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PDF ADP1109AAR-33 Data sheet ( Hoja de datos )
| Número de pieza | ADP1109AAR-33 | |
| Descripción | Micropower Low Cost Fixed 3.3 V/ 5 V/ 12 V and Adjustable DC-to-DC Converter | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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a
Micropower Low Cost
Fixed 3.3 V, 5 V, 12 V and Adjustable
DC-to-DC Converter
FEATURES
Operates at Supply Voltages 2 V to 9 V
Fixed 3.3 V, 5 V, 12 V and Adjustable Output
Minimum External Components Required
Ground Current: 460 A
Oscillator Frequency: 120 kHz
Logic Shutdown
8-Lead DIP and SO-8 Packages
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
GENERAL DESCRIPTION
The ADP1109A is a versatile step-up switching regulator. The
device requires only minimal external components to operate as
a complete switching regulator.
The ADP1109A-5 can deliver 100 mA at 5 V from a 3 V input
and the ADP1109A-12 can deliver 60 mA at 12 V from a 5 V
input. The device also features a logic controlled shutdown
capability that, when a logic low is applied, will shut down the
oscillator. The 120 kHz operating frequency allows for the use
of small surface mount components.
The gated oscillator capability eliminates the need for frequency
compensation.
ADP1109A
FUNCTIONAL BLOCK DIAGRAM
VIN SENSE
1.25V
REFERENCE
R2
250k⍀
ADP1109A-3.3: R1 = 152k⍀
ADP1109A-5: R1 = 83k⍀
ADP1109A-12: R1 = 29k⍀
COMPARATOR
SW
A1
R1
120kHz
OSCILLATOR
Q1
DRIVER
GND
SHUTDOWN
PGND
VIN FB
ADP1109A
1.25V
REFERENCE
COMPARATOR
SW
A1
120kHz
OSCILLATOR
Q1
DRIVER
GND
SHUTDOWN
PGND
TYPICAL APPLICATION
L1
33H
D1
3
VIN
1 VIN
SW SENSE 8
VOUT
5V 12V
ADP1109A-12
60mA
7 SHUTDOWN
PGND
GND
4
SHUTDOWN/PROGRAM
5
+ C1
22F
16V
Flash Memory VPP Generator
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: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 1997
1 page  
170
150
130
110
90
70
50
–40
0
25 70
85
TEMPERATURE – ؇C
Figure 6. Oscillator Frequency vs.
Temperature
68
65
62
59
56
53
–40
0 25 70
TEMPERATURE – ؇C
85
Figure 7. Duty Cycle vs. Temperature
0.60
0.55
0.50
VCE(SAT) @ VIN = 3V AND ISW = 0.65A
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
–40 0 25 70 85
TEMPERATURE – ؇C
Figure 9. Switch Saturation Voltage
vs. Temperature
6.0
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
–40
0
25 70 85
TEMPERATURE – ؇C
Figure 10. Switch-On Time vs.
Temperature
ADP1109A
1.4
1.2
1.0 VIN = 5V
0.8 VIN = 3V
0.6
0.4 VIN = 2V
0.2
0.0
0.1
0.2 0.4 0.6 0.8 1
ISWITCH CURRENT – A
1.2
Figure 8. Saturation Voltage vs.
ISWITCH Current in Step-Up Mode
600
550
500
450
400
350
300
250
–40
0 25 70
TEMPERATURE – ؇C
85
Figure 11. Quiescent Current vs.
Temperature
12.20
12.15
12.10
12.05
12.00
11.95
11.90
11.85
11.80
11.75
11.70
–40
0
25 70 85
TEMPERATURE – ؇C
Figure 12. 12 V Output Voltage vs.
Temperature
600
500
400
300
200
2 4 6 8 10 12 14 16 18 20
INPUT VOLTAGE – Volts
Figure 13. Quiescent Current vs.
Input Voltage
REV. 0
–5–
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet ADP1109AAR-33.PDF ] | |
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