MAX1682EUK+T

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MAX1682EUK+T is a highly integrated, low cost, adaptive on-time step-down controller designed for a single-cell Li-ion/Li-polymer battery powered sub-systems. It supports step-down DC/DC (Buck) applications and delivers up to 2 A of continuous output current. The device operates at a fixed switching frequency of 2.25 MHz, which allows the use of small external components.

Applications：

The MAX1682EUK+T is suitable for applications such as battery-powered digital/portable consumer applications like digital cameras, PDAs, and portable audio/GPS/Bluetooth devices. It has a wide input voltage range of 2.6 V to 6.5 V and an output voltage range of 0.4 V to 5.5 V, making it easy to power systems powered by multiple Li-ion or Li-polymer cells.

Working Principle：

The operating principle of the MAX1682EUK+T is as follows. First, the voltage at the input is electrically connected to the storage capacitor, which along with the switch-mode transistors, forms a step-down DC/DC converter. When the power switch is turned off, the inductor current switches off and the voltage across the inductor reverses polarity. This charges the capacitor, storing energy. When the power switch turns on, it functions to keep the output of the converter constant. The operating frequency is determined by an on-chip oscillator, which is externally programmable by an external resistor and capacitor.

The MAX1682EUK+T has excellent power efficiency and includes a number of features to minimize load transients and system power consumption. It includes a soft-start mechanism, adjustable current limit, and an adjustable output voltage allowing the user to select their target voltage. It also incorporates a programmable short-circuit protection feature to safeguard the device from prolonged short circuit conditions.

Conclusion：

The MAX1682EUK+T is an adaptive on-time step-down controller designed for single-cell Li-ion/Li-polymer battery powered sub-systems. It features a wide input voltage range and adjustable current limit, output voltage, and short-circuit protection. It has excellent power efficiency and is suitable for a variety of applications, such as portable consumer electronics.

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