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LT4356IMS-1-PBF Datasheet(PDF) 7 Page - Linear Technology |
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LT4356IMS-1-PBF Datasheet(HTML) 7 Page - Linear Technology |
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7 / 20 page  LT4356-1 7 43561fd BLOCK DIAGRAM + – + – + – VCC SHDN IN+ AUXILLARY AMPLIFIER IA 1.25V 50mV 2μA 1.35V 1.25V – + 1.25V 0.5V SNS TMR GND GATE 14V AOUT OUT 43561 BD VCC ITMR FLT EN FB CHARGE PUMP CONTROL LOGIC GATEOFF FLT OUT OV OC VA SHDN RESTART nal current source to turn the part back on. The leakage current to ground at the pin should be limited to no more than 1μA if no pull up device is used to turn the part on. The SHDN pin can be pulled up to 100V or below GND by 60V without damage. SNS (Pin 5/Pin 4): Current Sense Input. Connect this pin to the output of the current sense resistor. The current limit circuit controls the GATE pin to limit the sense voltage between VCC and SNS pins to 50mV. At the same time the sense amplifier also starts a current source to charge up the TMR pin. This pin can be pulled below GND by up to 60V, though the voltage difference with the VCC pin must be limited to less than 30V. Connect to VCC if unused. TMR (Pin 1/Pin 10): Fault Timer Input. Connect a ca- pacitor between this pin and ground to set the times for early warning, fault and cool down periods. The current charging up this pin during fault conditions depends on the voltage difference between the VCC and OUT pins. When VTMR reaches 1.25V, the FLT pin pulls low to in- dicate the detection of a fault condition. If the condition persists, the pass transistor turns off when VTMR reaches the threshold of 1.35V. The pull up current stops and a 2μA current source starts to pull the TMR pin down as soon as the fault condition disappears. When VTMR reaches the retry threshold of 0.5V, the GATE pin pulls high turning back on the pass transistor. VCC (Pin 6/Pin 5): Positive Supply Voltage Input. The positive supply input ranges from 4V to 80V for normal operation. It can also be pulled below ground potential by up to 60V during a reverse battery condition, without damaging the part. The supply current is reduced to 7μA with all the functional blocks off. |
Similar Part No. - LT4356IMS-1-PBF |
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Similar Description - LT4356IMS-1-PBF |
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