LTC3872HTS8#TRMPBF

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The LTC3872HTS8#TRMPBF is a synchronous step-down DC/DC controller which integrated high flxiblity and excellent load and line transient characteristics with a digitally programmable interface. This DC/DC controller satisfies the power management needs of a wide range of applications, such as portable devices, distributed power supply systems and telecommunication devices.

Application Field

The LTC3872HTS8#TRMPBF is designed to provide an efficient and cost effective solution for notebook computers, server and workstation applications. It is ideal for applications that require multiple output power rails, such as DDR memory, core voltage and system control voltage. It also can be used to create a synchronous buck regulator with output voltage up to 25V. Additionally, it also can be employed to design a high current output supply with excellent line and load transient response.

Working Principle

The LTC3872HTS8#TRMPBF DC/DC controller is a synchronous 2-phase step-down DC/DC converter. It combines two voltage regulation loops, one for the constant on-time (COT) control loop and the other for the error amplifier control loop. The COT control loop regulates the switching of the low-side (LS) or high-side (HS) MOSFET. The error amplifier control loop regulates the average output voltage to the setpoint voltage by alternating the duty cycle. The LTC3872HTS8#TRMPBF is designed to reduce EMI and reduce the powerStage switching stress by having separate control of the HS and LS drive signals.

The LTC3872HTS8#TRMPBF also features advanced current mode control, peak current mode control, and indirect CCM mode control. In advanced current mode, the PWM converter operates in continuous conduction mode (CCM) with peak current controlled by pre-programmed current limit values. The peak current limit is adjusted by varying the inductance. In peak current mode, the switching frequency remains constant for varying load levels and the system inductor value is optimized for the peak current not the rms current. In indirect CCM mode, the converter operates in a discontinuous conduction mode (DCM) at light load but converts to CCM at heavy load.

The LTC3872HTS8#TRMPBF also integrates digital compensation, providing an easy to design and accurate currentmode loop compensation. The adjustable output duty cycle allows DCM operation at light loads and low ripple at heavy load. Other features include overvoltage protection, power-good flag and thermal shutdown.

Conclusion

The LTC3872HTS8#TRMPBF is a synchronous 2-phase step-down DC/DC controller which features high flxiblity and excellent line and load transient characteristics. It enables portable devices, distributed power supply systems, and telecommunication devices to achieve an efficient and cost effective solution with multiple output power rails. In addition, the LTC3872HTS8#TRMPBF also offers a range of advanced features, such as digital compensation, overvoltage protection, and powergood flag, to provide a robust and long lasting DC/DC controller.

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