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General Description

The MAX845 provides an isolated power supply small enough to fit in thin PCMCIA cards and space-sensitive applications. It drives a low-profile center-tapped transformer primary from a 5V or 3.3V DC power supply. The secondary can be wound to provide any isolated positive or negative voltage at powers up to 750mW.

The MAX845 consists of an oscillator followed by a toggle 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.

A low-power shutdown disables both the switches and the oscillator, reducing power consumption. An evaluation kit (MAX845EVKIT-MM) is available to evaluate low profile 5V 40mA and 5V 100mA applications.

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

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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