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LM2576 Series Datasheet

LM2576

3-A Step-Down Voltage Regulator

The LM2576 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving 3-A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3 V, 5 V, 12 V, 15 V, and an adjustable output version.Other features include a ±4% tolerance on output voltage within specified input voltages and output load conditions, and ±10% on the oscillator frequency.

LM2576 Data sheet.pdf

LM2576 Pin Configuration and Function

Pin Number	Pin Name	Description
1	VIN	Supply input pin to collector pin of high-side transistor. Connect to power supply and input bypass capacitors CIN. Path from VIN pin to high-frequency bypass CIN and GND must be as short as possible.
2	Output	Emitter pin of the power transistor. This is a switching node. Attach this pin to an inductor and the cathode of the external diode.
3	Ground	Ground pin. Path to CIN must be as short as possible.
4	Feedback	Feedback sense input pin. Connect to the midpoint of feedback divider to set VOUT for ADJ version or connect this pin directly to the output capacitor for a fixed output version.
5	ON/OFF	Enable input to the voltage regulator. High = OFF and low = ON. Connect to GND to enable the voltage regulator. Do not leave this pin float.