MAX845EUA Datasheet PDF - Maxim Integrated

●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