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Simple Sequencers in 6-Lead SC70



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Analog Devices
ADM1085 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
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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.
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Tel: 781.329.4700 ©2004–2014 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com


ADM1085 데이터시트, 핀배열, 회로
ADM1085/ADM1086/ADM1087
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 
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
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 
Rev. B | Page 2 of 16




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