Overview
The TPS54540DDA is a 42 V, 5 A step-down (buck) regulator produced by Texas Instruments. It features an integrated high-side n-channel MOSFET and operates using constant frequency, current mode control. This device is designed to survive load dump pulses up to 45 V per ISO 7637, making it suitable for various high-reliability applications. The TPS54540DDA offers high efficiency at light loads through its Eco-mode™ operation and supports a wide switching frequency range of 100 kHz to 2.5 MHz, allowing for optimization of either efficiency or external component size.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage Range | 4.5 to 42 | V |
| Output Current | Up to 5 | A |
| Switching Frequency Range | 100 kHz to 2.5 MHz | |
| High-Side MOSFET On-State Resistance | 92 mΩ | |
| Operating Quiescent Current | 146 μA | |
| Shutdown Current | 2 μA | |
| Internal Voltage Reference | 0.8 V ± 1% | |
| Operating Temperature Range | –40°C to 150°C | |
| Package Type | 8-Terminal HSOP with PowerPAD™ |
Key Features
- High Efficiency at Light Loads with Pulse Skipping Eco-mode™
- 92-mΩ High-Side MOSFET for high efficiency power supply designs
- Low Dropout at Light Loads with Integrated BOOT Recharge FET
- Adjustable UVLO Voltage and Hysteresis
- 0.8 V 1% Internal Voltage Reference
- Wide Switching Frequency Range (100 kHz to 2.5 MHz) and Synchronization to External Clock
- Internal Soft-Start Circuit to reduce in-rush current and output voltage overshoot
- Frequency Foldback and Thermal Shutdown for Overload Protection
- Integrated Bootstrap Voltage Regulator and Low Side MOSFET for High Duty Cycle Operation
Applications
- Industrial Automation and Motor Control
- Vehicle Accessories: GPS, Entertainment Systems
- USB Dedicated Charging Ports and Battery Chargers
- 12 V and 24 V Industrial, Automotive, and Communications Power Systems
Q & A
- What is the input voltage range of the TPS54540DDA?
The input voltage range is from 4.5 V to 42 V.
- What is the maximum output current of the TPS54540DDA?
The maximum output current is up to 5 A.
- What is the switching frequency range of the TPS54540DDA?
The switching frequency range is from 100 kHz to 2.5 MHz.
- What is the on-state resistance of the high-side MOSFET?
The on-state resistance of the high-side MOSFET is 92 mΩ.
- What is the operating quiescent current of the TPS54540DDA?
The operating quiescent current is 146 μA.
- What is the shutdown current of the TPS54540DDA?
The shutdown current is 2 μA.
- What is the internal voltage reference of the TPS54540DDA?
The internal voltage reference is 0.8 V ± 1%.
- What is the operating temperature range of the TPS54540DDA?
The operating temperature range is from –40°C to 150°C.
- What type of package does the TPS54540DDA come in?
The TPS54540DDA comes in an 8-Terminal HSOP with PowerPAD™ package.
- What are some common applications of the TPS54540DDA?
Common applications include industrial automation, vehicle accessories, USB charging ports, and industrial, automotive, and communications power systems.
