LTC3862EFE-1

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The LTC3862EFE-1 is part of Linear Technology’s family of Power Management Integrated Circuits (PMIC) for Voltage Regulators and DC-DC Switching Controllers. This IC provides an integrated solution for boost, buck-boost, and SEPIC converter applications. In order to understand its operation, it is instructive to explore its range of application fields and its working principle.

Application Fields

The LTC3862EFE-1 features a current-mode, continuous conduction mode (CCM) PWM controller that allows for critical system optimization.The device has two integrated channels which can be used for single-rail applications or dual-rail applications. This IC is ideal for applications where high efficiency combined with fast transient response is required for long battery life. It can also be used in parallel configurations for seamless scalability as power demands increase. Furthermore, this IC also features a low RDSon switch and its integrated low quiescent current operation allows it to be used in a variety of battery-powered applications.

This IC is suitable for the following applications: Automotive, solar converters, adjustable bench supply, LCD TV, laptop adapters, AC-DC adapter, industrial chargers, portable medical instruments and automotive accessory power modules.

Working Principle

The LTC3862EFE-1 works on an Error Amplifier (EA) based architecture. This architecture is capable of providing both input voltage and output voltage supervision for maximum flexibility. The EA provides a reference voltage to the PWM circuitry to control the duty cycle.

The low side driver of this IC implements fixed oscillator frequency operation and has a sleep mode that reduces power consumption. In addition, the maximum duty cycle is adjustable for improved light load efficiency. The error amplifier includes an overvoltage protection (OVP) and short-circuit protection.

Other features of the LTC3862EFE-1 include: regulated soft-start, skip-mode operation, low noise operation, and low standby current. The device integrates a number of protections including over-temperature, over-load, and under-load protections. Furthermore, the LTC3862EFE-1 has an input filter that eliminates EMI emissions.

Conclusion

The LTC3862EFE-1 is an ideal device for high-efficiency, high-power, and high-frequency applications. It is suitable for a wide range of battery-powered applications, including automotive, solar converters, adjustable bench supplies and LCD TVs. This IC works on an EA based architecture and implements fixed-oscillator frequency operation with adjustable maximum duty cycle for improved light load efficiency. The device also integrates a wide range of protection, such as over-temperature, over-load, and under-load protections.

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