AD Analog Devices ADM8660 Data Sheet Manual

CMOS Switched-Capacitor Voltage Converters ADM660/ADM8660 FEATURES TYPICAL CIRCUIT CONFIGURATIONS

ADM660: Inverts or Doubles Input Supply Voltage

+1.5V TO +7V

ADM8660: Inverts Input Supply Voltage

INPUT

100 m A Output Current Shutdown Function (ADM8660)

FC V+

2.2
F or 10
F Capacitors ADM660

CAP+ OSC

0.3 V Drop at 30 m A Load

+1.5 V to +7 V Supply 10
F GND LV

Low Power CMOS: 600
A Quiescent Current INVERTED CAP– OUT NEGATIVE

Selectable Charge Pump Frequency (25 k Hz/120 k Hz) C2 OUTPUT

Pin Compatible Upgrade for MAX660, MAX665, ICL7660 Available in 16-Lead TSSOP Package

Voltage Inverter Configuration (ADM660)

APPLICATIONS Handheld Instruments +1.5V TO +7V

INPUT

Portable Computers Remote Data Acquisition FC V+

ADM8660

Op Amp Power Supplies

C1 LV

10
F INVERTED

GENERAL DESCRIPTION OUT NEGATIVE

C2 OUTPUT

The ADM660/ADM8660 is a charge-pump voltage converter

SDSHUTDOWN 10
F

CONTROL

that can be used to either invert the input supply voltage giving VOUT = –VIN or double it (ADM660 only) giving VOUT = 2
VIN.

Voltage Inverter Configuration with Shutdown (ADM8660)

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 www BDTIC.com/ADI is ideal for generating a negative rail in single power supply The ADM660 is a pin compatible upgrade for the MAX660,

systems. Only two small external capacitors are needed for the MAX665, ICL7660, and LTC1046. charge pump. Output currents up to 50 m A with greater than

The ADM660/ADM8660 is available in 8-lead DIP and

90% efficiency are achievable, while 100 m A achieves greater

narrow-body SOIC. The ADM660 is also available in a 16-lead

than 80% efficiency.

TSSOP package.

A Frequency Control (FC) input pin is used to select either 25 k Hz or 120 k Hz charge-pump operation. This is used to ADM660/ADM8660 Options optimize capacitor size and quiescent current. With 25 k Hz

Option ADM660 ADM8660

selected, a 10 µF external capacitor is suitable, while with 120 k Hz the capacitor may be reduced to 2.2 µF. The oscillator frequency

Inverting Mode

on the ADM660 can also be controlled with an external capacitor

Doubling Mode

connected to the OSC input or by driving this input with an

External Oscillator

external clock. In applications where a higher supply voltage is

Shutdown

desired it is possible to use the ADM660 to double the input

Package Options

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 m A output current.

N-8 The ADM8660 features a low power shutdown (SD) pin instead RU-16

of the external oscillator (OSC) pin. This can be used to disable the device and reduce the quiescent current to 300 n A.

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