Datasheet.kr   

ADP1109AAR PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 ADP1109AAR
기능 Micropower Low Cost Fixed 3.3 V/ 5 V/ 12 V and Adjustable DC-to-DC Converter
제조업체 Analog Devices
로고 Analog Devices 로고 


전체 8 페이지

		

No Preview Available !

ADP1109AAR 데이터시트, 핀배열, 회로
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




ADP1109AAR pdf, 반도체, 판매, 대치품
ADP1109A
VIN
3.3V
+
22F
20H*
MBRS130T3
3
SW
1 VIN
SENSE 8
ADP1109A-12
7 SHUTDOWN
GND PGND
54
+
SHUTDOWN
12V
60mA
33F**
25V
*COILTRONICS CTX20-1
SUMIDA CD54-220LC
**AVX TPS SERIES
Figure 1. 3.3 V Powered Flash Memory VPP Generator
VIN
2V +
22F
10H*
MBRS130T3
3
SW
1 VIN
SENSE 8
ADP1109A-12
7 SHUTDOWN
GND PGND
54
SHUTDOWN
12V
35mA
+ 33F**
25V
*COILTRONICS CTX10-1
SUMIDA CD54-100LC
**AVX TPS SERIES
Figure 2. 2 V Powered Flash Memory VPP Generator
2k
VIN
5V +
22F
10H*
MBRS130T3
3
SW
1 VIN
SENSE 8
ADP1109A-12
7 SHUTDOWN
GND PGND
54
+
SHUTDOWN
2N4403
47F**
20V
VOUT
12V
110mA
+
1F
*COILTRONICS CTX33-2
SUMIDA CD54-330LC
**AVX TPS SERIES
Figure 4. 5 V to 12 V Converter With Shutdown to 0 V at
Output
L1
33H*
MBRS130T3
3
VIN
SW
1 VIN
FB 8
3V ADP1109A
7 SHUTDOWN
GND GND
54
SHUTDOWN
R2
250k
VOUT
9V
R1 + C1
40.3k22F**
16V
*COILTRONICS CTX33-2
SUMIDA CD54-330LC
**AVX TPS SERIES
Figure 5. 3 V to 9 V Converter
VIN
2V +
22F
10H*
MBRS130T3
3
SW
1 VIN
SENSE 8
ADP1109A-5
7 SHUTDOWN
GND PGND
54
SHUTDOWN
5V
110mA
+ 33F**
10V
*COILTRONICS CTX10-1
SUMIDA CD54-100LC
**AVX TPS SERIES
Figure 3. 2 V to 5 V Converter
–4– REV. 0

4페이지










ADP1109AAR 전자부품, 판매, 대치품
ADP1109A
In practice, the inductor value is easily selected using the equa-
tions above. For example, consider a supply that will generate
12 V at 120 mA from a +5 V source. The inductor power re-
quired is, from Equation 1:
PL = (12 V + 0.5 V – 5 V) × (120 mA) = 900 mW
On each switching cycle, the inductor must supply:
PL = 900 mW = 7.5 µJ
f OSC 120 kHz
The required inductor power is fairly low in this example, so
the peak current can also be low. Assuming a peak current of
600 mA as a starting point, Equation 4 can be rearranged to
recommend an inductor value:
L = V IN t = 5 V 5.5 µs = 45.8 µH
IL(MAX ) 600 mA
Substituting a standard inductor value of 33 µH, with 0.2 dc
resistance, will produce a peak switch current of:
I PEAK
=
5V
1.0
 –1.0 Ω × 5.5 µs
1 e 33 µH

