MAX686EVKIT

Features of the MAX686EVKIT are:(1)output voltage:+18V typical positive output (or +12.6V to +24V adjustable with up/down),17V typical negative output (or -22.7V to 11.4V adjustable with up/down);(2)battery input voltage:+0.8V to +18V (positive output),+0.8V to +12V (negative output);(3)+2.7V to +5.5V VIN supply range;(4)up to 20mA output current;(5)6-bit DAC-controlled output voltage;(6)internal 0.5A, 28V N-channel switch;(7)1.3A IC shutdown current;(8)up to 300kHz switching frequency;(9)surface-mount components;(10)fully assembled and tested.

The MAX686EVKIT is fully assembled and tested.Follow these steps to verify board operation. VIN and VBATT are separated on each circuit to demonstrate operation of VBATT down to +0.8V. VIN and VBATT can be connected together and to a single supply from +2.7V to +5.5V via jumpers JU3 and JU6. Do not turn on the power supply until all connections are completed.

The MAX686EVKIT contains two separate switchingregulator circuits. The first circuit provides an +18V output for currents up to 20mA with 90% typical conversion efficiency. The second circuit provides a -17V output voltage for currents up to 20mA with 82% typical conversion efficiency. Both output voltages of MAX686EVKIT can be adjusted with the internal 6-bit DAC. Each output can be controlled by logic signals applied to the UP/DN pads.