Detailed introduction to LM2596 electronic component:
Features:
| 3.3V, 5V, 12V, and adjustable output versions | |
| Adjustable version output voltage range, 1.2V to 37V ±4% max over line and load conditions | |
| Available in TO-220 and TO-263 packages | |
| Guaranteed 3A output load current | |
| Input voltage range up to 40V | |
| Requires only 4 external components | |
| Excellent line and load regulation specifications | |
| 150 kHz fixed frequency internal oscillator | |
| TTL shutdown capability | |
| Low power standby mode, IQ typically 80 µA | |
| High efficiency | |
| Uses readily available standard inductors | |
| Thermal shutdown and current limit protection |
Description
The LM2596 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 3A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3V, 5V, 12V, and an adjustable output version.
Requiring a minimum number of external components, these regulators are simple to use and include internal frequency compensation, and a fixed-frequency oscillator.
The LM2596 series operates at a switching frequency of 150 kHz thus allowing smaller sized filter components than what would be needed with lower frequency switching regulators. Available in a standard 5-lead TO-220 package with several different lead bend options, and a 5-lead TO-263 surface mount package.
A standard series of inductors are available from several different manufacturers optimized for use with the LM2596 series. This feature greatly simplifies the design of switch-mode power supplies.
Other features include a guaranteed ±4% tolerance on output voltage under specified input voltage and output load conditions, and ±15% on the oscillator frequency. External shutdown is included, featuring typically 80 µA standby current. Self protection features include a two stage frequency reducing current limit for the output switch and an over temperature shutdown for complete protection under fault conditions.
Applications
| Simple high-efficiency step-down (buck) regulator | |
| On-card switching regulators | |
| Positive to negative converter |