LT8570IDD#TRPBF

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LT8570IDD#TRPBF, developed by Linear Technology Corporation, is a highly integrated devices for both boosting and buck voltage regulation. It is suitable for applications that require a wide DC supply ranging from 4.5V to 25V. This device can be found in switch-mode DC-DC converters and in battery-powered step-up/down voltage regulators, making it a versatile solution for many applications, such as telecom power supply, point-of-load (POL) converters and automotive.

The LT8570IDD#TRPBF integrates a high-performance, low-noise 100mA, current mode pulse-width modulation (PWM) controller, an internal 3-A power switch, and a voltage regulator controller into a single package. In addition, the integrated device features a full cycle-by-cycle current limit and an enhanced analog error amplifier. The LT8570IDD#TRPBF also utilizes a N-channel MOSFET switch for improved efficiency and higher power density.

The device is optimized for a wide input voltage range and offers various options for current sharing and synchronization. The LT8570IDD#TRPBF can operate up to 3MHz using an external clock input, or it can be synchronized to an external clock. This makes the device suitable for applications such as power over Ethernet (PoE) and LED lighting, where higher switching frequencies are essential to maximize efficiency.

The LT8570IDD#TRPBF provides an adjustable soft start time, an enable and shutdown stand-by mode, and a fixed frequency oscillator with a 0%-100% duty cycle. The integrated device also includes a frequency dithering feature that allows for design flexibility and lower switching noise. The device is protected from short-circuit conditions and over-temperature conditions by an innovative circuit that implements an automatic power-down mode.

The LT8570IDD#TRPBF is designed to reduce overall board size, cost and design complexity, while still offering the performance of two separate devices. When combined with the optional external power die, the LT8570IDD#TRPBF significantly reduces the number of components required and enhances the PC board layout flexibility.

The LT8570IDD#TRPBF can operate in either step-up/down mode or in buck mode. In step-up/down mode, the device is capable of delivering up to 3A at the output voltage, with 8V to 25V input range, and 4.5V to 24V output range. In buck mode, the device is capable of delivering up to 5A at the output voltage with 4.5V to 24V input and output range. The internal switch is capable of sustaining a continuous load of 0.4A with minimum duty cycle of 20%. The input and output voltages should remain within ±2V.

The integrated PWM controller and voltage regulator controller within the LT8570IDD#TRPBF makes it a suitable choice for applications that require high performance, low noise, and current sensing capabilities. The PWM controller is based on the Pulse Feedback (PF) architecture, which delivers a fast transient response and excellent load regulation. The integrated PWM controller also includes a high-precision voltage feed-forward compensation network that improves the load regulation and transient response.

The integrated voltage regulator controller is the key to the LT8570IDD#TRPBF’s superior performance. This integrated voltage regulator controller features a “low dropout” design that limits the dropout voltage at the input of the regulator stage and allows for a direct connection to the step-up section. The voltage regulator controller also provides over-current protection and allows for current sharing operation with external components.

Overall, the LT8570IDD#TRPBF is an ideal solution for a variety of applications requiring highly integrated DC-DC conversion, such as telecom power supplies, point-of-load (POL) converters, and automated test equipment. Its superior efficiency, wide dynamic voltage range and low-dropout design make the LT8570IDD#TRPBF an ideal choice for a variety of switch-mode DC-DC conversion applications. Its feature-rich design and innovative packaging make it a great option for the power designer.

The LT8570IDD#TRPBF is packaged in an industry-standard 4mm x 4mm, 20-pin QFN package, making it suitable for designs with limited board space. The device is RoHS compliant and operates over the –40°C to +125°C temperature range.

In conclusion, the LT8570IDD#TRPBF is an ideal choice for a variety of switch-mode DC-DC conversion applications, such as telecom power supplies, point-of-load converters, and automated test equipment, due to its high performance, low noise, and current sensing capabilities. The device’s wide dynamic voltage range and low-dropout design provide an excellent platform for system power solutions that demand high efficiency and reliability.

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