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ADM1088

Description
Simple Sequencers in 6-Lead SC70
File Size360KB,16 Pages
ManufacturerADI
Websitehttps://www.analog.com
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ADM1088 Overview

Simple Sequencers in 6-Lead SC70

Data Sheet
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
Simple Sequencers
®
in 6-Lead SC70
ADM1085/ADM1086/ADM1087
FUNCTIONAL BLOCK DIAGRAMS
V
CC
ADM1085/ADM1086
V
IN
0.6V
CAPACITOR
ADJUSTABLE
DELAY
ENOUT
GND
CEXT
ENIN
V
CC
ADM1087
V
IN
CAPACITOR
ADJUSTABLE
DELAY
APPLICATIONS
Desktop/notebook computers, servers
Low power portable equipment
Routers
Base stations
Line cards
Graphics cards
0.6V
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.
Rev. B
Document Feedback
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
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.
ADM1085
ADM1086
ADM1087
Enable Input
ENIN
ENIN
ENIN
Open-drain
Output Stage
ENOUT
ENOUT
Open-drain
Push-pull
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.
Trademarks and registered trademarks are the property of their respective owners.
04591-001

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