The LM2596 series of regulators are monolithic integrated circuits ideally suited for easy and convenient design of a step-down switching regualtor(buck converter). All circuits of this series are capable of driving a 3.0A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3V, 5.0V,12V, 15V, and an adjustable output version. These regulatiors were designed to minimize the number of externalcomponents to simplify the power supply design.
The LM2596 is a monolithic step‑down (buck) switching regulator capable of delivering a guaranteed 3 A output current. It supports fixed output versions (3.3 V, 5 V, 12 V, 15 V) and an adjustable version with an output range of 1.23 V to 37 V. The device operates from a wide input voltage range (up to 45 V) and features a 150 kHz fixed‑frequency internal oscillator, thermal shutdown, and current‑limit protection.
The datasheet provides absolute maximum ratings, operating ratings, detailed electrical characteristics, typical performance curves, layout guidelines, pin descriptions, and mechanical dimensions for TO‑220, TO‑220V, TO‑263 (D2PAK) and T0263 packages. It also lists the minimal external component count (only four parts) required to build a functional regulator circuit.
| Maximum Output Current | 3.0 A |
|---|---|
| Maximum Input Voltage | 45 V |
| Efficiency (15 V version) | up to 98 % |
| Adjustable Output Voltage Range | 1.23 V – 37 V |
| Switching Frequency | 150 kHz |
| External Component Count | 4 components |
The LM2596 is guaranteed to deliver up to 3 A of output current.
The 15 V version can reach up to 98 % efficiency under the specified test conditions.
The device can tolerate a maximum supply voltage of 45 V.
Only four external components are needed for a functional regulator circuit.