The ISL6211 is a single output power controller that powers Transmeta's Crusoe™ CPU core. The ISL6211 includes a 5-bit digital-to-analog converter (DAC) that adjusts the core PWM output voltage from 0.6VDC to 1.75VDC. This DAC setting may change during operation. Special measures have been taken to allow such a transition to control the slew rate, in line with Transmeta's Longrun™ technology. An accurate reference and proprietary architecture provide excellent comprehensive compensation for static and dynamic core voltage regulation. At rated current, the controller operates at a selectable frequency of 300kHz or 600kHz. When the filter inductor current becomes discontinuous, the controller operates in a hysteretic mode, which greatly improves the efficiency of the system. The hysteretic mode of operation can be inhibited by the specified control pin. The ISL6211 monitors the output voltage. A power good soft start is signaled when the soft start is complete and the output is in regulation. A built-in overvoltage protection prevents seeing the output with a load voltage higher than 1.9V. The undervoltage protection latches the chip off when the output drops below 75% of the set value. The PWM controller's overcurrent circuit monitors the converter's load by sensing the voltage drop on the lower MOSFET. The overcurrent threshold is set by an external resistor. If accurate overcurrent protection is required, an external current sense resistor can optionally be used.