0.8% Accurate Quad Voltage Monitor ADM1184 FEATURES FUNCTIONAL BLOCK DIAGRAM VCC Powered from 2.7 V to 5.5 V on the VCC pin Monitors 4 supplies via 0.8% accurate comparators POWER AND REF = 0.6V 4 inputs can be programmed to monitor different voltage REFERENCE ADM1184 GENERATOR levels with external resistor dividers OUT1 3 open-drain enable outputs (OUT1, OUT2, and OUT3) VIN1 REF = 0.6V Open-drain power-good output (PWRGD) Internal 190 ms delay associated with assertion of PWRGD OUT2 VIN2 10-lead MSOP REF = 0.6V APPLICATIONS INTERNAL OUT3 LOGIC VIN3 Monitor and alarm functions REF = 0.6V Telecommunications PWRGD Microprocessor systems VIN4 PC/servers REF = 0.6V GND Figure 1. GENERAL DESCRIPTION The ADM1184 is an integrated, 4-channel voltage-monitoring OUT1 to OUT3 are dependent on their associated VINx input device. A 2.7 V to 5.5 V power supply is required on the VCC pin (that is, VIN1, VIN2, or VIN3). If a supply monitored by VINx to power the device. drops below its programmed threshold, the associated OUTx pin and PWRGD are disabled. Four precision comparators monitor four voltage rails. Each comparator has a 0.6 V reference with a worst-case PWRGD is a common power-good output indicating the status accuracy of 0.8%. Resistor networks that are external to the of all monitored supplies. There is an internal 190 ms (typical) VIN1, VIN2, VIN3, and VIN4 pins set the trip points for delay associated with the assertion of the PWRGD output. If the monitored supply rails. VIN1, VIN2, VIN3, or VIN4 drops below its programmed threshold, PWRGD is deasserted immediately. The ADM1184 has four open-drain outputs. OUT1 to OUT3 can be used to enable power supplies, and PWRGD is a The ADM1184 is available in a 10-lead mini small outline common power-good output. package (MSOP). Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 www.analog.com license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Fax: 781.461.3113 2008 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. 07352-001ADM1184 TABLE OF CONTENTS Features .............................................................................................. 1 Pin Configuration and Function Descriptions..............................5 Applications....................................................................................... 1 Typical Performance Characteristics ..............................................6 Functional Block Diagram .............................................................. 1 Theory of Operation .........................................................................9 General Description ......................................................................... 1 Input Configuration......................................................................9 Revision History ............................................................................... 2 Output Configuration...................................................................9 Specifications..................................................................................... 3 Voltage Monitoring and Sequencing Application.................. 11 Absolute Maximum Ratings............................................................ 4 Outline Dimensions ....................................................................... 12 Thermal Resistance ...................................................................... 4 Ordering Guide .......................................................................... 12 ESD Caution.................................................................................. 4 REVISION HISTORY 2/08Revision 0: Initial Version Rev. 0 Page 2 of 12