MAX1722ELT+T

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DC-DC switching regulators are small, efficient, and highly reliable devices used to convert a voltage of one level to another level without large losses in the process. The MAX1722ELT+T is a step-up dc-dc switching regulator from Maxim Integrated Products. It is designed to increase the output level of an input source to create a higher output with low power losses.

The MAX1722ELT+T application field includes battery-powered systems and is especially suitable for post-regulation of variable transformer/uninterruptible power supply systems as well as for set-top boxes, DVD players, etc. It is a 7-pin device, with a maximum output current of 500 mA and a maximum output voltage of 17 V.

The working principle of the MAX1722ELT+T is based on the peak-current-mode control circuit. It incorporates an internal oscillator that generates a fixed-frequency square-wave signal. This is known as the "switch frequency" and is usually set at 350 kHz. The switching transistors control the peaks of the current in the output inductor, thus allowing a maximum efficiency of up to 96%. The device automatically achieves an optimized line and load regulation with a minimum of external components.

The MAX1722ELT+T has several features which make it attractive for many applications. These features include auto-shutdown to reduce power wastage, low-dropout voltage for superior efficiency, an adjustable switching frequency for noise minimization and over-voltage protection for system safety.

The MAX1722ELT+T uses two distinct topologies to deliver its output. When on the "high range" mode, it uses an adjustable frequency hysteretic architecture, while on the "low range" mode, it uses a fixed-frequency peak-current-mode architecure. This dual-mode design allows the device to boost power supplies with low input voltage, when needed.

In conclusion, the MAX1722ELT+T is a highly efficient, reliable, and economical dc-dc switching regulator designed to step-up input voltages of up to 17 V. It is capable of providing high power output with low power losses and can be used in numerous battery-powered applications as a post-regulation device. The device also integrates several useful features such as a low-dropout voltage for superior efficiency and auto-shutdown for reduced power wastage.

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