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PDF ADP1110AR-33 Data sheet ( Hoja de datos )

Número de pieza ADP1110AR-33
Descripción Micropower/ Step-Up/Step-Down Switching Regulator; Adjustable and Fixed 3.3 V/ 5 V/ 12 V
Fabricantes Analog Devices 
Logotipo Analog Devices Logotipo



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No Preview Available ! ADP1110AR-33 Hoja de datos, Descripción, Manual

Micropower, Step-Up/Step-Down Switching
a Regulator; Adjustable and Fixed 3.3 V, 5 V, 12 V
ADP1110
FEATURES
Operates at Supply Voltages From 1.0 V to 30 V
Step-Up or Step-Down Mode
Minimal External Components Required
Low-Battery Detector
User-Adjustable Current Limiting
Fixed or Adjustable Output Voltage Versions
8-Pin DIP or SO-8 Package
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
FUNCTIONAL BLOCK DIAGRAMS
SET
ADP1110
A2
VIN
GAIN BLOCK/
ERROR AMP
220mV
REFERENCE
A1 OSCILLATOR
A0
ILIM
SW1
Q1
COMPARATOR
R2
R1 300k
DRIVER
GND
SENSE
SW2
ADP1110 Block Diagram—Fixed Output Version
SET
ADP1110
GENERAL DESCRIPTION
The ADP1110 is part of a family of step-up/step-down switch-
ing regulators that operate from an input voltage supply as little
as 1.0 V. This very low input voltage allows the ADP1110 to be
used in applications that use a single cell as the primary power
source.
The ADP1110 can be configured to operate in either step-up or
step-down mode, but for input voltages greater than 3 V, the
ADP1111 would be a more effective solution.
An auxiliary gain amplifier can serve as a low battery detector or
as a linear regulator.
The quiescent current of 300 µA makes the ADP1110 useful in
remote or battery powered applications.
A2
VIN
GAIN BLOCK/
ERROR AMP
220mV
REFERENCE
A1 OSCILLATOR
A0
ILIM
SW1
Q1
COMPARATOR
DRIVER
GND
FB
SW2
ADP1110 Block Diagram—Adjustable Output Version
The 70 kHz frequency operation also allows for the use of
surface-mount external capacitors and inductors.
Battery protection circuitry limits the effect of reverse current to
safe levels at reverse voltages up to 1.6 V.
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

1 page




ADP1110AR-33 pdf
78
76
74
72
OSCILLATOR FREQUENCY
70
68
66
64
0 25 70
TEMPERATURE – ؇C
Figure 8. Oscillator Frequency vs. Temperature
9.0
8.9
8.8
8.7
8.6
8.5
8.4
8.3
8.2
0
SWITCH ON TIME
25
TEMPERATURE – ؇C
70
Figure 9. Switch ON Time vs. Temperature
66
65
64
63
DUTY CYCLE
62
61
60
59
0 25 70
TEMPERATURE – ؇C
Figure 10. Duty Cycle vs. Temperature
ADP1110
0.54
0.53
0.52
0.51
0.5
0.49
0.48
0.47
0
VIN = +1.5 @ ISWITCH = +0.5A
25
TEMPERATURE – ؇C
70
Figure 11. Switch ON Voltage Step-Down vs. Temperature
350
300
QUIESCENT CURRENT
250
200
150
100
50
0
0 25
TEMPERATURE – ؇C
70
Figure 12. Quiescent Current vs. Temperature
160
155
150
145
140
135
130
125
120
0
BIAS CURRENT
25
TEMPERATURE – ؇C
70
Figure 13. FB Pin Bias Current vs. Temperature
REV. 0
–5–

5 Page





ADP1110AR-33 arduino
ADP1110
POSITIVE-TO-NEGATIVE CONVERSION
The ADP1110 can convert a positive input voltage to a negative
output voltage as shown in Figure 23. This circuit is essentially
identical to the step-down application of Figure 19, except that
the “output” side of the inductor is connected to power ground.
When the ADP1110’s internal power switch turns off, current
flowing in the inductor forces the output (–VOUT) to a negative
potential. The ADP1110 will continue to turn the switch on
until its FB pin is 220 mV above its GND pin, so the output
voltage is determined by the formula:
V OUT
= 220 mV
1
+
R1
R2
INPUT
CINPUT
RLIM
12
3
VIN ILIM SW1
SW2 4
ADP1110
FB 8
AO SET GND
6 75
D1
1N5818
L1
R1
R2
OUTPUT
CL
NC NC
NEGATIVE
OUTPUT
Figure 23. A Positive-to-Negative Converter
The design criteria for the step-down application also apply to
the positive-to-negative converter. The output voltage should be
limited to |6.2 V| unless a diode is inserted in series with the
SW2 pin (see Figure 21.) Also, D1 must again be a Schottky
diode to prevent excessive power dissipation in the ADP1110.
NEGATIVE-TO-POSITIVE CONVERSION
The circuit of Figure 24 converts a negative input voltage to a
positive output voltage. Operation of this circuit configuration is
similar to the step-up topology of Figure 19, except the current
through feedback resistor R1 is level-shifted below ground by a
PNP transistor. The voltage across R1 is VOUT – VBEQ1. However,
diode D2 level-shifts the base of Q1 about 0.6 V below ground
thereby cancelling the VBE of Q1. The addition of D2 also reduces
the circuit’s output voltage sensitivity to temperature, which other-
wise would be dominated by the –2 mV VBE contribution of Q1.
The output voltage for this circuit is determined by the formula:
V OUT
= 220 mV
R1
 R2
Unlike the positive step-up converter, the negative-to-positive
converter’s output voltage can be either higher or lower than the
input voltage.
CINPUT
L1 D1
RLIM
12
ILIM
VIN
SW1 3
ADP1110
FB 8
AO SET GND SW2
675 4
R1
Q1
2N3906
CL
D2
1N4148
10K
R2
POSITIVE
OUTPUT
NEGATIVE
INPUT
NC NC
Figure 24. A Negative-to-Positive Converter
LIMITING THE SWITCH CURRENT
The ADP1110’s RLIM pin permits the switch current to be
limited with a single resistor. This current limiting action occurs
on a pulse by pulse basis. This feature allows the input voltage
to vary over a wide range without saturating the inductor or
exceeding the maximum switch rating. For example, a particular
design may require peak switch current of 800 mA with a 2.0 V
input. If VIN rises to 4 V, however, the switch current will
exceed 1.6 A. The ADP1110 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 VIN increases. The relationship between RLIM
and maximum switch current is shown in Figure 6.
The ILIM feature is also valuable for controlling inductor current
when the ADP1110 goes into continuous-conduction mode.
This occurs in the step-up mode when the following condition is
met:
V

OUT +VD IODE
V IN V SW

<1–
1
DC
where DC is the ADP1110’s duty cycle. When this relationship
exists, the inductor current does not go all the way to zero
during the time that the switch is OFF. When the switch turns
on for the next cycle, the inductor current begins to ramp up
from the residual level. If the switch ON time remains constant,
the inductor current will increase to a high level (see Figure 25).
This increases output ripple and can require a larger inductor
and capacitor. By controlling switch current with the ILIM
resistor, output ripple current can be maintained at the design
values. Figure 26 illustrates the action of the ILIM circuit.
100
90
200mA/div.
10
0%
10mV
10µs
Figure 25. ILIM Operation—IL Characteristic
100
90
200mA/div.
10
0%
10mV
10µs
Figure 26. ILIM Operation—IL Characteristic
REV. 0
–11–

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