Description
1. General Description
The LM2596 Buck Converter Step-Down Module is a versatile, efficient, and easy-to-use DC-DC voltage regulator that
can step down voltage from a higher input to a lower output level. It is widely used in power management applications,
such as powering microcontrollers, sensors, or other low-voltage devices from a higher voltage source.
2. Features
- Input Voltage Range: 4.5V to 40V DC
- Output Voltage Range: 1.25V to 35V DC (adjustable via multi-turn potentiometer)
- Output Current: Up to 3A (maximum)
- Efficiency: Up to 92% (depending on input and output voltage)
- Switching Frequency: 150 kHz (fixed)
- Short-Circuit Protection
- Thermal Shutdown
- Overload Protection
- Dimensions: 45mm x 20mm x 14mm (L x W x H)
- Weight: Approx. 15 grams
- Operating Temperature Range: -40°C to +85°C
3. Pin Configuration and Functions
| Pin Number | Name | Description |
|---|---|---|
| 1 | VIN | Input voltage (4.5V to 40V DC) |
| 2 | VOUT | Output voltage (1.25V to 35V DC) |
| 3 | GND | Ground (0V) |
| 4 | ADJ | Voltage adjustment (connected to a multi-turn potentiometer) |
4. Electrical Characteristics
| Parameter | Symbol | Min | Typ | Max | Units | Conditions |
|---|---|---|---|---|---|---|
| Input Voltage | VIN | 4.5V | 12V | 40V | V | |
| Output Voltage Range | VOUT | 1.25V | – | 35V | V | Adjustable via potentiometer |
| Output Current | IOUT | – | 2A | 3A | A | Max load, depends on input voltage |
| Efficiency | η | 70%</ | 85%</ | 92% | % | VIN = 12V, VOUT = 5V, IOUT = 2A |
| Switching Frequency | fSW | 130 kHz | 150 kHz | 180 kHz | kHz | |
| Quiescent Current | IQ | – | 5 mA | 10 mA | mA | No load |
| Line Regulation | – | 0.5% | 0.8% | 1.0% | %/V | VIN = 4.5V to 40V, IOUT = 0.5A |
| Load Regulation | – | 0.5% | 1.0% | 1.5% | % | IOUT = 0.5A to 3A |
| Temperature Stability | – | 0.5% | – | 1.0% | %/°C | -40°C to +85°C |
6. Thermal Management
The LM2596 module includes thermal shutdown to prevent overheating. Ensure adequate ventilation or a heat sink
if operating at high currents or in a warm environment.
7. Applications
- Battery-powered devices
- Microcontroller power supply
- LED drivers
- Solar panel voltage regulation
- General-purpose DC-DC step-down converters
9. Mechanical Dimensions
| Dimension | Value |
|---|---|
| Length | 45 mm |
| Width | 20 mm |
| Height | 14 mm |
| Weight | 15 g |
10. Package Information
- Package Type: Standard module with pin headers
- Pin Pitch: 2.54mm (standard breadboard-compatible)
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