The ADM660/ADM8660 is a charge-pump voltage converterthat can be used to either invert the input supply voltage givingVOUT = –VIN or double it (ADM660 only) giving VOUT = 2 VIN.Input voltages ranging from +1.5 V to +7 V can be inverted intoa negative –1.5 V to –7 V output supply. This inverting schemeis ideal for generating a negative rail in single power supplysystems. Only two small external capacitors are needed for thecharge pump. Output currents up to 50 mA with greater than90% efficiency are achievable, while 100 mA achieves greaterthan 80% efficiency.
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