current step-down (buck) converter
- Wide input voltage range 3.5 V to 28 V for 5 V, 12 V, and 24 V bus operation
- 570 kHz fixed switching frequency for compact magnetics design
- Eco-mode light-load operation for improved system efficiency
- Integrated high-side MOSFET reduces external component count
- Adjustable output voltage down to 0.8 V reference
- 8-pin SOIC SMD package for standard PCB assembly
Applications
TPS54331DR-P is designed for point-of-load DC-DC conversion in industrial automation, telecommunications equipment, and 12 V to 24 V bus-powered embedded systems requiring a regulated 1 V to 10 V output at up to 3 A. Its Eco-mode and wide input range also make it suitable for battery-powered portable equipment and automotive accessory circuits where both efficiency across load range and input transient tolerance are critical.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for TPS54331DR-P:
Switching Regulator, Current-mode, 3A, 570kHz Switching Freq-Max, BICMOS, PDSO8
Switching Regulator, Current-mode, 3A, 570kHz Switching Freq-Max, BICMOS, PDSO8
Frequently Asked Questions
What switching frequency does TPS54331DR-P use, and how does it affect the size of the external inductor?
TPS54331DR-P switches at a fixed 570 kHz, which allows designers to use inductors in the 3.3 µH to 10 µH range rather than the larger 22 µH to 100 µH inductors required at 100 kHz–200 kHz switching rates. This smaller inductance reduces component size and PCB footprint, making the device well-suited for compact 3 A point-of-load converter designs on dense industrial and communications boards.
How does the Eco-mode feature of TPS54331DR-P improve efficiency in battery-powered designs?
In Eco-mode, TPS54331DR-P enters a pulse-skipping operation at light loads below approximately 100 mA, reducing switching losses and gate-drive power to improve efficiency from the typical 60–70% at light load to above 80% or higher. This mode is automatically entered and exited based on load current, so no external control signal is required, simplifying firmware for battery-powered IoT gateways, portable instruments, and standby-mode industrial sensors.
Can TPS54331DR-P regulate an output voltage of 1.2 V from a 12 V industrial bus input?
Yes, TPS54331DR-P supports output voltages adjustable down to its 0.8 V internal reference by setting an external resistor divider between VOUT and the feedback pin. A 12 V input to 1.2 V output conversion at 3 A represents a duty cycle of 10%, which is within the device's minimum on-time capability at 570 kHz, making it a practical choice for FPGA core supply and DDR memory termination rails in 12 V industrial panel computers.
How wide is the input range of TPS54331DR-P and what input transient conditions can it survive?
TPS54331DR-P accepts input voltages from 3.5 V to 28 V continuously, enabling direct operation from 5 V USB-C, 12 V desktop, and 24 V industrial bus rails within a single design. The 28 V maximum rating also provides margin against 12 V automotive load dump transients and 24 V industrial bus overvoltage spikes, reducing the need for external transient voltage suppressors in many typical application environments.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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