LM2599 SIMPLE SWITCHER® Power Converter 150 kHz 3A Step-Down Voltage Regulator, with Features
The LM2599 series provides a monolithic step‑down (buck) switching regulator capable of delivering up to 3 A with excellent line and load regulation. It is offered in fixed 3.3 V, 5 V, 12 V versions and an adjustable version covering 1.2 V to 37 V output.
The device operates at a 150 kHz fixed‑frequency internal oscillator, supports input voltages up to 40 V (45 V absolute maximum), and is supplied in 7‑lead TO‑220 and TO‑263 surface‑mount packages. Features include shutdown/soft‑start control, error‑flag output, low‑power standby mode (≈80 µA), and built‑in protection.
| Switching frequency | 150 kHz |
|---|---|
| Maximum input voltage (absolute max) | 45 V |
| Operating input voltage range | up to 40 V |
| Output current capability | 3 A |
| Package types | 7‑lead TO‑220 and TO‑263 |
| Standby current | ≈80 µA |
The LM2599 operates at a fixed switching frequency of 150 kHz.
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.
It is supplied in a 7‑lead TO‑220 through‑hole package and a 7‑lead TO‑263 surface‑mount package.
The standby (quiescent) current is typically about 80 µA.