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LTC4216 Datasheet(PDF) 7 Page - Linear Technology |
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LTC4216 Datasheet(HTML) 7 Page - Linear Technology |
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7 / 24 page  LTC4216 4216f 7 The LTC4216 is a Hot Swap controller residing either on a removable circuit board or on the backplane. It moni- tors the current and protects the load with an external N-channel MOSFET and a current sensing resistor (see Typical Application). Both inrush current limiting and short-circuit protection are provided by the LTC4216. The device is powered via the bias supply input (VCC) and it has a separate sense pin, SENSEP, to monitor the load supply (VIN). The load supply can extend from 0V to 6V, with a minimum bias supply voltage of 2.3V. When the ON pin is pulled from low to high, TIMER begins the first timing cycle by sourcing 2µA into C1 once these conditions are met: bias supply voltage out of undervolt- age lockout (> 2.12V); TIMER, SS, FILTER and GATE pin voltages < 0.2V. When the C1 voltage rises above the TIMER pin threshold (1.253V), TIMER pulls low and releases both the SS and GATE pins. C2 starts to ramp up at the SS pin, controlling the rate of GATE ramp. This limits the rate of change of the inrush current flowing into the output load capacitance. ⎯R⎯E⎯S⎯E⎯T pin goes high after the second timing cycle when the FB pin voltage exceeds 0.6V and its hysteresis. When the external MOSFET is fully turned on, the output will ramp to load supply voltage if the inrush into the load capacitance is low. However, if the inrush current exceeds the analog current limit of ΔVACL(TH)/RSENSE, the LTC4216 will ramp the output by sourcing the limited current into the load capacitance. The LTC4216 provides protection against output short- circuits or current overload through an internal electronic circuit breaker with trip threshold of 25mV and an analog current limit circuit. The circuit breaker response time is set by C3 at the FILTER pin. – + – + – + – + – + – + + – 0.2V 2.12V 0.4V 0.8V 0.6V 2 µA 2.4 µA 1.253V CP1 CP6 CP7 CP5 CP4 VCC VCC VCC SENSEP SENSEN GATE SS** RESET ON FB 4216 BD FAULT** GND TIMER FILTER NORMAL UVLO ECB ACL NOTE 1: FILTER DELAY IS SET BY FILTER PIN CAPACITOR ** ONLY AVAILABLE IN THE DE12 PACKAGE VCC VCC CP2 CP3 1.253V 1.253V 6 µs DELAY FAULT LATCH RESET DEVICE RESET FAULT LATCH-OFF OUT OF UVLO CB TRIPS OR UVLO GATE ON GATE OFF M4 M3 M2 M1 M5 M6 R1 M7 M9 M10 M8 Z1 D1 D2 CHARGE PUMP 100 µA 20 µA 40mV 25mV 10 µA1µA 5 µA GATE ON GATE OFF DEVICE RESET, UVLO OR POWER BAD CB TRIPS FILTER FUNCTION OF OVERDRIVE FILTER DELAY (SEE NOTE 1) 30 µs DELAY 60 µA VCC LOGIC 3 µs DELAY BLOCK DIAGRA OPERATIO |
Similar Part No. - LTC4216 |
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Similar Description - LTC4216 |
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