Description
Product Overview
The LM2596S-ADJ Adjustable DC-DC Buck Converter Module is a high-performance step-down switching regulator based on the industry-standard LM2596S-ADJ chip from Texas Instruments . This versatile module efficiently converts higher DC voltages (from 7V to 35V) into a lower, continuously adjustable output voltage ranging from 1.25V to 30V, making it an essential tool for powering a wide variety of electronic devices.
Unlike traditional linear voltage regulators that dissipate excess energy as heat, this switching regulator uses Pulse Width Modulation (PWM) technology at a fixed 150kHz switching frequency to achieve conversion efficiencies of up to 92% . This means it runs much cooler and wastes significantly less power, making it ideal for battery-powered or enclosed applications. The module is capable of delivering up to 3A of continuous output current, enough to power an Arduino, Raspberry Pi, high-power LED strips, or other 5V/12V logic systems.
The module features a simple three-terminal interface and an onboard precision potentiometer for adjusting the output voltage. This makes it a favorite among electronics hobbyists, educators, and professionals for creating custom power supplies, retrofitting old electronics, and developing IoT devices. The fixed 150kHz oscillator frequency allows for smaller-sized filter components than what would be needed with lower frequency switching regulators .
Key Features
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Adjustable Output Voltage: Continuously adjustable output from 1.25V to 30V via an onboard precision potentiometer, allowing you to set exactly the voltage your project needs
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High-Efficiency Step-Down Conversion: Utilizes the LM2596S-ADJ switching regulator to achieve up to 92% efficiency, minimizing power loss and heat generation compared to linear regulators
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Wide Input Voltage Range: Accepts DC input from 7V to 35V (chip supports up to 40V), making it compatible with common 12V automotive, 24V industrial, and other higher voltage systems
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3A High Output Current: Capable of delivering up to 3A of output current. For loads above 2A, a heatsink is recommended to maintain optimal performance
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Fixed 150kHz Switching Frequency: Operates at a fixed 150kHz internal oscillator, allowing for smaller-sized filter components and lower output ripple
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Excellent Regulation: Features ±4% maximum output voltage tolerance over line and load conditions, ensuring stable power delivery
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Built-in Protection: Includes thermal shutdown and current limit protection (maximum switch current 7.5A) to safeguard the module and your connected devices under fault conditions
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Low Power Standby Mode: Features TTL shutdown capability with typically 80µA standby current consumption
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Requires Only 4 External Components: Simple design with minimal external components, making the module compact and reliable
Technical Specifications
| Parameter | Operating Value |
|---|---|
| Input Voltage | DC 7V – 35V (Chip: 4.5V – 40V) |
| Output Voltage | DC 1.25V – 30V (Continuously adjustable) |
| Output Current | 3A (Max), 2A – 2.5A Recommended |
| Switching Frequency | 150 kHz ±15% |
| Conversion Efficiency | Up to 92% |
| Output Voltage Tolerance | ±4% max over line and load conditions |
| Standby Current | 80µA typical |
| Protection Features | Thermal Shutdown, Current Limit (7.5A max switch current) |
| Operating Temperature | -40°C to +85°C |
| Module Dimensions | Approx. 48mm × 23mm × 14mm |
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