Analog Devices ADM660 Datasheet

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
V

= –VIN or double it (ADM660 only) giving V

OUT

= 2 ⫻ VIN.

OUT

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
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.

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.
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

Option ADM660 ADM8660

Inverting Mode Y Y

Doubling Mode Y N

External Oscillator Y N

Shutdown N Y

Package Options

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

OSC

OUT

V+

LV

+

C2
10␮F

INVERTED
NEGATIVE
OUTPUT

10␮F

FC

ADM660

+

C1

CAP+

GND

CAP–

Voltage Inverter Configuration (ADM660)

+1.5V TO +7V

INPUT

OUT

V+

LV

+

C2
10␮F

INVERTED
NEGATIVE
OUTPUT

+

C1

10␮F

SHUTDOWN

CONTROL

FC

CAP+

GND

CAP–

SD

ADM8660

ADM660/ADM8660 Options

R-8 Y Y
N-8 Y Y
RU-16 Y N

REV. B

Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective companies.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: [phone] www.analog.com

Fax: [phone] © 2002 Analog Devices, Inc. All rights reserved.

ADM660/ADM8660–SPECIFICATIONS

(V+ = +5 V, C1, C2 = 10␮F,* TA = T
otherwise noted.)

MIN

to T

MAX

, unless

Parameter Min Typ Max Unit Test Conditions/Comments

Input Voltage, V+ R

= 1 kW

L

3.5 7.0 V Inverting Mode, LV = Open

1.5 7.0 V Inverting Mode, LV = GND

2.5 7.0 V Doubling Mode, LV = OUT

Supply Current No Load

0.6 1 mA FC = Open (ADM660), GND (ADM8660)

2.5 4.5 mA FC = V+, LV = Open

Output Current 100 mA
Output Resistance (ADM660) 9 15 W I
Output Resistance (ADM8660) 9 15 W I

= 100 mA

L

= 100 mA, TA = 25∞C

L

Output Resistance (ADM8660) 16.5 W IL = 100 mA, TA = –40∞C to +85∞C

Charge-Pump Frequency 25 kHz FC = Open (ADM660), GND (ADM8660)

120 kHz FC = V+

OSC Input Current ± 5 mAFC = Open (ADM660), GND (ADM8660)

± 25 mAFC = V+

Power Efficiency (FC = Open) (ADM660) 90 94 % R
Power Efficiency (FC = Open) (ADM8660) 90 94 % R

Power Efficiency (FC = Open) (ADM8660) 88.5 % R

= 1 kW Connected from V+ to OUT

L

= 1 kW Connected from V+ to OUT,

L

T

= +25∞C

A

= 1 kW Connected from V+ to OUT,

L

TA = –40∞C to +85∞C

Power Efficiency (FC = Open) (ADM660) 90 93 % R
Power Efficiency (FC = Open) (ADM8660) 90 93 % R

Power Efficiency (FC = Open) (ADM8660) 88.5 % R

= 500 W Connected from OUT to GND

L

= 500 W Connected from OUT to GND,

L

T

= +25∞C

A

= 500 W Connected from OUT to GND,

L

T

= –40∞C to +85∞C

A

Power Efficiency (FC = Open) 81.5 % IL = 100 mA to GND

Voltage Conversion Efficiency 99 99.96 % No Load

Shutdown Supply Current, I
Shutdown Input Voltage, V

SHDN

SHDN

2.4 V SHDN High = Disabled

0.3 5 mA ADM8660, SHDN = V+

0.8 V SHDN Low = Enabled

Shutdown Exit Time 500 msI

*

C1 and C2 are low ESR (<0.2 W) electrolytic capacitors.

High ESR degrade performance.

Specifications subject to change without notice.

= 100 mA

L

REV. B–2–

ADM660/ADM8660

ABSOLUTE MAXIMUM RATINGS*

(TA = +25°C, unless otherwise noted.)

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)

, Thermal Impedance . . . . . . . . . . . . . . . . . . . . 120°C/W

θ

JA

Power Dissipation, R-8 . . . . . . . . . . . . . . . . . . . . . . . 450 mW

(Derate 6 mW/°C above +50°C)

, Thermal Impedance . . . . . . . . . . . . . . . . . . . . 170°C/W

θ

JA

ORDERING GUIDE

Temperature Package

Model Range Options

ADM660AN –40°C to +85°C N-8
ADM660AR –40°C to +85°CR-8
ADM660ARU –40°C to +85°C RU-16
ADM8660AN –40°C to +85°C N-8
ADM8660AR –40°C to +85°CR-8

*

N = Plastic DIP; RU = Thin Shrink Small Outline; RN = Small Outline.

Power Dissipation, RU-16 . . . . . . . . . . . . . . . . . . . . . 500 mW

(Derate 6 mW/°C above +50°C)

, Thermal Impedance . . . . . . . . . . . . . . . . . . . . 158°C/W

θ

JA

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.

*

CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection. Although the
ADM660/ADM8660 features proprietary ESD protection circuitry, permanent damage may occur on
devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are
recommended to avoid performance degradation or loss of functionality.

REV. B

–3–

ADM660/ADM8660

PIN CONNECTIONS

8-Lead

1

FC

2

CAP+

3

GND

4

CAP–

Inverter Configuration

ADM660

TOP VIEW

(Not to Scale)

8

V+

7

OSC

6

LV

5

OUT

CAP+

GND

CAP–

FC

1

ADM8660

2

TOP VIEW

3

(Not to Scale)

4

16-Lead

1

NC

2

NC

3

FC

4

CAP+

5

6

CAP–

7

NC

8

NC

NC = NO CONNECT

ADM660

TOP VIEW

(Not to Scale)

16

NC

15

NC

14

V+

13

OSC

12

LVGND

11

OUT

10

NC

NC

9

PIN FUNCTION DESCRIPTIONS

8

V+

7

SD

6

LV

5

OUT

Doubler Configuration (ADM660 Only)

Mnemonic Function

FC Frequency Control Input for Internal Oscillator

and Charge Pump. With FC = Open (ADM660)
or connected to GND (ADM8660), f
with FC = V+, f

= 120 kHz.

CP

= 25 kHz;

CP

CAP+ Positive Charge-Pump Capacitor Terminal.

GND Power Supply Ground.

CAP– Negative Charge-Pump Capacitor Terminal.

OUT Output, Negative Voltage.

LV Low Voltage Operation Input. Connect to GND

when input voltage is less than 3.5 V. Above

3.5 V, LV may be connected to GND or left
unconnected.

OSC ADM660: Oscillator Control Input. OSC is

connected to an internal 15 pF capacitor. An
external capacitor may be connected to slow the
oscillator. An external oscillator may also be
used to overdrive OSC. The charge-pump
frequency is equal to 1/2 the oscillator frequency.

SD ADM8660: Shutdown Control Input. This in-

put, when high, is used to disable the charge
pump thereby reducing the power consumption.

V+ Positive Power Supply Input.

Mnemonic Function

FC Frequency Control Input for Internal Oscillator

and Charge Pump. With FC = Open, f
25 kHz; with FC = V+, f

= 120 kHz.

CP

CP

=

CAP+ Positive Charge-Pump Capacitor Terminal.

GND Positive Input Supply.

CAP– Negative Charge-Pump Capacitor Terminal.

OUT Ground.

LV Low Voltage Operation Input. Connect to OUT.

OSC Must be left unconnected in this mode.

V+ Doubled Positive Output.

REV. B–4–