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LTC4352 Datasheet(PDF) 8 Page - Linear Technology |
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LTC4352 Datasheet(HTML) 8 Page - Linear Technology |
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8 / 16 page  LTC4365 8 4365f OPERATION Many of today’s electronic systems get their power from external sources such as a wall wart adapter, batteries and custom power supplies. These power sources are often unreliable, wired incorrectly, out of spec, or just plain wrong. This can lead to supply voltages that are too high, too low, or even negative. If these power sources are applied directly to the electronic systems, the systems could be subject to damage. The LTC4365 is an input voltage fault protection N-channel MOSFET controller. The part isolates an input supply from its load to protect the load from unexpected supply voltage conditions, while providing a low loss path for qualified power. To protect electronic systems from improperly connected power supplies, system designers will often add discrete diodes, transistors and high voltage comparators. The high voltage comparators enable system power only if the input supply falls within a desired voltage window. A Schottky diode or P-channel MOSFET typically added in series with the supply protects against reverse supply connections. The LTC4365 provides accurate overvoltage and undervoltage comparators to ensure that power is ap- plied to the system only if the input supply meets the user selectable voltage window. Reverse supply protection circuits automatically isolate the load from negative input voltages. During normal operation, a high voltage charge pump enhances the gate of external N-channel power MOSFETs. Power consumption is 10μA during shutdown and 125μA while operating. The LTC4365 integrates all these functions in tiny TSOT-23 and 3mm × 2mm DFN packages. APPLICATIONS INFORMATION The LTC4365 is an N-channel MOSFET controller that protects a load from faulty supply connections. A basic application circuit using the LTC4365 is shown in Figure 1. The circuit provides a low loss connection from VIN to VOUT as long as the voltage at VIN is between 3.5V and VIN UV OV SHDN OV = 18V UV = 3.5V 4365 F01 VOUT FAULT GATE VIN 12V NOMINAL VOUT 3.5V TO 18V SI4946 60V DUAL GND LTC4365 R5 100k COUT 100μF R3 1820k R2 243k R1 59k + M1 M2 Figure 1. LTC4365 Protects Load from –40V to 60V VIN Faults 18V. Voltages at VIN outside of the 3.5V to 18V range are prevented from getting to the load and can be as high as 60V and as low as –40V. The circuit of Figure 1 protects against negative voltages at VIN as shown. No other ex- ternal components are needed. During normal operation, the LTC4365 provides up to 9.8V of gate enhancement to the external back-to-back N-channel MOSFETs. This turns on the MOSFET, thus connecting the load at VOUT to the supply at VIN. GATE Drive The LTC4365 turns on the external N-channel MOSFETs by driving the GATE pin above VOUT. The voltage differ- ence between the GATE and VOUT pins (gate drive) is a function of VIN and VOUT. |
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