AMC1204 Application Guide

南麟LN1139BAMR

Manufacturers supply LED lamp bead SMD LED 0805 yellow light super bright indicator light dedicated

MP24AE off-the-shelf supply

Overview:
Abstract This paper first introduces the PMU briefly, which helps the reader understand the basic functions and selection methods of the PMU. Secondly, it mainly introduces some incomprehensible parts of the LP3925 data sheet, such as the setting of multi-function input and output ports, which helps the reader to better understand the flexibility and configurability of the LP3925 and deepen the understanding of LP3925. In addition, some notes on the practical use of LP3925 and solutions to some common problems are introduced. It can help the reader to avoid some problems that may be encountered in actual use and shorten the debugging time.

1. Recognize the power management unit (hereinafter referred to as PMU)
1.1 What is PMU?

The PMU is a chip that typically integrates several power supplies required by the electronic system to simplify the power supply design of the system while meeting the needs of system miniaturization;
PMU can be said to be developed along with the power requirements and miniaturization requirements of electronic systems. Today, PMUs cover not only small power systems that integrate several DC/DC and LDOs, but also many other functions (such as A complete power management system for chargers, analog-to-digital converters, comparators, real-time clock RTC, etc.).

1.2 Basic considerations for PMU selection

For the PMU, the most basic function is to supply power to the electronic system, so the first thing to look at is the power supply capability and timing, such as DC/DC, the number of LDOs, and the drive capability of the current. The default output voltage setting and power-on and power-down timing can satisfy the system. Requirements.
Secondly, look at the auxiliary functions that other systems need, such as battery charge management, ADC, RTC, comparator, etc. • Of course, the more complex the PMU is, the better the function is. The PMU that best meets the system requirements is the most suitable considering various factors such as system wiring, heat dissipation, and debugging time.
(Please read the PDF for details)