LTC2919 Linear Technology, LTC2919 Datasheet
LTC2919
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LTC2919 Summary of contents
Page 1
... Precision Triple/Dual Input DESCRIPTIO The LTC variety of system monitoring applications. Polarity selec- tion and a buffered reference output allow the LTC2919 to monitor positive and negative supplies for undervoltage (UV) and overvoltage (OV) conditions. The two adjustable inputs have a nominal 0.5V threshold, featuring tight 1.5% threshold accuracy over the entire operating temperature range. Glitch fi ...
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... For more information on tape and reel specifi cations (Notes 1, 2) Operating Temperature Range LTC2919C ................................................ 0°C to 70°C LTC2919I..............................................– 40°C to 85°C LTC2919H .......................................... –40°C to 125°C + 0.3V) Maximum Junction Temperature........................... 150°C CC Storage Temperature Range ...................– 65°C to 150°C Lead Temperature (Soldering, 10 sec) MSOP-10 .......................................................... 300°C ...
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... ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T (LTC2919-5), ADJ1 = ADJ2 = 0.55V, SEL = fl oating, unless otherwise noted. (Note 2) SYMBOL PARAMETER V Operating Supply Voltage CC(MIN Shunt Regulation Voltage CC(SHUNT Input Current ADJ Input Threshold RT ΔV ADJ Hysteresis (Note 4) ...
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... LTC2919 ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T (LTC2919-5), ADJ1 = ADJ2 = 0.55V, SEL = fl oating, unless otherwise noted. (Note 2) SYMBOL PARAMETER I Allowable Leakage When Open SEL(Z) I SEL Input Current SEL Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device ...
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... SUPPLY VOLTAGE, V 2919 G11 OUT1, OUT2, RST Pull-Down Current OUTPUT AT 150mV 0.1 OUTPUT AT 50mV 0.01 0.001 0.0001 0.2 0.4 (V) SUPPLY VOLTAGE, V 2919 G14 INTERNAL = 22nF TMR 75 100 125 150 2919 G09 LTC2919 (V) CC 2919 G12 0.6 0.8 1 (V) CC 2919 G15 2919f 5 ...
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... LTC2919 W TYPICAL PERFOR A CE CHARACTERISTICS OUT1, OUT2, RST V vs Output OL Sink Current 1 PULL- 150° 25° 125° –40°C A 0.2 www.DataSheet4U.com OUTPUT SINK CURRENT (mA CTIO S (MSOP/DFN Package) SEL (Pin 1): Input Polarity Select Three-State Input. Con- ...
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... ADJ t PROP RST 1V t PROP OUT CC(UVLO RST t PROP AND Δ except in CC(UVLO) OUT RST PROP LTC2919 6.5V OUT1 TMR THREE-STATE DECODE PULSE RST 200ms GND PULSE OUT2 CONTROL 2919 Δ ...
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... Adjust Polarity Selection The external connection of the SEL pin selects the polarities of the LTC2919 adjustable inputs. SEL may be connected to GND, connected to V normal operation. When left unconnected, the maximum leakage allowable from the pin is ±5μA. Table 1 shows the three possible selections of polarity based on SEL connection ...
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... Proper confi guration of the SEL pin and setting of the trip-points via external resistors allows for any two fault conditions to be detected. For example, the LTC2919 may monitor two supplies (positive, negative or one of each) for UV or for OV (or one UV and one OV). It may also monitor a single supply (positive or negative) for both UV and OV. Tables 2a and 2b show example confi ...
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... All three of the LTC2919 inputs (ADJ1, ADJ2, V have the same maximum threshold accuracy of ±1.5% of the programmed nominal input voltage (over the full operat- ing temperature range) ...
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... Real supplies also have relatively high frequency variations from sources such as load transients, noise and pickup. The LTC2919 uses two techniques to combat spurious outputs toggling from high frequency variation. First, the timeout period helps prevent high frequency varia- www ...
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... Note that the value V should be negative for a negative TRIP application. The LTC2919 can also be used to monitor a single supply for both UV and OV. This may be accomplished with three resistors, instead of the four required for two independent supplies. Confi gurations are shown in Figures 3 and 4. R ...
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... During a fault condition guarantees a V The open-drain nature of the RST pin allows for wired-OR connection of several LTC2919s to monitor more than two supplies (see Typical Applications). Other logic with open- drain outputs may also connect to the RST line, allowing other logic-determined conditions to issue a reset. ...
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... ADJ2 OUT2 SEL TMR GND 2919 TA01b *OPTIONAL FOR ESD SYSTEM C BYP2 100nF SYSTEM_OK R P2A V CC 115k SEL ADJ1 R R P1A P2B LTC2919-3.3 13.7k 309k RST REF R P1B 11.5k OUT1 ADJ2 2919 TA02 OUT2 TMR C GND TMR2 2.2nF SYSTEM C BYP 100nF 5V R PU3 ...
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... MAX SEATING PLANE 0.17 – 0.27 (.007 – .011) 0.50 TYP (.0197) BSC LTC2919 R = 0.115 TYP R = 0.05 6 TYP 2.00 ±0.10 (2 SIDES) 0.64 ± 0.05 (2 SIDES) 5 0.25 ± 0.05 0.75 ±0.05 2.39 ±0.05 (2 SIDES) 0 – 0.05 BOTTOM VIEW—EXPOSED PAD 0.497 ± 0.076 (.0196 ± ...
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... McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 ● U Powered from 12V, +5V is Sequenced to Start-up First, OUT Followed by –5V , with ±5V UV Monitor, 200ms Timeout OUT LTC2919-2.5 115k +5V ADJ1 SEL R P1 13.7k REF OUT2 13.3k 137k –5V DC/DC ...