JAJSF48 March 2018 LP87561-Q1 , LP87562-Q1 , LP87563-Q1 , LP87564-Q1 , LP87565-Q1
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The LP8756x-Q1 includes four step-down DC/DC converter cores which can be configured for:
The LP8756x-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. When operating in PWM mode the phases of a multiphase regulator are automatically added/shedded based on the load current level. Lighter output current loads cause the converter to automatically switch into PFM mode for decreased current consumption when forced-PWM mode is disabled. The forced multiphase mode can be enabled for highest transient performance.
A multiphase synchronous buck converter offers several advantages over one 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 multiphase output configuration, the heat generated is greatly decreased 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. Figure 9 shows a block diagram of a single core.
Interleaving switching action of the multiphase converters is shown in Figure 10.