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ADM1087AKS-REEL7 Scheda tecnica(PDF) 1 Page - Analog Devices |
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ADM1087AKS-REEL7 Scheda tecnica(HTML) 1 Page - Analog Devices |
1 / 16 page Simple Sequencers® in 6-Lead SC70 ADM1085/ADM1086/ADM1087/ADM1088 Rev. A Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.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 www.analog.com Fax: 781.461.3113 ©2006 Analog Devices, Inc. All rights reserved. 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/ADM1088) 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 CAPACITOR ADJUSTABLE DELAY 0.6V ADM1085/ADM1086 VIN ENOUT ENIN CEXT VCC GND CAPACITOR ADJUSTABLE DELAY 0.6V ADM1087/ADM1088 VIN ENOUT ENIN CEXT VCC GND Figure 1. GENERAL DESCRIPTION The ADM1085/ADM1086/ADM1087/ADM1088 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 and ADM1088 have push-pull output stages, with active high (ENOUT) and active low (ENOUT) logic outputs, respectively. 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 and ADM1088. 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 ADM1088 ENIN Push-pull |
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