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Analog Devices - Switched-Capacitor Voltage Inverter with Shutdown

Numéro de référence ADM8829
Description Switched-Capacitor Voltage Inverter with Shutdown
Fabricant Analog Devices 
Logo Analog Devices 





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ADM8829 fiche technique
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FEATURES
Inverts Input Supply Voltage
99% Voltage Conversion Efficiency
25 mA Output Current
Shutdown Function
Requires Only Two Capacitors
1 F Capacitors
18 Output Resistance
+1.5 V to +5.5 V Input Range
600 A Quiescent Current
20 nA Shutdown Current (ADM8828)
APPLICATIONS
Handheld Instruments
LCD Panels
Cellular Phones
PDAs
Remote Data Acquisition
Op Amp Power Supplies
Switched-Capacitor
Voltage Inverter with Shutdown
ADM8828/ADM8829
FUNCTIONAL BLOCK DIAGRAMS
OUT 1
6 CAP+
ADM8828
IN 2 TOP VIEW 5 SHDN
CAP– 3 (Not to Scale) 4 GND
OUT 1
6 CAP+
ADM8829
IN 2 TOP VIEW 5 NC
CAP– 3 (Not to Scale) 4 GND
NC = NO CONNECT
GENERAL DESCRIPTION
The ADM8828/ADM8829 is a charge-pump voltage inverter
which may be used to generate a negative supply from a positive
input. Input voltages ranging from +1.5 V to +5.5 V can be
inverted into a negative –1.5 V to –5.5 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 25 mA with
greater than 99% efficiency are achievable.
The ADM8828 also features a low power shutdown (SHDN)
pin. This can be used to disable the device and reduce the quies-
cent current to 20 nA.
The ADM8828/ADM8829 is available in a 6-lead SOT-23
package.
+1.5V TO +5.5V
INPUT
C1 +
1F
CAP+
IN
ADM8828/
ADM8829
CAP–
SHDN
GND
OUT
SHUTDOWN
CONTROL
C2
+ 1F
INVERTED
NEGATIVE
OUTPUT
Figure 1. Typical Circuit Configuration
REV. A
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 1999

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