LTC3858IUFD-1#TRPBF

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The LTC3858IUFD-1#TRPBF is a high efficiency, dual, DC/DC buck controller with integrated MOSFETs. The device operates from an input voltage range of 4.5V to 28V and employs an input-synchronous, constant-frequency, peak current-mode architecture. The controller supports low component count and quick transient response. Separate voltage error amplifiers, programmable switching frequency, separate enable pins and independent voltage loop compensation minimize component count, reduce design time and improve efficiency.

The LTC3858IUFD-1#TRPBF offers two integrated independent buck channels that can be paralleled for higher current operation. Internal gate drivers enable the use of external MOSFETs for high current applications with high efficiency and low power loss. Moreover, the synchronization feature of the controller enables synchronization of both channels up to the external clock. The low ripple Burst Mode® operation of the controller provides improved efficiency over a wide load current range. The 0.5V output minimum can be adjusted with the OVLO pin.

The LTC3858IUFD-1#TRPBF offers unique features such as low on-state resistance as well as a differential current sensing scheme. The device also includes a power good enable pin, overload protection and short circuit protection for improved system reliability.

Application Field and Working Principle

The LTC3858IUFD-1#TRPBF DC/DC controller offers a high power density and low quiescent current solution for many of the power management applications including servers, mobile and embedded systems where reliable, efficient and cost-effective power delivery is a must. In addition to its versatile capabilities, the controller also offers other features such as fast response time, low switching noise and wide input voltage and current range. The design capability of the controller is also suitable for other applications such as automotive and industrial, where high power and efficient operation are essential.

The LTC3858IUFD-1#TRPBF DC/DC converter works on a simple concept. It is an adjustable current-mode controller that controls the output voltage of an external power supply by regulating the current in the output switching stage. The circuitry functions as a non-inverting power amplifier, where the output voltage is proportional to the input current applied to the circuit. The input is varied with a pulse-width-modulated signal that is derived from a voltage reference or an external digital input. The input current is compared with the output voltage, and the output switching stage is enabled and disabled according to the difference between the input and output signals. In order to ensure a stable and steady output voltage, the device also includes a comparator and a hysteresis loop.

The LTC3858IUFD-1#TRPBF DC/DC controller is also suitable for power system design due to its high accuracy and ultra-low quiescent current. It can also be used for battery charging applications since the high accuracy provides reliable energy transfer from the battery to the device. In addition, the controller also features integrated low RDSON MOSFETs and a low-side current sense amplifier, allowing the device to be used with low-resistance external power components. The integration of gate drivers simplifies the design and reduces external component count. The controller also includes an adjustable switching frequency, allowing the designer to choose the optimal frequency for their application.

In conclusion, the LTC3858IUFD-1#TRPBF is an ideal device for a number of power management applications, giving engineers the flexibility to design systems with high efficiency, long life and reliable performance. With its wide operational range and low quiescent current, the device is also optimized for battery applications like charging, providing both cost and time savings for engineers.

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