LT8640HUDC-1#PBF

Voltage - Output (Min/Fixed):	0.97V
Base Part Number:	LT8640
Supplier Device Package:	20-QFN (3x4)
Package / Case:	20-WFQFN, 18 Leads, Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 150°C (TJ)
Synchronous Rectifier:	Yes
Frequency - Switching:	210kHz ~ 2MHz
Current - Output:	5A
Voltage - Output (Max):	42V
Series:	--
Voltage - Input (Max):	42V
Voltage - Input (Min):	3.4V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Active
Packaging:	Tube

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LT8640HUDC-1#PBF Application Field and Working Principle

Introduction

The LT8640HUDC-1#PBF is a high performance synchronous buck converter which is widely used for power management applications. This converter provides a simple yet reliable and efficient solution for power converters. It is capable of generating 12V from a 2.5V to 5.5V input supply, ensuring maximum efficiency and low noise in the same time. The device is capable of supporting up to 8A of output current and requires only a few external components to operate.

Application Field

The LT8640HUDC-1#PBF is mainly used in a wide range of power managements applications such as industrial, medical and consumer products. It is an ideal solution for applications which require high efficiency, low noise and easy control implementations. The converter is also very suitable for portable applications such as personal electronic devices, notebook computers and cell phones since its size is small and the component count is low.

Features

The LT8640HUDC-1#PBF converter offers several features which make it an ideal solution for power management applications. It is capable of providing up to 8A of output current, and also supports both single and dual output configurations. The device also supports Power Good signal, output voltage select, soft start, internal compensation, and output tracking.

Working Principle

The working principle of the LT8640HUDC-1#PBF involves a 3-phase synchronous buck converter. The input voltage is converted to an intermediate voltage (Vint) which is then further converted to the desired output voltage (Vout). The converter consists of three main stages: rectification, buck-boost, and output stage.

Rectification Stage

The rectification stage consists of two full-bridge rectifiers, with one for each phase of the synchronous buck converter. This stage converts the input voltage to a phase-shifted waveform. The waveform is then used as the switching signal for the synchronous buck converter.

Buck-Boost Stage

The buck-boost stage is the second stage of the converter and consists of two LLC-type transformers and two PWM controllers. The PWM controllers are responsible for regulating the frequency and phase of the switching signals. This stage is responsible for converting the intermediate voltage to the desired output voltage.

Output Stage

The output stage is the last stage of the converter and consists of two synchronous MOSFETs and a low-pass filter. The MOSFETs are responsible for regulating the current flow through the converter. The low-pass filter helps reduce the switching frequency and noise of the output voltage.

Conclusion

The LT8640HUDC-1#PBF is a high performance synchronous buck converter that is widely used for power management applications. It is capable of providing up to 8A of output current and supports both single and dual output configurations. The device also offers several features such as Power Good signal, output voltage select, soft start, internal compensation, and output tracking. The working principle of the LT8640HUDC-1#PBF involves rectification, buck-boost, and output stages which are responsible for converting the input voltage to the desired output voltage.

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