LM43601PWPR Integrated Circuits (ICs)

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Power management integrated circuits (PMICs) are designed to manage the power supply of a given system, including voltage regulators, power converters, battery management, lighting, so on and so forth. Among these PMICs, voltage regulators are of which there are various kinds, consisting of linear regulators, controllers and DC-DC switching regulators. The latter can further be classified into DC-DC buck, boost and buck-boost, each serving for a different purpose. In this report, the focus is the LM43601PWPR, which belongs to the DC-DC converter category, working under a buck-boost mode.

The LM43601PWPR is a synchronous buck-boost DC-DC converter operating in either buck, boost or buck-boost mode. It is particularly suitable for applications involving a single-cell Li-ion battery alongside two voltage rails of different voltages. It is equipped with an internal millisecond hysteretic control loop, providing a fast and stable response time while regulating an output voltage with a dynamic range of up to 5:1. Additionally, its low quiescent current of 19.2 μA allows for maximum efficiency over an extended period of time.

Coming down to the internal workings of the LM43601PWPR, the first element to consider is its hysteretic control. This is the principal method of controlling the output of the converter, which is to say by monitoring the output voltage and adjusting it using a comparator. On the other side of the converter, the internal Start-up and Multiphase Enable Control module provides the necessary control logic of the converter.

Beyond the control loop, the LM43601PWPR also features a valley current limiting circuit, which controls the maximum current during the valley of an AC input volta. This ensures optimal use of the input current, providing a margin of protection during a sudden surge of current from the input source. This peak current limit is set via the external soft-start capacitor, and this combined with the delayed start-up provides an output voltage transient immunity feature.

The LM43601PWPR contains a slew-rate limiter, which limits the rate of rise and fall of the current across the switching devices. This helps reduce both the input and the output ripple of the converter. Furthermore, the LM43601PWPR provides dynamic voltage scaling as well, which is achieved by operating the external circuitry in a switching-mode, thus allowing the dynamic adjustment of the output voltage. This can be used to counteract alterations in the input voltage, and maintain the desired output voltage despite the external changes.

Given its working and features, the LM43601PWPR can find application in many consumer gadgets and peripherals that require the control of two distinct voltage rails from one Li-ion cell, such as power supplies for automotive, consumer and industrial systems, noise suppression circuits, and so on.

To conclude, the LM43601PWPR is a DC-DC buck-boost converter that manages two voltage rails of different voltages from a single Li-ion cell, with a dynamic range of up to 5:1. Its fast and stable response time is due to the internally integrated hysteretic control, while its peak current limit feature ensures the protection of the input source. Additionally, the LM43601PWPR offers DV/DT immunity, slew-rate limiting and dynamic voltage scaling, providing an ample range of features not often seen in such a compact package.

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