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National Semiconductor LM2576/LM2576HV Simple Switcher 3A Step-Down Voltage Regulator Datasheet
The LM2576 series are monolithic integrated circuits that deliver a high‑efficiency 3 A step‑down (buck) regulator. They require only four external components and include internal frequency compensation, a fixed‑frequency 52 kHz oscillator, and built‑in shutdown and thermal protection.
The device is offered in fixed output versions of 3.3 V, 5 V, 12 V, 15 V and an adjustable version, with a wide input voltage range of 40 V (up to 60 V for the HV version). Typical efficiency reaches 75 % at 12 V input and 3 A load.
National Semiconductor LM2576HV specifications
| Output voltage options | 3.3 V, 5 V, 12 V, 15 V, adjustable |
|---|---|
| Fixed switching frequency | 52 kHz |
| Maximum output current | 3 A |
| Input voltage range | 40 V – 60 V (HV version) |
| Standby current (shutdown) | ≈50 µA typical |
| External components required | 4 |
Source: National Semiconductor LM2576/LM2576HV Simple Switcher 3A Step-Down Voltage Regulator Datasheet
All National Semiconductor LM2576HV documents by type
Ratings, dimensions and ordering codes, for selection and design work.
Questions answered in these manuals
What is the fixed switching frequency of the LM2576?
The regulator uses a 52 kHz fixed‑frequency internal oscillator.
From: National Semiconductor LM2576/LM2576HV Simple Switcher 3A Step-Down Voltage Regulator Datasheet
How many external components are needed to build a basic LM2576 circuit?
Only four external components are required.
From: National Semiconductor LM2576/LM2576HV Simple Switcher 3A Step-Down Voltage Regulator Datasheet