The LM2599 is a high performance, high reliability switch-mode power supply with a 150kHz switching frequency and a 3A output current.
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.
| 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 |
The LM2599 operates at a fixed internal switching frequency of 150 kHz.
The maximum supply voltage (Vin) rating is 45 V.
Fixed output versions of 3.3 V, 5 V, 12 V and an adjustable version are available.
The typical efficiency under those conditions is about 73 %.