DC1793A

Demonstration circuit 1793A is a high voltage inverting charge pump with low noise dual-polarity LDO regulators featuring the LTC®3260EMSE. The LTC3260 operates with an input voltage from 4.5V to 32V. The demo board provides selectable LDO± output set magnitudes of 3.3V, 5V, 12V and 24V for each polarity. Additional LDO± set point jumper selections and optional topside ADJ± resistors allow the user to set other desired LDO± output voltages. The demo board also provides the means to select between Burst Mode® operation or constant-frequency mode operation, plus select an operating frequency of 500KHz, 200KHz, and 50KHz.

• LDO+ output voltage range from 1.2V to 32V (VIN ≥ LDO+ set point + 0.8V)
• LDO- output voltage range from -32V to -1.2V (VOUT ≤ LDO-set point-0.5V)
• Output voltage is -VIN (MODE = 0V), -0.94 • VIN (MODE ≥ 2V)

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