LTC2911 Precision Triple Supply Monitor with Power-Fail Comparator FEATURES DESCRIPTION n Ultralow Voltage Reset: V = 0.5V Guaranteed The LTC 2911 is a low power, high accuracy triple supply CC n Monitors Three Inputs Simultaneously: monitor with a power-fail comparator. Reset timeout may 3.3V, 5V, ADJ (LTC2911-1) be selected with an external capacitor or set to an internally 3.3V, 2.5V, ADJ (LTC2911-2) generated 200ms. 3.3V, 1.8V, ADJ (LTC2911-3) The V1 pin monitors a 3.3V supply. The V2 pin monitors a 3.3V, 1.2V, ADJ (LTC2911-4) 5V, 2.5V, 1.8V, 1.2V or adjustable supply. A third adjustable 3.3V, ADJ, ADJ (LTC2911-5) input has a nominal 0.5V threshold allowing a resistive n 1.5% Threshold Accuracy divider to configure its threshold. All three comparators n Power-Fail Monitor feature a tight 1.5% threshold accuracy over the entire n RST State Can Be Held for Margining operating temperature range while a glitch filter ensures n Low Supply Current: 30A Typical reliable reset operation. n Input Glitch Immunity n A spare comparator can be configured to provide early Adjustable Reset Timeout Period n warning of a low voltage condition. It causes the PFO output Selectable Internal Timeout Saves Components n to pull low when the voltage of the PFI input falls below 0.5V, Space Saving 8-Lead TSOT-23 and 3mm 2mm DFN allowing the power-fail threshold to be configured with Packages a resistive divider. A latch feature on the TMR pin allows the RST output to be latched to prevent system resets, APPLICATIONS simplifying margin testing. n L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Network Servers Technology Corporation. All other trademarks are the property of their respective owners. n Desktop and Notebook Computers Protected by U.S. Patents, including 6949965, 7292076. n Automotive and Industrial Electronics TYPICAL APPLICATION RST Output Voltage With 10k Pull-Up to V1 3.3V 6 V1 = V2 2.5V DC/DC SYSTEM CONVERTER LOGIC 5 1.0V 10k TMR 4 RESET V1 RST LOBAT V2 PFO 3 76.8k LTC2911-2 ADJ 2 576k 100k Li-Ion + BATTERY PFI 1 STACK GND 100k t = 200ms RST 0 2911 TA01a 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 V1 (V) 2911 TA01b 2911f 1 V (V) RSTLTC2911 ABSOLUTE MAXIMUM RATINGS (Notes 1, 2, 3) Supply Voltages Operating Temperature Range V1, V2 ................................................... 0.3V to 6.5V LTC2911C ................................................ 0C to 70C Input Voltages LTC2911I.............................................. 40C to 85C ADJ ....................................................... 0.3V to 6.5V LTC2911H .......................................... 40C to 125C PFI ........................................................... 0.3V to 2V Storage Temperature Range ................... 65C to 150C TMR ............................................0.3V to (V1 + 0.3V) Lead Temperature (Soldering, 10 sec) Output Voltages TSOT-23 ............................................................ 300C RST, PFO .............................................. 0.3V to 6.5V PIN CONFIGURATION TOP VIEW TOP VIEW V2 1 8 PFI PFI 1 8 V2 V1 2 7 ADJ 9 ADJ 2 7 V1 GND PFO 3 6 TMR TMR 3 6 PFO RST GND GND 4 5 RST 4 5 TS8 PACKAGE 8-LEAD PLASTIC TSOT-23 DDB PACKAGE 8-LEAD (3mm 2mm) PLASTIC DFN T = 150C, = 195C/W JMAX JA T = 150C, = 76C/W JMAX JA EXPOSED PAD (PIN 9) IS GND, PCB CONNECTION OPTIONAL ORDER INFORMATION LTC2911 C DDB 1 TRM PBF LEAD FREE DESIGNATOR PBF = Lead Free Finish Parts None = Lead Based Finish Parts TAPE AND REEL TR = Tape and Reel TRM = 500-Piece Tape and Reel PRODUCT SELECTION 1, 2, 3, 4, 5 See Product Selection Guide for Details PACKAGE TYPE DDB = 8-Lead (3mm 2mm) Plastic DFN TS8 = 8-Lead Plastic TSOT-23 TEMPERATURE GRADE C = Commercial Temperature Range (0C to 70C) I = Industrial Temperature Range (40C to 85C) H = Automotive Temperature Range (40C to 125C) PRODUCT PART NUMBER Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: