LTC1728 LINER [Linear Technology], LTC1728 Datasheet
LTC1728
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LTC1728 Summary of contents
Page 1
... Very low (10 A typical) supply current makes the LTC1727/ LTC1728 ideal for power conscious systems. The LTC1727 is available in an 8-lead MSOP or SO package and the LTC1728 is available in a 5-lead SOT-23 package. , LTC and LT are registered trademarks of Linear Technology Corporation. Triple Supply Monitor with Power Good Output ...
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... PLASTIC 125 C, = 150 C/W JMAX JA ORDER S8 PART NUMBER PART MARKING 172725 LTC1727ES8-2.5 727I25 LTC1727IS8-2.5 LTC1727ES8-5 17275 1727I5 LTC1727IS8-5 All except LTC1728-1.8. The = 3.3V CC3 CONDITIONS V Input Threshold CC3 V Input Threshold (5V Version) CC5 V Input Threshold (2.5V Version) CC25 V Input Threshold CCA ...
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... Note 1: Absolute Maximum Ratings are those values beyond which the life of the device may be impaired. Note 2: All voltage values are with respect to GND. Note 3: The LTC1727E/LTC1728E are guaranteed to meet specified performance from and are designed, characterized and assured to meet the extended temperature limits of – but are not tested at these temperatures ...
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... G03 I vs Temperature VCC25 (LTC1727-2.5/LT1728-2.5) 1 3.3V CC3 1 2.5V CC25 V = 3.3V CCA 1.3 1.2 1.1 1.0 0.9 0.8 0.7 0.6 0.5 6 – 60 –40 – TEMPERATURE ( Temperature VCC5 (LTC1727-5/LTC1728- CC5 3.3V CC3 V = 3.3V CCA – 60 –40 – TEMPERATURE ( C) 100 ) CC 80 100 1727/28 G06 80 100 ...
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... TEMPERATURE ( C) I VCC3 (LTC1728-1. 100 – 60 1727/28 G13 V vs Temperature (LTC1728-1.8) 2.845 2.835 2.825 2.815 2.805 2.795 2.785 2.775 2.765 100 – 60 1727/28 G15 LTC1727/LTC1728 V Threshold Voltage CC5 vs Temperature (LTC1727-5/LTC1728-5) 4.750 4 ...
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... V . Bypass to ground with CC3 a 0.1 F ceramic capacitor. V (Pin 2/Pin 4): 1.8V Sense Input and Power Supply CC18 Pin. This pin is used on the LTC1728-1.8 to provide power to the part when the voltage on V than the voltage Bypass to ground with a 0.1 F CC3 ceramic capacitor. V (Pin 3/Pin 3): 1V Sense, High Impedance Input ...
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... BLOCK DIAGRA CC3 POWER DETECT V / CC5 2 V CC25 V 3 CCA GND 4 LTC1727-5/LTC1727-2.5 – INTERNAL CC – + 200ms PULSE GENERATOR – 200ms DELAY + BANDGAP REFERENCE LTC1727/LTC1728 V CC3 COMP3 V CC3 6 A COMP25/ 7 COMP5 V CC3 RST V CC3 COMPA 1727 BD1 7 ...
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... BLOCK DIAGRA CC3 POWER DETECT V / CC5 CC25 V CC18 V 3 CCA GND DIAGRA V RST COMPX 8 LTC1728-5/LTC1728-2.5/LTC1728-1.8 – INTERNAL CC – 200ms PULSE GENERATOR + – + BANDGAP REFERENCE V Monitor Timing CC V RTX CCX t RST CC3 RST 200ms ...
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... Supply Monitoring The LTC1727 is a low power, high accuracy triple supply monitoring circuit with three monitor outputs and a 200ms microprocessor reset output. The LTC1728 is a low power, high accuracy triple supply monitoring circuit with a single 200ms microprocessor reset output. All three V ...
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... CC5 to the voltage on V 25mV and the voltage on V CC3 less than 4.15V. In this manner, the LTC1727-5/ LTC1728-5 will behave as a 3.3V monitor and V capability will be disabled. The V trip point is reenabled when the voltage on V CC5 is equal to the voltage on V ...
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... Figure 4 contains a simple circuit for 5V systems that can’t risk the RST output going high in the 3.1V to 4.15V range (possibly due to very slow rise time on the 5V supply). Diode D1 powers the LTC1728-5 while dropping 0.6V from the V pin to the V pin. This prevents the part’s ...
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... TA04 Dual Supply Monitor (3. Plus Adjustable) 3. LTC1728-5 10k RST CC3 4 V CC5 R1 CCA 2 R2* GND 1727/28 TA05 *TO PRESERVE THRESHOLD ACCURACY, SET PARALLEL COMBINATION OF R1 AND R2 66.5k REFER TO LTC1728-5 OVERRIDE FUNCTIONS IN THE APPLICATIONS INFORMATION SECTION Input) CCA SYSTEM RESET ...
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... R2* GND 1727/28 TA06 *TO PRESERVE THRESHOLD ACCURACY, SET PARALLEL COMBINATION OF R1 AND R2 66.5k Using V Tied to DC/DC Feedback Divider CCA 2.9V 35.7k LTC1435 LTC1728 3. CC3 OSENSE 4 2. CC5 CCA 2 22.1k GND ADJUSTABLE 1% RESET TRIP THRESHOLD 2.74V 1727/28 TA07 LTC1727/LTC1728 SYSTEM RESET 1 SYSTEM RESET RST 13 ...
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... LTC1727/LTC1728 PACKAGE DESCRIPTIO 0.007 (0.18) * DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE ** DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE 0.35 – ...
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... TYP 0.014 – 0.019 (0.355 – 0.483) TYP LTC1727/LTC1728 0.150 – 0.157** (3.810 – 3.988 0.004 – 0.010 (0.101 – 0.254) 0.050 (1 ...
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... R1 R3* 1.07M 100nF 10k 0. 105k 0.1% V TRIP *OPTIONAL RESISTOR RECOMMENDED EXTEND ESD TOLERANCE 1 V RST CC3 LTC1728-5 V CC5 2 V GND CCA 1727/28 TA02 V CCA = ( TRIP – CCA COMMENTS 4.65V Threshold 2.9V Threshold 4.65V Threshold 4.37V/4.62V Threshold 4 ...