ADI have provide "ADP161x TFT LCD Bias Supply" ADISimPower excel file to me simulation?
I have sent the simulation model to your email.
Charge bump is good for applications where output current does not exceed 50mA to 100 mA , as each charge-pump-multiplier stage requires two added series diodes, which contribute to loss from forward voltage drop.
If the negative voltage output is needed, the ADP5070/1 will probably be a good fit. This is a dual channel DC-DC Switching regulator (Boost + inverter) with independent positive and negative outputs, independent resistor programmable output voltage setting on Vpos and Vneg. The downloadable design tool is available at : http://download.analog.com/PMP/ADP507x_Designer.zip
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