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ADM8660:  CMOS Switched-Capacitor Voltage Converter w/ Low Power Shutdown Pin

Product Details


The ADM660/ADM8660 is a charge-pump voltage converter that can be used to either invert the input supply voltage giving VOUT = -VIN or double it (ADM660 only) giving VOUT = 2 x VIN. Input voltages ranging from +1.5 V to +7 V can be inverted into a negative -1.5 V to -7 V output supply. This inverting scheme is ideal for generating a negative rail in single power supply systems. Only two small external capacitors are needed for the charge pump. Output currents up to 50 mA with greater than 90% efficiency are achievable, while 100 mA achieves greater than 80% efficiency.

A Frequency Control (FC) input pin is used to select either 25 kHz or 120 kHz charge-pump operation. This is used to optimize capacitor size and quiescent current. With 25 kHz selected, a 10 µF external capacitor is suitable, while with 120 kHz the capacitor may be reduced to 2.2 µF. The oscillator frequency on the ADM660 can also be controlled with an external capacitor connected to the OSC input or by driving this input with an external clock. In applications where a higher supply voltage is desired it is possible to use the ADM660 to double the input voltage. With input voltages from 2.5 V to 7 V, output voltages from 5 V to 14 V are achievable with up to 100 mA output current.

The ADM8660 features a low power shutdown (SD) pin instead of the external oscillator (OSC) pin. This can be used to disable the device and reduce the quiescent current to 300 nA.

FEATURES and BENEFITS

  • ADM660: Inverts or Doubles Input Supply Voltage
  • ADM8660: Inverts Input Supply Voltage
  • 100 mA Output Current
  • Shutdown Function (ADM8660)
  • 2.2 µF or 10 µF Capacitors
  • 0.3 V Drop at 30 mA Load
  • +1.5 V to +7 V Supply
  • Low Power CMOS: 600 µA Quiescent Current
  • Selectable Charge Pump Frequency (25 kHz/120 kHz)
  • Pin Compatible Upgrade for MAX660, MAX665, ICL7660
  • Available in 16-Lead TSSOP Package

Functional Block Diagram for ADM8660

Documentation

Title Content Type File Type
ADM660/ADM8660: CMOS Switched-Capacitor Voltage Converters Data Sheet  (Rev C, 04/2011) (pdf, 282 kB) Data Sheets PDF
Voltage Regulators for Power Management
(Analog Dialogue, Vol. 30, No. 4, 1996)
Analog Dialogue HTML
Charge Pumps Products (March 2003)  (pdf, 848 kB) Solutions Bulletins PDF
Charge Pump Application Bulletin  (pdf, 970 kB)
All new applications guide for charge pumps
Overview PDF
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Evaluation Kits & Symbols & Footprints

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Price, packaging, availability

ADM8660 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
ADM8660ANZ Status: Production 8 ld PDIP 8 Comm. Tube, 50 $2.02 $1.92 Y  Material Info PCN Purchase
ADM8660ARZ Status: Production 8 ld SOIC 8 Comm. Tube, 98 $2.02 $1.92 Y  Material Info PCN Purchase
Price Table Help

The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


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