LTC4365ITS8-1#TRMPBF IC

Technical Specifications of LTC4365ITS8-1#TRMPBF

Datasheet	LTC4365ITS8-1#TRMPBF datasheet
Category	Integrated Circuits (ICs)
Family	PMIC – Power Management – Specialized
Manufacturer	Linear Technology
Series	–
Packaging	Tape & Reel (TR)
Part Status	Active
Applications	Overvoltage, Undervoltage Protection
Current – Supply	125μA
Voltage – Supply	2.5 V ~ 34 V
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	SOT-23-8 Thin, TSOT-23-8
Supplier Device Package	TSOT-23-8

LTC4365ITS8-1#TRMPBF Description

The LTC4365ITS8-1#TRMPBF protects applications in which the power supply input voltages may be excessively high, excessively low, or even negative. It accomplishes this by regulating the gate voltages of a pair of external N-channel MOSFETs. This ensures that the output remains within a safe working range. The LTC4365 can tolerate voltages ranging from –40V to 60V and has a working range of 2.5V to 34V, all while only requiring 125A of current when it is functioning normally. Using an external resistive divider, two comparator inputs enable the configuration of the overvoltage (OV) and under-voltage (UV) set points, respectively.

The MOSFETs may be enabled and disabled from the outside by an external control provided by a shutdown pin, and the device can be put into a low-current shutdown condition using this pin as well. An error output will give you the status of the gate pin pulling low. When the component goes into shutdown or the input voltage is outside of the UV and OV set points, a problem is signaled. Similarly, a fault is indicated when the UV and OV set points are exceeded. The LTC4365 includes a turn-on delay of 36 milliseconds, which blocks power from 50Hz to 60Hz AC and debounces active connections. The LTC4365-1 has a decreased turn-on delay of 1 millisecond, which enables it to recover quickly from failures.

LTC4365ITS8-1#TRMPBF Features

• Wide Operating Voltage Range: 2.5V to 34V.
• Protection against overvoltages up to 60 V.
• Protection against a reverse supply voltage of -40V.
• LTC4365: Blocks 50Hz and 60Hz AC Power. Blocks 50Hz and 60Hz AC Power.
• LTC4365-1: Quick Recovery from Errors (One Millisecond).
• The application typically does not need an input capacitor or TVS.
• Protects against Undervoltage and overvoltage in a range that can be adjusted.
• Charge Pump can improve the performance of an External N-Channel MOSFET.
• Low Operating Current, measuring 125 microamperes.
• Current during low-power shutdown is 10 A.
• DFN and TSOT-23 (ThinSOTTM) Packages that are Compact with 8 Leads and Measure 3mm by 2mm.
• Automotive applications that meet the requirements of the AEC-Q100 standard.

Operation

Batteries, wall wart adapters, and specialized power supplies are external sources that supply power to many of today’s electronic equipment. Power can be received from either an AC adaptor or a battery that can be removed from the device if the plug is removed. When any of the following things go wrong, there will be trouble:

• The battery was put in upside-down.
• A wall charger with the polarity reversed is connected.
• A too-powerful AC adapter has been connected.
• It has been depleted so low that the battery is no longer secure.

Because of this, the voltages coming from the supply could end up being excessively high, excessively low, or even harmful. If these power sources are applied directly to the electronic systems, there is a possibility that the systems will be harmed. The LTC4365 is a controller for an N-channel MOSFET that features input voltage fault prevention. The component separates an input supply from the load it serves, thereby shielding the load from unanticipated changes in the supply voltage and ensuring a path with minimal power loss for qualified power.

System designers add many times, discrete diodes, transistors, and high-voltage comparators to electronic systems to protect them from the power supply that has been poorly connected. Only if the input supply is within a predetermined voltage window will the high voltage comparators allow electricity to be supplied to the system. To prevent reverse supply connections, it is common practice to include a Schottky diode or P-channel MOSFET in series with the supply.

To ensure that power is only supplied to the system if the input supply satisfies the user-selectable voltage window, the LTC4365 includes accurate comparators for both overvoltage and Undervoltage. These comparators are user-selectable. Protection circuits for reversed power supplies will automatically disconnect the load from negative input voltages. A high-voltage charge pump improves the performance of the gate of external N-channel power MOSFETs when the pump is operating normally. When it is turned off, it uses 10 microamperes of power, but when it is working, it uses 125 microamperes. These capabilities are included within the LTC4365, which comes in teeny TSOT-23 and 3mm 2mm DFN packages.

Applications Information

● Recovery Timer

A recovery delay timer is included in the LTC4365. This timer filters noise at the VIN input and helps prevent chatter at the VOUT output. After an OV or UV fault has been detected, the input supply needs to stay within the desired operating voltage window for at least 36 milliseconds (recovery) before the external MOSFET can be turned back on, as shown in Figures 5 and 6. The LTC4365-1 offers a recovery timeout period of 1 millisecond, making it ideal for applications that demand a quicker turn-on following a malfunction.

● Layout Considerations

It is advised to minimize the trace length between the LTC4365’s VIN pin and the drain of the external MOSFET and between its GATE pin and the gates of the external MOSFETs. Place the bypass capacitors at VOUT near the external MOSFET as close as possible. To reduce the ringing caused by the Hot Swap process, use high-frequency ceramic and bulk capacitors. Put the high-frequency capacitors in the position where they will be closest to the MOSFET. It is essential to keep in mind that the ESR of bulk capacitors acts to dampen ringing. Ceramic capacitors can ring at their resonance frequency because they have a low equivalent series resistance (ESR).

Conclusion

The overvoltage (OV) and under-voltage (UV) situations at VIN can be monitored with the help of the two accurate comparators provided by the LTC4365. When the input supply reaches a level higher than the user-adjustable OV threshold, the gate of the external MOSFET is abruptly shut off, which severes the connection between the input and the load. Similarly, the gate of the external MOSFET will be promptly turned off if the input supply drops below the user-adjustable UV threshold.

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