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HT7660 Datasheet(PDF) 1 Page - Holtek Semiconductor Inc |
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HT7660 Datasheet(HTML) 1 Page - Holtek Semiconductor Inc |
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1 / 9 page  HT7660 CMOS Switched-Capacitor Voltage Converter Block Diagram 1 November 30, 1999 Features · Simple conversion of VDD to -VDD · Cascade connection (two devices are connected, VOUT= -2VDD) · Boost pin for higher switching frequency · Easy to use - Requires only two external capacitors · No external diode required · Typically with no load voltage conversion, 99.9% efficiency · Typical power efficiency is 98% · Wide operating voltage range: 3V to 12V Applications · RS-232 power supply · On board negative supply for dynamic RAMS · Supply voltage splitter, VO= ± VDD/2 · Operation amplifier supply · Data acquisition systems · Positive voltage doubler General Description HT7660 is a monolithic CMOS switched-capaci- tor voltage converter. HT7660 is designed to complete a voltage conversion from positive to negative. The only required external compo- nents are two low cost electrolytic capacitors. HT7660 includes a voltage regulator, an RC os- cillator and four output power MOS switches. The frequency of an RC oscillator can be low- ered by adding an external capacitor between VDD and the OSC pin, or an external clock can be connected to the OSC pin to replace the origi- nal oscillator. The LV terminal may be tied to VSS to disable the voltage regulator. By doing this, low voltage operation can be improved. Voltage Regulator Voltage Level Shifter RC Oscillator Logic Network OSC BOOST LV VSS VDD CAP+ CAP VOUT |
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