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LTC4210-4CS6 Datasheet(PDF) 7 Page - Linear Technology |
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LTC4210-4CS6 Datasheet(HTML) 7 Page - Linear Technology |
7 / 16 page 7 LTC4210-3/LTC4210-4 421034fa BLOCK DIAGRA – + – + + – 6 COMP1 CURRENT LIMIT INITIAL DOWN/NORMAL COOL OFF INITIAL UP/LATCH OFF 0.2V 60 µA 1.3V – + COMP2 COMP3 1.3V ON 5 µA TIMER 3 GND 100 µA 2 µA GLITCH FILTER SHUTDOWN M5 GATE 4210 BD UVLO VCC SENSE 50mV EA 5 CHARGE PUMP 10 µA Z1 12V Z2 26V 4 1 2 LOGIC GLITCH FILTER 4k Hot Circuit Insertion When circuit boards are inserted into live backplanes, the supply bypass capacitors can draw large transient cur- rents from the backplane power bus as they charge. Such transient currents can cause permanent damage to con- nector pins, glitches on the system supply or reset other boards in the system. The LTC4210 is designed to turn a printed circuit board’s supply voltage ON and OFF in a controlled manner, allow- ing the circuit board to be safely inserted into or removed from a live backplane. The LTC4210 can reside either on the backplane or on the daughter board for hot circuit insertion applications. Overview The LTC4210-3/LTC4210-4 is designed to operate over a range of supplies from 2.7V to 7V. Upon insertion, an undervoltage lockout circuit determines if sufficient sup- ply voltage is present. When the ON pin goes high an initial timing cycle assures that the board is fully seated in the backplane before the MOSFET is turned on. A single timer capacitor sets the periods for all of the timer functions. After the initial timing cycle the LTC4210 can either start up in current limit or with a lower load current. Once the external MOSFET is fully enhanced and the supply has ramped up, the LTC4210 monitors the load current through an external sense resistor. Overcurrent faults are actively limited to 50mV/RSENSE for a specified circuit breaker timer limit. The LTC4210-3 will automatically retry after a current limit fault while the LTC4210-4 latches off. The LTC4210-3 timer function limits the retry duty cycle to 3.8% for MOSFET cooling. APPLICATIO S I FOR ATIO |
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