8500-ds_0.pdf

The EM8500 is an integrated power management solution for low power applications. It is specifically designed for efficient operation with a variety of DC harvesting sources including thermal electric generators (TEG) or photovoltaic (solar) sources in the μW to mW range. The device is designed to speed-up system start-up time when the main energy storage element (aka Long Term Storage – LTS) is completely discharged or insufficiently charged to supply the application, by using a secondary energy storage element (Short Term Storage - STS). When using a non-rechargeable primary battery the EM8500's on- board PMU offers a mechanism to extend battery life when assisted by a harvesting element. The EM8500 incorporates a boost converter able to start with an input voltage as low as 300 mV and an input power of few μW. In functional mode the EM8500 operates at energy levels from a DC harvesting source as low as 100 mV and 1 μW. To maximize harvesting efficiency the EM8500 integrates a programmable maximum power point tracking controller. The EM8500 is capable of working with a variety of energy elements as secondary storage, namely re-chargeable batteries, super-capacitors or conventional capacitors. In all cases the EM8500 maintains its fast start-up capability that depends only on the harvester conditions and the STS capacitor value. A USB connection to an external power source is available on the EM8500 for fast charge of the long term storage element. The EM8500 integrates voltage supervisory functions. Minimum and maximum voltages are controlled on the LTS element to prevent damage to the energy storage element. Harvester minimum voltage monitoring allows stopping the DCDC limiting power loss when no energy can be harvested. Output voltages are kept in a safe range for the application. To perform granular power management of the application, the EM8500 integrates four independent supply outputs and a sleep mode offering the capability to switch off part or all the supplies. The EM8500 is available in an industry standard QFN24 4x4 package or as a solder bump flip-chip device. EM8500是一款专为低功耗应用设计的高度集成化的电源管理解决方案。该器件特别适用于微瓦到毫瓦范围内的各种直流能量采集源，包括热电发电机(TEG)或光伏（太阳能）源。其核心功能是通过利用辅助的次级能量存储元件（短时存储-STS）来加速系统启动时间，当主要的能量存储元件（长期存储-LTS）完全放电或充电不足，无法供应应用时。 EM8500内置了一个升压转换器，能够以低至300毫伏的输入电压和几微瓦的输入功率启动。在正常工作模式下，它可以在直流能量采集源提供的低至100毫伏和1微瓦的能量水平下运行。为了最大化能量采集效率，EM8500集成了一个可编程的最大功率点跟踪控制器，能够根据能源条件自动调整，以获取最大可能的功率输出。 该芯片支持多种类型的二次储能元件，包括可充电电池、超级电容器或常规电容器。无论使用哪种类型的储能元件，EM8500都能保持快速启动能力，这仅取决于能源采集器的状态和STS电容值。此外，EM8500还提供USB接口，可以连接外部电源，快速为长期存储元件充电。 EM8500集成了电压监控功能，可以设定LTS元件的最小和最大电压阈值，防止对储能元件造成损害。通过监测采集器的最低电压，当无法再获取能量时，可以停止DC/DC转换，避免无谓的功率损失。同时，输出电压将被保持在一个安全的范围内，以确保应用的稳定运行。 为了实现精细的电源管理，EM8500提供了四个独立的电源输出和睡眠模式，可以根据需要关闭部分或全部供电。这样可以有效地降低系统功耗，延长整体电源寿命，尤其是在辅助有能量采集源的情况下，对于非可充电的一次性电池，能显著延长其使用寿命。 封装方面，EM8500采用标准的QFN24 4x4封装，或者作为焊球倒装芯片设备，适应不同的应用需求。这款芯片由EM Microelectronic-Marin SA制造，适用于各种低功耗、需要高效能管理和能量采集的应用场景。