LTC4360CSC8-2

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PMIC, or power management integrated circuit, is an essential form of high power control. It is widely used for high voltage, current, and energy control. The LTC4360CSC8-2 is a high voltage power switch IC with integrated undervoltage lockout (UVLO) and overvoltage protection (OVP). It is a versatile, cost-effective solution for a wide range of applications.

Applications

The LTC4360CSC8-2 can be used in a variety of ways. It is capable of switching multiple supplies simultaneously and operates at high frequency, making it suitable for several applications, including power supplies and DC-to-DC converters, control systems, and industrial automation systems. It can also be used as an input protection switch, enabling the following features:

• Optimized turn-on and turn-off behavior
• Separate turn-on and turn-off UVLO pins
• Pulse skipping for ultra-low on-resistance at light loads
• Programmable rise and fall times
• Internal thermal shutdown
• Low standby current

The LTC4360CSC8-2 has an extendable on-resistance, with the ability to be adjusted for 0.1Ω up to the rating. It also supports logic-level low-side switching, which allows the device to be controlled with a logic-level, digital signal. The duty-cycle of the device could be adjusted, thus allowing it to be adapted to a wide range of devices.

Working Principle

The high voltage power switch IC is composed of a logic interface block and a power switch block. The logic interface block is the main control unit, providing all control functions. The power switch block is composed of the power switching MOSFETs and a protection circuit. When the switch is enabled, the integrated circuit from the logic interface block provides drive voltage to the power switch block, turning on the power MOSFETs. The on-state resistance of the PMOS affects the load current. The UVLO and OVP in the power switch block will turn off the power switch block at under voltage or over voltage protection.

To ensure the current load for designed requirements, the required resistors must be set up properly. When the switch is off, leakage currents from the outputs of the power MOSFETs flow to ground in the PMIC. This current is limited to 6µA in order to minimize the output voltage drop. To improve efficiency, the LTC4360CSC8-2 can operate in a pulse skipping mode, which skips cycles of the output voltage to reduce the on-resistance of the MOSFETs.

Conclusion

The LTC4360CSC8-2 is a high voltage power switch IC with integrated undervoltage lockout (UVLO) and overvoltage protection (OVP). It is an excellent choice for high voltage applications due to its features such as a wide current range, high frequency operation, low standby current, and extendable on-resistance. This device is also capable of low-side switching with a logic-level, digital signal, making it highly versatile and cost-effective.

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