LTC4241 LINER [Linear Technology], LTC4241 Datasheet
LTC4241
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LTC4241 Summary of contents
Page 1
... The PWRGD output of the primary controller indicates when all four PCI supplies are within tolerance. The FAULT output indicates an overcurrent condition for any of the five supplies. The LTC4241 is available in the 20-pin narrow SSOP package 0.005 ...
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... EEOUT 12V .................................................. –0.3V to 14V OUT AUXGATE ......................... Internally Limited (Note 3) Operating Temperature Range LTC4241CGN ........................................... LTC4241IGN ........................................– Storage Temperature Range ..................– 150 C Lead Temperature (Soldering,10sec).................... 300 C DC ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are 3.3V. (Note 2) ...
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... AUXGATE AUXIN AUXIN Note internal zener on the AUXGATE pin clamps the charge pump voltage to a typical maximum operating voltage of 12V. External overdrive of the AUXGATE pin beyond the internal zener voltage may damage the device. LTC4241 = 3.3V 5V, 3VIN 5VIN MIN TYP ...
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... LTC4241 W U TYPICAL PERFOR A CE CHARACTERISTICS 3.3V and 5V Current Foldback Profile 12 3V OUT 10 5V OUT 3. 0.005 SENSE 0 0.5 1.5 2.5 3.5 4.5 5.5 OUTPUT VOLTAGE (V) 4241 • G01 5V Current Limit Voltage IN vs Temperature OUT OUT 10 0 –75 –50 –25 ...
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... TEMPERATURE ( C) 4241 • G14 Power Good Threshold Voltage vs Temperature (5V ) OUT 4.68 4.67 4.66 4.65 4.64 4.63 4.62 4.61 4.60 –75 –50 – 100 125 150 TEMPERATURE ( C) 4241 • G17 LTC4241 (V – AUXGATE AUXIN vs Temperature 8.20 AUXIN = 3.3V 8.15 8.10 8.05 8.00 7.95 7.90 7.85 7.80 7.75 –75 –50 – 100 125 150 TEMPERATURE ( C) 4241 • G12 ...
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... LTC4241 W U TYPICAL PERFOR A CE CHARACTERISTICS Power Good Threshold Voltage vs Temperature (V ) EEOUT –10.60 –10.55 –10.50 –10.45 –10.40 –10.35 –10.30 75 100 125 150 –75 –50 – TEMPERATURE ( C) 4241 • G19 12V Supply Current IN vs Temperature 2.9 2.8 2.7 2.6 2.5 2.4 2.3 2.2 –75 –50 – 100 ...
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... SENSE resistor placed in the supply path between 3V 2.9V, V 4.65V, 5VOUT 3V , the GATE pin voltage will be adjusted to maintain SENSE LTC4241 pin is less than 2.5V 3. the (Pin 14): 3.3V Current Limit Set Pin. With a sense pin. and IN sn4241 4241f ...
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... OUT V (Pin 19): –12V Supply Output. A 1.2 switch is EEOUT connected between V EEIN fall below –10.5V before the PWRGD signal can go low on the LTC4241. 12V (Pin 20): 12V Supply Output. A 0.5 switch is OUT connected between 12V and IN exceed 11.1V before the PWRGD signal can go low on the ...
Page 9
... PRIMARY CONTROL LOGIC REF 12V CP4 + Q6 – TIMER V V EEIN EEOUT Q12 + AUXILIARY CONTROL LOGIC FILTER – 2.6V UVL LTC4241 OUT OUT Q8 + – 2.5V C UVL P1 + – REF CP2 + – REF Q10 CP3 + – PCI-BUS HOT SWAP CONTROLLER ...
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... The transient currents can cause permanent damage to the connector pins and glitches the power bus, causing other boards in the system to reset. The LTC4241 is designed to turn a board’s supply voltages on and off in a controlled manner, allowing the board to be safely inserted or removed from a live PCI slot without glitching the system power supplies ...
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... The timer period should be set longer than the maximum supply turn-on time but short enough to not exceed the maximum safe operating area of the pass transistor during a short-circuit. The timer period is given by: t TIMER LTC4241 ON 10V/DIV TIMER 10V/DIV GATE 10V/DIV ...
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... LTC4241 U U APPLICATIO S I FOR ATIO For C = 0.1 F, the timer period will be ~50ms. The TIMER TIMER pin is immediately pulled low when ON goes low. Thermal Shutdown The internal switches for the 12V and –12V supplies are protected by an internal current limit and thermal shut- down circuit ...
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... OUT 5A R7 100 18 C1 OUT 0.047 F Figure 7. Power-Up/Down Sequence for 3.3V Auxiliary Supply AUX LTC4241 , the AUXGATE pin AUXIN • dV/ • C LOAD is the total load capacitance on LOAD = 0.7A, the inrush LIMIT . The ramp-up time for LIMIT output to reach its final value is equal to • ...
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... Power MOSFET and Sense Resistor Selection Table 4 lists some available N-channel power MOSFETs . , of F Table 5 lists some current sense resistors that can be used with the LTC4241’s circuit breakers. Table 6 lists the supplier web site addresses for discrete components mentioned throughout this datasheet. PACKAGE V ...
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... TYP 1 .015 .004 45 .053 – .068 (0.38 0.10) (1.351 – 1.727) 0 – 8 TYP .008 – .012 (0.203 – 0.305) INCHES LTC4241 MANUFACTURER Vishay-Dale IRC-TT Vishay-Dale IRC-TT Vishay-Dale IRC-TT Vishay-Dale Vishay-Dale Vishay-Dale .337 – .344* (8.560 – 8.737) ...
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... IN IN SENSE SENSE LTC4241 Figure 9. System Without 3.3V Supply COMMENTS Operates from 3V to 12V and Supports –12V System Reset Output with Programmable Delay Operates from 9V to 80V, SO-8 Package, Latch Off/Auto Retry Operates Up to 16.5V, Protected to 33V 3.3V, 5V and 12V in Narrow 16-Pin SSOP Package 3 ...