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LTC4224-2 Datasheet(PDF) 5 Page - Linear Technology |
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LTC4224-2 Datasheet(HTML) 5 Page - Linear Technology |
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5 / 16 page  LTC4224-1/LTC4224-2 5 422412fa PIN FUNCTIONS SENSE1, SENSE2 (Pins 1,10): Current Sense Input. Con- nect this pin to an external sense resistor. The current limit circuit controls GATEn to limit the voltage between VCCn and SENSEn to 25mV. An Electronic Circuit Breaker (ECB) is active during current limiting and trips after 5ms. To disable current limit, connect this pin to VCCn. VCC1, VCC2 (Pins 2, 9): Supply Voltage and Current Sense Input. An undervoltage lockout circuit disables the part until VCC, the higher of VCC1 and VCC2, exceeds 2.4V. The lower supply is disabled until it exceeds 0.8V. GATE1, GATE2 (Pins 3, 8): Gate Drive for External N-channel MOSFET. A charge pump sources 10μA from GATE to turn on the external MOSFET. An internal clamp limits the gate voltage to 5.5V above the higher of VCC1 and VCC2. During turn-off, a 1.5mA pulldown current discharges GATE to ground. During short-circuits, a 125mA pulldown current is activated to discharge GATE to ground. FAULT (Pin 4): Fault Status Output. Open-drain output that is normally pulled high to VCC1 or VCC2 by an exter- nal resistor. It is pulled low when the ECB trips due to an overcurrent condition at either supply. This pin may be left open if unused. ON1, ON2 (Pins 5, 6): On Control Input. A falling edge turns on the external N-channel MOSFET and a rising edge turns it off. A low to high transition on this pin resets an ECB fault for the corresponding channel. Internally pulled up to VCC by a 10μA current source. GND (Pin 7): Device Ground. Exposed Pad (DFN Package Only): Exposed Pad may be left open or connected to device ground. FUNCTIONAL DIAGRAM CHARGE PUMP 422412 FD 0.8V 0.8V 2.4V VCC – + – + – + – + CHARGE PUMP – + GATE PULLDOWN LOGIC CONTROL GATE PULLDOWN 0.8V – + 0.8V VCC1 VCC2 10μA 10μA GATE1 GATE2 ON1 FAULT ON2 SENSE2 SENSE1 GND ACL1 ACL2 10μA 10μA 5.5V 5.5V ON2 ON1 ECB1 ECB2 VCC1 UV VCC2 UV 25mV 25mV VCC VCC VCC VCC |
Similar Part No. - LTC4224-2 |
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Similar Description - LTC4224-2 |
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