Additional Negative Output with TPS601xx
In addition to a main positive supply voltage, some applications also require a negative voltage at low current. The power-supply circuit should easily be able to provide the application with this additional supply voltage. This note discusses a simple way to derive a negative voltage from a charge pump dc/dc converter. An easy solution to stabilize the negative voltage is to use a shunt regulator. The regulated negative output can be adjusted from -Vref to -3 V, where Vref is typically 1.24 V.. The application describes a solution for biasing a LC-Display with -2 V at 1 mA.
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