HT7660 -- CMOS Switched-Capacitor VoltageConverter General Description HT7660 is a monolithic CMOSswitched-capacitor voltage converter. HT7660 is designed tocomplete a voltage conversion from positive to negative. The onlyrequired external components are two low cost electrolyticcapacitors. HT7660 includes a voltage regulator, an RCoscillator and four output power MOS switches. The frequency of anRC oscillator can be lowered by adding an external capacitorbetween VDD and the OSC pin, or an external clock can beconnected to the OSC pin to replace the original oscillator. The LVterminal may be tied to VSS to disable the voltage regulator. Bydoing this, low voltage operation can be improved. HT7660 Features - HT7660 Simple conversion of VDD to -VDD
- HT7660 Cascade connection (two devices are connected,VOUT= -2VDD)
- HT7660 Boost pin for higher switching frequency
- HT7660 Easy to use
- Requires only two external capacitors - HT7660 No external diode required
- HT7660 Typically with no load voltage conversion, 99.9% efficiency
- HT7660 Typical power efficiency is 98%
- HT7660 Wide operating voltage range: 3V to 12V
- HT7660 8-pin DIP/SOP package
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