SNVSBK2 September 2019 LP8733
The LP8733xx includes two step-down DC/DC converter cores. 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 cores can be configured either for a dual-phase single output configuration or for a single-phase dual output configuration. The buck regulators deliver 0.7-V to 3.36-V regulated voltage rails from a 2.8-V to 5.5-V supply voltage.
The LP8733xx has the following features:
The following parameters can be programmed via registers, the default values are set by OTP bits:
There are two modes of operation for the buck 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 in dual-phase configuration the phases are automatically added and shedded based on the load current level. Lighter output current loads cause the converter to automatically switch into PFM mode for reduced current consumption when forced PWM mode is disabled. The forced PWM mode can be selected to maintain fixed switching frequency at all load current levels.
A block diagram of a single core is shown in Figure 8.