Big Current Buck Product Type

It is easy to output more than 100 amps, and there are many functions, the RT3609BE we said is a homoegen, not only applied the circuit components, but also the pin, the chip's footprint is also a lot, 7mm x 7mm = 49mm2. Each phase control signal output by the RT3609BE is a PWM signal. This is a pure digital signal that needs to be converted to the MOSFET drive signal to enter the power stage circuit, so the gate driver is added in use. The figure below is the internal circuit block diagram of the gate driver RT9624A: To simplify the circuit, reduce the occupancy area, sometimes you can use the DRMOS that integrate the gate driver and MOSFET power switch, and the figure below is a circuit structure. The circuit after DRMOS will appear to be relatively simple, and the differences in the two practices can be seen from the schematic below. Some products can integrate some of the gate drivers and retain a part of the PWM output, which can simultaneously taking into account the need for integrated and decentralization, and RT3602AM is an example: RT3602AM provides 3 sets of outputs, which integrates 3 gate drivers while retaining a PWM output, which contains a gate driver and PWM output common two phases. If the MAIN this group is enough, it is enough, and the one of the PWM output can be discarded. Its application circuit is simplified into the picture below, saves a chip. If you still want to compress the circuit, you can only integrate MOSFET, which is very unreal in the current current, but it is possible in applications where current is relatively small. The following circuit is like this. An example: The RT5800 is an integrated chip containing 4 synchronous Buck converters, each of which can output up to 5.5A of current. The 4 Buck converters of the RT5800 can be configured to form two outputs or 3 output devices in the form of 2 + 2 or 2 + 1 + 1, so that one output can be the load capacity of 11A, which can be satisfied. Some CPUs or GPUs in embedded applications are relatively large current demand. The operating state and parameters of the RT5800 can use the commands sent by the I2C bus to perform control and adjustment, the output voltage range is 0.3V-1.85V, the operating frequency can be up to 3.4MHz, the number of peripheral components is small, the size is small, and for embedded applications Very good. The RT5800 is in the design of imaginary applications in the field of vehicle, so it will be more considerations for security. Its pin layout is made on the basis of FMEA, the failure mode and its effect analysis, even if it encounters special faults in use, you can rest assured in your application. use it. Reprinted from Richtektechnology.

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