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

Part#	# Supplies Monitored	Volt Monitoring Accuracy	# Output Drivers	FET Drive/Enable Output	Voltage Readback	Supply Adj/Margining	Programming Method	Temp Sensor	Package	Price* (1000-4999)
ADM1060	7	2.5%	9	Both	-	-	SMBus	-	28 ld TSSOP	$6.58
ADM1062	10	1%	10	Both	12-bit ADC	12-bit ADC+6 DACs	SMBus	1 External, 1 Internal	40 ld LFCSP , 48 ld TQFP	$7.59
ADM1063	10	1%	10	Both	12-bit ADC	-	SMBus	1 Internal, 2 External	40 ld LFCSP , 48 ld TQFP	$8.35
ADM1064	10	1%	10	Both	12-bit ADC	-	SMBus	-	40 ld LFCSP , 48 ld TQFP	$7.84
ADM1065	10	1%	10	Both	-	-	SMBus	-	40 ld LFCSP , 48 ld TQFP	$5.82
ADM1066	12	1%	10	Both	12-bit ADC	12-bit ADC+6 DACs	SMBus	-	40 ld LFCSP , 48 ld TQFP	$8.60
ADM1067	10	1%	10	Both	-	6 DACs	SMBus	-	40 ld LFCSP , 48 ld TQFP	$6.58
ADM1068	8	1%	8	Both	-	-	SMBus	-	32 ld LQFP	$4.05
ADM1069	8	1%	8	Both	12-bit ADC	12-bit ADC+4 DACs	SMBus	-	32 ld LQFP	$4.40
ADM1085	Cascadeable	7%	1	Enable	-	-	Analog	-	6 ld SC70	$0.34
ADM1086	Cascadeable	7%	1	Enable	-	-	Analog	-	6 ld SC70	$0.34
ADM1087	Cascadeable	7%	1	Enable	-	-	Analog	-	6 ld SC70	$0.34
ADM1088	Cascadeable	-	1	Enable	-	-	Analog	-	6 ld SC70	-
ADM1184	4	-	4	Enable	-	-	Analog	-	-	$2.42
ADM1185	4	0.8%	4	Enable	-	-	Analog	-	10-Lead MSOP	$1.21
ADM1186	4	0.8%	4	-	-	-	Analog	-	-	$3.02
ADM6819	2	2.6%	1	FET Drive	-	-	Analog	-	6-ld SOT-23	$1.21
ADM6820	2	2.6%	1	FET Drive	-	-	Analog	-	6-ld SOT-23	$1.21

* The pricing listed here is provided only for budgetary purposes as recommended list price in U.S. Dollars in the United States ex factor per unit for the stated volume. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
** Pricing is currently unavailable. Click on the product number to see the Product Page for additional information.

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