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ADM1087:  Voltage Sequencer with Active Low, Open-Drain Enable Output

Product Details


The ADM1085-ADM1088 are Simple Sequencing™ circuits which provide a time delay between the enabling of voltage regulators at power-up in multiple supply systems. When the output voltage of the first regulator 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. By choosing appropriate resistor values, the threshold can be adjusted to monitor voltages as low as 0.6V.

The ADM1086 and ADM1088 have push-pull output stages, with active-high (ENOUT) and active-low (ENOUT) logic outputs, respectively. Similarly, the ADM1085 has an active-high (ENOUT) logic output and the ADM1087 has an active-low (ENOUT) output. Both the ADM1085 and ADM1087 have open-drain output stages which can be pulled up to voltage levels as high as 22V through an external resistor. This level shifting property of the ADM0185 and ADM1087 ensures compatibility with enable input logic levels of different regulators and converters.

All four models have a dedicated enable input pin which 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, and with low current consumption of 15µA (typ) and 6-lead SC70 packaging, they are suitable for low power portable applications.

FEATURES and BENEFITS

  • Provide time delays between enabling of regulators
  • Can be cascaded with regulators for multiple supply sequencing
  • Output stages
    High voltage (up to 22 V) open-drain output (ADM1085/ADM1087)
    Push-pull output (ADM1086/ADM1088)
  • Power supply monitoring from 0.6 V
  • Capacitor adjustable time delays
  • High voltage (up to 22 V) enable input
  • Low power consumption (15 µA)
  • Specified over –40°C to +125°C temperature range
  • 6-lead SC70 package

Functional Block Diagram for ADM1087

Documentation

Title Content Type File Type
ADM1085/ADM1086/ADM1087: Simple Sequencers® in 6-Lead SC70 Data Sheet (Rev B, 05/2014) (pdf, 285 kB) Data Sheets PDF
AN-1080: Power-Up and Power-Down Sequencing Using the ADM108x Simple Sequencer  (pdf, 384 kB) Application Notes PDF
AN-726: Triple-Supply Power-Good Indication with the ADM108x  (pdf, 75 kB) Application Notes PDF
UG-617: Evaluation Kit for ADM1087 Sequencer  (pdf, 205 kB) User Guides PDF
Temperature monitor measures three thermal zones
by Susan Pratt, Analog Devices, Inc. (EDN, 12/11/03)
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Voltage Monitoring and Sequencing (2009/2010)  (pdf) Overview PDF
Power System Management (Spring 2007)  (pdf, 1170 kB) Overview PDF
Power Supply Sequencing Bulletin (2007)  (pdf, 5188 kB) Solutions Bulletins PDF
RAQs index Rarely Asked Questions HTML
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The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

ADM1087 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
EVAL-ADM1087EBZ Status: Production Evaluation Board $151.80 Yes -

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.

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