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Product details

Parameters

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 Type Converter Rating Catalog open-in-new Find other Charge pumps (inductorless)

Package | Pins | Size

PDIP (P) 8 93 mm² 9.81 x 9.43 SOIC (D) 8 19 mm² 3.91 x 4.9 VSSOP (DGK) 8 15 mm² 3 x 4.9 open-in-new Find other Charge pumps (inductorless)

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

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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.

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Technical documentation

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Type Title Date
* Datasheet TL7660 datasheet Jun. 01, 2006
Selection guides Power Management Guide 2018 (Rev. R) Jun. 25, 2018
Technical articles Painting a picture for powering high-performance FPGAs Sep. 05, 2013
Technical articles Analog Applications Spotlight: Mark Pieper Jun. 06, 2013
Technical articles How to choose an LDO or switching regulator May 08, 2013
Technical articles Engineer It Video Series: Testing Power Supplies Mar. 26, 2013

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Reference designs

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CAD/CAE symbols

Package Pins Download
PDIP (P) 8 View options
SOIC (D) 8 View options
VSSOP (DGK) 8 View options

Ordering & quality

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