MAX5019/MAX5020 are fixed-frequency DC-DC converters that can implement isolated or nonisolated power supplies.
The MAX5019 and MAX5020 integrate all building blocks needed for fixed‑frequency DC‑DC power supplies. They support both isolated and non‑isolated topologies and feature a high‑voltage startup circuit that can operate directly from 18 V to 110 V input. The devices use current‑mode control with leading‑edge blanking and an internally trimmed 275 kHz oscillator, reducing external component count.
MAX5019 is suited for flyback converters with up to 85 % duty cycle, while MAX5020 is intended for single‑ended forward converters limited to less than 50 % duty cycle. Both are offered in an 8‑pin SO package and include protection features such as soft‑start, thermal shutdown, and pulse‑by‑pulse current limiting.
| Input Voltage Range | 18 V to 110 V |
|---|---|
| Oscillator Frequency | 275 kHz ±10 % |
| Maximum Duty Cycle (MAX5019) | 85 % |
| Maximum Duty Cycle (MAX5020) | < 50 % |
The internal oscillator is trimmed to 275 kHz with a tolerance of ±10 %.
The MAX5019 can operate with a duty cycle up to 85 %.
They accept an input voltage from 18 V up to 110 V (or 13 V to 36 V for low‑voltage operation).