Maxim MAX845ESA

Трансформаторный драйвер1,1 мА2,5 В ~ 6 В

Overview

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 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 MAX845ESA 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.

♦ 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

Features

Applications

• SmartPhones
• Portable Navigation Devices
• Portable Media Players
• Portable Systems
• Hand-Held Systems
• Space satellite point of load supply
• Communications payload
• Optical imaging payload
• Desktop PC
• Motherboard