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LTC4361-2 Datasheet(PDF) 10 Page - Linear Technology |
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LTC4361-2 Datasheet(HTML) 10 Page - Linear Technology |
10 / 16 page LTC4361-1/LTC4361-2 10 436112f APPLICATIONS INFORMATION ON Input ON is a CMOS compatible, active low enable input. It has a default 5μA pull-down to ground. Connect this pin to ground or leave open to enable normal device operation. If it is driven high while the external MOSFET is turned on, GATE is pulled low with a weak pull-down current (40μA) to turn off the external MOSFET gradually, minimizing input voltage transients. The LTC4361 then goes into a low cur- rent sleep mode, drawing only 1.5μA at IN. When ON goes back low, the part restarts with a 130ms delay cycle. GATEP Control GATEP has a 2M resistive pull-down to ground and a 5.8V Zener clamp in series with a 200k resistor to IN. It con- trols the gate of an optional external P-channel MOSFET to provide negative voltage protection. The 2M resistive pull-down turns on the MOSFET once VIN – VGATEP is more than the MOSFET gate threshold voltage. The IN to GATEP Zener protects the MOSFET from gate overvoltage by clamping its VGS to 5.8V when VIN goes high. MOSFET Configurations and Selection The LTC4361 can be used with various external MOSFET configurations (see Figure 3). The simplest configuration is a single N-channel MOSFET. It has the lowest RDS(ON) and voltage drop and is thus the most power efficient solution. When GATE is pulled to ground, the N-channel MOSFET can isolate OUT from a positive voltage at IN up to the BVDSS of the N-channel MOSFET. However, reverse current can still flow from OUT to IN via the parasitic body diode of the N-channel MOSFET. For near zero reverse-leakage current protection when GATE is pulled to ground, back-to-back N-channel MOSFETs can be used. Adding an additional P-channel MOSFET controlled by GATEP provides negative input voltage protection down to the BVDSS of the P-channel MOSFET. Another configuration consists of a P-channel MOSFET controlled by GATEP and a N-channel MOSFET controlled by GATE. This provides protection against overvoltage and negative voltage but not reverse current. Figure 3. MOSFET Configurations GATEP OVERVOLTAGE, REVERSE- CURRENT PROTECTION NEGATIVE VOLTAGE PROTECTION GATE OVERVOLTAGE, REVERSE- CURRENT PROTECTION GATE GATE GATEP SUPPLY SUPPLY SUPPLY SUPPLY 436112 F03 OVERVOLTAGE PROTECTION OVERVOLTAGE PROTECTION M1 M1 M3 M1 M2 M1 M2 M3 NEGATIVE VOLTAGE PROTECTION GATE OUT OUT OUT IN RSENSE SENSE OUT IN RSENSE SENSE IN RSENSE SENSE IN RSENSE SENSE |
Similar Part No. - LTC4361-2 |
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Similar Description - LTC4361-2 |
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