ADM6820 FET Drive Simple Sequencer™ w/Capacitor Adjustable Delay

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.

Applications
  • Multi-Voltage Systems
  • Dual Voltage Microprocessors/FPGAs/ASICs/DSPs/
  • Network Processors
  • Telecoms and Datacoms Systems
  • PC/Server Applications
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
Power Management
Data Sheets
Documentnote
ADM6819/ADM6820: FET Drive Simple Sequencers® Data Sheet (Rev. 0)PDF 208 kB
Order Information
Part NumberPackagePacking QtyTemp RangePrice 100-499Price 1000+RoHS
ADM6820ARJZ-REEL7 Production6 ld SOT-23REEL 3000-40 to 85C01.21Y
Reference Materials
ADM6819/ADM6820: FET Drive Simple Sequencers® Data Sheet (Rev. 0) adm6819
Supervisory Devices Complementary Parts Guide for Altera FPGAs adm690
Supervisory Devices Complementary Parts Guide for Xilinx FPGAs adm690
Power Supply Sequencing Bulletin (2007) adm1060