MAX1970EEE+T

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A voltage regulator is an electrical regulator designed to keep a steady voltage level between the output of an AC or DC power supply, and the device being powered. A MAX1970EEE+T, is an extremely efficient, low quiescent current, step-up DC-DC converter optimized for high output current applications. Over-load and over-temperature protection enhance system reliability and ensure a stable output voltage over a wide temperature range.

The MAX1970EEE+T consists of a DC-DC step-up controller and power switch, which combined with an external inductor, transform a voltage from the input source, to a higher one at the output. Its size and low power dissipation allows it to be used in various mobile and portable applications.

The MAX1970EEE+T application field includes consumer, handheld, and portable electronics, such as USB powered hubs and external device chargers, personal media players, cellular phone handsets, MP3 players, and PDAs. The device is also useful for embedded applications, such as industrial, medical, and military systems. The MAX1970EEE+T works with a wide range of input voltages, between the input rails of 2.7 V to 5.5 V. The device\'s output voltage is adjustable up to 5.5 V and features a short-circuit protection.

The MAX1970EEE+T working principle is based on a power switch and step-up converter, which includes an inductor, a controller, an output capacitor, and a Zener diode for over-voltage protection. The power switching is controlled by the controller, which allows for an output voltage to be set independently from the input voltage. The series inductor works in agreement with the power switch to form the switch mode power converter. The inductor and power switch current provide the transfer of energy from the input voltage to a higher output voltage, while the controller senses and regulates the output voltage.

When the current provided by the power switch reaches a predetermined level, the controller switch the power switch off, acting as a current limit for the output current of the device. Then the inductor\'s energy is stored in the output capacitor and the output voltage is regulated. In order to prevent current from flowing back from the output to the input, the controller also turns off the power switch momentarily when the inductor current drops below a predetermined level. Thus, the inductor can be used to store energy from the input, and transfer it with the power switch to the output.

The MAX1970EEE+T step-up DC-DC converter combines the high efficiency of the synchronous boost circuit, with the low quiescent current of the linear regulator, in one very small integrated circuit. The small size, low power dissipation, wide input voltage range, and adjustable output voltage, makes the MAX1970EEE+T an ideal solution for portable and mobile applications.

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