Quad Voltage Up and Down Sequencer and Monitor with Programmable Timing Data Sheet ADM1186 FEATURES GENERAL DESCRIPTION Powered from 2.7 V to 5.5 V on the VCC pin The ADM1186-1 and ADM1186-2 are integrated, four-channel Monitors four supplies via 0.8% accurate comparators voltage monitoring and sequencing devices. A 2.7 V to 5.5 V Digital core supports up and down supply sequencing power supply is required on the VCC pin for power. Multiple devices can be cascaded (ADM1186-1) Four precision comparators, VIN1 to VIN4, monitor four Four inputs can be programmed to monitor different voltage voltage rails. All four comparators share a 0.6 V reference and levels with resistor dividers have a worst-case accuracy of 0.8%. Resistor networks that are Capacitor programmable supply sequence time delays external to the VIN1, VIN2, VIN3, and VIN4 pins set the and a timeout delay to 5% accuracy at 25C undervoltage (UV) trip points for the monitored supply rails. Four open-drain enable outputs The ADM1186-1 and ADM1186-2 have four open-drain enable Open-drain power-good output outputs, OUT1 to OUT4, that are used to enable power supplies. Open-drain sequence complete pin and bidirectional An open-drain power-good output, PWRGD, indicates whether open-drain fault pin (ADM1186-1 only) the four VINx inputs are above their UV thresholds. APPLICATIONS DOWN A state machine monitors the state of the UP and pins Monitor and alarm functions DOWN on the ADM1186-1 or the UP/ pin on the ADM1186-2 Up and down power supply sequencing to control the supply sequencing direction (see Figure 2). In the Telecommunication and data communication equipment WAIT START state, a rising edge transition on the UP or PCs, servers, and notebook PCs UP/DOWN pin triggers a power-up sequence. A falling edge transition on the DOWN or UP/DOWN pin in the POWER-UP DONE state triggers a power-down sequence. APPLICATION DIAGRAM 5V 5V IN ADP1706 2.5V EN OUT 5V 5V IN ADP2107 1.8V EN OUT 3.3V AUX 3.3V AUX IN 3.3V AUX ADP1821 1.2V EN OUT 1F 5V 5V IN ADP1706 3.3V 100nF EN OUT 3.3V AUX VCC OUT1 OUT2 OUT3 OUT4 FAULT VIN1 VIN2 UP SEQUENCE CONTROL VIN3 DOWN VIN4 ADM1186-1 DLY EN OUT1 2.5V AUX DLY EN OUT2 DLY EN OUT3 3.3V AUX PWRGD DLY EN OUT4 BLANK DLY GND SEQ DONE Figure 1. Rev. B Document Feedback 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 20082013 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. 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Technical Support www.analog.com 07153-003ADM1186 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Power-Up Sequencing and Monitoring................................... 13 Applications ....................................................................................... 1 Operation in POWER-UP DONE State .................................. 14 General Description ......................................................................... 1 Power-Down Sequencing and Monitoring ............................. 14 Application Diagram ........................................................................ 1 Input Glitch Filtering ................................................................. 14 Revision History ............................................................................... 2 Fault Conditions and Fault Handling ...................................... 14 Specif icat ions ..................................................................................... 4 Defining Time Delays ................................................................ 15 Absolute Maximum Ratings ............................................................ 6 Sequence Control Using a Supply Rail .................................... 16 ESD Caution .................................................................................. 6 Automatic Startup and Automatic Retry Using a Supply Rail ... 17 Pin Configurations and Function Descriptions ........................... 7 Cascading Multiple Devices .......................................................... 24 Typical Performance Characteristics ............................................. 9 Outline Dimensions ....................................................................... 27 Theory of Operation ...................................................................... 13 Ordering Guide .......................................................................... 27 UVLO Behavior .......................................................................... 13 REVISION HISTORY 4/13Rev. A to Rev. B Added Automatic Startup and Automatic Retry Using a Supply Rail Section and Figure 28 Renumbered Sequentially ............. 17 6/09Rev. 0 to Rev. A Changes to Sequence Control Using a Supply Rail Section ...... 16 5/08Revision 0: Initial Version Rev. B Page 2 of 28