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ADM660ARU

CMOS Switched-Capacitor Voltage Converters

Analog Devices 

CMOS Switched-Capacitor

Voltage Converters

ADM660/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 Capacitors

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

APPLICATIONS

Handheld Instruments

Portable Computers

Remote Data Acquisition

Op Amp Power Supplies

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 ϫ 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.

TYPICAL CIRCUIT CONFIGURATIONS

+1.5V TO +7V

INPUT

C1 +

10␮F

FC

V+

ADM660

CAP+

OSC

GND

LV

CAP–

OUT

C2

+10␮F

INVERTED

NEGATIVE

OUTPUT

Voltage Inverter Configuration (ADM660)

C1 +

10␮F

SHUTDOWN

CONTROL

+1.5V TO +7V

INPUT

FC ADM8660 V+

CAP+

GND

LV

CAP–

OUT

SD

C2

+10␮F

INVERTED

NEGATIVE

OUTPUT

Voltage Inverter Configuration with Shutdown (ADM8660)

The ADM660 is a pin compatible upgrade for the MAX660,

MAX665, ICL7660, and LTC1046.

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

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

TSSOP package.

ADM660/ADM8660 Options

Option

ADM660

ADM8660

Inverting Mode

Y

Y

Doubling Mode

Y

N

External Oscillator

Y

N

Shutdown

N

Y

Package Options

R-8

Y

Y

N-8

Y

Y

RU-16

Y

N

REV. B

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reliable. However, no responsibility is assumed by Analog Devices for its

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may result from its use. No license is granted by implication or otherwise

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Tel: 781/329-4700

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Fax: 781/326-8703 © 2002 Analog Devices, Inc. All rights reserved.

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