LM2574/LM2574HV SIMPLE SWITCHER™ 0.5A Step-Down Voltage Regulator is a low-power buck converter from TI. It provides 3.3V, 5V, 12V, 15V and adjustable output voltages. It has a high efficiency and low standby current. It is suitable for various applications that need low power.
The LM2574 series are monolithic integrated circuits that implement a step‑down (buck) switching regulator capable of delivering up to 0.5 A. Fixed output versions are available at 3.3 V, 5 V, 12 V and 15 V, while an adjustable version covers 1.23 V to 37 V.
Key features include a 52 kHz fixed‑frequency internal oscillator, TTL shutdown with a typical 50 pA standby current, thermal shutdown, cycle‑by‑cycle current limiting, and the ability to operate with only four external components. The device offers high efficiency (up to 88 %) and can be used with standard inductors, simplifying power‑supply design.
| Output current | 0.5 A |
|---|---|
| Fixed output voltages | 3.3 V, 5 V, 12 V, 15 V |
| Adjustable output range | 1.23 V to 37 V |
| Input voltage range | 40 V (60 V for HV version) |
| Oscillator frequency | 52 kHz |
| Standby shutdown current | 50 pA (typical) |
| External components required | 4 |
Only four external components are required.
The standby shutdown current is typically 50 pA.
The internal oscillator runs at a fixed 52 kHz.