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ADP1109A Datasheet(PDF) 1 Page - Analog Devices

Part No. ADP1109A
Description  Micropower Low Cost Fixed 3.3 V, 5 V, 12 V and Adjustable DC-to-DC Converter
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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ADP1109A Datasheet(HTML) 1 Page - Analog Devices

   
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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.
a
ADP1109A
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., 1997
Micropower Low Cost
Fixed 3.3 V, 5 V, 12 V and Adjustable
DC-to-DC Converter
FUNCTIONAL BLOCK DIAGRAM
120kHz
OSCILLATOR
ADP1109A-3.3: R1 = 152k
ADP1109A-5:
R1 = 83k
ADP1109A-12: R1 = 29k
VIN
SENSE
SW
PGND
SHUTDOWN
GND
1.25V
REFERENCE
R2
250k
R1
DRIVER
COMPARATOR
Q1
A1
120kHz
OSCILLATOR
ADP1109A
VIN
FB
SW
PGND
SHUTDOWN
GND
1.25V
REFERENCE
DRIVER
COMPARATOR
Q1
A1
FEATURES
Operates at Supply Voltages 2 V to 9 V
Fixed 3.3 V, 5 V, 12 V and Adjustable Output
Minimum External Components Required
Ground Current: 460
A
Oscillator Frequency: 120 kHz
Logic Shutdown
8-Lead DIP and SO-8 Packages
APPLICATIONS
Cellular Telephones
Single-Cell to 5 V Converters
Laptop and Palmtop Computers
Pagers
Cameras
Battery Backup Supplies
Portable Instruments
Laser Diode Drivers
Hand-Held Inventory Computers
GENERAL DESCRIPTION
The ADP1109A is a versatile step-up switching regulator. The
device requires only minimal external components to operate as
a complete switching regulator.
The ADP1109A-5 can deliver 100 mA at 5 V from a 3 V input
and the ADP1109A-12 can deliver 60 mA at 12 V from a 5 V
input. The device also features a logic controlled shutdown
capability that, when a logic low is applied, will shut down the
oscillator. The 120 kHz operating frequency allows for the use
of small surface mount components.
The gated oscillator capability eliminates the need for frequency
compensation.
TYPICAL APPLICATION
7
8
1
3
4
5
L1
33 H
D1
VOUT
12V
60mA
C1
22 F
16V
SHUTDOWN
PGND
GND
VIN
SW
SENSE
ADP1109A-12
VIN
5V
SHUTDOWN/PROGRAM
+
Flash Memory VPP Generator


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