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ADM1086 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADM1086
Beschreibung Simple Sequencers in 6-Lead SC70
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 16 Seiten
ADM1086 Datasheet, Funktion
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
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Technical Support
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ADM1086 Datasheet, Funktion
ADM1085/ADM1086/ADM1087
TYPICAL PERFORMANCE CHARACTERISTICS
700
680
660
640
VTRIP RISING
620
600
580
560
VTRIP FALLING
540
520
500
–40
–25 –10 5 20 35 50 65 80 95
TEMPERATURE (°C)
Figure 3. VIN Threshold vs. Temperature
110 125
12.0
11.5
TA = +25°C
11.0
10.5
10.0
TA = –40°C TA = +125°C
9.5
9.0
8.5
8.0
2.1
2.4 2.7 3.0 3.3
VCC (V)
Figure 4. Supply Current vs. Supply Voltage
3.6
20
18
16
14
12
10
8
6
4
2
0
0 2 4 6 8 10 12 14 16 18 20 22
VIN (V)
Figure 5. Supply Current vs. VIN Voltage
Data Sheet
200
180
160
140
120
100
80
60
40
20
0
0
TA = +125°C
TA = +25°C
TA = –40°C
2 4 6 8 10 12 14 16 18 20
VIN (V)
Figure 6. VIN Leakage Current vs. VIN Voltage
22
200
190
TA = +125°C
180
170
160 TA = +25°C
150
140
TA = –40°C
130
120
110
100
2.1
2.4 2.7 3.0 3.3
VCC (V)
Figure 7. VIN Leakage Current vs. VCC Voltage
3.6
10000
TA = +125°C
1000
100
10
TA = +25°C
TA = –40°C
1
0.1
0.01 0.1 1 10 20
OUTPUT SINK CURRENT (mA)
Figure 8. Output Voltage vs. Output Sink Current
100
Rev. B | Page 6 of 16

6 Page









ADM1086 pdf, datenblatt
ADM1085/ADM1086/ADM1087
Data Sheet
12V
IN
EN DC/DC OUT
3.3V
3.3V
IN
EN DC/DC OUT
2.5V
3.3V
IN
EN DC/DC OUT
1.8V
3.3V
IN
EN DC/DC OUT 1.2V
VCC
VIN ENOUT
ADM1086
ENIN CEXT
VCC
VIN ENOUT
ADM1086
ENIN CEXT
VCC
VIN ENOUT
ADM1086
ENIN CEXT
ENABLE
CONTROL
12V
3.3V
2.5V
1.8V
1.2V
tEN1
tEN2
tEN3
EXTERNAL
DISABLE
Figure 24. Typical ADM1086 Application Circuit
12V
IN
SD ADP3334 OUT
3.3V
3.3V
IN
SD ADP3334 OUT 2.5V
VCC
VIN ENOUT
ADM1087
ENIN CEXT
Figure 25. Typical ADM1087 Application Circuit Using
ADP3334 Voltage Regulators
Rev. B | Page 12 of 16

12 Page





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