ADP1111AN-33 Analog Devices, ADP1111AN-33 Datasheet

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ADP1111AN-33

Manufacturer Part Number
ADP1111AN-33
Description
Micropower/ Step-Up/Step-Down SW Regulator; Adjustable and Fixed 3.3 V/ 5 V/ 12 V
Manufacturer
Analog Devices
Datasheet
a
GENERAL DESCRIPTION
The ADP1111 is part of a family of step-up/step-down switch-
ing regulators that operates from an input voltage supply of 2 V
to 12 V in step-up mode and up to 30 V in step-down mode.
The ADP1111 can be programmed to operate in step-up/step-
down or inverting applications with only 3 external components.
The fixed outputs are 3.3 V, 5 V and 12 V; and an adjustable
version is also available. The ADP1111 can deliver 100 mA at
5 V from a 3 V input in step-up mode, or it can deliver 200 mA
at 5 V from a 12 V input in step-down mode.
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.
FEATURES
Operates from 2 V to 30 V Input Voltage Range
72 kHz Frequency Operation
Utilizes Surface Mount Inductors
Very Few External Components Required
Operates in Step-Up/Step-Down or Inverting Mode
Low Battery Detector
User Adjustable Current Limit
Internal 1 A Power Switch
Fixed or Adjustable Output Voltage
8-Pin DIP or SO-8 Package
APPLICATIONS
3 V to 5 V, 5 V to 12 V Step-Up Converters
9 V to 5 V, 12 V to 5 V Step-Down Converters
Laptop and Palmtop Computers
Cellular Telephones
Flash Memory VPP Generators
Remote Controls
Peripherals and Add-On Cards
Battery Backup Supplies
Uninterruptible Supplies
Portable Instruments
Regulator; Adjustable and Fixed 3.3 V, 5 V, 12 V
Micropower, Step-Up/Step-Down SW
Maximum switch current can be programmed with a single
resistor, and an open collector gain block can be arranged in
multiple configuration for low battery detection, as a post linear
regulator, undervoltage lockout, or as an error amplifier.
If input voltages are lower than 2 V, see the ADP1110.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
V
V
IN
IN
REFERENCE
REFERENCE
GND
GND
1.25V
1.25V
FUNCTIONAL BLOCK DIAGRAMS
R1
SET
SET
FB
World Wide Web Site: http://www.analog.com
R2 220k
COMPARATOR
COMPARATOR
A1
A1
A2
A2
SENSE
GAIN BLOCK/
ERROR AMP
GAIN BLOCK/
ERROR AMP
OSCILLATOR
OSCILLATOR
© Analog Devices, Inc., 1996
ADP1111
ADP1111-5
ADP1111-12
ADP1111
DRIVER
DRIVER
SW2
A0
I
SW1
A0
I
SW1
SW2
LIM
LIM

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