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ADM6820ARJZ-REEL7 Datasheet(PDF) 1 Page - Analog Devices |
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ADM6820ARJZ-REEL7 Datasheet(HTML) 1 Page - Analog Devices |
1 / 12 page FET Drive Simple Sequencers® ADM6819/ADM6820 Rev. 0 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 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 APPLICATIONS Multivoltage systems Dual voltage microprocessors/FPGAs/ASICs/DSPs Network processors Telecom and datacom systems PC/server applications FUNCTIONAL BLOCK DIAGRAM VCC2 VCC2OUT Q1 GATE LOGIC VCC2 VFET SETV EN (ADM6819) - DIGITAL/ANALOG SETD (ADM6820) 0.618V 0.618V GND R1 R2 VCC1 ADM6819/ ADM6820 VCC1 VCC1 FET DRIVER CHARGE PUMP TIMER UVLO 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 primary supply. When the voltage at the VSET pin rises above the comparator threshold, an internal charge pump on the GATE output enhances the secondary supply FET. The ADM6819 features an enable (EN) pin that 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 enables the GATE only if both supplies are valid. When both inputs of the internal comparators are above the threshold, a fixed 300 ms timeout occurs before the GATE is driven high and the secondary supply is enabled. The ADM6820 has only one comparator that is on the SETV pin. It also features a timeout period that is adjustable via a single external capacitor on the SETD pin. The ADM6819/ADM6820 are packaged in small 6-lead SOT-23 packages. |
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