LTC4214-2IMS#TRPBF Linear Technology, LTC4214-2IMS#TRPBF Datasheet
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LTC4214-2IMS#TRPBF
Specifications of LTC4214-2IMS#TRPBF
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LTC4214-2IMS#TRPBF Summary of contents
Page 1
... MOSFET inrush current at start-up. A power good status output can enable a power module at start-up or disable it if the circuit breaker trips. The LTC4214-1 latches off after a circuit breaker fault times out. The LTC4214-2 provides automatic retry after a fault. The LTC4214 is available in the 10-pin MSOP package. ...
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... DRAIN Pin Minimum Voltage .............................. – 0.3V Current into DRAIN Pin (100 s Pulse) ................... 5mA Maximum Junction Temperature .......................... 125 C Operating Temperature Range LTC4214-1C/LTC4214-2C ....................... LTC4214-1I/LTC4214-2I ................... – Storage Temperature Range ................. – 150 C Lead Temperature (Soldering, 10 sec).................. 300 C ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are at T SYMBOL ...
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... All voltages are referenced to V specified 1 1 1.2 1.0 0.8 0.6 0.4 0 (V) IN LTC4214-1/LTC4214-2 MIN TYP MAX –15 0.1 3 1.7 –5 = 2.2V TMR = 2.2V 28 TMR –40 –200 DRN 1.109 1.232 1.355 0.1 3.5 4.2 0.2 –30 –50 130 0.4 0.4 unless otherwise EE ...
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... LTC4214-1/LTC4214 TYPICAL PERFOR A CE CHARACTERISTICS otherwise specified. Undervoltage Lockout Hysteresis V vs Temperature LKH 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 –55 –35 – 105 25 65 TEMPERATURE ( C) 4214 G04 Fast Current Limit Voltage V vs Temperature FCL 300 V = 12V IN 275 250 225 200 ...
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... V vs Temperature UVHST 0. 12V IN 0.27 0.26 0.25 0.24 0.23 0.22 85 105 125 –55 –35 – TEMPERATURE ( C) LTC4214-1/LTC4214-2 All voltages are referenced to V Unless EE I (FCL, Sinking) GATE vs Temperature 400 V = 12V IN UV/OV = 2.5V 350 TIMER = 0.15V SENSE 300 V GATE 250 200 150 ...
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... LTC4214-1/LTC4214 TYPICAL PERFOR A CE CHARACTERISTICS otherwise specified Temperature OVHST 0. 12V IN 0.17 0.16 0.15 0.14 0.13 0.12 85 105 –55 –35 – TEMPERATURE ( C) 4214 G22 TIMER Threshold vs Temperature 4 12V IN 3.5 3.0 V TMRH 2.5 2.0 V TMRL 1.5 1.0 0.5 85 105 –55 –35 – TEMPERATURE ( C) ...
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... Temperature SS 160 V = 12V IN SS PIN FLOATING, V RAMPS FROM 0.2V TO 1.4V 150 SS 140 130 120 110 100 125 –55 –35 – 105 TEMPERATURE ( C) LTC4214-1/LTC4214-2 All voltages are referenced to V Unless DRN DRAIN 100 V = 12V 0.1 0.01 0.001 0.0001 0.00001 125 V (V) ...
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... LTC4214-1/LTC4214 CTIO S V (Pin 1): Positive Supply Input. Connect this pin to the IN positive side of the supply via a resistor. An internal undervoltage lockout (UVLO) circuit holds GATE low until the V pin is greater than V (5.1V), overriding UV and IN LKO OV high low and V IN TIMER starts an initial timing cycle before initiating a GATE ramp-up ...
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... C eventually integrates up to the V breaker trips, GATE quickly pulls low and PWRGD pulls high. The LTC4214-1 TIMER pin latches high with pull-up source. This latched fault is cleared by either pulling TIMER low with an external device or by pulling UV below 2V ...
