FEATURES

· Simple Voltage Conversion, Including

– Negative Converter

– Voltage Doubler

· Wide Operating Range¼1.5 V to 10 V

· Requires Only Two External (Noncritical)

Capacitors

· No External Diode Over Full Temperature and

Voltage Range

· Typical Open-Circuit Voltage Conversion

Efficiency¼99.9%

· Typical Power Efficiency¼98%

· Full Testing at 3 V

APPLICATIONS

· On-Board Negative Supplies

· Data-Acquisition Systems

· Portable Electronics

DESCRIPTION/ORDERING INFORMATION

The TL7660 is a CMOS switched-capacitor voltage converter that perform supply-voltage conversions from

positive to negative. With only two noncritical external capacitors needed for the charge pump and charge

reservoir functions, an input voltage within the range from 1.5 V to 10 V is converted to a complementary

negative output voltage of –1.5 V to –10 V. The device can also be connected as a voltage doubler to generate

output voltages up to 18.6 V with a 10-V input.

The basic building blocks of the IC include a linear regulator, an RC oscillator, a voltage-level translator, and four

power MOS switches. To ensure latch-up-free operation, the circuitry automatically senses the most negative

voltage in the device and ensures that the N-channel switch source-substrate junctions are not forward biased.

The oscillator frequency runs at a nominal 10 kHz (for VCC = 5 V), but that frequency can be decreased by

adding an external capacitor to the oscillator (OSC) terminal or increased by overdriving OSC with an external

clock.

For low-voltage operation (VIN < 3.5 V), LV should be tied to GND to bypass the internal series regulator. Above

3.5 V, LV should be left floating to prevent device latchup.

The TL7660C is characterized for operation over a free-air temperature range of –40°C to 85°C. The TL7660I is

characterized for operation over a free-air temperature range of –40°C to 125°C.