Overview
The LM2574DW-ADJR2G is a monolithic integrated circuit from ON Semiconductor, designed as a step-down switching regulator (buck converter). This device is ideal for easy and convenient design of high-efficiency power supply systems. It is available in various fixed output voltages (3.3 V, 5.0 V, 12 V, 15 V) and an adjustable output version. The LM2574 series is known for its high efficiency, especially at higher input voltages, and requires only a few external components to operate, simplifying the power supply design process.
Key Specifications
| Characteristic | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Output Voltage (Fixed Versions) | 3.3 V, 5.0 V, 12 V, 15 V | - | - | V |
| Output Voltage (Adjustable Version) | 1.23 | - | 37 | V |
| Output Current | 0.1 A | 0.5 A | 0.5 A | A |
| Input Voltage Range | 4.75 V | - | 40 V | V |
| Oscillator Frequency | 47 kHz | 52 kHz | 58 kHz | kHz |
| Efficiency (Typical) | - | 72% - 88% | - | % |
| Standby Quiescent Current | - | 60 μA | 200 μA | μA |
| Thermal Shutdown | - | - | 150°C | °C |
| Package Type | - | - | SOIC-16W | - |
Key Features
- Guaranteed ±4% tolerance on output voltage within specified input voltages and output load conditions.
- Wide input voltage range: 4.75 V to 40 V.
- Requires only 4 external components.
- 52 kHz fixed frequency internal oscillator.
- TTL shutdown capability with low power standby mode.
- High efficiency, especially at higher input voltages.
- Uses readily available standard inductors.
- Thermal shutdown and cycle-by-cycle current limiting for full protection under 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).
- Negative step-up converters.
Q & A
- What is the LM2574DW-ADJR2G used for? The LM2574DW-ADJR2G is used as a step-down switching regulator (buck converter) for high-efficiency power supply systems.
- What are the available output voltages for the LM2574 series? The LM2574 series is available in fixed output voltages of 3.3 V, 5.0 V, 12 V, 15 V, and an adjustable output version ranging from 1.23 V to 37 V.
- What is the maximum output current of the LM2574? The maximum output current is 0.5 A.
- What is the input voltage range for the LM2574? The input voltage range is from 4.75 V to 40 V.
- What is the oscillator frequency of the LM2574? The oscillator frequency is fixed at 52 kHz.
- Does the LM2574 have thermal protection? Yes, it includes thermal shutdown and cycle-by-cycle current limiting for protection under fault conditions.
- How many external components are required to operate the LM2574? Only 4 external components are required.
- What is the typical efficiency of the LM2574? The typical efficiency ranges from 72% to 88% depending on the input and output conditions.
- Is the LM2574 suitable for high-temperature environments? Yes, it operates within a junction temperature range of -40°C to +125°C.
- What is the standby quiescent current of the LM2574? The standby quiescent current is typically 60 μA.