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... LTC4214-1/LTC4214-2 W BLOCK DIAGRA – – 2.25V – TIMER 10 – 1. 69.35k 3.65k – 1.232V LOGIC FCL + V = 10mV ACL OS + – – 50mV – + – DRAIN PWRGD GATE 2.8V + – – – + 0.5V + 200mV + – – SENSE 4214 BD 421412f ...
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... The flow of current damages the connector pins and glitches the power bus, causing other boards in the system to reset. The LTC4214 is designed to turn on a circuit board supply in a controlled manner, allowing insertion or removal without glitches or connector damage. ...
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... LTC4214 will fully enhance the MOSFET. A second possibility is that the load current exceeds the soft-start current limit threshold this case the LTC4214 will ramp the output by sourcing soft-start limited current into the load capacitance. If the soft-start voltage is below 1.2V, the circuit breaker TIMER is held low ...
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... EE to function. This can be derived from GND and –12V of a –12V system or the 3.3V and –5. –5.2V system. The positive supply is connected that the LTC4214 can have a usable V short or other transient events when (V below 6V. INTERNAL UNDERVOLTAGE LOCKOUT (UVLO) A hysteretic comparator, UVLO, monitors V undervoltage ...
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... OUT the charging of C Intermittent overloads may exceed the 50mV threshold at is used at T SENSE, but, if their duration is sufficiently short, TIMER will not reach 3V and the LTC4214 will not shut the external ) fast charge; circuit breaker delay. DRN • reaches 3V (V ...
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... SENSE voltage is less than 50mV. Therefore, any intermit- tent overload with V < 3V and an aggregate duty cycle OUT of 12.5% or more will eventually trip the circuit breaker and shut down the LTC4214. Figure 4 shows the circuit breaker response time in seconds normalized for The asymmetric charging and discharging of DRN fair gauge of MOSFET heating ...
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... ACL amplifier to recover. SHORT-CIRCUIT OPERATION Circuit behavior arising from a load side low impedance short is shown in Figure 5 for the LTC4214. Initially, the current overshoots the fast current limit level of V 200mV (Trace 2) as the GATE pin works to bring V control (Trace 3) ...
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... Figure 5 Trace 1, can rob charge from output capacitors on adjacent cards. When the faulty card shuts down, current flows in to refresh the capacitors. If LTC4214s are used by the other cards, they respond by limiting the inrush current to a value of 70mV/R ...
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... MAX Consult MOSFET SOA curves: the IRF7413 can handle 3.2A at 20V for 3.5ms safe to use in this application. Calculate 22nF. SS FREQUENCY COMPENSATION C response. The LTC4214 typical frequency compensation network for SS SS the analog current limit loop is a series R connected given by: ...
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... MOSFET avalanche. SENSE RESISTOR CONSIDERATIONS For proper circuit breaker operation, Kelvin-sense PCB connections between the sense resistor and the LTC4214’s V and SENSE pins are strongly recommended. The EE drawing in Figure 7 illustrates the correct way of making connections between the LTC4214 and the sense resistor ...
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... In the example shown in Figure 9, power is delivered through long connector pins whereas the UV/OV divider makes contact through a short pin. This ensures the power , the fault TIMER cycle connections are firmly established before the LTC4214 is activated. At time point 1, the power pins make contact and V ramps through < ...
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... V (t) and soft-start limits the slew rate of the load GATEL ACL current. If the SENSE voltage (V V threshold at time point 7, the circuit breaker TIMER CB activates. The TIMER capacitor, C LTC4214-1/LTC4214 < 20 • V AND TIMER < TMRL , CHECK GATE < SENSE < V AND SS < 20 • V TMRL ...
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... W U Undervoltage Timing In Figure 10 when the UV pin drops below V (time point 1), the LTC4214 shuts down with TIMER, SS and GATE all pulling low. If current has been flowing, the SENSE pin voltage decreases to zero as GATE collapses. When UV recovers and clears V initial timer cycle begins followed by a start-up cycle. ...
