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Micropower, Step-Up/Step-Down SW
Regulator; Adjustable and Fixed 3.3 V, 5 V, 12 V
ADP1111
FUNCTIONAL BLOCK DIAGRAMS
SET
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
ADP1111
A2
V
IN
GAIN BLOCK/
ERROR AMP
A0
I
LIM
SW1
1.25V
REFERENCE
A1
OSCILLATOR
DRIVER
COMPARATOR
GND
FB
SET
SW2
ADP1111-5
ADP1111-12
A2
V
IN
GAIN BLOCK/
ERROR AMP
A0
I
LIM
SW1
1.25V
REFERENCE
A1
OSCILLATOR
DRIVER
SW2
R1
COMPARATOR
R2 220k
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.
GND
SENSE
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.
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
World Wide Web Site: http://www.analog.com
Fax: 617/326-8703
© Analog Devices, Inc., 1996
ADP1111–SPECIFICATIONS
(0 C
≤
T
≤
+70 C, V
A
IN
= 3 V unless otherwise noted)
V
S
I
Q
V
IN
2.0
Min
Typ
300
Max
500
12.6
30.0
1.25
3.30
5.00
12.00
8
21
32
75
f
OSC
54
43
5
72
50
7
0.5
0.8
1.1
160
270
0.15
0.02
0.4
A
V
I
LIM
1000
6000
400
–0.3
1.30
3.47
5.25
12.60
12.5
50
50
120
88
65
9
0.65
1.0
1.5
300
400
0.4
0.075
Units
µA
V
V
V
V
V
V
mV
mV
mV
mV
kHz
%
µs
V
V
V
nA
nA
V
%/V
%/V
V/V
mA
%/°C
Parameter
QUIESCENT CURRENT
INPUT VOLTAGE
COMPARATOR TRIP POINT
VOLTAGE
OUTPUT SENSE VOLTAGE
Conditions
Switch Off
Step-Up Mode
Step-Down Mode
ADP1111
1
ADP1111-3.3
ADP1111-5
2
ADP1111-12
2
ADP1111
ADP1111-3.3
ADP1111-5
ADP1111-12
1.20
V
OUT
3.13
4.75
11.40
COMPARATOR HYSTERESIS
OUTPUT HYSTERESIS
OSCILLATOR FREQUENCY
DUTY CYCLE
SWITCH ON TIME
SW SATURATION VOLTAGE
STEP-UP MODE
STEP-DOWN MODE
FEEDBACK PIN BIAS CURRENT
SET PIN BIAS CURRENT
GAIN BLOCK OUTPUT LOW
REFERENCE LINE REGULATION
GAIN BLOCK GAIN
CURRENT LIMIT
CURRENT LIMIT TEMPERATURE
COEFFICIENT
SWITCH OFF LEAKAGE CURRENT
T
A
= +25°C
Measured at SW1 Pin
V
SW1
= 12 V
T
A
= +25°C
I
SW1
≤
10
µA,
Switch Off
Full Load
I
LIM
Tied to V
IN
T
A
= +25°C
V
IN
= 3.0 V, I
SW
= 650 mA
V
IN
= 5.0 V, I
SW
= 1 A
V
IN
= 12 V, I
SW
= 650 mA
ADP1111 V
FB
= 0 V
V
SET
= V
REF
I
SINK
= 300
µA
V
SET
= 1.00 V
5 V
≤
V
IN
≤
30 V
2 V
≤
V
IN
≤
5 V
R
L
= 100 kΩ
3
T
A
= +25°C
220
Ω
from I
LIM
to V
IN
DC
t
ON
V
SAT
I
FB
I
SET
V
OL
1
–400
10
–350
µA
mV
MAXIMUM EXCURSION BELOW GND
NOTES
1
This specification guarantees that both the high and low trip points of the comparator fall within the 1.20 V to 1.30 V range.
2
The output voltage waveform will exhibit a sawtooth shape due to the comparator hysteresis. The output voltage on the fixed output versions will always be within
the specified range.
3
100 kΩ resistor connected between a 5 V source and the AO pin.
4
All limits at temperature extremes are guaranteed via correlation using standard statistical methods.
Specifications subject to change without notice.
–2–
REV. 0
ADP1111
ABSOLUTE MAXIMUM RATINGS
PIN DESCRIPTIONS
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 V
SW1 Pin Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 V
SW2 Pin Voltage . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to V
IN
Feedback Pin Voltage (ADP1111) . . . . . . . . . . . . . . . . . 5.5 V
Switch Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5 A
Maximum Power Dissipation . . . . . . . . . . . . . . . . . . 500 mW
Operating Temperature Range
ADP1111A . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to +70°C
Storage Temperature Range . . . . . . . . . . . . . –65°C to 150°C
Lead Temperature (Soldering, 10 sec) . . . . . . . . . . . . . 300°C
TYPICAL APPLICATION
SUMIDA
CD54-220K
22µH
MBRS120T3
3V
INPUT
I
LIM
V
IN
SW1
10µF
(OPTIONAL)
5V
100mA
Mnemonic
I
LIM
Function
For normal conditions this pin is connected to
V
IN
. When lower current is required, a resistor
should be connected between I
LIM
and V
IN
.
