The LP87524B/J/P-Q1 includes four step-down DC-DC converter cores configured for four single-phase outputs. The cores are designed for flexibility; most of the functions are programmable, thus giving a possibility to optimize the regulator operation for each application.
The LP87524B/J/P-Q1 has the following features:
The following parameters can be programmed via registers:
There are two modes of operation for the converter, depending on the output current required: pulse-width modulation (PWM) and pulse-frequency modulation (PFM). The converter operates in PWM mode at high load currents of approximately 600 mA or higher. Lighter output current loads cause the converter to automatically switch into PFM mode for reduced current consumption when forced-PWM mode is disabled.
A multi-phase synchronous buck converter offers several advantages over a single power stage converter. For application processor power delivery, lower ripple on the input and output currents and faster transient response to load steps are the most significant advantages. Also, because the load current is evenly shared among multiple channels in multi-phase output configuration, the heat generated is greatly reduced for each channel due to the fact that power loss is proportional to square of current. The physical size of the output inductor shrinks significantly due to this heat reduction. A block diagram of a single core is shown in Figure 5.