Overview
The LM2574MX-5.0 is a step-down (buck) voltage regulator IC from Texas Instruments, originally developed by National Semiconductor. This device is part of the LM2574 series and is designed to provide a fixed 5.0V output. It is a monolithic integrated circuit that includes all the active functions necessary for a step-down switching regulator, capable of driving a 0.5-A load with excellent line and load regulation. The LM2574MX-5.0 is known for its simplicity, requiring only four external components, and its high efficiency, making it a suitable replacement for traditional three-terminal linear regulators.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Output Voltage (VIN = 12 V, ILOAD = 100 mA) | 4.9 | 5 | 5.1 | V |
| Input Voltage Range | 8 | - | 40 | V |
| Output Current | - | - | 0.5 | A |
| Switching Frequency | - | 52 kHz | - | - |
| Operating Temperature Range | -40 | - | 125 | °C |
| Package Type | - | - | SOIC-14 | - |
Key Features
- Fixed 5.0V output voltage with ±4% tolerance over line and load conditions
- Wide input voltage range: 8V to 40V (up to 60V for HV version)
- Specified 0.5-A output current
- Requires only four external components
- 52-kHz fixed-frequency internal oscillator
- TTL shutdown capability with low-power standby mode
- High efficiency
- Uses readily available standard inductors
- Thermal shutdown and current-limit protection
Applications
- Simple high-efficiency step-down (buck) regulators
- Efficient preregulators for linear regulators
- On-card switching regulators
- Positive-to-negative converters (buck-boost)
- Embedded systems
- Industrial controls
- Consumer electronics
- Telecommunications
- Automotive systems
- General power supplies
Q & A
- What is the output voltage of the LM2574MX-5.0?
The output voltage of the LM2574MX-5.0 is fixed at 5.0V with a ±4% tolerance over line and load conditions. - What is the input voltage range for the LM2574MX-5.0?
The input voltage range for the LM2574MX-5.0 is from 8V to 40V. - How much output current can the LM2574MX-5.0 handle?
The LM2574MX-5.0 can handle up to 0.5A of output current. - What is the switching frequency of the LM2574MX-5.0?
The switching frequency of the LM2574MX-5.0 is fixed at 52 kHz. - What type of package does the LM2574MX-5.0 come in?
The LM2574MX-5.0 comes in a SOIC-14 package. - Does the LM2574MX-5.0 have thermal protection?
Yes, the LM2574MX-5.0 includes thermal shutdown and current-limit protection. - Can the LM2574MX-5.0 be used in high-temperature environments?
Yes, the operating temperature range for the LM2574MX-5.0 is from -40°C to 125°C. - How many external components are required for the LM2574MX-5.0?
The LM2574MX-5.0 requires only four external components. - Is the LM2574MX-5.0 suitable for use in automotive systems?
Yes, the LM2574MX-5.0 is suitable for use in automotive systems among other applications. - Can the LM2574MX-5.0 be used as a preregulator for linear regulators?
Yes, the LM2574MX-5.0 can be used as an efficient preregulator for linear regulators.
