Overview:
Portable electronic systems are characterized by low cost, small size, and light weight. When designing a charging system and requiring power to the onboard system, the power management ICMAX8671X can be used to easily implement the above features. The MAX8671X can receive power from a USB pin or an external AC/DC power adapter while charging. In addition to battery charging, the MAX8671X has five independent on-chip power regulators that can be used to obtain multiple different power outputs. The USB and DC inputs have an overvoltage protection switch.
This solution allows designers to eliminate the AC/DC power adapter in retail packaging and provide it in the aftermarket, which reduces packaging and weight at retail, making full use of shipping containers and reducing shipping costs. The production and sales company can therefore only provide a USB cable through which the consumer can charge the product from the USB port of the computer. Consumers can also purchase AC/DC power adapters or AC to USB adapters in the consumer electronics retail market.
The MAX8671X integrates multiple features to meet a variety of application needs. 5 independent power regulators (3 2MHz step-down switching power supplies with up to 96% efficiency; two low quiescent current linear power supplies) can power multiple subsystems and can be powered by AC/DC adapter or USB cable; integrated power supply The switched lithium battery charger manages battery charging and power distribution and sets the appropriate voltage and current based on voltage and current profiles.
The intelligent power supply selection module integrates a MOSFET Q3 that can be used as a load switch and a charge switch, respectively. When no external power supply is available or the input current limit is lower than the system load current, Q3 acts as the load switch and the battery participates in the system power supply. When the external power supply is available and there is no overload, Q3 acts as a charging switch.
Integrated Reduced Chaos For integrated overvoltage protection on DC/USB inputs, single-cell Li+ battery charging, and switching loads between battery and external power supply, an integrated power switch is essential. And integrated switches and power regulators avoid the use of external MOSFETs and voltage detectors, current sense resistors, comparators, timers, and other discrete devices for power management. This reduces the number of components and the footprint of the PCB, reducing cost and system weight.
Efficient on-chip voltage regulators reduce power loss, maximize battery life, and provide high efficiency at both heavy and light loads. This feature is beneficial for certain subsystems that have peak load currents of several hundred milliamps in a short period of time and are much smaller than this peak current most of the time, further extending battery life.
Many portable devices are spent "sleeping" during use. Therefore, if the voltage regulator can achieve more than 90% efficiency at full load and less than 60% at idle time, the battery power will be more than that of a voltage regulator that provides high conversion efficiency under light and heavy load conditions. It is quickly consumed. The MAX8671X delivers 425mA to the system load with 96% efficiency, and maintains efficiency above 85% when powered at 1mA.
MAXIM can provide a low dropout voltage regulator that allows the input supply range to be between 1.7V and 5.5V. This gives the system designer greater flexibility to power the LDO from an on-chip switching power supply for power savings.
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