The ICL7660 and ICL7660A are monolithic CMOS power supply circuits that offer unique performance advantages over previously available devices. The ICL7660 performs supply voltage conversions from positive to negative for an input range of +1.5V to +10.0V, resulting in complementary output voltages of -1.5V to -10.0V. The ICL7660A does the same conversions with an input range of +1.5V to +12.0V, resulting in complementary output voltages of -1.5V to -12.0V. Only 2 noncritical external capacitors are needed for the charge pump and charge reservoir functions. The ICL7660 and ICL7660A can also be connected to function as voltage doublers and will generate output voltages up to +18.6V with a +10V input. Contained on the chip are a series DC supply regulator, RC oscillator, voltage level translator, and four output power MOS switches. A unique logic element senses the most negative voltage in the device and ensures that the output N-Channel switch source-substrate junctions are not forward biased. This assures latchup free operation. The oscillator, when unloaded, oscillates at a nominal frequency of 10kHz for an input supply voltage of 5.0V. This frequency can be lowered by the addition of an external capacitor to the “OSC” terminal, or the oscillator may be overdriven by an external clock. The “LV” terminal may be tied to GROUND to bypass the internal series regulator and improve low voltage (LV) operation.
The ICL7660 and ICL7660A are monolithic CMOS voltage‑converter ICs that generate negative supply voltages from a positive input. They require only two non‑critical external capacitors and can also be used as voltage doublers.
The datasheet provides electrical specifications, absolute maximum ratings, pin configurations, typical performance curves, and example application circuits such as negative‑voltage converters, positive‑voltage doublers, and regulated supplies.
| Input voltage range (ICL7660) | +1.5 V to +10.0 V |
|---|---|
| Input voltage range (ICL7660A) | +1.5 V to +12.0 V |
| Output voltage range (ICL7660) | -1.5 V to -10.0 V |
| Output voltage range (ICL7660A) | -1.5 V to -12.0 V |
| Typical power efficiency | 98 % |
| Operating temperature range (ICL7660A) | -40 °C to 85 °C |
The ICL7660 operates with an input voltage from +1.5 V to +10.0 V.
Only two non‑critical external capacitors are needed for the charge pump and reservoir functions.
Typical power efficiency is about 98 %.