Overview
The TPS54540BDDA is a 42-V, 5-A step-down (buck) regulator produced by Texas Instruments. This device features an integrated high-side n-channel MOSFET and operates using constant frequency, current-mode control. This control mechanism simplifies external frequency compensation and reduces the need for output capacitance. The regulator is designed to provide high efficiency, especially at light loads, through its pulse skipping Eco-mode™. It also includes a wide switching frequency range of 100 kHz to 2.5 MHz, allowing for optimization of either efficiency or external component size. The TPS54540BDDA is available in an 8-pin thermally enhanced HSOIC PowerPAD package, ensuring good thermal performance over a wide operating temperature range of –40°C to 150°C.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage Range | 4.5 to 42 | V |
| Output Current | 5 | A |
| Switching Frequency Range | 100 kHz to 2.5 MHz | |
| High-Side MOSFET Resistance | 92 mΩ | |
| Operating Quiescent Current | 146 μA | |
| Shutdown Current | 2 μA | |
| Internal Voltage Reference | 0.8 V ± 1% | |
| Operating Temperature Range | –40 to 150 | °C |
| Package Type | 8-Pin HSOIC with PowerPAD™ |
Key Features
- High efficiency at light loads with pulse skipping Eco-mode™.
- 92-mΩ high-side MOSFET for low resistance and high efficiency.
- Low operating quiescent current of 146 μA and shutdown current of 2 μA.
- Wide switching frequency range of 100 kHz to 2.5 MHz, allowing for optimization of efficiency or component size.
- Synchronizes to an external clock using the RT/CLK pin.
- Low dropout at light loads with integrated BOOT recharge FET.
- Adjustable undervoltage lockout (UVLO) and hysteresis.
- Internal 0.8 V ± 1% voltage reference.
- Thermally enhanced 8-pin HSOIC PowerPAD package.
- Operating temperature range of –40°C to 150°C.
- Support for custom design using the WEBENCH® Power Designer.
Applications
- Industrial automation and motor control.
- Vehicle accessories such as GPS, entertainment systems, and USB dedicated charging ports.
- Battery chargers.
- 12-V and 24-V industrial, automotive, and communications power systems.
Q & A
- What is the input voltage range of the TPS54540BDDA?
The input voltage range is from 4.5 V to 42 V.
- What is the maximum output current of the TPS54540BDDA?
The maximum output current is 5 A.
- What is the switching frequency range of the TPS54540BDDA?
The switching frequency range is from 100 kHz to 2.5 MHz.
- What is the resistance of the high-side MOSFET in the TPS54540BDDA?
The high-side MOSFET has a resistance of 92 mΩ.
- What is the operating quiescent current of the TPS54540BDDA?
The operating quiescent current is 146 μA.
- How does the TPS54540BDDA handle light load conditions?
The device operates in a pulse skipping Eco-mode at light loads to improve efficiency by reducing switching and gate drive losses.
- What is the package type of the TPS54540BDDA?
The device is packaged in an 8-pin thermally enhanced HSOIC with PowerPAD™.
- What is the operating temperature range of the TPS54540BDDA?
The operating temperature range is from –40°C to 150°C.
- Can the TPS54540BDDA be synchronized to an external clock?
Yes, the device can be synchronized to an external clock using the RT/CLK pin.
- How can the output voltage of the TPS54540BDDA be adjusted?
The output voltage can be adjusted using a resistor divider from the output node to the FB pin.
