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Part Number: ADM8660

 

MFG: ADI

 

D/C: 09

Description: The ADM660/ADM8660 is a charge-pump voltage converter that can be used to either invert the input supp...


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ADM8660 General 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 ´ 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 F external capacitor is suitable, while with
120 kHz the capacitor may be reduced to 2.2 mF. 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.

ADM8660 Maximum Ratings

Input Voltage (V+ to GND, GND to OUT) . . . . . . . . +7.5 V
LV Input Voltage . . . . . . . . (OUT 0.3 V) to (V+, +0.3 V)
FC and OSC Input Voltage
. . . . . . . . . . . (OUT 0.3 V) or (V+, 6 V) to (V+, +0.3 V)
OUT, V+ Output Current (Continuous) . . . . . . . . . 120 mA
Output Short Circuit Duration to GND . . . . . . . . . . 10 secs
Power Dissipation, N-8 . . . . . . . . . . . . . . . . . . . .  625 mW
(Derate 8.3 mW/°C above +50°C)
qJA, Thermal Impedance . . . . . . . . . . . . . . . . . . . 120°C/W
Power Dissipation R-8 . . . . . . . . . . . . . . . . . . . . . . .450 mW
(Derate 6 mW/°C above +50°C)
qJA, Thermal Impedance . . . . . . . . . . . . . . . . . . . .170°C/W
Power Dissipation RU-16 . . . . . . . . . . . . . . . . . . . .  500 mW
(Derate 6 mW/°C above +50°C)
qJA, Thermal Impedance . . . . . . . . . . . . . . . . . . . .158°C/W
Operating Temperature Range
Industrial (A Version) . . . . . . . . . . . . . . . . 40°C to +85°C
Storage Temperature Range . . . . . . . . . .65°C to +150°C
Lead Temperature Range (Soldering 10 sec) . . . . . . +300°C
Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . . . +215°C
Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . .  +220°C
ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . >2000 V

*This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operation section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

ADM8660 Features

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

ADM8660 Typical Application

Handheld Instruments Portable Computers Remote Data Acquisition Op Amp Power Supplies

ADM8660 Connection Diagram

ADM8660  Connection Diagram

ADM8660 datasheet

ADM8660
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