0.8% Accurate Quad Voltage Monitor ADM1184
FEATURES
Powered from 2.7 V to 5.5 V on the VCC pin Monitors 4 supplies via 0.8% accurate comparators 4 inputs can be programmed to monitor different voltage levels with external resistor dividers 3 open-drain enable outputs (OUT1, OUT2, and OUT3) Open-drain power-good output (PWRGD) Internal 190 ms delay associated with assertion of PWRGD 10-lead MSOP FUNCTIONAL BLOCK DIAGRAM
VCC POWER AND REF = 0.6V REFERENCE GENERATOR OUT1 VIN1 REF = 0.6V OUT2 VIN2 REF = 0.6V ADM1184 APPLICATIONS
Monitor and alarm functions Telecommunications Microprocessor systems PC/servers
VIN3 REF = 0.6V INTERNAL LOGIC OUT3 PWRGD VIN4 REF = 0.6V
07352-001 GND Figure 1. GENERAL DESCRIPTION
The ADM1184 is an integrated, 4-channel voltage-monitoring device. A 2.7 V to 5.5 V power supply is required on the VCC pin to power the device. Four precision comparators monitor four voltage rails. Each comparator has a 0.6 V reference with a worst-case accuracy of 0.8%. Resistor networks that are external to the VIN1, VIN2, VIN3, and VIN4 pins set the trip points for the monitored supply rails. The ADM1184 has four open-drain outputs. OUT1 to OUT3 can be used to enable power supplies, and PWRGD is a common power-good output. OUT1 to OUT3 are dependent on their associated VINx input (that is, VIN1, VIN2, or VIN3). If a supply monitored by VINx drops below its programmed threshold, the associated OUTx pin and PWRGD are disabled. PWRGD is a common power-good output indicating the status of all monitored supplies. There is an internal 190 ms (typical) delay associated with the assertion of the PWRGD output. If VIN1, VIN2, VIN3, or VIN4 drops below its programmed threshold, PWRGD is deasserted immediately. The ADM1184 is available in a 10-lead mini small outline 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 rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. 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 ©2008 Analog Devices, Inc. All rights reserved. ADM1184 TABLE OF CONTENTS
Features . 1 Applications. 1 Functional Block Diagram . 1 General Description . 1 Revision History . 2 Specific …
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