TL7660 CMOS Voltage Converter | TI.com

TL7660 (ACTIVE) CMOS Voltage Converter

CMOS Voltage Converter - TL7660
Datasheet
 

Description

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.

Features

  • 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

Parametrics

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Part number Order Vin (Min) (V) Vin (Max) (V) Vout (Min) (V) Vout (Max) (V) Iout (Max) (A) Regulated outputs (#) Switching frequency (Min) (kHz) Switching frequency (Max) (kHz) Iq (Typ) (mA) Operating temperature range (C) Type Rating Package Group
TL7660 Order now 1.5     10     -1.5     -10     0.1     1     3     100     0.11     -40 to 125
-40 to 85    
Converter     Catalog     PDIP | 8
SOIC | 8
VSSOP | 8