Limiting the switch current to 400 mA is achieved
by connecting a 220
Ω
resistor.
Input Voltage.
Collector Node of Power Transistor. For step-
down configuration, connect to V
IN
. For step-up
configuration, connect to an inductor/diode.
Emitter Node of Power Transistor. For step-
down configuration, connect to inductor/diode.
For step-up configuration, connect to ground.
Do not allow this pin to go more than a diode
drop below ground.
Ground.
Auxiliary Gain (GB) Output. The open collector
can sink 300
µA.
It can be left open if unused.
Gain Amplifier Input. The amplifier’s positive
input is connected to SET pin and its negative
input is connected to the 1.25 V reference. It can
be left open if unused.
On the ADP1111 (adjustable) version this pin
is connected 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.
PIN CONFIGURATIONS
V
IN
SW1
SW2
GND
AO
33µF
ADP1111AR-5
SENSE
GND
SW2
SET
FB/SENSE
Figure 1. 3 V to 5 V Step-Up Converter
ORDERING GUIDE
Model
ADP1111AN
ADP1111AR
ADP1111AN-3.3
ADP1111AR-3.3
ADP1111AN-5
ADP1111AR-5
ADP1111AN-12
ADP1111AR-12
Output Voltage
ADJ
ADJ
3.3 V
3.3 V
5V
5V
12 V
12 V
Package*
N-8
SO-8
N-8
SO-8
N-8
SO-8
N-8
SO-8
8-Lead Plastic DIP
(N-8)
8-Lead SOIC
(SO-8)
I
LIM
1
V
IN
SW1
SW2
2
8 FB (SENSE)*
I
LIM
1
V
IN
SW1
SW2
2
8 FB (SENSE)*
ADP1111
7 SET
TOP VIEW
3 (Not to Scale) 6 A0
4
5 GND
7 SET
TOP VIEW
3 (Not to Scale) 6 A0
4
5 GND
ADP1111
*N = Plastic DIP, SO = Small Outline Package.
*FIXED VERSIONS
*FIXED VERSIONS
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the ADP1111 features proprietary ESD protection circuitry, permanent damage may
occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD
precautions are recommended to avoid performance degradation or loss of functionality.
WARNING!
ESD SENSITIVE DEVICE
REV. 0
–3–
ADP1111–Typical Characteristics
1.4
1.2
SATURATION VOLTAGE – V
1.0
76
75
OSCILLATOR FREQUENCY – kHz
74
73
72
71
70
69
68
67
OSCILLATOR FREQUENCY
0.8
V
IN
= 5V
0.6
V
IN
= 2V
0.4
0.2
V
IN
= 3V
0
0.1
0.2
0.4
0.6
0.8
I
SWITCH
CURRENT – A
1.0
1.2
2
4
6
8
10
12 15
18
INPUT VOLTAGE – V
21
24
27
30
Figure 2. Saturation Voltage vs. I
SWITCH
Current in
Step-Up Mode
Figure 5. Oscillator Frequency vs. Input Voltage
2.0
1.8
1.6
1.4
ON VOLTAGE – V
1.9
1.7
1.5
STEP-DOWN WITH
V
IN
= 12V
SWITCH CURRENT – A
1.3
1.1
0.9
0.7
0.5
0.3
0.1
1
10
100
1000
STEP-UP WITH
2V < V
IN
< 5V
1.2
1.0
0.8
0.6
0.4
0.2
0
0.1
V
IN
= 12V
0.2
0.6
I
SWITCH
CURRENT – A
0.4
0.8
0.9
R
LIM
–
Ω
Figure 3. Switch ON Voltage vs. I
SWITCH
Current In
Step-Down Mode
Figure 6. Maximum Switch Current vs. R
LIM
1400
1200
QUIESCENT CURRENT – µA
80
78
OSCILLATOR FREQUENCY – kHz
76
74
72
70
68
66
64
62
60
–40
0
25
TEMPERATURE – C
70
85
OSCILLATOR FREQUENCY
1000
QUIESCENT CURRENT
800
600
400
200
0
1.5
3
6
9
12
15
18
21
24
27
30
INPUT VOLTAGE – V
Figure 4. Quiescent Current vs. Input Voltage
Figure 7. Oscillator Frequency vs. Temperature
–4–
REV. 0
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