The LM2576-ADJ is a monolithic integrated circuit that provides all the active functions for a step-down (buck) switching regulator. This device features an output voltage that is adjustable from driving a 3A load with excellent line and load regulation. Requiring a minimum number of external components, this regulator is simple to use and includes internal frequency compensation and a fixed-frequency oscillator.
The LM2576-ADJ offers a high-efficiency replacement for popular three-terminal adjustable linear regulators. It substantially reduces the size of the heat sink, and in many cases, no heat sink is required. A standard of inductors is available from several different manufacturers optimized for use with the LM2576- ADJ. This feature greatly simplifies the design of switch-mode power supplies.
LM2576 Pinout
LM2576 Pin Configuration
| Pin No | Pin Name | Description |
|---|---|---|
| 1 | Vin | Input Voltage Pin |
| 2 | OUT | Output Pin |
| 3 | GND | GND |
| 4 | FB | Feedback Pin |
| 5 | ON’/OFF | Complement ON/Off Pin |
LM2576 Key Features
- Adjustable output, reference voltage +2% max over
- line and load conditions
- Guaranteed 3A output current
- Wide input voltage range, 4V to 40V
- Wide output voltage range, 1.23V to 37V
- Requires only 6 external components
- 52 kHz fixed frequency internal oscillator
- Low power standby mode, lo typically<200 A
- Efficiency typically over 80%
- Uses readily available standard inductors
Application
- Simple high-efficiency step-down (buck) regulator
- Efficient pre-regulator for linear regulators
- On-card switching regulators
- Positive to negative converter (lnverting Buck-Boost)
- Isolated Flyback Converter using minimum number often external components
You can download this datasheet for LM2576 Adjustable 3A Step-Down Voltage Regulator from the link given below:
