[原创] Maxim MAX77827高效升压－降压6μA静态电流稳压器解决方案

Maxim公司的MAX77827是高效升压-降压稳压器,具有业界最低的6μA静态电流,目标用在单颗锂电池能源的设备.支持输入电压1.8V-5.5V,输出电压在2.3V-5.3V,提供两种不同的开关电流(1.8A和3.1A),以便基于已知负载电流条件来优化外接元件尺寸.1.8A开关电流限制工作,在降压模式支持高达1.0A负载电流,而升压模式支持900mA负载电流(VIN = 3.0V, VOUT = 3.3V).作为DC/DC转换器,峰值效率96%.器件具有可调输出电压,通过单个电阻可编程在2.3V到5.3V,GPIO引脚可支持PWM使能功能和电源良好(POK)指示器.它的独到控制算法具有高效率,杰出的线路/负载瞬态响应,并能在降压和升压模式中无缝转换.开关频率2.5MHz,器件具有UVLO,软起动,主动输出放电功能,过流和热关断保护等.主要用在单个锂电池电源设备,智能手机/手持设备/可穿戴,物联网设备(IoT)以及NB-IoT设备.本文介绍了MAX77827主要优势和特性,简化框图和功能框图,典型应用电路图以及评估板MAX77827 EVK主要特性和指标,电路图,材料清单和PCB设计图.

The MAX77827 is a high-efficiency buck-boost regulator targeted for one-cell Li-ion powered applications with the lowest typical quiescent current in the industry of 6μA. It supports input voltages of 1.8V to 5.5V and an output volt­age range of 2.3V to 5.3V. The IC provides two different switching current levels (1.8A and3.1A) to optimize exter­nal component sizing based on given load current require­ments.

With the 1.8A switching current-limit option, the IC can support up to 1.0A load current in buck mode and 900mA in boost mode (VIN = 3.0V, VOUT = 3.3V).
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