DataSheet.es    


PDF ADP1111 Data sheet ( Hoja de datos )

Número de pieza ADP1111
Descripción Micropower/ Step-Up/Step-Down SW Regulator; Adjustable and Fixed 3.3 V/ 5 V/ 12 V
Fabricantes Analog Devices 
Logotipo Analog Devices Logotipo



Hay una vista previa y un enlace de descarga de ADP1111 (archivo pdf) en la parte inferior de esta página.


Total 16 Páginas

No Preview Available ! ADP1111 Hoja de datos, Descripción, Manual

Micropower, Step-Up/Step-Down SW
a Regulator; Adjustable and Fixed 3.3 V, 5 V, 12 V
ADP1111
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.
FUNCTIONAL BLOCK DIAGRAMS
SET
ADP1111
A2
VIN
GAIN BLOCK/
ERROR AMP
1.25V
REFERENCE
A1 OSCILLATOR
COMPARATOR
DRIVER
A0
ILIM
SW1
GND
FB
SET
SW2
VIN
1.25V
REFERENCE
R1
A2
GAIN BLOCK/
ERROR AMP
ADP1111-5
ADP1111-12
A0
ILIM
SW1
A1 OSCILLATOR
COMPARATOR
R2 220k
DRIVER
SW2
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

1 page




ADP1111 pdf
7.5
7.4
7.3
7.2
7.1
7.0
6.9
6.8
6.7
6.6
–40
ON TIME
0 25 70
TEMPERATURE – ؇C
85
Figure 8. Switch ON Time vs. Temperature
ADP1111
1.10
1.05
1.00
VIN = 12V @ ISW = 0.65A
0.95
0.90
0.85
0.80
–40
0 25 70
TEMPERATURE – ؇C
85
Figure 11. Switch ON Voltage vs. Temperature in Step-
Down Mode
58
56
DUTY CYCLE
54
52
50
48
46
–40
0 25 70
TEMPERATURE – ؇C
85
Figure 9. Duty Cycle vs. Temperature
500
450
400
350
300
250
200
150
100
50
0
–40
QUIESCENT CURRENT
0 25 70
TEMPERATURE – ؇C
85
Figure 12. Quiescent Current vs. Temperature
0.6
0.5
VIN = 3V @ ISW = 0.65A
0.4
0.3
0.2
0.1
0
–40 0
25 70 85
TEMPERATURE – ؇C
Figure 10. Saturation Voltage vs. Temperature in Step-Up
Mode
250
200
BIAS CURRENT
150
100
50
0
–40 0 25 70 85
TEMPERATURE – ؇C
Figure 13. Feedback Bias Current vs. Temperature
REV. 0
–5–

5 Page





ADP1111 arduino
ADP1111
Table I. Component Selection for Typical Converters
Input Output Output
Circuit Inductor Inductor
Voltage Voltage Current (mA) Figure Value
Part No.
2 to 3.1
2 to 3.1
2 to 3.1
2 to 3.1
5
5
6.5 to 11
12 to 20
20 to 30
5
12
5
5
12
12
12
12
5
5
5
–5
–5
90 mA
10 mA
30 mA
10 mA
90 MA
30 mA
50 mA
300 mA
300 mA
7 mA
250 mA
4
15 µH
CD75-150K
4
47 µH
CTX50-1
4
15 µH
CD75-150K
4
47 µH
CTX50-1
4
33 µH
CD75-330K
4
47 µH
CTX50-1
5 15 µH
5
56 µH
CTX50-4
5 120 µH CTX100-4
6
56 µH
CTX50-4
6 120 µH CTX100-4
NOTES
CD = Sumida.
CTX = Coiltronics.
**Add 47 from ILIM to VIN.
**Add 220 from ILIM to VIN.
Capacitor
Value
33 µF
10 µF
22 µF
10 µF
22 µF
15 µF
47 µF
47 µF
47 µF
47 µF
100 µF
Notes
*
**
**
**
**
POSITIVE-TO-NEGATIVE CONVERSION
The ADP1111 can convert a positive input voltage to a negative
output voltage as shown in Figure 22. 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 ADP1111’s internal power switch turns off, current
flowing in the inductor forces the output (–VOUT) to a negative
potential. The ADP1111 will continue to turn the switch on
until its FB pin is 1.25 V above its GND pin, so the output
voltage is determined by the formula:
VOUT
= 1.25 V
• 1 +
R2
R1 
INPUT
+
CINPUT
RLIM
123
ILIM VIN SW1
SW2 4
ADP1111
AO
SET
FB
GND
8
67
NC NC
5
D1
1N5818
L1
R2
OUTPUT
+
R1 CL
NEGATIVE
OUTPUT
also reduces the circuit’s output voltage sensitivity to tempera-
ture, which otherwise would be dominated by the –2 mV VBE
contribution of Q1. The output voltage for this circuit is
determined by the formula:
VOUT
=
1.25 V
R2
R1
Unlike the positive step-up converter, the negative-to-positive
converter’s output voltage can be either higher or lower than the
input voltage.
L1
RLIM
+
C2
12
ILIM VIN
SW1 3
ADP1111
FB 8
AO SET GND SW2
6 754
D1
1N5818
R2
Q1
MJE210
+
D2
2N3906
POSITIVE
OUTPUT
CL
10k
R1
NEGATIVE
INPUT
NC NC
Figure 23. ADP1111 Negative-to-Positive Converter
Figure 22. 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 20.) Also, D1 must again be a Schottky
diode to prevent excessive power dissipation in the ADP1111.
NEGATIVE-TO-POSITIVE CONVERSION
The circuit of Figure 23 converts a negative input voltage to a
positive output voltage. Operation of this circuit configuration is
similar to the step-up topology of Figure 18, except the current
through feedback resistor R2 is level-shifted below ground by a
PNP transistor. The voltage across R2 is VOUT –VBEQ1. How-
ever, diode D2 level-shifts the base of Q1 about 0.6 V below
ground thereby cancelling the VBE of Q1. The addition of D2
LIMITING THE SWITCH CURRENT
The ADP1111’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 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 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 ADP1111 goes into continuous-conduction mode.
REV. 0
–11–

11 Page







PáginasTotal 16 Páginas
PDF Descargar[ Datasheet ADP1111.PDF ]




Hoja de datos destacado

Número de piezaDescripciónFabricantes
ADP1110Micropower/ Step-Up/Step-Down Switching Regulator; Adjustable and Fixed 3.3 V/ 5 V/ 12 VAnalog Devices
Analog Devices
ADP1110ANMicropower/ Step-Up/Step-Down Switching Regulator; Adjustable and Fixed 3.3 V/ 5 V/ 12 VAnalog Devices
Analog Devices
ADP1110AN-12Micropower/ Step-Up/Step-Down Switching Regulator; Adjustable and Fixed 3.3 V/ 5 V/ 12 VAnalog Devices
Analog Devices
ADP1110AN-33Micropower/ Step-Up/Step-Down Switching Regulator; Adjustable and Fixed 3.3 V/ 5 V/ 12 VAnalog Devices
Analog Devices

Número de piezaDescripciónFabricantes
SLA6805M

High Voltage 3 phase Motor Driver IC.

Sanken
Sanken
SDC1742

12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters.

Analog Devices
Analog Devices


DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares,
permitiéndote verlos en linea o descargarlos en PDF.


DataSheet.es    |   2020   |  Privacy Policy  |  Contacto  |  Buscar