icl7660a pdf

The Intersil ICL7660 and ICL7660A are monolithic CMOSpower supply circuits which offer unique performanceadvantages over previously available devices. The ICL7660performs supply voltage conversions from posiTIve tonegaTIve for an input range of +1.5V to +10.0V resulTIng incomplementary output voltages of -1.5V to -10.0V and theICL7660A does the same conversions with an input range of+1.5V to +12.0V resulTIng in complementary output voltagesof -1.5V to -12.0V. Only 2 noncritical external capacitors areneeded for the charge pump and charge reservoir functions.The ICL7660 and ICL7660A can also be connected tofunction as voltage doublers and will generate outputvoltages up to +18.6V with a +10V input.Contained on the chip are a series DC supply regulator, RCoscillator, voltage level translator, and four output powerMOS switches. A unique logic element senses the mostnegative voltage in the device and ensures that the output N-Channel switch source-substrate junctions are not forwardbiased. This assures latchup free operation.The oscillator, when unloaded, oscillates at a nominalfrequency of 10kHz for an input supply voltage of 5.0V. Thisfrequency can be lowered by the addition of an externalcapacitor to the “OSC” terminal, or the oscillator may beoverdriven by an external clock.The “LV” terminal may be tied to GROUND to bypass theinternal series regulator and improve low voltage (LV)operation. At medium to high voltages (+3.5V to +10.0V forthe ICL7660 and +3.5V to +12.0V for the ICL7660A), the LVpin is left floating to prevent device latchup. 负电压产生器件,也叫电荷泵式变换器,将输入电压+1.5到12伏的电压转换为-1.5到-12伏的电压输出