Overview
The TPS54340DDA from Texas Instruments is a high-performance, 42 V input, 3.5 A step-down DC/DC converter. This device is integrated with a high-side MOSFET and features Texas Instruments' Eco-mode™, which enhances efficiency at light loads. The TPS54340DDA is designed to survive load dump pulses up to 45 V per ISO 7637, making it suitable for robust automotive and industrial applications. It offers a wide range of features including current mode control, low ripple pulse skip mode, and adjustable undervoltage lockout (UVLO) voltage. The device is packaged in an 8-terminal thermally enhanced HSOP PowerPAD™ package, ensuring efficient heat dissipation and compact design.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage Range | 4.5 to 42 | V |
| Maximum Absolute Input Voltage | 45 | V |
| Continuous Output Current | 3.5 | A |
| Minimum Peak Inductor Current Limit | 4.5 | A |
| High-Side MOSFET Resistance | 92 | mΩ |
| Operating Quiescent Current | 146 | µA |
| Shutdown Current | 1 | µA |
| Switching Frequency Range | 100 kHz to 2.5 MHz | |
| Internal Voltage Reference | 0.8 V (1%) | |
| Operating Temperature Range | –40°C to 150°C | |
| Package Type | 8-Terminal HSOP with PowerPAD™ |
Key Features
- Current mode control for simple external compensation and flexible component selection
- Eco-mode™ for high efficiency at light loads with pulse skipping
- Low ripple pulse skip mode reducing no-load supply current to 146 µA
- Shutdown supply current reduced to 1 µA when the enable pin is pulled low
- Adjustable undervoltage lockout (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
- Integrated BOOT recharge FET for low dropout at light loads
Applications
The TPS54340DDA is suitable for a variety of applications, including:
- Automotive systems: The device's ability to survive load dump pulses up to 45 V per ISO 7637 makes it ideal for automotive applications.
- Industrial power supplies: Its high efficiency and robust protection features make it a reliable choice for industrial power supply designs.
- Telecommunications: The device's wide input voltage range and high current capability make it suitable for telecommunications equipment.
- Consumer electronics: It can be used in various consumer electronics requiring efficient and reliable power conversion.
Q & A
- What is the input voltage range of the TPS54340DDA?
The input voltage range is from 4.5 V to 42 V, with a maximum absolute input voltage of 45 V.
- What is the continuous output current of the TPS54340DDA?
The continuous output current is 3.5 A, with a minimum peak inductor current limit of 4.5 A.
- What is the operating quiescent current of the TPS54340DDA?
The operating quiescent current is 146 µA.
- What is the shutdown current of the TPS54340DDA?
The shutdown current is 1 µA when the enable pin is pulled low.
- What is the switching frequency range of the TPS54340DDA?
The switching frequency range is from 100 kHz to 2.5 MHz.
- Does the TPS54340DDA have thermal protection?
Yes, the device features thermal shutdown, overvoltage protection, and frequency foldback protection.
- What package type is the TPS54340DDA available in?
The device is available in an 8-terminal thermally enhanced HSOP PowerPAD™ package.
- What is the operating temperature range of the TPS54340DDA?
The operating temperature range is from –40°C to 150°C.
- Does the TPS54340DDA support synchronization to an external clock?
Yes, the device can synchronize to an external clock.
- What is the purpose of Eco-mode™ in the TPS54340DDA?
Eco-mode™ enhances efficiency at light loads by using pulse skipping, reducing the no-load supply current.
