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ADM1085AKSZ-REEL7

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
Simple Sequencers
®
in 6-Lead SC70
Data Sheet
ADM1085
/
ADM1086
/
ADM1087
Rev. B Document Feedback
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Technical Support www.analog.com
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 V
IN
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
CAPACITOR
ADJUSTABLE
DELAY
0.6V
ADM1085/ADM1086
V
IN
ENOUT
ENINCEXT
V
CC
GND
CAPACITOR
ADJUSTABLE
DELAY
0.6V
ADM1087
V
IN
ENOUT
ENINCEXT
V
CC
GND
04591-001
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
Output Stage
Part No. Enable Input
ENOUT
ENOUT
ADM1085 ENIN
Open-drain
ADM1086 ENIN
Push-pull
ADM1087
ENIN
Open-drain
ADM1085/ADM1086/ADM1087 Data Sheet
Rev. B | Page 2 of 16
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Functional Block Diagrams ............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Absolute Maximum Ratings ............................................................ 4
ESD Caution .................................................................................. 4
Pin Configuration and Function Descriptions ............................. 5
Typical Performance Characteristics ............................................. 6
Circuit Information .......................................................................... 9
Timing Characteristics and Truth Tables .................................. 9
Capacitor-Adjustable Delay Circuit ............................................9
Open-Drain and Push-Pull Outputs ....................................... 10
Application Information ................................................................ 11
Sequencing Circuits ................................................................... 11
Dual LOFO Sequencing ............................................................ 13
Simultaneous Enabling .............................................................. 13
Power Good Signal Delays ........................................................ 13
Quad-Supply Power Good Indicator ....................................... 14
Sequencing with FET Switches ................................................. 14
Outline Dimensions ....................................................................... 15
Ordering Guide .......................................................................... 15
REVISION HISTORY
5/14—Rev. A to Rev. B
Removed ADM1088 ...................................................... Throughout
Changes to Capacitor-Adjustable Delay Circuit........................... 9
Removed Figure 26; Renumbered Sequentially.......................... 12
Changes to Ordering Guide .......................................................... 15
4/06—Rev. 0 to Rev. A
Added Lead-Free Models .................................................. Universal
Update Outline Dimensions ......................................................... 15
Changes to Ordering Guide .......................................................... 15
7/04—Revision 0: Initial Version
Data Sheet ADM1085/ADM1086/ADM1087
Rev. B | Page 3 of 16
SPECIFICATIONS
V
CC
= full operating range, T
A
= −40°C to +125°C, unless otherwise noted.
Table 2.
Parameter Min Typ Max Unit Test Conditions/Comments
SUPPLY
V
CC
Operating Voltage Range 2.25 3.6 V
V
IN
Operating Voltage Range 0 22 V
Supply Current 10 15 μA
V
IN
Rising Threshold, V
TH_RISING
0.56 0.6 0.64 V V
CC
= 3.3 V
V
IN
Falling Threshold, V
TH_FALLING
0.545 0.585 0.625 V V
CC
= 3.3 V
V
IN
Hysteresis 15 mV
V
IN
to ENOUT/ENOUT Delay
V
IN
Rising 35 μs CEXT floating, C = 20 pF
2 ms CEXT = 470 pF
V
IN
Falling 20 μs V
IN
= V
TH_FALLING
to (V
TH_FALLING
− 100 mV)
V
IN
Leakage Current 170 μA V
IN
= 22 V
CEXT Charge Current 125 250 375 nA
Threshold Temperature Coefficient 30 ppm/°C
ENIN/ENIN to ENOUT/ENOUT
Propagation Delay
0.5 μs V
IN
> V
TH_RISING
ENIN/ENIN Voltage Low
0.3 V
CC
− 0.2 V
ENIN/ENIN Voltage High
0.3 V
CC
+ 0.2 V
ENIN/ENIN Leakage Current
170 μA
ENIN/ENIN = 22 V
ENOUT/ENOUT Voltage Low
0.4 V
V
IN
< V
TH_FALLING
(ENOUT),
V
IN
> V
TH_RISING
(ENOUT),
I
SINK
= 1.2 mA
ENOUT/ENOUT Voltage High
(ADM1086)
0.8 V
CC
V
V
IN
> V
TH_RISING
(ENOUT),
V
IN
< V
TH_FALLING
(ENOUT),
I
SOURCE
= 500 μA
ENOUT/ENOUT Open-Drain Output
Leakage Current (ADM1085/ADM1087)
0.4 μA
ENOUT/ENOUT = 22 V
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

ADM1085AKSZ-REEL7

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Manufacturer:
Analog Devices Inc.
Description:
Supervisory Circuits VTG Seq w/ Open Drain Enable Out
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