= 768 mA
Once the peak current is known, the inductor energy can be
calculated from Equation 5:
( ) ( )EL
=
1
2
33 µH
×
2
768 mA = 9.7 µJ
The inductor energy of 9.7 µJ is greater than the PL/fOSC re-
quirement of 7.5 µJ, so the 33 µH inductor will work in this
application. By substituting other inductor values into the same
equations, the optimum inductor value can be selected. When
selecting an inductor, the peak current must not exceed the
maximum switch current of 1.2 A. If the calculated peak current
is greater than 1.2 A, either the input voltage must be increased
or the load current decreased.
Output Voltage Selection
The output voltage is fed back to the ADP1109A via resistors
R1 and R2 (Figure 5). When the voltage at the comparator’s
inverting input falls below 1.25 V, the oscillator turns “on” and
the output voltage begins to rise. The output voltage is therefore
set by the formula:
VOUT
= 1.25 V
×
1
+
R2
R1 
Resistors R1 and R2 are provided internally on fixed-voltage
versions of the ADP1109A. In this case, a complete dc-dc con-
verter requires only four external components.
Capacitor Selection
For optimum performance, the ADP1109A’s output capacitor
must be carefully selected. Choosing an inappropriate capacitor
can result in low efficiency and/or high output ripple.
Ordinary aluminum electrolytic capacitors are inexpensive, but
often have poor Equivalent Series Resistance (ESR) and Equiva-
lent Series Inductance (ESL). Low ESR aluminum capacitors,
specifically designed for switch mode converter applications, are
also available, and these are a better choice than general purpose
devices. Even better performance can be achieved with tantalum
capacitors, although their cost is higher. Very low values of ESR
can be achieved by using OS-CON capacitors (Sanyo Corpora-
tion, San Diego, CA). These devices are fairly small, available
with tape-and-reel packaging, and have very low ESR.
Diode Selection
In specifying a diode, consideration must be given to speed,
forward voltage drop and reverse leakage current. When the
ADP1109A switch turns off, the diode must turn on rapidly if
high efficiency is to be maintained. Schottky rectifiers, as well as
fast signal diodes such as the 1N4148, are appropriate. The
forward voltage of the diode represents power that is not
delivered to the load, so VF must also be minimized. Again,
Schottky diodes are recommended. Leakage current is especially
important in low current applications, where the leakage can be
a significant percentage of the total quiescent current.
For most circuits, the 1N5818 is a suitable companion to the
ADP1109A. This diode has a VF of 0.5 V at 1 A, 4 µA to 10 µA
leakage, and fast turn-on and turn-off times. A surface mount
version, the MBRS130T3, is also available.
For switch currents of 100 mA or less, a Schottky diode such as
the BAT85 provides a VF of 0.8 V at 100 mA and leakage less
than 1 µA. A similar device, the BAT54, is available in an
SOT-23 package. Even lower leakage, in the 1 nA to 5 nA range,
can be obtained with a 1N4148 signal diode.
General purpose rectifiers, such as the 1N4001, are not suitable
for ADP1109A circuits. These devices, which have turn-on
times of 10 µs or more, are far too slow for switching power
supply applications. Using such a diode “just to get started” will
result in wasted time and effort. Even if an ADP1109A circuit
appears to function with a 1N4001, the resulting performance
will not be indicative of the circuit performance when the cor-
rect diode is used.
REV. 0
–7–

7페이지



구       성총 8 페이지
다운로드[ ADP1109AAR.PDF 데이터시트 ]
구매 문의
일반 IC 문의 : 샘플 및 소량 구매
-----------------------------------------------------------------------

전력 반도체 판매 ( IGBT, TR 모듈, SCR, 다이오드 모듈 )

휴대전화 : 010-3582-2743


상호 : 아이지 인터내셔날

전화번호 : 051-319-2877, [ 홈페이지 ]



링크공유

링크 :

관련 데이터시트

부품번호상세설명 및 기능제조사
ADP1109AAN

Micropower Low Cost Fixed 3.3 V/ 5 V/ 12 V and Adjustable DC-to-DC Converter

Analog Devices
Analog Devices
ADP1109AAN-12

Micropower Low Cost Fixed 3.3 V/ 5 V/ 12 V and Adjustable DC-to-DC Converter

Analog Devices
Analog Devices

추천 데이터시트

부품번호상세설명 및 기능제조사
CQ1565RT

FSCQ1565RT, Green Mode Fairchild Power Switch. In general, a Quasi-Resonant Converter (QRC) shows lower EMI and higher power conversion efficiency compared to conventional hard-switched converter with a fixed switching frequency.

Fairchild
Fairchild
KF16N25D

MOSFET의 기능은 N Channel MOS Field effect transistor입니다. This planar stripe MOSFET has better characteristics, such as fast switching time, low on resistance, low gate charge and excellent avalanche characteristics. It is mainly suitable for DC/DC Converters and switching mode power supplies.( Vdss=250V, Id=13A )

KEC
KEC

DataSheet.kr    |   2018   |  연락처   |  링크모음   |   검색  |   사이트맵