The MAX5033 is an easy-to-use, high-efficiency, high-voltage, step-down DC-DC converter that operates from an input voltage up to 76V and consumes only 270µA quiescent current at no load. It operates as a pulse-width modulated (PWM) converter at a fixed 125kHz switching frequency under heavy loads, and automatically switches to pulse-skipping mode to provide low quiescent current and high efficiency under light loads. The MAX5033 includes internal frequency compensation to simplify circuit implementation. It utilizes an internal low-on-resistance, high-voltage, DMOS transistor to achieve high efficiency and reduce overall system cost. The device incorporates undervoltage lockout, cycle-by-cycle current limit, hiccup-mode output short-circuit protection, and thermal shutdown. The MAX5033 can deliver up to 500mA output current, which may be limited by the package's maximum power dissipation capability. It features external shutdown with a 10µA (typical) shutdown current. The MAX5033A/B/C versions have fixed output voltages of 3.3V, 5V, and 12V, respectively, while the MAX5033D features an adjustable output voltage ranging from 1.25V to 13.2V. The MAX5033 is available in space-saving 8-pin SO and 8-pin plastic DIP packages and operates over the automotive (-40°C to +125°C) temperature range.
The MAX5033 is a compact, high‑efficiency step‑down DC‑DC converter that operates from an input voltage of 7.5 V to 76 V and provides up to 500 mA of output current. It features an internal low‑on‑resistance DMOS FET, pulse‑skipping mode for low quiescent current, and built‑in protections such as undervoltage lockout, current limit, short‑circuit protection, and thermal shutdown.
Key features include a fixed 125 kHz switching frequency, internal frequency compensation, 8‑pin SO and PDIP package options, and a wide operating temperature range from –40 °C to +125 °C, making the device suitable for automotive, industrial, and consumer‑electronics applications.
| Input Voltage Range | 7.5 V to 76 V |
|---|---|
| Output Current | 500 mA |
| Efficiency | Up to 94 % |
| Quiescent Current (no load) | 270 pA |
| Switching Frequency | 125 kHz (fixed) |
| Package Types | 8‑Pin SO and 8‑Pin PDIP |
| Operating Temperature Range | -40 °C to +125 °C |
| Undervoltage Lockout (UVLO) | 5.2 V |
The device can handle an input voltage up to 76 V.
It draws only 270 pA of quiescent current at no load.
The converter can achieve up to 94 % efficiency.
It is offered in 8‑pin SO and 8‑pin PDIP packages.