LM2596 3.0 A, Step-Down Switching Regulator The LM2596 regulator is monolithic integrated circuit ideally suited for easy and convenient design of a step down switching regulator (buck converter). It is capable of driving a 3.0 A load with excellent LM2596 Typical Application (Adjustable Output Voltage Version) R1 Feedback 12 V 4 L1 +V 1.0k in R2 LM2596 Unregulated 33 H 3.1k C Output 1 FF DC Input 5.0 V Regulated C in Output 3.0 A Load 2 D1 100 F C out 3OGND 5N/OFF 1N5822 220 F Block Diagram +V in ON/OFF Unregulated 3.1 V Internal ON/OFF DC Input Regulator 1 5 C in Feedback Current Limit R2 Fixed Gain C Error Amplifier FF Comparator 4 Driver Regulated R1 Output Latch Freq L1 V out Shift Output 30 kHz 3.0 Amp 2 1.235 V Switch GND C D1 out Band-Gap 150 kHz Thermal 3 Reset Load Reference Oscillator Shutdown Figure 1. Typical Application and Internal Block Diagram MAXIMUM RATINGS Rating Symbol Value Unit Maximum Supply Voltage V 45 V in ON/OFF Pin Input Voltage 0.3 V V +V V in Output Voltage to Ground (SteadyState) 1.0 V Power Dissipation Case 314B and 314D (TO220, 5Lead) P Internally Limited W D Thermal Resistance, JunctiontoAmbient R 65 C/W JA Thermal Resistance, JunctiontoCase R 5.0 C/W JC 2 Case 936A (D PAK) P Internally Limited W D Thermal Resistance, JunctiontoAmbient R 70 C/W JA Thermal Resistance, JunctiontoCase R 5.0 C/W JC Storage Temperature Range T 65 to +150 C stg Minimum ESD Rating (Human Body Model: C = 100 pF, R = 1.5 k ) 2.0 kV Lead Temperature (Soldering, 10 seconds) 260 C Maximum Junction Temperature T 150 C J Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.