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 ensured ±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. † Patent Number 5,382,918.
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|Regulated Outputs (#)|
|Vin (Min) (V)|
|Vin (Max) (V)|
|Vout (Min) (V)|
|Vout (Max) (V)|
|Iout (Max) (A)|
|Switching Frequency (Max) (kHz)|
|Switch Current Limit (Typ) (A)|
|Iq (Typ) (mA)|
|Duty Cycle (Max) (%)|
|Vref Accuracy (Typ) (%)|
|Operating Temperature Range (C)|
|Approx. Price (US$)|
|Buck||Buck||Buck||Buck|| Buck |
|None||Adjustable|| Adjustable |
|Enable||Power Good||Enable|| Enable |
Light Load Efficiency
| Adjustable UVLO |
Light Load Efficiency
|SIMPLE SWITCHER||SIMPLE SWITCHER||SIMPLE SWITCHER||SIMPLE SWITCHER||SIMPLE SWITCHER|
|Voltage Mode||Voltage Mode||Voltage Mode||Current Mode||Current Mode|
|-40 to 125||-40 to 125||-40 to 125||-40 to 125||-40 to 125|
| 5DDPAK/TO-263 |
| 7DDPAK/TO-263 |
| 14VSON |
|1.80 | 1ku||2.05 | 1ku||1.85 | 1ku||1.85 | 1ku||1.68 | 1ku|
|Sample & Buy||Sample & Buy||Sample & Buy||Sample & Buy||Sample & Buy|