Overview
The TPS54231D is a 2-A, 28-V input, step-down (buck) DC-DC converter produced by Texas Instruments. This device features an integrated high-side n-channel MOSFET and is designed for high-efficiency power-supply applications. It operates with a constant-frequency, current-mode control, which simplifies external frequency compensation and reduces output capacitance. The TPS54231D is available in an 8-pin SOIC package, optimized for improved thermal performance.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Input Voltage Range | 3.5 | - | 28 | V |
| Output Current | - | - | 2 | A |
| Switching Frequency | 400 | 570 | 740 | kHz |
| Minimum Controllable On Time | 105 | 130 | - | ns |
| Maximum Controllable Duty Ratio | 90% | 93% | - | % |
| Current Limit Threshold | 2.3 | 3.5 | 5.3 | A |
| Thermal Shutdown | - | - | 165 | °C |
| Package Type | - | - | 8-SOIC | - |
| Package Size | - | - | 4.90 mm × 3.90 mm | - |
Key Features
- Integrated High-Side MOSFET: The device includes an 80-mΩ high-side MOSFET, enabling high-efficiency power-supply designs.
- Constant-Frequency, Current-Mode Control: Reduces output capacitance and simplifies external frequency compensation design.
- Fixed Switching Frequency: Operates at a fixed switching frequency of 570 kHz.
- Eco-mode Operation: Enters pulse skipping Eco-mode at light load currents to boost efficiency.
- Overcurrent Protection and Frequency Shift: Adjusts switching frequency during overcurrent conditions to prevent inductor current runaway.
- Thermal Shutdown Protection: Protects the device by stopping switching when the junction temperature exceeds 165°C.
- Overvoltage Transient Protection (OVTP): Minimizes output voltage overshoot during fault conditions or strong unload transients.
- Slow Start and Adjustable Output Voltage: Allows for adjustable slow-start time and output voltage using external components.
- WEBENCH Software Support: Aids in design and analysis of circuits using the WEBENCH Software tool.
Applications
- Consumer Electronics: Suitable for set-top boxes, CPE equipment, LCD displays, peripherals, and battery chargers.
- Industrial Power Supplies: Used in 5-V, 12-V, and 24-V distributed power systems.
- Car Audio Power Supplies: Ideal for automotive audio systems.
Q & A
- What is the input voltage range of the TPS54231D?
The input voltage range is from 3.5 V to 28 V.
- What is the maximum output current of the TPS54231D?
The maximum output current is 2 A.
- What is the typical switching frequency of the TPS54231D?
The typical switching frequency is 570 kHz.
- How does the TPS54231D protect against overcurrent conditions?
The device adjusts the switching frequency during overcurrent conditions to prevent inductor current runaway.
- What is the thermal shutdown threshold of the TPS54231D?
The thermal shutdown threshold is 165°C.
- Does the TPS54231D support adjustable output voltage?
Yes, the output voltage is externally adjustable using a resistor divider network.
- What is the purpose of the Eco-mode in the TPS54231D?
The Eco-mode boosts efficiency at light load currents by entering a pulse skipping mode.
- How does the TPS54231D protect against overvoltage transients?
The device includes an overvoltage transient-protection (OVTP) circuit to minimize output voltage overshoot.
- What software tool is available to aid in the design of circuits using the TPS54231D?
The WEBENCH Software tool is available to aid in design and analysis.
- In what package is the TPS54231D available?
The device is available in an 8-pin SOIC package.
