Overview
The LM2574N-5G is a monolithic integrated circuit designed as a step-down switching regulator (buck converter) by onsemi. This device is part of the LM2574 series, which is ideally suited for easy and convenient design of power supply systems. The LM2574N-5G is specifically configured to provide a fixed output voltage of 5.0 V. It is capable of driving a 0.5 A load with excellent line and load regulation, making it highly efficient compared to traditional three-terminal linear regulators, especially at higher input voltages.
The LM2574 series minimizes the number of external components required, simplifying the power supply design. It includes features such as a 52 kHz fixed frequency internal oscillator, TTL shutdown capability, and low power standby mode. The device also includes thermal shutdown and current limit protection for full fault protection.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Output Voltage | 5.0 | V |
| Output Current | 0.5 | A |
| Input Voltage Range | 4.75 to 40 | V |
| Switching Frequency | 52 kHz | kHz |
| Efficiency | Up to 85% | % |
| Output Voltage Tolerance | ±4% | % |
| Oscillator Frequency Tolerance | ±10% (±2% over 0°C to 125°C) | % |
| Standby Quiescent Current | 60 µA (typical) | µA |
| Package Type | PDIP-8 | |
| Thermal Shutdown and Current Limit Protection | Yes |
Key Features
- Fixed output voltage of 5.0 V, with other versions offering 3.3 V, 12 V, 15 V, and adjustable output options.
- Guaranteed 0.5 A output current.
- Wide input voltage range: 4.75 V to 40 V.
- Requires only 4 external components.
- 52 kHz fixed frequency internal oscillator.
- TTL shutdown capability and low power standby mode.
- High efficiency, reducing the need for additional heatsinking.
- Uses readily available standard inductors.
- Thermal shutdown and current limit protection for fault conditions.
Applications
- Simple and high-efficiency step-down (buck) regulators.
- Efficient pre-regulator for linear regulators.
- On-card switching regulators.
- Power supply for battery chargers.
- Positive to negative converters (buck-boost) and negative step-up converters.
Q & A
- What is the output voltage of the LM2574N-5G?
The output voltage of the LM2574N-5G is 5.0 V.
- What is the maximum output current of the LM2574N-5G?
The maximum output current is 0.5 A.
- What is the input voltage range for the LM2574N-5G?
The input voltage range is from 4.75 V to 40 V.
- How many external components are required for the LM2574N-5G?
Only 4 external components are required.
- What is the switching frequency of the LM2574N-5G?
The switching frequency is 52 kHz.
- Does the LM2574N-5G have thermal shutdown and current limit protection?
- What is the efficiency of the LM2574N-5G?
The efficiency can be up to 85%.
- What is the tolerance on the output voltage of the LM2574N-5G?
The output voltage tolerance is ±4%.
- What is the standby quiescent current of the LM2574N-5G?
The standby quiescent current is 60 µA (typical).
- In what package type is the LM2574N-5G available?
The LM2574N-5G is available in a PDIP-8 package.
