HT7660 is a monolithicCMOSswitched-capacitor voltage converter. HT7660 is designed to complete a voltage conversion from positive to negative. The only required external components are two low cost electrolytic capacitors.
HT7660 includes a voltage regulator, an RC oscillator and four output power MOS switches.
The frequency of an RC oscillator can be lowered 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 original oscillator. The LV terminal may be tied to VSS to disable the voltage regulator. By doing this, low voltage operation can be improved.
Features:
· Simple conversion of VDD to -VDD· Cascade connection (two devices are connected, VOUT= -2 VDD)· 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
(Absolute) Maximum Ratings:
Supply Voltage ............................-0.3V to 13V Operating Temperature ..............-40℃ to 85℃ Storage Temperature...............-50℃ to 125℃
Note: These are stress ratings only. Stresses exceeding the range specified under "Absolute Maximum Ratings" may cause substantial damage to the device. Functional operation of this device at other conditions beyond those listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliability.
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
