Overview
The LM2575D2T-5R4 is a part of the LM2575 series of Buck Switching Regulators, which are monolithic integrated circuits designed for easy and convenient implementation of step-down switching regulators (buck converters). These devices are capable of driving a 1.0 A load with excellent line and load regulation. The LM2575D2T-5R4 specifically provides a fixed output voltage of 5.0 V.
This regulator is designed to minimize the number of external components, simplifying power supply design. It offers high efficiency, especially with higher input voltages, making it a superior choice over traditional three-terminal linear regulators. The LM2575 series also includes features such as external shutdown, cycle-by-cycle current limiting, and thermal shutdown for full protection under fault conditions.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Output Voltage | 4.9 - 5.1 | V |
| Input Voltage Range | 8.0 - 40 | V |
| Output Current | 1.0 | A |
| Efficiency (Vin = 12 V, ILoad = 1.0 A) | 77 | % |
| Maximum Supply Voltage | 45 | V |
| Operating Junction Temperature Range | -40 to +125 | °C |
| Thermal Resistance, Junction-to-Ambient | 65 | °C/W |
| Package Type | D²Pak (5 Leads + Tab), TO-263BA |
Key Features
- High Efficiency: Significantly higher efficiency compared to three-terminal linear regulators, especially with higher input voltages.
- Fixed Output Voltage: The LM2575D2T-5R4 provides a fixed output voltage of 5.0 V.
- Current Limiting and Thermal Shutdown: Features cycle-by-cycle current limiting and thermal shutdown for full protection under fault conditions.
- External Shutdown: Includes external shutdown with a typical standby current of 80 uA.
- Low Component Count: Designed to minimize the number of external components, simplifying power supply design.
- Guaranteed Output Voltage Tolerance: 4% tolerance on output voltage within specified input voltages and output load conditions.
Applications
- Simple and High-Efficiency Step-Down (Buck) Regulators: Ideal for applications requiring efficient step-down voltage conversion.
- Efficient Pre-Regulator for Linear Regulators: Can be used as a pre-regulator to improve the overall efficiency of linear regulator-based power supplies.
- On-Card Switching Regulators: Suitable for on-card switching regulator applications where space and efficiency are critical.
- Industrial and Automotive Systems: Can be used in various industrial and automotive systems requiring reliable and efficient power management.
Q & A
- What is the output voltage of the LM2575D2T-5R4?
The output voltage of the LM2575D2T-5R4 is 5.0 V.
- What is the maximum input voltage for the LM2575D2T-5R4?
The maximum input voltage for the LM2575D2T-5R4 is 40 V.
- What is the maximum output current of the LM2575D2T-5R4?
The maximum output current of the LM2575D2T-5R4 is 1.0 A.
- What is the efficiency of the LM2575D2T-5R4 at Vin = 12 V and ILoad = 1.0 A?
The efficiency of the LM2575D2T-5R4 at Vin = 12 V and ILoad = 1.0 A is approximately 77%.
- What is the operating junction temperature range for the LM2575D2T-5R4?
The operating junction temperature range for the LM2575D2T-5R4 is -40°C to +125°C.
- Does the LM2575D2T-5R4 have built-in current limiting and thermal shutdown?
- What is the typical standby current during external shutdown?
The typical standby current during external shutdown is 80 uA.
- What package type is the LM2575D2T-5R4 available in?
The LM2575D2T-5R4 is available in the D²Pak (5 Leads + Tab), TO-263BA package type.
- Why is the LM2575D2T-5R4 more efficient than traditional linear regulators?
The LM2575D2T-5R4 is more efficient because it is a switch-mode power supply, which significantly reduces power dissipation, especially with higher input voltages.
- Can the LM2575D2T-5R4 be used as a pre-regulator for linear regulators?
