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ADM1087 데이터시트 PDF




Analog Devices에서 제조한 전자 부품 ADM1087은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


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부품번호 ADM1087 기능
기능 Simple Sequencers in 6-Lead SC70
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ADM1087 데이터시트, 핀배열, 회로
Data Sheet
Simple Sequencers® in 6-Lead SC70
ADM1085/ADM1086/ADM1087
FEATURES
Provide programmable time delays between enable
signals
Can be cascaded with power modules for multiple
supply sequencing
Power supply monitoring from 0.6 V
Output stages
High voltage (up to 22 V) open-drain output
(ADM1085/ADM1087)
Push-pull output (ADM1086)
Capacitor-adjustable time delays
High voltage (up to 22 V) enable and VIN inputs
Low power consumption (15 μA)
Specified over –40°C to +125°C temperature range
6-lead SC70 package
APPLICATIONS
Desktop/notebook computers, servers
Low power portable equipment
Routers
Base stations
Line cards
Graphics cards
FUNCTIONAL BLOCK DIAGRAMS
VCC
ADM1085/ADM1086
VIN
0.6V
CAPACITOR
ADJUSTABLE
DELAY
ENOUT
GND
CEXT
ENIN
ADM1087
VIN
0.6V
VCC
CAPACITOR
ADJUSTABLE
DELAY
ENOUT
GND
CEXT
ENIN
Figure 1.
GENERAL DESCRIPTION
The ADM1085/ADM1086/ADM1087 are simple sequencing
circuits that provide a time delay between the enabling of
voltage regulators and/or dc-dc converters at power-up in
multiple supply systems. When the output voltage of the first
power module reaches a preset threshold, a time delay is
initiated before an enable signal allows subsequent regulators to
power up. Any number of these devices can be cascaded with
regulators to allow sequencing of multiple power supplies.
Threshold levels can be set with a pair of external resistors in a
voltage divider configuration. With appropriate resistor values,
the threshold can be adjusted to monitor voltages as low as 0.6 V.
The ADM1086 has a push-pull output stage, with active high
(ENOUT). The ADM1085 has an active-high (ENOUT) logic
output; the ADM1087 has an active-low (ENOUT) output. Both
the ADM1085 and ADM1087 have open-drain output stages
that can be pulled up to voltage levels as high as 22 V through
an external resistor. This level-shifting property ensures
compatibility with enable input logic levels of different
regulators and converters.
All four models have a dedicated enable input pin that allows
the output signal to the regulator to be controlled externally.
This is an active high input (ENIN) for the ADM1085 and
ADM1086, and an active low input (ENIN) for the ADM1087.
The Simple Sequencers are specified over the extended
−40°C to +125°C temperature range. With low current
consumption of 15 μA (typical) and 6-lead SC70 packaging,
the parts are suitable for low-power portable applications.
Table 1. Selection Table
Part No.
Enable Input
Output Stage
ENOUT
ENOUT
ADM1085
ENIN
Open-drain
ADM1086
ENIN
Push-pull
ADM1087
ENIN
Open-drain
Rev. B
Document Feedback
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 that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2004–2014 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com




ADM1087 pdf, 반도체, 판매, 대치품
ADM1085/ADM1086/ADM1087
ABSOLUTE MAXIMUM RATINGS
TA = 25°C, unless otherwise noted.
Table 3.
Parameter
VCC
VIN
CEXT
ENIN, ENIN
ENOUT, ENOUT (ADM1085, ADM1087)
ENOUT, ENOUT (ADM1086)
Operating Temperature Range
Storage Temperature Range
θJA Thermal Impedance, SC70
Lead Temperature
Soldering (10 sec)
Vapor Phase (60 sec)
Infrared (15 sec)
Rating
0.3 V to +6 V
0.3 V to +25 V
0.3 V to +6 V
0.3 V to +25 V
0.3 V to +25 V
0.3 V to +6 V
40°C to +125°C
65°C to +150°C
146°C/W
300°C
215°C
220°C
Data Sheet
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
ESD CAUTION
Rev. B | Page 4 of 16

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ADM1087 전자부품, 판매, 대치품
Data Sheet
120
100
80
60
40
20
0
2.1 2.4 2.7 3.0 3.3 3.6
SUPPLY VOLTAGE (V)
Figure 9. Output Low Voltage vs. Supply Voltage
100
90
80
70
60
1mV/µs
50
40
10mV/µs
30
20
10
0
–40 –25 –10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
Figure 10. VCC Falling Propagation Delay vs. Temperature
500
450
400
350
300
250
200
150
100
50
0
2.1
2.4 2.7 3.0 3.3
SUPPLY VOLTAGE (V)
3.6
Figure 11. Output Fall Time vs. Supply Voltage
ADM1085/ADM1086/ADM1087
200
180
TA = +125°C
160
TA = +25°C
140
120
100
TA = –40°C
80
60
40
20
0
0 2 4 6 8 10 12 14 16 18 20 22
ENIN/ENIN (V)
Figure 12. ENIN/ENINLeakage Current vs. ENIN/ENINVoltage
200
TA = +125°C
180
160
TA = +25°C
140
120 TA = –40°C
100
80
60
40
20
0
2.1 2.4 2.7 3.0 3.3 3.6
VCC (V)
Figure 13. ENIN/ENINLeakage Current vs. VCC Voltage
10000
1000
100
10
1
0.1
0.562 2.390 5.02
22.9 53.2 241 520
TIMEOUT DELAY (ms)
2350 4480 26200
Figure 14. CEXT Capacitance vs. Timeout Delay
Rev. B | Page 7 of 16

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