LTC3727EG#PBF

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The LTC3727EG#PBF is a high voltage, high performance buck-boost DC/DC controller with synchronous rectification. It is suitable for wide input voltage ranges that typically require two or more voltage regulator ICs to regulate the output voltage. It is highly efficient and IC includes features such as adjustable frequency (up to 2MHz), synchronous or asynchronous buck-boost capability, adjustable cycle shedding, adjustable soft-start and adjustable output voltage sense, making it especially adaptable for automotive or telecom applications where space, low noise and cost are factors.

LTC3727EG#PBF can be used in a wide range of inductor based switching regulator applications. Examples include stepped output voltage supply, post-regulation, battery backup, solar panel regulation, and ripple minimization. Furthermore, the controller integrates high current low side and high side gate drivers along with a clock driver, eliminating the need for separate drivers for the high side switch and clock.

The block diagram of the LTC3727EG#PBF consists of three main sections: the Gate Drivers, the Series Control Logic, and the Speed and Rise Time Control. The Gate Drivers provide the necessary drive for synchronous and asynchronous switches. The Series Control Logic (SCL) provides accurate on/off control of the integral MOSFETs, under-voltage lockout, over-temperature protection and adaptive protection. The Speed and Rise Time Control block provides adjustable frequency, preset soft start, and selectable slope compensation. When an over-temperature or under-voltage fault is detected, the SCL will disable internal circuitry and turn off the switches.

The LTC3727EG#PBF is pin compatible with the LTC3719 and LTC3720, but contains advanced features and enhanced protection. This makes it suitable for automotive, telecom, industrial and night-time applications. It offers voltage control with ±1.5%, low standby power dissipation, low noise, and current mode control with cycle-by-cycle current limit without requiring any external circuits.

In Brief, the LTC3727EG#PBF is a high voltage, high-performance buck-boost DC/DC controller rated for up to 100V. It is a versatile and powerful solution for applications with wide input voltage ranges and features adjustable frequency, synchronous or asynchronous buck-boost capability, adjustable cycle shedding, adjustable soft-start and adjustable output voltage sensing. The controller integrates high current low side and high side gate drivers along with a clock driver, eliminating the need for separate drivers for the high side switch and clock.

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