Overview
The TPS54340DDAR is a high-input-voltage, 3.5A synchronous buck DC/DC converter from Texas Instruments, designed for industrial control, communication equipment, automotive electronics, and distributed power systems. This device integrates a high-side MOSFET, supports a wide input voltage range, and can directly convert from 12V, 24V, or even higher voltage rails to the stable power required by low-voltage digital circuits.
The TPS54340DDAR employs a current-mode control architecture, offering excellent load transient response and high conversion efficiency. The device supports adjustable switching frequency, external synchronization, and Eco-mode™ power saving, helping engineers achieve an optimal balance between efficiency, EMI, and system size, making it a classic solution for industrial power supply designs.
Core parameters
| Parameter | Value |
| Product Type | Synchronous buck DC/DC converter |
| Input voltage range | 4.5V to 42V |
| Output voltage range | 0.8V to 39V (adjustable) |
| Maximum output current | 3.5A |
| Switching frequency | 100kHz to 2.5MHz (adjustable) |
| Control Architecture | Current mode control |
| Reference voltage | 0.8V |
| Static current | Low power design |
| Protection function | Overcurrent, overvoltage, undervoltage lockout, thermal shutdown |
| Encapsulation type | SO-PowerPAD-8 (DDA) |
| Operating temperature range | -40°C to +150°C (junction temperature) |
| Environmental standards | RoHS compliant |
Features
Wide input voltage range design
The TPS54340DDAR supports input voltages from 4.5V to 42V and can be directly applied to 12V, 24V and 36V industrial power supply systems, reducing the need for pre-conversion.
Up to 3.5A output capability
It integrates high-performance MOSFETs and can provide up to 3.5A of continuous output current to meet the power supply requirements of MCUs, FPGAs, communication modules and industrial controllers.
Adjustable switching frequency optimization design
It supports a wide frequency adjustment range from 100kHz to 2.5MHz, allowing engineers to flexibly optimize their designs based on efficiency, EMI, and peripheral device size requirements.
Eco-mode™ improves efficiency under light loads
When operating under light load, it automatically enters energy-saving mode to reduce switching losses and static power consumption, thereby improving overall power efficiency.
Complete protection mechanism
It integrates overcurrent protection (OCP), thermal shutdown (TSD), undervoltage lockout (UVLO), and overvoltage protection (OVP), effectively improving system reliability and safety.
Typical application scenarios
Industrial automation systems
PLC, industrial controller, sensor node and data acquisition equipment.
Communication and network equipment
Switches, routers, wireless communication modules, and base station equipment.
Power distribution system
24V industrial busbar to 5V, 3.3V or 1.8V power conversion.
Embedded control platform
Power supply design for FPGA, DSP, MCU and single-board computer.
Automotive electronics and in-vehicle equipment
Vehicle control modules, infotainment systems, and auxiliary electronic devices.
Comparative Advantage Analysis
| Performance indicators | TPS54340DDAR | Standard Buck converter |
| Input voltage range | Wide range (4.5V~42V) | Narrower |
| Output current | Up to 3.5A | 1A~2A |
| Switching frequency regulation | support | Partial support |
| Industrial applicability | excellent | generally |
| Protection function | whole | Base |
| System flexibility | high | medium |
The TPS54340DDAR significantly outperforms ordinary buck converters in terms of wide input range, high output capability, and industrial-grade reliability, making it particularly suitable for industrial and communication power supply designs.
Manufacturer Profile: Texas Instruments
Texas Instruments (TI) is a leading global manufacturer of analog and power management semiconductors, with deep technological expertise in DC/DC converters, embedded processors, and industrial control. Its TPS series power products are widely used in the industrial, automotive, and consumer electronics markets due to their high efficiency, high reliability, and long-term availability.
Why choose TPS54340DDAR?
● Supports a wide input voltage range up to 42V
● Maximum output current capability of 3.5A
● Adjustable switching frequency optimizes system design
● Eco-mode™ improves light-load efficiency
● Integrated comprehensive protection mechanisms
● TI original quality and mature technology support
Frequently Asked Questions (FAQ)
Q1: Can the TPS54340DDAR be used directly in a 24V industrial power supply system?
Yes. The TPS54340DDAR supports input voltages up to 42V and can directly convert 24V industrial power supplies to common voltage rails such as 12V, 5V, and 3.3V without requiring an additional pre-regulator circuit.
Q2: Is this device suitable for powering FPGAs or MCUs?
Absolutely. Its 3.5A output capability and stable current-mode control architecture provide efficient and stable power support for FPGAs, DSPs, MCUs, and communication processors.
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