Overview
The TPS54340DDAR from Texas Instruments is a high-performance, 42 V input, 3.5 A step-down DC/DC converter integrated with a high-side MOSFET. This device is designed to operate efficiently across a wide input voltage range of 4.5 V to 42 V, with an absolute maximum voltage of 45 V, making it suitable for various industrial, automotive, and communications power systems. The converter features current mode control, which provides simple external compensation and flexible component selection. It also includes an Eco-mode™ that enhances efficiency at light loads through pulse skipping, reducing the no-load supply current to 146 µA and shutdown supply current to 1 µA when the enable pin is pulled low.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage Range | 4.5 V to 42 V (45 V Abs Max) | V |
| Continuous Output Current | 3.5 A | A |
| Minimum Peak Inductor Current Limit | 4.5 A | A |
| High-Side MOSFET Resistance | 92 mΩ | mΩ |
| Operating Quiescent Current | 146 µA | µA |
| Shutdown Current | 1 µA | µA |
| Switching Frequency Range | 100 kHz to 2.5 MHz | kHz to MHz |
| Internal Voltage Reference | 0.8 V ± 1% | V |
| Package Type | 8-Terminal HSOP with PowerPAD™ | |
| Operating Junction Temperature Range | –40°C to 150°C | °C |
Key Features
- High efficiency at light loads with Pulse Skipping Eco-mode™
- Low dropout at light loads with integrated BOOT Recharge FET
- Current mode control for simple external compensation and flexible component selection
- Adjustable UVLO voltage and hysteresis
- Internal soft-start to eliminate overshoot during startup
- Accurate cycle-by-cycle current limit
- Thermal, overvoltage, and frequency foldback protection
- Synchronizes to external clock
Applications
The TPS54340DDAR is suitable for a variety of applications, including:
- Industrial power systems: 12 V, 24 V systems
- Automotive systems: Survives load dump pulses up to 45 V per ISO 7637
- Communications power systems: Efficient power supply for communication equipment
- Other applications requiring high-efficiency step-down DC/DC conversion
Q & A
- What is the input voltage range of the TPS54340DDAR?
The input voltage range is 4.5 V to 42 V, with an absolute maximum voltage of 45 V.
- What is the continuous output current of the TPS54340DDAR?
The continuous output current is 3.5 A.
- What is the operating quiescent current of the TPS54340DDAR?
The operating quiescent current is 146 µA.
- What is the shutdown current of the TPS54340DDAR?
The shutdown current is 1 µA when the enable pin is pulled low.
- What is the switching frequency range of the TPS54340DDAR?
The switching frequency range is 100 kHz to 2.5 MHz.
- Does the TPS54340DDAR support synchronization to an external clock?
Yes, it supports synchronization to an external clock.
- What kind of protection does the TPS54340DDAR offer?
The device offers thermal, overvoltage, and frequency foldback protection.
- What is the package type of the TPS54340DDAR?
The package type is an 8-terminal HSOP with PowerPAD™.
- What is the operating junction temperature range of the TPS54340DDAR?
The operating junction temperature range is –40°C to 150°C.
- Is the TPS54340DDAR suitable for automotive applications?
Yes, it is suitable for automotive applications and can survive load dump pulses up to 45 V per ISO 7637.
