ADM6819

www.DataSheet4U.com FET Drive Simple Sequencers® ADM6819/ADM6820 FEATURES Single chip enables power supply sequencing of two supplies On-board charge pump fully enhances N-channel FET Adjustable primary supply monitor to 0.618 V Delay from primary supply to secondary supply enabled Fixed 300 ms delay (ADM6819) Capacitor adjustable delay (ADM6820) Logic/analog driven enable input (ADM6819) −40°C to +85°C operating range Packaged in small 6-lead SOT-23 package Pin-to-pin compatibility with MAX6819/MAX6820 VCC1 VCC2 VCC1 VCC2 CHARGE PUMP UVLO R1 SETV 0.618V LOGIC FET DRIVER GATE VFET FUNCTIONAL BLOCK DIAGRAM Q1 VCC1 VCC2 OUT R2 TIMER ADM6819/ ADM6820 0.618V Multivoltage systems Dual voltage microprocessors/FPGAs/ASICs/DSPs Network processors Telecom and datacom systems PC/server applications EN (ADM6819) - DIGITAL/ANALOG SETD (ADM6820) Figure 1. GENERAL DESCRIPTION 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. When more than two voltages require sequencing, multiple ADM6819/ADM6820 devices can be cascaded to achieve this. The devices operate over a supply range of 2.95 V to 5.5 V. 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 ...