LTC1727/LTC1728 Micropower Precision Triple Supply Monitors in 8-Lead MSOP and 5-Lead SOT-23 Packages FEATURES DESCRIPTION n Monitors Three Inputs Simultaneously The LTC 1727 is a triple supply monitor intended for LTC1727-5: 5V, 3.3V and ADJ systems with multiple supply voltages. Each supply moni- LTC1727-2.5: 2.5V, 3.3V and ADJ tor has its own open-drain output for individual supply LTC1728-5: 5V, 3.3V and ADJ monitoring. A common open-drain reset output remains LTC1728-2.5: 2.5V, 3.3V and ADJ low until all three supplies have been in compliance for LTC1728-1.8: 3V, 1.8V and ADJ 200ms. Tight 1.5% accuracy specifications and glitch LTC1728-3.3: 3.3V, 1.8V and ADJ immunity ensure reliable reset operation without false n 1.5% Threshold Accuracy Over Temperature triggering. n Very Low Supply Current: 10A Typ The LTC1728 is functionally identical to the LTC1727 n 200ms Reset Time Delay without the individual monitor outputs. n Active Low RESET Output n The RST output is guaranteed to be in the correct state Power Supply Glitch Immunity n for V /V /V or V down to 1V. The LTC1727/ Guaranteed RESET for V 1V CC5 CC25 CC18 CC3 CC3 LTC1728 may also be configured to monitor any one or or V /V /V 1V CC5 CC25 CC18 n two V inputs instead of three, depending on system LTC1727 Includes Monitor Output for Each Supply CC n requirements. LTC1727: 8-Lead MSOP and SO Packages n LTC1728: 5-Lead SOT-23 Package Very low (10A typical) supply current makes the LTC1727/ LTC1728 ideal for power conscious systems. APPLICATIONS The LTC1727 is available in an 8-lead MSOP or SO pack- n Desktop Computers age and the LTC1728 is available in a 5-lead SOT-23 n Notebook Computers package. n All registered trademarks and trademarks are the property of their respective owners. Intelligent Instruments n Portable Battery-Powered Equipment n Network Servers TYPICAL APPLICATION 3.3V Triple Supply Monitor with Power Good Output DC/DC 5V SYSTEM CONVERTER LOGIC 1.8V (3.3V, 2.5V and Adjustable) LTC1727-2.5 10k 10k V RST CC3 POWER 3.3V V COMP3 CC3 GOOD LTC1728-5 2.5V V COMP25 CC25 V CC5 R1 0.1F ADJUSTABLE SYSTEM 61.9k V RST CCA SUPPLY RESET 1% 0.1F V GND CCA R2 GND COMPA 100k 1727/28 TA08 1727/28 TA01 1% Rev. E 1 Document Feedback For more information www.analog.comLTC1727/LTC1728 ABSOLUTE MAXIMUM RATINGS (Notes 1, 2) V , V /V /V , V 0.3V to 7V Operating Temperature Range CC3 CC5 CC25 CC18 CCA ........................ RST ............................................................. 0.3V to 7V LTC1727/LTC1728E (Note 3) ............... 40C to 85C COMPA, COMP3, COMP25/COMP5 LTC1728H .......................................... 40C to 125C (MS8 and SO-8 Only) ............................. 0.3V to 7V LTC1727I.............................................. 40C to 85C Storage Temperature Range .................. 65C to 150C Lead Temperature (Soldering, 10 sec) .................. 300C PIN CONFIGURATION TOP VIEW V 1 8 COMP3 TOP VIEW CC3 TOP VIEW V / COMP25/ CC5 2 7 RST 1 5 V V COMP5 CC3 V 1 8 COMP3 CC25 CC3 V /V 2 7 COMP25/COMP5 V 3 6 RST CCA GND 2 CC5 CC25 V / CC5 V 3 6 RST CCA V 3 4 V / GND 4 5 COMPA CC25 CCA GND 4 5 COMPA V CC18 MS8 PACKAGE S8 PACKAGE S5 PACKAGE 8-LEAD PLASTIC MSOP 8-LEAD PLASTIC SO 5-LEAD PLASTIC SOT-23 T = 125C, = 200C/W T = 125C, = 150C/W T = 125C, = 250C/W JMAX JA JMAX JA JMAX JA ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC1727EMS8-2.5 PBF LTC1727EMS8-2.5 TRPBF LTHY 8-Lead Plastic MSOP 40C to 85C LTC1727EMS8-5 PBF LTC1727EMS8-5 TRPBF LTHX 8-Lead Plastic MSOP 40C to 85C LTC1727ES8-2.5 PBF LTC1727ES8-2.5 TRPBF 172725 8-Lead Plastic SO 40C to 85C LTC1727IS8-2.5 PBF LTC1727IS8-2.5 TRPBF 727I25 8-Lead Plastic SO 40C to 85C LTC1727ES8-5 PBF LTC1727ES8-5 TRPBF 17275 8-Lead Plastic SO 40C to 85C LTC1727IS8-5 PBF LTC1727IS8-5 TRPBF 1727I5 8-Lead Plastic SO 40C to 85C LTC1728ES5-1.8 PBF LTC1728ES5-1.8 TRPBF LTPH 8-Lead Plastic SOT-23 40C to 85C LTC1728ES5-2.5 PBF LTC1728ES5-2.5 TRPBF LTIA 8-Lead Plastic SOT-23 40C to 85C LTC1728ES5-3.3 PBF LTC1728ES5-3.3 TRPBF LTYP 8-Lead Plastic SOT-23 40C to 85C LTC1728ES5-5 PBF LTC1728ES5-5 TRPBF LTHZ 8-Lead Plastic SOT-23 40C to 85C LTC1728HS5-5 PBF LTC1728HS5-5 TRPBF LTHZ 8-Lead Plastic SOT-23 40C to 125C Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with TRMPBF suffix. Rev. E 2 For more information www.analog.com