Overview
The TPS54540BDDAR is a high-performance, 42 V, 5 A step-down DC-DC converter produced by Texas Instruments. This device is designed to provide high efficiency and reliability in a variety of applications. It features an integrated high-side n-channel MOSFET and operates in a constant frequency, current mode control architecture. The TPS54540BDDAR supports a wide input voltage range from 4.5 V to 42 V and can deliver up to 5 A of continuous output current. The device is particularly notable for its Eco-mode operation, which enhances efficiency at light loads by reducing switching and gate drive losses.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Input Voltage (VIN) | 4.5 | - | 42 | V |
| Output Voltage (VO) | 0.8 | - | 41.1 | V |
| Output Current (IO) | 0 | - | 5 | A |
| Junction Temperature (TJ) | -40 | - | 150 | °C |
| Switching Frequency | 100 kHz | - | 2.5 MHz | - |
| High-Side MOSFET Resistance | - | 92 mΩ | - | - |
| Operating Quiescent Current | - | 146 μA | - | - |
| Shutdown Current | - | 2 μA | - | - |
Key Features
- High efficiency at light loads with pulse skipping Eco-mode
- Integrated 92 mΩ high-side MOSFET
- Wide switching frequency range of 100 kHz to 2.5 MHz
- Synchronizes to external clock signal
- Low dropout operation with integrated BOOT recharge FET
- Adjustable undervoltage lockout (UVLO) voltage and hysteresis
- Internal 0.8 V 1% voltage reference
- 8-terminal HSOP with PowerPAD package
- Thermal shutdown and frequency foldback for overload protection
- Internal soft-start circuit to reduce in-rush current and output voltage overshoot
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 TPS54540BDDAR?
The input voltage range is from 4.5 V to 42 V.
- What is the maximum output current of the TPS54540BDDAR?
The maximum output current is 5 A.
- What is the operating junction temperature range of the TPS54540BDDAR?
The operating junction temperature range is from -40°C to 150°C.
- What is the switching frequency range of the TPS54540BDDAR?
The switching frequency range is from 100 kHz to 2.5 MHz.
- Does the TPS54540BDDAR have an integrated high-side MOSFET?
Yes, it has an integrated 92 mΩ high-side MOSFET.
- What is the purpose of the Eco-mode in the TPS54540BDDAR?
The Eco-mode enhances efficiency at light loads by reducing switching and gate drive losses.
- How does the TPS54540BDDAR synchronize with an external clock signal?
The device has an internal phase-locked loop (PLL) that synchronizes the power switch turn-on to a falling edge of an external clock signal.
- What is the quiescent current of the TPS54540BDDAR under no-load conditions?
The quiescent current is 146 μA under no-load conditions.
- What is the shutdown current of the TPS54540BDDAR?
The shutdown current is 2 μA.
- What are some common applications of the TPS54540BDDAR?
Common applications include industrial automation, vehicle accessories, USB charging ports, and industrial power systems.
