LM2596 DC-DC Buck Converter Step-Down Power Module

Product Description

The LM2596S DC-DC Step Down Adjustable Power Supply Module is a compact and efficient non-isolated buck converter designed to reduce a higher DC input voltage to a lower adjustable output voltage. Based on the LM2596S switching regulator, this module provides a practical solution for powering microcontrollers, sensors, development boards, and other electronic circuits requiring a stable lower voltage.

The module accepts a wide 4.5 V to 40 V DC input and provides an adjustable output from approximately 1.5 V to 35 V. The output voltage can be adjusted using the onboard potentiometer, allowing the module to be configured according to the requirements of the connected circuit.

It supports a rated output current of 2 A, while up to 3 A maximum output current can be achieved under suitable thermal conditions. An additional heatsink is recommended when operating close to the maximum current or power rating.

With a switching frequency of 150 kHz and conversion efficiency of up to approximately 92%, the module offers efficient voltage conversion with relatively low power loss. It also incorporates current-limiting short-circuit protection with automatic recovery.

Its compact size of approximately 43 × 20 × 14 mm makes it suitable for integration into DIY electronics projects, embedded systems, battery-powered equipment, and power-management applications.

Features

• LM2596S-based DC-DC step-down converter
• Adjustable buck converter module
• Wide input voltage range
• Input voltage: 4.5–40 V DC
• Adjustable output voltage: 1.5–35 V DC
• Rated output current: 2 A
• Maximum output current: up to 3 A with suitable cooling
• Conversion efficiency up to approximately 92%
• 150 kHz switching frequency
• Non-isolated step-down design
• Non-synchronous rectification
• Adjustable output using onboard potentiometer
• Short-circuit and current-limit protection
• Automatic recovery after short-circuit protection
• Low-cost and compact power solution
• Suitable for embedded and DIY electronics
• Additional heatsink recommended for high-current operation

Specifications

Parameter	Specification
Module Type	DC-DC Step Down Buck Converter
Regulator IC	LM2596S
Input Voltage	4.5–40 V DC
Output Voltage	Adjustable 1.5–35 V DC
Rated Output Current	2 A
Maximum Output Current	Up to 3 A
Conversion Efficiency	Up to approximately 92%
Switching Frequency	150 kHz
Load Regulation	±0.5%
Voltage Regulation	±0.5%
Dynamic Response	5% in approximately 200 µs
Rectification	Non-Synchronous
Isolation	Non-Isolated
Protection	Current Limiting / Short Circuit
Short-Circuit Recovery	Automatic
Full-Load Temperature Rise	Approximately 40°C
Operating Temperature	-40°C to +85°C at ≤10 W output
Dimensions	Approximately 43 × 20 × 14 mm

Design and Construction

The module features a compact PCB design containing the LM2596S switching regulator, inductive components, capacitors, protection circuitry, and an adjustable potentiometer for output voltage control.

Its small form factor allows it to be installed inside project enclosures or integrated directly into electronic systems. The module is designed as a non-isolated buck converter, meaning the input and output grounds are electrically common.

For higher-current applications, adequate airflow or an additional heatsink should be provided to manage heat generated by the switching regulator.

Working Principle

The LM2596S converts a higher DC input voltage into a lower adjustable DC output voltage using a high-frequency switching buck-conversion process.

The input voltage is rapidly switched at approximately 150 kHz and passed through the switching, inductive, and filtering components. The regulator continuously adjusts the switching operation to maintain the desired output voltage.

The output voltage can be adjusted using the onboard potentiometer. Because the module is a step-down converter, the output voltage must be configured below the applied input voltage.

Output Voltage Adjustment

Before connecting sensitive electronics, measure the output voltage using a suitable multimeter and adjust the onboard potentiometer to the required voltage.

For example, a higher input voltage can be converted to a lower regulated voltage suitable for compatible electronic circuits.

Important: The module cannot increase the input voltage. The output must remain below the input voltage and within the specified 1.5–35 V output range.

Protection

The module includes current-limiting short-circuit protection. If an output short circuit or excessive current condition occurs, the protection mechanism limits the current and can automatically recover when the fault is removed.

Protection does not eliminate the need to operate the module within its voltage, current, and thermal limits.

Thermal Performance

The module is rated for approximately 2 A continuous output current, while up to 3 A may be possible under suitable conditions. Operation near the maximum current generates additional heat, so an external heatsink and adequate airflow are recommended.

For the stated industrial operating temperature range of -40°C to +85°C, the specified output power condition is 10 W or less.

Actual performance depends on input voltage, output voltage, output current, ambient temperature, ventilation, and heatsinking.

Applications

• Arduino power supply
• ESP32 power supply
• Raspberry Pi peripheral power
• Microcontroller projects
• Sensor power supplies
• LED applications
• Battery-powered electronics
• DIY power supplies
• Embedded systems
• Robotics projects
• Automation systems
• Industrial electronics
• Development boards
• Electronic prototypes
• Voltage conversion
• DC power management
• Automotive electronics projects
• Portable electronic devices

Package Includes

• 1 × LM2596S DC-DC Step Down Adjustable Power Supply Module

Product Disclaimer

This is a non-isolated DC-DC step-down converter. The output voltage must be lower than the input voltage and must remain within the specified operating range.

The 2 A rating is the recommended rated output current, while operation up to approximately 3 A requires suitable thermal management. An additional heatsink and adequate airflow are recommended for high-current or high-power operation.

Do not exceed the specified input voltage, output voltage, current, or power limits. Always verify the output voltage with a multimeter before connecting sensitive electronic components.

Actual efficiency, temperature rise, output current capability, and voltage regulation may vary depending on input/output voltage, load, ambient temperature, wiring, and cooling conditions.

Product images are shown for illustrative and representational purposes only. The actual product colour, dimensions, component placement, terminal arrangement, and appearance may vary slightly depending on the manufacturing batch.