ADP1073 データシートの表示（PDF） - Analog Devices
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ADP1073 Datasheet PDF : 16 Pages
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a
Micropower DC–DC Converter
Adjustable and Fixed 3.3 V, 5 V, 12 V
ADP1073
FEATURES
Operates at Supply Voltages from 1.0 V to 30 V
Ground Current 100 A
Works in Step-Up or Step-Down Mode
Very Few External Components Required
Low Battery Detector On-Chip
User-Adjustable Current Limit
Internal 1 A Power Switch
Fixed and Adjustable Output Voltage Versions
8-Lead DIP or SO-8 Package
APPLICATIONS
Single-Cell to 5 V Converters
Laptop and Palmtop Computers
Pagers
Cameras
Battery Backup Supplies
Cellular Telephones
Portable Instruments
4 mA–20 mA Loop Powered Instruments
Hand-Held Inventory Computers
GENERAL DESCRIPTION
The ADP1073 is part of a family of step-up/step-down switch-
ing regulators that operates from an input supply voltage of as
little as 1.0 V. This extremely low input voltage allows the
ADP1073 to be used in applications requiring use of a single
cell battery as the primary power source.
The ADP1073 can be configured to operate in either step-up or
step-down mode but for input voltages greater than 3 V, the
ADP1173 is recommended.
An auxiliary gain amplifier can serve as a low battery detector or
linear regulator. Quiescent current on the ADP1073-5 is only
100 µA unloaded, making it ideal for systems where long battery
life is required.
The ADP1073 can deliver 40 mA at 5 V from an input voltage
range as low as 1.25 V, or 10 mA at 5 V from a 1.0 V input.
Current limiting is available by adding an external resistor.
FUNCTIONAL BLOCK DIAGRAMS
SET
VIN
212mV
REFERENCE
A2
GAIN BLOCK/
ERROR AMP
ADP1073
A1
OSCILLATOR
COMPARATOR
DRIVER
GND
FB
AO
ILIM
SW1
SW2
ADP1073
SET
VIN
212mV
REFERENCE
ADP1073-3.3
ADP1073-5
ADP1073-12
A2
GAIN BLOCK/
ERROR AMP
A1
OSCILLATOR
AO
ILIM
SW1
R1
GND
COMPARATOR
DRIVER
R2
904k⍀
ADP1073-3.3: R1 = 62.1k⍀
ADP1073-5: R1 = 40k⍀
ADP1073-12: R1 = 16.3k⍀
SENSE
ADP1073-3.3, 5, 12
SW2
REV. 0
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.
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Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 1997
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