TL7660 Texas instruments

TL7660

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TL7660

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Описание

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.

Simple Voltage Conversion, Including
- Negative Converter
- Voltage Doubler
Wide Operating Range. . .1.5 V to 10 V
Requires Only Two External (Noncritical) Capacitors
No External Diode Over Full Temperature and Voltage Range
Typical Open-Circuit Voltage Conversion Efficiency. . .99.9%
Typical Power Efficiency. . .98%
Full Testing at 3 V
APPLICATIONS
- On-Board Negative Supplies
- Data-Acquisition Systems
- Portable Electronics

Vin (min) (V)	1.5
Vin (max) (V)	10
Vout (min) (V)	-1.5
Vout (max) (V)	-10
Iout (max) (A)	0.1
Regulated outputs (#)	1
Switching frequency (min) (kHz)	3
Switching frequency (max) (kHz)	100
Iq (typ) (mA)	0.11
Operating temperature range (°C)	-40 to 125, -40 to 85
Rating	Catalog
Type	Converter