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... TMRH • I DRN TMRL • ACL OS 20 • • GATE INITIAL TIMING START-UP LTC4214-1/LTC4214-2 (time point 1), an initial timing UVHI threshold. The initial timing cycle restarts, AND TIMER < TMRL , CHECK GATE < SENSE < V AND SS < 20 • V GATEL – GATEH V ACL V CB ...
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... LTC4214-1/LTC4214 APPLICATIO S I FOR ATIO Overvoltage Timing During normal operation, if the OV pin exceeds V shown at time point 1 of Figure 12, the TIMER and PWRGD status are unaffected. Nevertheless, SS and GATE pull down and the load is disconnected. At time point OVERSHOOTS OVHI OV V TIMER GATE ...
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... Momentary Circuit-Breaker Fault Figure 13. Circuit-Breaker Timing Behavior (All Waveforms are Referenced immediately and the LTC4214 shuts down. In Figure 13c, multiple momentary faults cause the TIMER capacitor to integrate and reach V the LTC4214 shuts down. During shutdown, the LTC4214-1 latches TIMER high with pull-up current source; the LTC4214-2 activates a shutdown cooling cycle ...
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... TIMER is used for reset. An initial timing cycle is generated if reset by the UV pin or the V TIMER SENSE DRAIN PWRGD Figure 14. Pushbutton Reset of LTC4214-1’s Latched Fault (All Waveforms are Referenced The duration of the TIMER reset pulse should be smaller than the time taken to reach 0. pin. With a single pole mechanical pushbutton switch, this may not be feasible ...
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... SENSE V OUT DRAIN PWRGD CB Figure 15. Shutdown Cooling Timing Behavior of LTC4214-2 (All Waveforms are Referenced and three 5 A charge phases in this shutdown cooling cycle spanning time points 2 and 3. At time point 3, the LTC4214 automatic retry occurs with a start-up cycle. , GATE pulls down Good thermal management techniques are highly recom- mended ...
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... LTC4214-1/LTC4214 APPLICATIO S I FOR ATIO Analog Current Limit and Fast Current Limit In Figure 16a, when SENSE exceeds V lated by the analog current limit amplifier loop. When SENSE drops below V , GATE is allowed to pull up. In ACL Figure 16b, when a severe fault occurs, SENSE exceeds ...
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... V ACL SENSE DRNCL V DRAIN DRNL PWRGD (17b) With External C SS LTC4214-1/LTC4214-2 (t) (Equation 7). At time ACL , at time point 7 and the circuit breaker CB (t). The current ACL can cause premature circuit breaker SS (t) may exceed the V potential during ACL CB values is SOA duration may ...
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... LTC4214-1/LTC4214 APPLICATIO S I FOR ATIO Power Limit Circuit Breaker Figure 18 shows the LTC4214 power limit circuit breaking application. The SENSE pin is modulated by the board supply voltage The zener voltage, V SUPPLY to be the same as the low supply operating voltage 10V. If the goal is to have the high supply ...
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... BSC 4.90 0.152 DETAIL “A” (.193 .006) 0.254 0 – 6 TYP 0.53 0.152 (.021 .006) DETAIL “A” SEATING PLANE 0.17 – 0.27 (.007 – .011) TYP LTC4214-1/LTC4214-2 0.497 0.076 (.0196 .003 REF 3.00 0.102 (.118 .004) (NOTE 0.86 1.10 (.034) ( ...
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... LTC4214-1/LTC4214-2 U TYPICAL APPLICATIO GND 470 100nF GND 1 (SHORT PIN 121k LTC4214 PWRGD 9 UV DRAIN R2 10 TIMER 32. SENSE 47nF 1nF 22nF –12V *M0C207 Z1:SMAJ15A Figure 19. – 12V/2A Hot Swap Controller RELATED PARTS PART NUMBER DESCRIPTION LTC1421 Two Channels, Hot Swap Controller LTC1642 ...