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Analog Devices - 120 mA Switched Capacitor Voltage Inverter with Regulated Output

Numéro de référence ADP3605
Description 120 mA Switched Capacitor Voltage Inverter with Regulated Output
Fabricant Analog Devices 
Logo Analog Devices 





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ADP3605 fiche technique
a
120 mA Switched Capacitor
Voltage Inverter with Regulated Output
ADP3605
FEATURES
Fully Regulated Output Voltage (–3 V and Adjustable)
High Output Current: 120 mA
Output Accuracy: ؎3%
250 kHz Switching Frequency
Low Shutdown Current: 2 A Typical
Input Voltage Range from 3 V to 6 V
SO-8 and RU-14 Packages
–40؇C to +85؇C Ambient Temperature Range
APPLICATIONS
Voltage Inverters
Voltage Regulators
Computer Peripherals and Add-On Cards
Portable Instruments
Battery Powered Devices
Pagers and Radio Control Receivers
Disk Drives
Mobile Phones
FUNCTIONAL BLOCK DIAGRAM
CP+
CP
VIN
S PD
S1
ADP3605
SND
S2
DNS
S3
B
DNS
S4
VOUT
OSC
SD CLOCK
GEN
FEEDBACK
CONTROL
LOOP
VSENSE
GND
GENERAL DESCRIPTION
The ADP3605 is a 120 mA regulated output switched capacitor
voltage inverter. It provides a regulated output voltage with
minimum voltage loss and requires a minimum number of ex-
ternal components. In addition, the ADP3605 does not require
the use of an inductor.
Pin-for-pin and functionally compatible with the ADP3604, the
internal oscillator of the ADP3605 runs at 500 kHz nominal
frequency which produces an output switching frequency of
250 kHz. This allows for the use of smaller charge pump and
filter capacitors.
The ADP3605 provides an accuracy of ± 3% with a typical shut-
down current of 2 µA. It can also operate from a single positive
input voltage as low as 3 V. The ADP3605 is offered with the
regulation fixed at –3 V or adjustable via external resistors over
a –3 V to –6 V range.
VIN
+
* CIN
4.7F
*CP +
4.7F
VIN VOUT
CP+
ADP3605-3
–3.0V
* CO
+ 4.7F
CP
OFF
SD
ON
0
GND
VSENSE
*FOR BEST PERFORMANCE, 10F IS RECOMMENDED
CP : SPRAGUE, 293D475X0010B2W
CIN, CO: TOKIN, 1E475ZY5UC205F
Figure 1. Typical Application Circuit
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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