The MAX1889 evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board that contains a step-up switching regulator, a positive three-stage charge-pump and high-voltage positive linear-regulator controller, and a negative three-stage charge-pump and high-voltage negative linear-regulator controller. The step-up switching circuit is configured for a 9V output and provides up to 200mA from a DC supply voltage of 2.7V to 5.5V.
The positive charge-pump and linear regulator are configured for a 20V output using two charge-pump stages providing up to 10mA. The negative charge pump and linear regulator are configured for a -7V output using a single charge-pump stage providing up to 10mA. Power for the positive charge-pump input can be provided by the DC input source or the step-up switching regulator output. Power for the negative charge-pump input can be provided by the DC input source or the power ground.
The MAX1889 EV kit demonstrates low quiescent current and high efficiency (up to 90%) for maximum battery life. The EV kit features overload protection for the input and all outputs. Operation at 1MHz allows the use of tiny surface-mount components. The MAX1889 QFN package (1.0mm max) with low-profile external components allows this circuit to be 1.25mm high.
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