【产品】圣邦微支持18V高压输入的开关型锂电池充电器SGM41523，可设充电电流0.2A至2.5A
圣邦微电子（SGMICRO）推出可支持18V高压输入的紧凑、开关型锂电池充电器SGM41523系列，产品适用范围广，使用灵活。SGM41523是简便易用、功能完整的恒流恒压型开关充电器。其充电电压和电流均可使用电阻设置，且充电电流在0.2A至2.5A范围内可设，常见的满充截止电压4.1V、4.2V、4.3V、4.35V、4.4V、4.45V可设。其典型应用电路如下图所示：
SGM41523主要特性
· 18V最高耐压承受能力；
· 2.5A恒流充电电流能力；
· 13.2V输入过压保护；
· 4.1V至4.45V电池满充电压；
· 充电电压和电流利用电阻灵活设置；
· 充电和充满指示灯；
· 高达95%充电效率；
· 1.3MHz开关频率；
· 充满后输出电压回退保持；
· 可选充电使能电平；
· 可选的JEITA适配性；
· 工作温度范围-40℃至+85℃；
· 符合环保理念的TDFN-3×3-12L绿色封装。
SGM41523具有优异的充电效率曲线，如图2所示。5V充电时峰值充电效率可高达95%，非常适用于充电电流300mA至2A的应用，这个区间内可保持90%以上的充电效率。
SGM41523具有完整的涓流充电、预充电、恒流充电和恒压充电等充电流程，如图3所示。电池电压低于2.2V时以典型值38mA的ISHORT进行涓流充电，电池电压为2.2V至3V时以IPRECHG = ICHARGE/10进行预充电，此后进入恒流ICHARGE和恒压充电阶段并最终充电截止，截止电流ITERM=ICHARGE/10。
有没有注意到上图充电流程的恒压阶段后还有一段折返（Fold-Back）？是的，你没看错，这是我们特意设计的一种模式，我们叫它电压回退保持模式。顾名思义，也就是输出电压回落到一个预定值。
为什么要设计这个模式？它有什么特殊之处？
SGM41523没有采用电池开关将电池与系统负载断开，当电池充满后，它进入电压回退保持模式，适当降低输出电压后，再以稳压电源模式为系统负载供电，保证电池安全、节约成本的同时可大大延长使用寿命。在该模式下，其输出电流能力可达3A，不受充电电流设置的限制，避免了在放电通路中由于电池开关插入导致的损耗，大幅提高了电池能量利用率。这个模式对无电池状态仍需工作的设备非常适用。
SGM41523系列产品中使能电平具有高、低有效两种可选，低电平使能的大家比较常见，此处不再累述。高电平使能（如SGM41523B）对于用作辅充很有必要，用户仅在需要开启时才配置开启。
SGM41523B与SGM41516D并联充电电流可达5A，且平均效率可达92%以上，如下图5所示。
SGM41523可利用NTC（推荐103AT-2）对电池温度侦测并根据电池温度调整充放电以确保充放电过程安全、可控。SGM41523系列产品预留有多种温控规格，如T2有10℃和15℃可选，45℃至60℃范围是否允许充电可选等，这大大方便了客户适配不同温度特性锂电池的需求。SGM41523的NTC温度特性如下表所示：
SGM41523可支持两颗LED（见前方典型应用图）以指示电池的充电状态。充电时LED1开启，充电关闭或充满时LED2开启，而处在输入过压、高温、低温等异常状态时LED交替闪烁。
SGM41523订购信息
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本文由犀牛先生转载自SGMICRO，原文标题为:圣邦微电子紧凑型高压输入2.5A开关型锂电池充电器SGM41523，本站所有转载文章系出于传递更多信息之目的，且明确注明来源，不希望被转载的媒体或个人可与我们联系，我们将立即进行删除处理。
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线性充电、开关充电、电荷泵充电。1-4节锂电池充放电管理，IIC控制。4A、6A、8A、10A开关充电电流，充电电流可调。
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产品型号
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品类
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VIN (Min)(V)
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VIN (Max)(V)
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OVP Threshold(V)
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Charge Voltage (V)
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SHDN Iq(μA)
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Status Indication
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Package
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SGM4056
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Li-Ion Battery Charger
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4.55
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26.5
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6.8, 10.5
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4.2
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200
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Status Indication
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SOIC-8(EP) TDFN-3×3-8L
TDFN-2×3-8L TDFN-2×2-8 |
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可自由定制铜排形状尺寸；检测精度：0.5%~1.0；电流测量范围 ±300-500A。低噪音 (0.27mVpp)；低磁力残余误差:2mV；响应性能<4μSec；支持RoHS指令 、AEC-Q200。
最小起订量： 100个 提交需求>
可自由定制电池形状，锂离子聚合物/磷酸铁锂成分，放电倍率Max. 50C （持续放电倍率） / 150C （脉冲放电倍率），充电倍率：Max. 5，厚度可达0.5mm。
最小起订量： 5000 提交需求>
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