Overview
The TPS5450DDA from Texas Instruments is a high-output-current PWM converter designed for efficient and reliable power management. This step-down (buck) regulator integrates a low-resistance, high-side N-channel MOSFET, enabling high-efficiency power-supply designs. The device features a wide input voltage range of 5.5 V to 36 V and can deliver up to 5 A of continuous output current, with a peak current of 6 A. It is particularly suited for applications requiring high current and tight voltage regulation, such as high-density point-of-load regulators, LCD and plasma displays, and 12-V and 24-V distributed power systems.
Key Specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | 8-Pin SOIC PowerPAD™ (HSOIC DDA) |
| Input Voltage Range | 5.5 V to 36 V |
| Output Current | Up to 5 A continuous (6 A peak) |
| Output Voltage Range | Adjustable down to 1.22 V with 1.5% initial accuracy |
| Switching Frequency | Fixed 500 kHz |
| Efficiency | Greater than 90% |
| Shutdown Supply Current | 18 µA typical |
| Operating Junction Temperature Range | –40°C to 125°C |
| MOSFET Resistance | 110 mΩ integrated MOSFET switch |
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 110-mΩ integrated MOSFET switch
- Wide output voltage range: adjustable down to 1.22 V with 1.5% initial accuracy
- Internal compensation minimizes external part count
- Fixed 500-kHz switching frequency for small filter size
- 18-µA shutdown supply current
- Improved line regulation and transient response by input voltage feedforward
- System protected by overcurrent limiting, overvoltage protection, and thermal shutdown
- Available in small thermally enhanced 8-pin SOIC PowerPAD™ package
Applications
- High-density point-of-load regulators
- LCD and plasma displays
- Battery chargers
- 12-V and 24-V distributed power systems
Q & A
- What is the input voltage range of the TPS5450DDA?
The input voltage range is 5.5 V to 36 V.
- What is the maximum continuous output current of the TPS5450DDA?
The maximum continuous output current is up to 5 A, with a peak current of 6 A.
- What is the switching frequency of the TPS5450DDA?
The switching frequency is fixed at 500 kHz.
- How efficient is the TPS5450DDA?
The efficiency is greater than 90%, enabled by the 110-mΩ integrated MOSFET switch.
- What is the shutdown supply current of the TPS5450DDA?
The shutdown supply current is typically 18 µA.
- What protection features does the TPS5450DDA have?
The device is protected by overcurrent limiting, overvoltage protection, and thermal shutdown.
- What is the operating junction temperature range of the TPS5450DDA?
The operating junction temperature range is –40°C to 125°C.
- What package type is the TPS5450DDA available in?
The device is available in a small thermally enhanced 8-pin SOIC PowerPAD™ package.
- How does the internal compensation of the TPS5450DDA benefit the design?
The internal compensation minimizes the external part count, simplifying the regulator design.
- What is the purpose of the voltage feed-forward circuit in the TPS5450DDA?
The voltage feed-forward circuit improves the line regulation and transient response by maintaining a constant DC power stage gain despite input voltage variations.
