Tudi LMC7660IN-TUDI

LMC7660 is a monolithic CMOS power supply circuit offering distinct performance advantages over previous devices. It converts positive input voltages in the range of +1.5V to +10V to corresponding negative voltages of -1.5V to -10V for supply voltage conversion. The charge pump and charge storage functions require only 2 non-critical external capacitors. LMC7660 can also be connected as a voltage multiplier, producing output voltages up to +18.6V with a +10V input. The chip integrates a series DC power supply regulator, RC oscillator, voltage level translator, and four output power MOS switches. A unique logic element detects the most negative voltage in the device, ensuring the output N-channel switch source-to-substrate junction is not forward-biased, thereby guaranteeing latch-up-free operation. When unloaded, the oscillator runs at a nominal frequency of 10kHz with a 5.0V input supply voltage. This frequency can be reduced by adding an external capacitor to the OSC pin, or the oscillator can be driven by an external clock. The LV pin can be connected to ground to bypass the internal series regulator and improve low-voltage (LV) operation. At medium-to-high voltages (+3.5V to +10V), the LV pin should be left floating to prevent device latch-up.

• Simple conversion of +5V logic supply to ±5V supply
• Simple voltage multiplication (VOUT = (-) nVIN)
• Typical open-circuit voltage conversion efficiency 99.9%
• Typical power efficiency 98%
• Wide operating voltage range 1.5V to 10V
• Easy to use, only 2 external non-critical passive components required

• On-board negative supply for DRAM
• Local microprocessor (8080-type) negative supply
• Low-cost negative supply
• Data acquisition systems