ADP1111AR

Manufacturer Part NumberADP1111AR
Description36V; 500mW; micropower, step-up/step-down SW regulator. For 3V to 5V, 5V to 12V step-up converters, 9-5V, 12-5V step-down converters, lap-top and palmtop computers
ManufacturerAnalog Devices
ADP1111AR datasheet
 
1
Page 1
2
Page 2
3
Page 3
4
Page 4
5
Page 5
6
Page 6
7
Page 7
8
Page 8
9
Page 9
10
Page 10
11
12
13
14
15
16
Page 1/16

Download datasheet (409Kb)Embed
Next
a
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
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.
Micropower, Step-Up/Step-Down SW
Regulator; Adjustable and Fixed 3.3 V, 5 V, 12 V
V
IN
1.25V
REFERENCE
GND
V
IN
1.25V
REFERENCE
GND
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
ADP1111
FUNCTIONAL BLOCK DIAGRAMS
SET
ADP1111
A2
GAIN BLOCK/
ERROR AMP
OSCILLATOR
A1
DRIVER
COMPARATOR
FB
SET
ADP1111-5
ADP1111-12
A2
GAIN BLOCK/
ERROR AMP
OSCILLATOR
A1
DRIVER
COMPARATOR
R1
R2 220k
SENSE
World Wide Web Site: http://www.analog.com
© Analog Devices, Inc., 1996
A0
I
LIM
SW1
SW2
A0
I
LIM
SW1
SW2

ADP1111AR Summary of contents