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LTC4216 Datasheet(PDF) 6 Page - Linear Technology |
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LTC4216 Datasheet(HTML) 6 Page - Linear Technology |
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6 / 24 page  LTC4216 4216f 6 ⎯R⎯E⎯S⎯E⎯T (Pin 1/Pin 1): Reset or Power-Good Output. Open drain output that pulls low if the FB pin voltage falls below its threshold (0.6V). If an undervoltage lockout condition occurs, the ⎯R⎯E⎯S⎯E⎯T pin pulls low and ignores the FB pin voltage. ON (Pin 2/Pin 2): ON Control Input. A rising edge above the ON pin threshold (0.8V) initiates the start-up cycle and turns on the external N-channel MOSFET. A falling edge below 0.72V (80mV ON pin hysteresis) turns it off. If this pin is pulled below 0.4V, following a circuit breaker trip, it resets the electronic circuit breaker and fault latch. FILTER (Pin 3/Pin 3): Fault Filter Input. Connect a capacitor between this pin and ground to set up the fault filter delay. This pin sources 60µA or sinks 2.4µA when the voltage across the sense resistor exceeds 25mV or drops below 25mV respectively. TIMER (Pin 4/Pin 4): Timer Input. Connect a capacitor between this pin and ground to set up the start-up timing cycle duration. It also defines the ⎯R⎯E⎯S⎯E⎯T power-good delay from the instant the FB pin voltage exceeds 0.6V. This pin sources 2µA pull-up current during ramp up. SS (Pin 5/Not Available): Soft-Start Control Input. Con- nect a capacitor between this pin and ground for soft-start during power-up. It controls the GATE ramp up, limiting the rate of change of the inrush current when the external MOSFET turns on. If soft-start function is not used, leave this pin unconnected. GND (Pin 6/Pin 5): Device Ground. FB (Pin 7/Pin 6): Output Monitor for Reset Output. A resis- tive divider from the external MOSFET’s source terminal is tied to this pin. When the voltage at this pin drops below 0.6V, the ⎯R⎯E⎯S⎯E⎯T pin pulls low. GATE (Pin 8/Pin 7): Gate Drive for External N-Channel MOSFET. An internal charge pump provides 20µA gate pull-up current and sufficient gate overdrive to the exter- nal MOSFET. An internal shunt regulator limits the GATE pin voltage to about 6.2V (typ) above the SENSEN pin voltage. SENSEN (Pin 9/Pin 8): Circuit Breaker Negative Sense Input. Connect this pin to the sense resistor terminal wired to the drain of the external N-channel MOSFET. The sense resistor is placed in the power path between SENSEP and SENSEN pins to sense the output current. The electronic circuit breaker trips if the voltage across the sense resistor exceeds 25mV for more than a fault filter delay. SENSEP (Pin 10/Pin 9): Circuit Breaker Positive Sense Input. Connect this pin to the sense resistor terminal wired to the positive supply input for the external output load. This positive supply range extends from 0V to 6V. VCC (Pin 11/Pin 10): Bias Supply Input. Operates from 2.3V to 6V. An internal undervoltage lockout circuit disables the device until the input supply voltage at VCC exceeds 2.12V typically. ⎯F⎯A⎯U⎯L⎯T (Pin 12/Not Available): Fault Input and Output. As an input, driving this pin low (<1.253V) will latch-off the device to fault mode. As an output, it is either pulled high by an internal 5µA pull-up or an external pull-up resistor to positive supply under normal operating condition. It pulls low when the circuit breaker is tripped due to an overcurrent fault. Exposed Pad (Pin 13/Not Available): Exposed pad may be left open or connected to device ground. (DE12 Package/MS Package) PI FU CTIO S |
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Similar Description - LTC4216 |
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