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
