Datasheet LTC4367 (Analog Devices) - 9
| Manufacturer | Analog Devices |
| Description | 100V Overvoltage, Undervoltage and Reverse Supply Protection Controller |
| Pages / Page | 22 / 9 — OPERATION. Figure 1. Polarity Protection for DC Barrel Connectors |
| File Format / Size | PDF / 880 Kb |
| Document Language | English |
OPERATION. Figure 1. Polarity Protection for DC Barrel Connectors
Model Line for this Datasheet
- LTC4367CDD#PBF LTC4367CDD#TRPBF LTC4367CDD-1#PBF LTC4367CDD-1#TRPBF LTC4367CMS8#PBF LTC4367CMS8#TRPBF LTC4367CMS8-1#PBF LTC4367CMS8-1#TRPBF LTC4367HDD#PBF LTC4367HDD#TRPBF LTC4367HDD-1#PBF LTC4367HDD-1#TRPBF LTC4367HMS8#PBF LTC4367HMS8#TRPBF LTC4367HMS8-1#PBF LTC4367HMS8-1#TRPBF LTC4367IDD#PBF LTC4367IDD#TRPBF LTC4367IDD-1#PBF LTC4367IDD-1#TRPBF LTC4367IMS8#PBF LTC4367IMS8#TRPBF LTC4367IMS8-1#PBF LTC4367IMS8-1#TRPBF
Text Version of Document
link to page 9 LTC4367
OPERATION
Many of today’s electronic systems get their power from unexpected supply voltage conditions, while providing a external sources such as AC or wall adaptors, batteries low loss path for qualified power. and custom power supplies. Figure 1 shows a supply ar- In the past, to protect electronic systems from improperly rangement using a DC barrel connector. Power is supplied connected power supplies, system designers often added by an AC adaptor or, if the plug is withdrawn, by a remov- discrete diodes, transistors and high voltage comparators. able battery. Note that the polarity of the AC adaptor and The high voltage comparators enable system power only barrel connector varies by manufacturer. Trouble arises if the input supply falls within a desired voltage window. when any of the following occurs: A Schottky diode or P-channel MOSFET typically added • The battery is installed backwards in series with the supply protects against reverse supply • An AC adaptor of opposite polarity is attached connections. • An AC adaptor of excessive voltage is attached The LTC4367 provides accurate overvoltage and undervolt- age comparators to ensure that power is applied to the • The battery is discharged below a safe level system only if the input supply meets the user selectable This can lead to supply voltages that are too high, too voltage window. Reverse supply protection circuits au- low, or even negative. If these power sources are applied tomatically isolate the load from negative input voltages. directly to the electronic systems, the systems could be During normal operation, a high voltage charge pump subject to damage. The LTC4367 is an input voltage fault enhances the gate of external N-channel power MOSFETs. protection N-channel MOSFET controller. The part isolates Power consumption is 5µA during shutdown and 70µA an input supply from its load to protect the load from while operating. The LTC4367 integrates all these func- tions in 8-lead MSOP and 3mm × 3mm DFN packages. –40V TO 100V PROTECTION RANGE M1 M2
+
AC BATTERY ADAPTOR LOAD INPUT CIRCUIT
–
GATE VIN VOUT LTC4367 R4 SHDN OV, UV PROTECTION R3 FAULT THRESHOLDS SET TO SATISFY LOAD CIRCUIT UV R2 OV 2.5V TO 60V R1 GND OPERATING RANGE 4367 F01
Figure 1. Polarity Protection for DC Barrel Connectors
4367fb For more information www.linear.com/LTC4367 9
OPERATION
Many of today’s electronic systems get their power from unexpected supply voltage conditions, while providing a external sources such as AC or wall adaptors, batteries low loss path for qualified power. and custom power supplies. Figure 1 shows a supply ar- In the past, to protect electronic systems from improperly rangement using a DC barrel connector. Power is supplied connected power supplies, system designers often added by an AC adaptor or, if the plug is withdrawn, by a remov- discrete diodes, transistors and high voltage comparators. able battery. Note that the polarity of the AC adaptor and The high voltage comparators enable system power only barrel connector varies by manufacturer. Trouble arises if the input supply falls within a desired voltage window. when any of the following occurs: A Schottky diode or P-channel MOSFET typically added • The battery is installed backwards in series with the supply protects against reverse supply • An AC adaptor of opposite polarity is attached connections. • An AC adaptor of excessive voltage is attached The LTC4367 provides accurate overvoltage and undervolt- age comparators to ensure that power is applied to the • The battery is discharged below a safe level system only if the input supply meets the user selectable This can lead to supply voltages that are too high, too voltage window. Reverse supply protection circuits au- low, or even negative. If these power sources are applied tomatically isolate the load from negative input voltages. directly to the electronic systems, the systems could be During normal operation, a high voltage charge pump subject to damage. The LTC4367 is an input voltage fault enhances the gate of external N-channel power MOSFETs. protection N-channel MOSFET controller. The part isolates Power consumption is 5µA during shutdown and 70µA an input supply from its load to protect the load from while operating. The LTC4367 integrates all these func- tions in 8-lead MSOP and 3mm × 3mm DFN packages. –40V TO 100V PROTECTION RANGE M1 M2
+
AC BATTERY ADAPTOR LOAD INPUT CIRCUIT
–
GATE VIN VOUT LTC4367 R4 SHDN OV, UV PROTECTION R3 FAULT THRESHOLDS SET TO SATISFY LOAD CIRCUIT UV R2 OV 2.5V TO 60V R1 GND OPERATING RANGE 4367 F01
Figure 1. Polarity Protection for DC Barrel Connectors
4367fb For more information www.linear.com/LTC4367 9
