LTC3670EDDB#TRPBF

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The LTC3670EDDB#TRPBF is a high frequency, synchronous, wide input range, dual-output, buck regulator, designed to optimize switching and linear performance for space sensitive applications. It integrates the DC/DC buck controller, two high-side and one low-side N-MOSFETs and a startup regulator.

The combination of linear and switching modes enables the LTC3670EDDB#TRPBF to deliver fast transient response and high efficiency over a wide range of output voltages and load currents. The switching frequency is adjustable up to 1MHz and the device can be operated with up to 95% duty cycle, allowing the use of small, low loss inductors and capacitors.

The LTC3670EDDB#TRPBF is capable of delivering high current, stable outputs with low noise, wide input voltage range (3.5V to 28V), adjustable output voltage down to 0.6V, and up to 6A of output current. It also has integrated protection for under-voltage lockout and over-voltage, over-temperature, and over-current protection.

The LTC3670EDDB#TRPBF also incorporates several features that enable a wide variety of applications, such as an enable pin that can be used to enable/disable the device, a soft-start pin to reduce inrush current, and a power good indicator to indicate that the output is within specifications. It also has programmable start-up and run-time auxiliaries for the buck regulator, allowing it to be optimized for different applications.

Application fields

The LTC3670EDDB#TRPBF can be used to design high efficiency, low noise power solutions in a wide range of applications, including computers, mobile phones, smartphones, portable navigation devices, communications base stations, and battery-powered systems. It is also ideal for applications like LED lighting, automotive battery chargers and power banks, as well as industrial and medical equipment.

Working Principle

The LTC3670EDDB#TRPBF is a synchronous buck regulator, meaning that the input voltage is regulated with both a linear regulator and a switching regulator. The switching regulator is responsible for converting the input voltage to a lower output voltage. It consists of two N-MOSFETs, one low-side and one high-side, that are connected in series and controlled by a PWM controller. The PWM controller adjusts the on-time of the high-side and low side MOSFET to regulate the output voltage. This switching regulator is also responsible for eliminating line and load transients, as well as providing a soft start function.

The linear regulator is responsible for providing low output voltage ripple, low noise, and improved transient response. It is essentially a voltage divider consisting of an external resistor divider and an internal current source. This linear regulator is used to reduce the output voltage ripple caused by the switching regulator and to control the output voltage more accurately. The linear regulator and the switching regulator work together to provide a clean output voltage, low noise, fast transient response and high efficiency.

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