The MAX5033 is a high-voltage step-down DC-DC converter from Texas Instruments. It has a maximum input voltage of 76V and can output 3.3V, 5V, or 12V at up to 500mA.
The MAX5033 is a compact, high‑efficiency step‑down DC‑DC converter that operates from an input voltage of up to 76 V and delivers up to 500 mA of output current. It features internal frequency compensation, a low‑on‑resistance DMOS FET, and protection functions such as undervoltage lockout, cycle‑by‑cycle current limit, short‑circuit protection, and thermal shutdown. The device is offered in fixed‑output (3.3 V, 5 V, 12 V) and adjustable‑output versions and is available in 8‑pin SO and PDIP packages.
Typical performance includes up to 94 % efficiency, a fixed 125 kHz switching frequency, a quiescent current of 270 pA at no load, and a shutdown current of 10 µA. The converter operates over an industrial temperature range of –40 °C to +125 °C, making it suitable for automotive, consumer electronics, and industrial power‑distribution applications.
| Input Voltage Range | 7.5 V to 76 V (fixed versions) / 15 V to 76 V (adjustable version) |
|---|---|
| Output Current | 500 mA |
| Efficiency | Up to 94 % |
| Switching Frequency | 125 kHz (fixed) |
| Quiescent Current (no load) | 270 pA |
| Operating Temperature Range | -40 °C to +125 °C |
| Package Types | 8‑Pin SO and 8‑Pin PDIP |
The MAX5033 can deliver up to 500 mA of output current.
The fixed‑output versions accept 7.5 V to 76 V, while the adjustable version accepts 15 V to 76 V.
The device reaches up to 94 % efficiency at a 24 V input.
It draws only 270 pA of quiescent current when there is no load.