ADP1111 Analog Devices, ADP1111 Datasheet

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ADP1111

Manufacturer Part Number
ADP1111
Description
Micropower, Step-Up/Step-Down SW Regulator; Adjustable and Fixed 3.3 V, 5 V, 12 V
Manufacturer
Analog Devices
Datasheet

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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
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Tel: 617/329-4700
Fax: 617/326-8703
Fax: 781.461.3113
V
V
IN
IN
REFERENCE
REFERENCE
GND
GND
1.25V
1.25V
FUNCTIONAL BLOCK DIAGRAMS
R1
SET
SET
©1996–2009 Analog Devices, Inc. All rights reserved.
FB
World Wide Web Site: http://www.analog.com
©2009 Analog Devices, Inc. All rights reserved.
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
www.analog.com
DRIVER
www.analog.com
SW2
A0
I
SW1
A0
I
SW1
SW2
LIM
LIM

ADP1111 Summary of contents

Page 1

... The fixed outputs are 3 and 12 V; and an adjustable version is also available. The ADP1111 can deliver 100 from input in step-up mode can deliver 200 from input in step-down mode. ...

Page 2

... I Tied LIM +25° 3 650 SAT 650 ADP1111 SET REF SET = 300 μA I SINK SET ≤ V ≤ ≤ V ≤ 100 kΩ ...

Page 3

... SET pin and its negative input is con- nected to the 1.25 V reference. It can be left open if unused. On the ADP1111 (adjustable) version this pin is con- nected to the comparator input. On the ADP1111-3.3, ADP1111-5 and ADP1111-12, the pin goes directly to the internal application resistor that sets output voltage ...

Page 4

... ADP1111–Typical Characteristics 1.4 1.2 1 0.4 0.2 0 0.1 0.2 0.4 0.6 I CURRENT – A SWITCH Figure 2. Saturation Voltage vs. I Step-Up Mode 2.0 1.8 1.6 1.4 1 12V IN 1.0 0.8 0.6 0.4 0.2 0 0.1 0.2 0.4 0.6 I CURRENT – A SWITCH Figure 3. Switch ON Voltage vs. I Step-Down Mode 1400 1200 1000 QUIESCENT CURRENT 800 600 400 200 0 1 INPUT VOLTAGE – V Figure 4 ...

Page 5

... Figure 12. Quiescent Current vs. Temperature 250 200 150 100 50 0 – Figure 13. Feedback Bias Current vs. Temperature –5– ADP1111 @ V = 12V I = 0.65A TEMPERATURE – C QUIESCENT CURRENT TEMPERATURE – C BIAS CURRENT 0 ...

Page 6

... ADP1111, the output voltage can be higher, lower opposite polarity than the input voltage. To specify an inductor for the ADP1111, the proper values of inductance, saturation current and dc resistance must be determined. This process is not difficult, and specific equations for each circuit configuration are provided in this data sheet ...

Page 7

... Replacing ‘t’ in the above equation with the ON time of the ADP1111 (7 μs, typical) will define the peak current for a given inductor value and input voltage. At this point, the inductor energy can be calculated as follows • PEAK L ...

Page 8

... INDUCTOR SELECTION–POSITIVE-TO-NEGATIVE CONVERTER The configuration for a positive-to-negative converter using the ADP1111 is shown in Figure 22. As with the step-up converter, all of the output power for the inverting circuit must be supplied by the inductor. The required inductor power is derived from the formula: ...

Page 9

... D1 into the load, and the output voltage is driven above the input voltage. The output voltage is fed back to the ADP1111 via resistors R1 and R2. When the voltage at pin FB falls below 1.25 V, SW1 turns “on” again, and the cycle repeats. The output voltage is therefore set by the formula: = 1.25 V • ...

Page 10

... IN CE OUT Figure 20. Step-Down Model the input voltage to the ADP1111 varies over a wide range, a • 7μs current limiting resistor at Pin 1 may be required particular circuit requires high peak inductor current with minimum input supply voltage, the peak current may exceed the switch maxi- mum rating and/or saturate the inductor when the supply voltage is at the maximum value. See the “ ...

Page 11

... For example, a particular design may require peak switch current of 800 mA with a 2.0 V input exceed 1.6 A. The ADP1111 limits switch current to 1.5 A and thereby protects the switch, but the output ripple will increase. Selecting the proper resistor will limit the switch current to 800 mA, even if V and maximum switch current is shown in Figure 6 ...

Page 12

... ON time; however, the ADP1111 will still provide a properly regulated output voltage. PROGRAMMING THE GAIN BLOCK The gain block of the ADP1111 can be used as a low-battery detector, error amplifier or linear post regulator. The gain block consists amp with PNP inputs and an open-collector NPN output. The inverting input is internally connected to the ADP1111’ ...

Page 13

... All Surface Mount Step-Up Converter This is the most basic application (along with the basic step- down configuration to follow) of the ADP1111. It takes full advantage of surface mount packaging for all the devices used in the design. The circuit can provide + 100 mA of output current and can be operated off of battery power for use in portable equipment ...

Page 14

... Figure 32. Voltage Controlled Positive-to-Negative Converter + –22 V LCD Bias Generator This circuit uses an adjustable-output version of the ADP1111 to generate a +22.5 V reference output that is level-shifted to give an output of – operation from a +5 volt supply is desired, change ohms. The circuit will deliver 7 mA with a 3 volt supply and 40 mA with a 5 volt supply ...

Page 15

... V ADP1111ANZ ADP1111ARZ ADJ ADP1111ARZ- ADP1111ARZ-12-REEL 12 V ADP1111ARZ-3.3 3.3 V ADP1111ARZ ADP1111ARZ-5-REEL 5 V ADP1111ARZ-REEL ADJ RoHS Compliant Part. ©1996–2009 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D08365-0-11/09(A) REV. A ...

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