Overview
The TPS5450-Q1, produced by Texas Instruments, is a high-performance, 5-A step-down DC/DC converter designed for automotive and other high-density point-of-load applications. It is part of the SWIFT™ family of DC/DC regulators and features a wide input voltage range of 5.5 V to 36 V, making it versatile for various power systems. The converter integrates a low-resistance, high-side N-channel MOSFET and includes several protection and regulation features to ensure reliable operation.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Input Voltage Range | 5.5 | 36 | V | |
| Output Current | 5 | 6 | A | |
| Switching Frequency | 400 | 500 | 600 | kHz |
| Voltage Reference Accuracy | 1.202 | 1.221 | 1.239 | V |
| Quiescent Current (Shutdown) | 18 | 50 | μA | |
| High-Side MOSFET On-Resistance | 110 | 150 | 230 | mΩ |
| Thermal Shutdown Trip Point | 135 | 162 | °C | |
| Operating Junction Temperature | -40 | 125 | °C |
Key Features
- Wide input voltage range: 5.5 V to 36 V
- Up to 5-A continuous (6-A peak) output current
- High efficiency greater than 90% enabled by a 110-mΩ integrated MOSFET switch
- Fixed 500-kHz switching frequency for small filter size
- Internal compensation minimizes external parts count
- Improved line regulation and transient response by input voltage feed forward
- System protected by overcurrent limiting, thermal shutdown, and overvoltage protection
- Low shutdown supply current of 18 μA (typical)
- Internal slow-start circuit to limit inrush currents
Applications
- Automotive systems
- High-density point-of-load regulators
- LCD and plasma displays
- Battery chargers
- 12-V/24-V distributed power systems
Q & A
- What is the input voltage range of the TPS5450-Q1?
The input voltage range is from 5.5 V to 36 V. - What is the maximum continuous output current of the TPS5450-Q1?
The maximum continuous output current is 5 A, with a peak current of 6 A. - What is the switching frequency of the TPS5450-Q1?
The switching frequency is fixed at 500 kHz. - What is the typical quiescent current in shutdown mode?
The typical quiescent current in shutdown mode is 18 μA. - Does the TPS5450-Q1 have overvoltage protection?
Yes, it includes an overvoltage protection circuit to minimize voltage overshoot. - What is the thermal shutdown trip point of the TPS5450-Q1?
The thermal shutdown trip point is between 135°C and 162°C. - How does the internal slow-start circuit function?
The internal slow-start circuit ramps up the reference voltage from 0 V to its final value linearly to limit inrush currents, with a typical slow-start time of 8 ms. - What type of compensation does the TPS5450-Q1 use?
The TPS5450-Q1 uses internal compensation to simplify the regulator design, employing a type 3 compensation network. - What is the purpose of the voltage feed-forward circuit?
The voltage feed-forward circuit provides a constant DC power stage gain despite variations in the input voltage, improving the transient response. - How should the ENA pin be controlled?
The ENA pin should be controlled using open drain or open collector output logic to enable or disable the regulator.
