The LM2591HV SIMPLE SWITCHER® Power Converter 150 kHz 1A Step-Down Voltage Regulator is a 1A step-down switching regulator from TI. It operates at a switching frequency of 150kHz and includes internal frequency compensation, external shutdown and a typical standby current of 90µA.
The LM2591HV series is a monolithic step‑down (buck) switching regulator capable of delivering up to 1 A with a fixed 150 kHz internal oscillator. It is offered in fixed 3.3 V, 5 V and an adjustable version (1.2 V‑57 V) and is available in 5‑lead TO‑220 and TO‑263 surface‑mount packages. The device includes internal frequency compensation, a low‑power standby mode (≈90 pA), external shutdown, and protection features such as a two‑stage current limit and thermal shutdown.
Typical applications include high‑efficiency buck regulation, pre‑regulation for linear regulators, on‑card switching supplies, and positive‑to‑negative conversion. The datasheet also contains absolute maximum ratings, detailed electrical characteristics, layout guidelines, and mechanical dimensions for both package styles.
| Switching frequency | 150 kHz (fixed) |
|---|---|
| Output current capability | 1 A |
| Input voltage range | 4.5 V to 60 V |
| Fixed output voltages | 3.3 V, 5 V |
| Adjustable output range | 1.2 V to 57 V |
| Standby current (ON/OFF pin) | ≈90 pA |
The regulator uses a fixed internal oscillator at 150 kHz.
The standby current is typically about 90 pA.