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LT4356CMS-1-PBF Datasheet(PDF) 6 Page - Linear Technology |
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LT4356CMS-1-PBF Datasheet(HTML) 6 Page - Linear Technology |
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6 / 20 page  LT4356-1 6 43561fd PIN FUNCTIONS AOUT (Pin 11 DE Only): Amplifier Output. Open collector output of the auxiliary amplifier. It is capable of sinking up to 2mA from 80V. The negative input of the amplifier is internally connected to a 1.25V reference. EN (Pin 9/Pin 8): Open-Collector Enable Output. The EN pin goes high impedance when the voltage at the OUT pin is above (VCC – 0.7V), indicating the external MOSFET is fully on. The state of the pin is latched until the OUT pin voltage resets at below 0.5V and goes back up above 2V. The internal NPN is capable of sinking up to 3mA of cur- rent from 80V to drive an LED or opto-coupler. Exposed Pad (Pin 13 DE Only): Exposed pad may be left open or connected to device ground (GND). FB (Pin 2/Pin 1): Voltage Regulator Feedback Input. Con- nect this pin to the center tap of the output resistive divider connected between the OUT pin and ground. During an overvoltage condition, the GATE pin is servoed to main- tain a 1.25V threshold at the FB pin. This pin is clamped internally to 7V. Tie to GND to disable the OV clamp. FLT (Pin 8/Pin 7): Open-Collector Fault Output. This pin pulls low after the voltage at the TMR pin has reached the fault threshold of 1.25V. It indicates the pass transis- tor is about to turn off because either the supply voltage has stayed at an elevated level for an extended period of time (voltage fault) or the device is in an overcurrent condition (current fault). The internal NPN is capable of sinking up to 3mA of current from 80V to drive an LED or opto-coupler. GATE (Pin 4/Pin 3): N-Channel MOSFET Gate Drive Output. The GATE pin is pulled up by an internal charge pump current source and clamped to 14V above the OUT pin. Both voltage and current amplifiers control the GATE pin to regulate the output voltage and limit the current through the MOSFET. GND (Pin 10/Pin 9): Device Ground. IN+ (Pin 12 DE Only): Positive Input of the Auxiliary Amplifier. This amplifier can be used as a level detection comparator with external hysteresis or linear regulator controlling an external PNP transistor. This pin is clamped internally to 7V. Connect to ground if unused. OUT (Pin 3/Pin 2): Output Voltage Sense Input. This pin senses the voltage at the source of the N-channel MOSFET and sets the fault timer current. When the OUT pin volt- age reaches 0.7V away from VCC, the EN pin goes high impedance. SHDN(Pin7/Pin6):ShutdownControlInput.TheLT4356-1 can be shutdown to a low current mode by pulling the SHDN pin below the shutdown threshold of 0.6V. Pull this pin above 1.7V or disconnect it and allow the inter- (DE/MS) TYPICAL PERFORMANCE CHARACTERISTICS Specifications are at V CC = 12V, TA = 25°C unless otherwise noted. Overvoltage Turn-Off Time vs Temperature Overcurrent Turn-Off Time vs Temperature TEMPERATURE (°C) –50 0 100 0 50 100 125 43561 G17 500 400 300 200 –25 25 75 OVERVOLTAGE CONDITION VFB = 1.5V TEMPERATURE (°C) –50 1.0 1.5 0 50 100 125 43561 G18 4.0 3.5 3.0 2.5 2.0 –25 25 75 OVERCURRENT CONDITION ΔVSNS = 120mV |
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