Maxim Integrated Products Debuts the MAX5019 and MAX5020 Controllers

Maxim Integrated Products (Sunnyvale, CA) announced the new MAX5019 and MAX5020 current-mode PWM controllers with an integrated startup circuit. The devices integrate all the building blocks necessary for implementing dc/dc fixed-frequency power supplies. Either primary- or secondary-side regulation may be used to implement isolated or nonisolated power supplies. The devices are suitable for use in telecommunications- and industrial-voltage-range power supplies.

The MAX5019 allows 85-percent operating duty cycle, and can be used to implement flyback converters. The MAX5020 limits the operating duty cycle to less than 50 percent, and can be used in single-ended forward converters. A high-voltage startup circuit allows these devices to draw power directly from the 18V to 110V input supply during startup. The switching frequency is internally trimmed to 275kHz, +/-10 percent.

The MAX5019/20 feature current-mode control, leading-edge blanking and soft-start. They have a high-voltage startup circuit, pulse-by-pulse current limiting and thermal shutdown. Both are available in eight-pin SO packages.