Introduction to LM2596
LM2596 is a switching voltage regulator for step-down power management monolithic integrated circuits, capable of outputting 3A drive current, while having good linearity and load regulation characteristics. The fixed output versions of LM2596 are 3.3V, 5V and 12V, and the adjustable version can output various voltages less than 37V. This is an LM2596 DC-DC buck converter step-down power module with high-precision potentiometer, capable of driving a load up to 3A with high efficiency, which can work with Iteaduino UNO, other mainboards and basic modules. When the output current keeps greater than 2.5A (or output power greater than 10W), please add a heat sink on it. To use the LM2596 CC/CV Voltage Converter as an LED Constant Current Driver: Make sure of the operating current and maximum operating voltage of the LED you will drive. With no load connected to the output of the module (open circuit), adjust the Constant Voltage potentiometer CV to set the output voltage to the LED maximum operating voltage.
- LM2596 is a voltage regulator mainly used to step down the voltage or to drive load under 3A.
- It is also known as DC-to-DC power converter or buck converter which is used to step down the voltage from its input supply to the output load. The current goes up during this voltage step down process.
- LM2596 comes with a remarkable load and line regulation. It is available in both versions: fixed output voltage version with 3.3V, 5V, 12V, and customized output version where you can choose the output as per your requirement.
- This regulator is incorporated with a fixed-frequency oscillator and an internal frequency compensation method.
- Frequency compensation is applied by adjusting both phase and gain characteristics of the open-loop output to avoid oscillation and vibration in the circuit. This is achieved with the help of resistance-capacitance networks.
- A minimum number of external components are required for this regulator that works at a fixed frequency of 150 kHz.
- It is available in surface mount package TO-263 and standard 5-pin package TO-220.
LM2596 Datasheet
Before you use this device for your electrical project, it’s wise to have a look at its datasheet that gives you an overview of the main characteristics of the component.Click below to download the datasheet of LM2596.LM2596 Pinout
The following figure shows the pinout diagram of LM2596.The LM2596 comes with total five pins as follow:Vin = I = this is the input supply pin interlaced with the input bypass capacitor to provide the switching current and to reduce voltage transients.Output = O = this is the internal switch with voltage switches between (Vin – Vsat) and -0.5V. It comes with a duty cycle of Vout/Vin. The PCB copper area attached to this pin is used to minimize the coupling.Ground = this pin is connected to the ground.Feedback = I = this pin identifies the regulated output voltage for the feedback loop.ON/OFF = I = this pin is used to shut down the voltage regulator circuit with input supply current reducing to 80uA. When the voltage on this pin goes below the threshold voltage of 1.3V, it turns on the buck converter. And when the voltage goes above the 1.3V, it turns off the converter. You can get rid of this shutdown feature by attaching the pin to the ground or leaving it open. In both cases, the regulator remains ON.Lm2596 Adjustable Voltage Regulator
LM2596 Features
- Fixed versions i.e. 3.3-V, 5-V, 12-V, and customizable output versions
- Customizable output version with voltage range: 1.2-V to 37-V ±4% maximum over load and line conditions
- Available in two packages including TO-263 and TO-220 packages.
- Can drive load under 3A.
- 40 V is the input voltage range
- 4 external components are needed
- Remarkable load and line regulations
- Internal oscillator with a fixed frequency of 150 kHz
- TTL shutdown capability
- Comes with low power standby mode, commonly 80 μA
- High efficient and readily available
- Protection against thermal shutdown and current
LM2596 Power Ratings
The following table represents the absolute maximum ratings of regulator LM2596.Lm2596 Buck Converter Schematic Layout
| No. | Rating | Value | Unit |
| 1 | Maximum Supply Voltage | 45 | V |
| 2 | SD/SS Input Voltage | 6 | V |
| 3 | Delay Pin Voltage | 1.5 | V |
| 4 | Flag Pin Voltage | 45 | V |
| 5 | Feedback Pin Voltage | 25 | V |
| 6 | Output Voltage to Ground | -1 | V |
| 7 | Storage Temperature | -65 to 150 | C |
- While working with this component, make sure stresses don’t exceed the absolute maximum ratings, else they can permanently damage the component.
- Plus, if stresses are applied for more than the required time, they can affect device reliability.
LM2596 Applications
Lm2596 Adj Circuit
- Used to step down voltage
- Can drive load under 3A
- Provide remarkable load and line regulation
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