The LM2575 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 1A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3V, 5V, 12V, 15V, 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 LM2575 series offers a high-efficiency replacement for popular three-terminal linear regulators. It substantially reduces the size of the heat sink, and in many cases no heat sink is required.
A standard series of inductors optimized for use with the LM2575 are available from several different manufacturers. This feature greatly simplifies the design of switch-mode power supplies.
Other features include a guaranteed ±4% tolerance on output voltage within specified input voltages and o
Product Highlights:
| • | 3.3V, 5V, 12V, 15V, and adjustable output versions |
| • | Adjustable version output voltage range,
1.23V to 37V (57V for HV version) ±4% max over
line and load conditions |
| • | Guaranteed 1A output current |
| • | Wide input voltage range, 40V up to 60V for HV version |
| • | Requires only 4 external components |
| • | 52 kHz fixed frequency internal oscillator |
| • | TTL shutdown capability, low power standby mode |
| • | High efficiency |
| • | Uses readily available standard inductors |
| • | Thermal shutdown and current limit protection |
| • | P + Product Enhancement tested |
Potential Applications:
| • | Simple high-efficiency step-down (buck) regulator |
| • | Efficient pre-regulator for linear regulators |
| • | On-card switching regulators |
| • | Positive to negative converter (Buck-Boost) |