Rochester Electronics PMIC - Power Management - Specialized MAX253ESA

The MAX253ESA is a monolithic oscillator and power driver designed for providing isolated power to RS-485 or RS-232 data interfaces. It operates from a single 5V or 3.3V DC power supply and can drive a center-tapped transformer primary, delivering isolated output power levels up to 1W. The device features a CMOS oscillator that drives a pair of N-channel power switches, ensuring a 50% duty cycle through a toggle flip-flop mechanism. Key specifications include a low shutdown current of 0.4¬µA, pin-selectable operating frequencies of 200kHz or 350kHz, and an operating temperature range of -40¬8C to +85¬8C. The MAX253ESA is available in an 8-pin SO package, making it suitable for applications where board space is a concern. It is particularly useful in high noise-immunity communications, isolated power supplies, and medical equipment. Engineers considering this product should note its ability to efficiently manage power in isolated communication systems while maintaining a compact footprint.