TL7660

(1) Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other onditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) Connecting any input terminal to voltages greater than V_CC or less than GND may cause destructive latchup. It is recommended that no inputs from sources operating from external supplies be applied  rior to power up of the TL7660.
(3) Maximum power dissipation is a function of TJ(max), _JA, and T_A. The maximum allowable power dissipation at any allowable ambient
temperature is PD = (T_J(max) T_A)/_JA. Operating at the absolute maximum T_J of 150 can affect reliability.
(4) The package thermal impedance is calculated in accordance with  ESD 51-7.

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 TL7660 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 V_CC = 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 (V_IN < 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 to 85. The TL7660I is characterized for operation over a free-air temperature range of 40 to 125.