Features and Benefits

  • Single Chip Enables Power Supply Sequencing of Two Supplies
  • On Board Charge Pump Fully Enhances N Channel FET
  • Adjustable Primary Supply Monitor Monitors Down to 0.62V
  • Delay From Primary Supply Good to Secondary Supply
  • Enabled Capacitor Adjustable Delay
  • -40°C to +85°C Operating Range
  • Packaged in Small 6 Lead SOT-23 Package
  • Pin for Pin Compatible with MAX6819/MAX6820

Product Details

The ADM6819 and ADM6820 are simple power supply sequencers with FET drive capability for enhancing N Channel MOSFETs. These devices can monitor a primary supply voltage and enable/disable an external N-channel FET for a secondary supply. The ADM6819 has the ability to monitor two supplies. Where more than two voltages require sequencing multiple ADM6819/20 devices can be cascaded to achieve this. The devices operate over a supply range of 2.7V to 5.5V.

An internal comparator monitors the primary supply using the VSET pin. The input to this comparator is externally set via a resistor divider from the primary supply. When the voltage at the VSET pin rises above the comparator threshold, the secondary supply FET will be enhanced by an internal charge pump on the GATE output. The ADM6819 features an Enable (EN) pin which is fed to the input of an additional comparator and reference circuit. This pin can be used as a digital enable or a secondary power good comparator to monitor a second supply and only enable the GATE if both supplies are valid. When both the internal comparators inputs are above the threshold, a fixed 200ms timeout will occur before the GATE is driven high and the secondary supply is enabled.

The ADM6820 has only one comparator which is on the SETV pin and features a timeout period which is adjustable via a single external capacitor on the SETD pin. The ADM6819/20 are packaged in small 6-pin SOT-23 packages.


  • Multi-Voltage Systems
  • Dual Voltage Microprocessors/FPGAs/ASICs/DSPs/
  • Network Processors
  • Telecoms and Datacoms Systems
  • PC/Server Applications

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

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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.

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