SNVSAT4A September 2017 – June 2021 LP873220-Q1
The LP873220-Q1 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 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 LP873220-Q1 has the following features:
The following parameters can be programmed through the 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. 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 7-1.