MAX845ESA Datasheet

Isolated Transformer Driver for PCMCIA Applications


The MAX845ESA provides an isolated power supply small enough to fit in thin PCMCIA cards and space-sensitive applications. It drives a low-profile center-tapped trans- former primary from a 5V or 3.3V DC power supply. The secondary can be wound to provide any isolated posi- tive or negative voltage at powers up to 750mW.The MAX845ESA consists of an oscillator followed by a tog- gle flip-flop. The flip-flop generates two 50% duty-cycle square waves, which are complementary at half the oscillator frequency (450kHz, min). These two signals drive the ground-referenced N-channel power switch- es. Internal circuitry ensures break-before-make action between the two switches. MAX845ESA Features • Transformer Driver for Ultra-Thin 5V-µs Transformers • Isolated DC-to-DC Power Supply for PCMCIA Applications• 450kHz Minimum Switching Frequency• Ultra-Low Input Supply Current Ripple• Single +5V or +3.3V Supply• 5µW Low-Power Shutdown Mode• 8-Pin SO and µMAX Packages• Low Output Ripple Permits Miniature Output Capacitors MAX845ESA Applications • PCMCIA Modem Cards• Isolated Data Acquisition• Isolated Interface Power Supply • Noise-Immunity Communications Interface• Bridging Ground Differences• Medical Equipment• Process Control• Low-Power LAN Networks


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Manufacturer information


Diodes Incorporated is a leading global manufacturer and supplier of high-quality, application-specific, standard products within the broad discrete, logic and analog semiconductor markets. Diodes Incorporated primarily serves the computing, consumer, communications, industrial and automotive segments. Diodes’ diverse product portfolio includes parts for LCD/LED TVs and displays, desktop, notebook and tablet computing, smartphones and hand-held devices, set-top boxes, power supplies and USB protection as well as many other application areas.

Diodes Incorporated offers a wide array of products including diodes, rectifiers, transistors, MOSFETs, gate drivers, protection devices, function-specific arrays, amplifiers and comparators, Hall-effect sensors and temperature sensors, power management devices including LED drivers, AC-DC converters and controllers, DC-DC switching regulators, linear voltage regulators, current monitors, and voltage reference and shunt regulators, along with special function devices including USB power switches, load switch devices, voltage supervisors and motor controllers.

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