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ADM660:  CMOS Switched-Capacitor Voltage Converter

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 sing ...More

ADM660:  CMOS Switched-Capacitor Voltage Converter

Product Description

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.

RESOURCES & TOOLS

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  • 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
  • Input Voltage (V): 1.5 - 7
  • Vout Preset (V): -Vin or 2*Vin
  • Iout : 100mA
  • Vout #2 (V): n/a
  • Iout #2 (µA): n/a
  • Vout #3 (V): n/a
  • Iout #3 (µA): n/a
  • Power Efficiency (%): 80%
  • Supply Current : 4.5mA
  • Shutdown Current, max: 5µA
  • Package: DIP/SO/TSSOP

Functional Block Diagram for ADM660

类似产品

arrow View Full Interactive Product Selection Table
Part# Input Voltage (V) Vout Preset (V) Iout Power Efficiency (%) Supply Current Shutdown Current, max Boost Inverter Regulated Output Package Price* (1000-4999)
ADM660 1.5 - 7 -Vin or 2*Vin 100mA 80 4.5mA 5µA Y Y --- DIP/SO/TSSOP $1.82
ADM8660 1.5 - 7 -Vin 100mA 80 4.5mA 5µA --- Y --- DIP/SO/TSSOP $1.92
ADM8828 1.5 - 5.5 -Vin 25mA 99 1mA 2µA --- Y --- 6-Lead SOT 23 $0.76
ADM8829 1.5 - 5.5 -Vin 25mA 99 1mA n/a --- Y --- 6-Lead SOT 23 $0.76
ADM8832 2.6 - 3.6 +5.1/+15.3/-10.3 5mA 90 400µA 1µA Y Y Y LFCSP-20 $2.02
ADM8839 2.6 - 3.6 +5/+15/-15 8mA 82 500µA 5µA Y Y Y LFCSP-20 $1.92
ADP3605 3-6v -3v/adj 120mA n/a 6mA 15µA --- Y Y SOIC-8, TSSOP-14 $1.50
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