ADM8660 Analog Devices, ADM8660 Datasheet

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ADM8660

Manufacturer Part Number
ADM8660
Description
CMOS Switched-Capacitor Voltage Converter w/ Low Power Shutdown Pin
Manufacturer
Analog Devices
Datasheet

Specifications of ADM8660

Input Voltage (v)
1.5 - 7
Vout Preset (v)
-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
PDIP-8,SOIC-8

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GENERAL DESCRIPTION
The ADM660/ADM8660 is a charge-pump voltage converter
that can be used to either invert the input supply voltage giving
V
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.
REV.
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.
OUT
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
= –V
C
IN
or double it (ADM660 only) giving V
OUT
= 2
V
IN
.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax:
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.
Option
Inverting Mode
Doubling Mode
External Oscillator
Shutdown
Package Options
R-8
N-8
RU-16
781/461-3113
SHUTDOWN
10 F
10 F
CONTROL
Voltage Inverter Configuration (ADM660)
C1
TYPICAL CIRCUIT CONFIGURATIONS
C1
CMOS Switched-Capacitor
+
+
ADM660/ADM8660 Options
FC
CAP+
GND
CAP–
©
FC
CAP+
GND
CAP–
SD
2011
ADM660/ADM8660
ADM660
ADM8660
Voltage Converters
Analog Devices, Inc. All rights reserved.
ADM660
Y
Y
Y
N
Y
Y
Y
OSC
OUT
OUT
V+
LV
+1.5V TO +7V
V+
LV
INPUT
+1.5V TO +7V
+
INPUT
+
C2
10 F
C2
10 F
www.analog.com
INVERTED
NEGATIVE
OUTPUT
INVERTED
NEGATIVE
OUTPUT
ADM8660
Y
N
N
Y
Y
Y
N

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ADM8660 Summary of contents

Page 1

... With input voltages from 2 output voltages from 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. ...

Page 2

... Min Typ Max Unit Test Conditions/Comments R L 3.5 7.0 V Inverting Mode Open 1.5 7.0 V Inverting Mode GND 2.5 7.0 V Doubling Mode OUT No Load 0 Open (ADM660), GND (ADM8660) 2 Open 100 16 kHz FC = Open (ADM660), GND (ADM8660) 120 ...

Page 3

... 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 ...

Page 4

... 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. ...

Page 5

... Typical Performance Characteristics–ADM660/ADM8660 3.0 2.5 VOLTAGE DOUBLER LV = OUT 2.0 1.5 1 GND 0.5 0 1.5 3.5 7 SUPPLY VOLTAGE – Volts TPC 1. Power Supply Current vs. Voltage –3.0 EFFICIENCY –3.4 –3.8 –4.2 V OUT –4.6 –5 LOAD CURRENT – mA TPC 2. Output Voltage and Efficiency vs. Load Current 1.6 1 +3. +2.5V 0 +1. +5.5V 0 ...

Page 6

... ADM660/ADM8660 5.0 LOAD = 10mA 4.5 LOAD = 1mA 4.0 3.5 LOAD = 50mA 3.0 2.5 2.0 LOAD = 80mA 1.5 1.0 0 CHARGE-PUMP FREQUENCY – kHz TPC 7. Output Voltage vs. Charge-Pump Frequency 1.5 2.5 3.5 4.5 SUPPLY VOLTAGE – Volts TPC 8. Output Source Resistance vs. Supply Voltage GND LV = OPEN 1.5 2.5 3.5 4.5 SUPPLY VOLTAGE – Volts TPC 9. Charge-Pump Frequency vs. Supply Voltage ...

Page 7

... TPC 14. Output Resistance vs. Temperature Switched Capacitor Theory of Operation As already described, the charge pump on the ADM660/ADM8660 uses a switched capacitor technique in order to invert or double the input supply voltage. Basic switched capacitor theory is discussed below. A switched capacitor building block is illustrated in Figure 3. With the switch in position A, capacitor C1 will charge to voltage V1 ...

Page 8

... TO +7V INPUT Shutdown Input The ADM8660 contains a shutdown input that can be used to disable the device and thus reduce the power consumption. A logic high level on the SD input shuts the device down reducing the quiescent current to 0.3 µA. During shutdown, the output voltage goes Therefore, ground referenced loads are not powered during this state. When exiting shutdown, it takes several cycles (approximately 500 µ ...

Page 9

... Refer to the Typical Performance Characteristics section. Bypass Capacitor The ac impedance of the ADM660/ADM8660 may be reduced by using a bypass capacitor on the input supply. This capacitor should be connected between the input supply and GND 100 will provide instantaneous current surges as required ...

Page 10

... ADM660/ADM8660 OUTLINE DIMENSIONS 0.210 (5.33) MAX 0.150 (3.81) 0.130 (3.30) 0.115 (2.92) 0.022 (0.56) 0.018 (0.46) 0.014 (0.36) 0.25 (0.0098) 0.10 (0.0040) COPLANARITY 0.400 (10.16) 0.365 (9.27) 0.355 (9.02 0.280 (7.11) 0.250 (6.35) 1 0.240 (6.10) 4 0.100 (2.54) BSC 0.060 (1.52) MAX 0.015 (0.38) 0.015 (0.38) MIN GAUGE PLANE SEATING PLANE 0.005 (0.13) MIN 0.070 (1.78) 0.060 (1.52) 0.045 (1.14) COMPLIANT TO JEDEC STANDARDS MS-001 CONTROLLING DIMENSIONS ARE IN INCHES ...

Page 11

... Thin Shrink Small Outline Package [TSSOP] 16-Lead Thin Shrink Small Outline Package [TSSOP] 16-Lead Thin Shrink Small Outline Package [TSSOP] 8-Lead Plastic Dual In-Line Package [PDIP] 8-Lead Standard Small Outline Package [SOIC_N] 8-Lead Standard Small Outline Package [SOIC_N] D00082-0-4/11(C) –11– ADM660/ADM8660 0.75 8° 0.60 0° 0.45 Package Option N-8 ...

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