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The TPS54331DR is a non-synchronous step-down DC-DC converter manufactured by Texas Instruments, supplied in an 8-pin SOIC (D) package. It accepts an input voltage from 3.5 V to 28 V and delivers up to 3 A of continuous output current, with an adjustable output voltage as low as 0.8 V. The device integrates an 80 mΩ high-side MOSFET, reducing the external component count and board area required for a complete buck regulator design. A fixed 570 kHz switching frequency balances inductor size and conversion efficiency, while the pulse-skipping Eco-mode feature maintains efficiency at light loads by reducing switching cycles when the load current drops below a threshold. With a typical shutdown quiescent current of 1 µA, the TPS54331DR is also suitable for battery-powered systems where standby power draw must be minimized. The part is rated for a junction temperature range of -40°C to 150°C and includes cycle-by-cycle current limiting, frequency foldback, overvoltage transient protection, and thermal shutdown.
The TPS54331DR supports a wide input voltage span from 3.5 V to 28 V, covering common 5 V, 12 V, and 24 V industrial supply rails as well as multi-cell battery packs. The integrated 80 mΩ high-side MOSFET enables up to 3 A continuous output current without an external power switch, simplifying the bill of materials for point-of-load and intermediate bus converter designs.
The output voltage is set by an external resistor divider and can be adjusted from 0.8 V up to approximately 25 V, limited by the maximum 90% duty cycle. Current-mode control with internal slope compensation simplifies external compensation network design and allows the use of ceramic output capacitors, reducing both component count and solution footprint.
At light load currents, the TPS54331DR automatically enters pulse-skipping Eco-mode, which reduces switching frequency and associated gate-drive losses to maintain efficiency. In shutdown mode, the typical quiescent current is 1 µA, making the device suitable for always-on industrial sensors, remote monitoring nodes, and battery-backed systems where standby power consumption is a design constraint.
The converter includes adjustable soft-start to limit inrush current during power-up, a programmable undervoltage lockout (UVLO) threshold via an external resistor divider, overvoltage transient protection to suppress output overshoot during start-up and load transients, cycle-by-cycle current limit with frequency foldback during overload, and thermal shutdown. These features reduce the need for external protection circuitry in harsh industrial environments.
Manufacturer | Texas Instruments |
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Topology | Non-Synchronous Buck (Step-Down) |
Input Voltage Range (Vin) | 3.5 V to 28 V |
Output Voltage Range (Vout) | 0.8 V to 25 V (adjustable) |
Continuous Output Current (Iout) | 3 A |
Switching Frequency | 570 kHz (fixed) |
High-Side MOSFET RDS(on) | 80 mΩ (typical) |
Shutdown Quiescent Current | 1 µA (typical) |
Operating Junction Temperature | -40°C to 150°C |
Maximum Duty Cycle | 90% |
Control Mode | Current Mode with Internal Slope Compensation |
Package | SOIC-8 (D) |
Features | Eco-mode, Adjustable Soft-Start, Programmable UVLO, OVP, Thermal Shutdown |
The TPS54331DR is used in 12 V and 24 V industrial control systems to generate regulated 3.3 V, 5 V, or custom voltage rails for microcontrollers, sensors, and communication transceivers. In factory automation equipment such as PLC I/O modules, motor drivers, and HMI panels, the wide input range and 3 A output capacity support multiple downstream loads from a single intermediate bus. The device is also deployed in battery-powered test and measurement instruments, where the 1 µA shutdown current extends battery standby life. Additional applications include set-top boxes, networking equipment, and automotive after-market electronics (subject to appropriate qualification), where a compact, non-synchronous buck regulator with integrated protection features is required.
The TPS54331DR operates from a 3.5 V to 28 V input voltage range, covering common 5 V, 12 V, and 24 V industrial supply rails.
The TPS54331DR can deliver up to 3 A of continuous output current, supported by an integrated 80 mΩ high-side MOSFET.
The device uses a fixed 570 kHz switching frequency, which balances inductor size and conversion efficiency for most industrial buck designs.
The TPS54331 is available in an 8-pin SOIC (D) package and an 8-pin HSOIC PowerPAD (DDA) package with enhanced thermal dissipation. The TPS54331DR specifically refers to the SOIC-8 (D) variant.
Yes, the device features pulse-skipping Eco-mode that automatically activates at light loads to reduce switching losses and maintain efficiency, with a typical 1 µA shutdown current for battery-powered applications.
