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National Semiconductor LM2599 Simple Switcher Power Converter Datasheet
The LM2599 series provides a monolithic step‑down (buck) regulator with internal 150 kHz fixed‑frequency oscillator, shutdown/soft‑start control, and error‑flag output. It supports up to 3 A load current and offers high efficiency (up to 90 %).
The device is offered in 7‑lead TO‑220 and TO‑263 surface‑mount packages, with a typical standby current of about 80 µA and built‑in protection features such as thermal shutdown and current limiting.
National Semiconductor LM2599 specifications
| Switching frequency | 150 kHz |
|---|---|
| Maximum input voltage (Vin) | 45 V |
| Output current capability | 3 A |
| Typical efficiency (12 V in, 3 A out) | 73 % |
| Typical efficiency (15 V in, 3 A out) | 90 % |
| Standby quiescent current | ≈80 µA |
| Package options | 7‑lead TO‑220 and TO‑263 |
| Available fixed output versions | 3.3 V, 5 V, 12 V |
Source: National Semiconductor LM2599 Simple Switcher Power Converter Datasheet
All National Semiconductor LM2599 documents by type
Ratings, dimensions and ordering codes, for selection and design work.
Questions answered in these manuals
What is the switching frequency of the LM2599?
The LM2599 operates at a fixed internal switching frequency of 150 kHz.
From: National Semiconductor LM2599 Simple Switcher Power Converter Datasheet
What is the maximum input voltage the LM2599 can handle?
The maximum supply voltage (Vin) rating is 45 V.
From: National Semiconductor LM2599 Simple Switcher Power Converter Datasheet
What is the switching frequency of the LM2599?
The LM2599 uses a fixed 150 kHz internal oscillator.
From: National Semiconductor LM2599 Simple Switcher Power Converter Datasheet
What is the maximum continuous output current?
The device is guaranteed to deliver up to 3 A of output current.
From: National Semiconductor LM2599 Simple Switcher Power Converter Datasheet
What is the switching frequency of the LM2599?
The LM2599 operates at a fixed switching frequency of 150 kHz.
From: National Semiconductor LM2599 Step-Down Voltage Regulator Datasheet
What output voltage versions are available?
Fixed output versions of 3.3 V, 5 V, and 12 V are offered, plus an adjustable version covering 1.2 V to 37 V.
From: National Semiconductor LM2599 Step-Down Voltage Regulator Datasheet