<p>SGM61012/SGM61022是一颗低压同步降压型DC-DC转换器芯片，采用了圣邦微电子全新研发的AHP-COT（Adaptive Hysteresis and Pseudo-Constant On-Time Control）架构（专利审查中），具有超快的负载或线电压瞬态响应特点。</p>
<p>为了适应电池供电及功耗敏感型系统的应用，SGM61012/SGM61022可选取深睡模式从而有效降低系统待机功耗。将MODE逻辑置为“高”，芯片在极轻载或空载时自动进入深睡模式（Deep Sleep Mode），典型静态工作电流为9μA。置MODE为逻辑低，进入节能模式（Power-Save Mode），典型静态工作电流为25μA。即使在深睡模式中，SGM61012/SGM61022依然拥有超快瞬态响应的优秀表现。</p>
<p>SGM61012/SGM61022支持2.3V至5.5V电压输入和0.5V至4V电压输出，最大持续输出电流分别可以达到1.2A和2A，输出电压精度全温度下低于±2.7%。芯片内置了实时过温保护功能和逐周期最大电流检测功能，可在短路和过载情况下起到安全有效的保护。</p>
<p><img alt="图1 SGM61012/SGM61022典型应用电路" data-entity-type="file" data-entity-uuid="81bfcae1-49b6-4d43-8d5c-120550541273" src="/sites/default/files/inline-images/%E5%9B%BE1%20SGM61012%E3%80%81SGM61022%E5%85%B8%E5%9E%8B%E5%BA%94%E7%94%A8%E7%94%B5%E8%B7%AF.png" /></p>
<p><em>图1 SGM61012/SGM61022典型应用电路</em></p>
<p><img alt="图2 SGM61012/SGM61022架构简图" data-entity-type="file" data-entity-uuid="b568fd1a-1b28-48a2-86d9-69d2dd0c9f16" src="/sites/default/files/inline-images/%E5%9B%BE2%20SGM61012%E3%80%81SGM61022%E6%9E%B6%E6%9E%84%E7%AE%80%E5%9B%BE.png" /></p>
<p><em>图2 SGM61012/SGM61022架构简图</em></p>
<p><strong>典型特征</strong></p>
<ul>
<li>AHP-COT架构，超快速瞬态响应；</li>
<li>2.3V至5.5V宽输入电压范围；</li>
<li>集成119mΩ和80mΩ MOSFET，用于1.2A/2A连续输出电流；</li>
<li>关断电流小于1μA；</li>
<li>节能模式典型静态电流25μA，深睡模式典型静态电流9μA；</li>
<li>轻载工作于自动降频的非连续导通模式（DCM），中高负载工作于2MHz的连续导通模式（CCM）；</li>
<li>随负载变化可以实现脉宽调制（PFM）与脉冲频率调制（PWM）平滑过渡；</li>
<li>100%的占空比开启功率管；</li>
<li>内部环路补偿；</li>
<li>2.8A/3.5A高侧MOSFET的过流保护；</li>
<li>+160℃过温保护；</li>
<li>-40℃至+125℃工作温度范围；</li>
<li>TDFN-2×2-8AL绿色封装。</li>
</ul>
<p><strong>核心特点</strong></p>
<p>AHP-COT控制架构实现超快的负载瞬态响应，保证VOUT较小的电压降。</p>
<p><img alt="图3 SGM61012 5mA-1A及50mA-1A负载瞬态响应波形" data-entity-type="file" data-entity-uuid="0014de9f-69a9-4b2d-9cd8-8df60deac7f4" src="/sites/default/files/inline-images/%E5%9B%BE3_108.png" /></p>
<p><em>图3 SGM61012 5mA-1A及50mA-1A负载瞬态响应波形</em></p>
<p><img alt="图4 SGM61022 5mA-2A及50mA-2A负载瞬态响应波形" data-entity-type="file" data-entity-uuid="bd3d76cc-1c1e-4a59-8f4d-60c2a7fffe2a" src="/sites/default/files/inline-images/%E5%9B%BE4%20SGM61022%205mA-2A%E5%8F%8A50mA-2A%E8%B4%9F%E8%BD%BD%E7%9E%AC%E6%80%81%E5%93%8D%E5%BA%94%E6%B3%A2%E5%BD%A2.png" /></p>
<p><img alt="图4 SGM61022 5mA-2A及50mA-2A负载瞬态响应波形" data-entity-type="file" data-entity-uuid="166babc2-1d7c-4c8b-a729-8b2e23f6cae6" src="/sites/default/files/inline-images/%E5%9B%BE4_77.png" /></p>
<p><em>图4 SGM61022 5mA-2A及50mA-2A负载瞬态响应波形</em></p>
<p>AHP-COT控制架构也能实现超快的线电压瞬态响应，保证VOUT较小的电压降。</p>
<p><img alt="图5 SGM61012/SGM61022超快的线电压瞬态响应" data-entity-type="file" data-entity-uuid="7f1b7ae7-f8dc-4d89-af74-5fea563e19ae" src="/sites/default/files/inline-images/%E5%9B%BE5%20SGM61012%E3%80%81SGM61022%E8%B6%85%E5%BF%AB%E7%9A%84%E7%BA%BF%E7%94%B5%E5%8E%8B%E7%9E%AC%E6%80%81%E5%93%8D%E5%BA%94.png" /></p>
<p><em>图5 SGM61012/SGM61022超快的线电压瞬态响应</em></p>
<p>稳定的系统工作状态无论在CCM还是在DCM中都能保证较小的输出电压纹波。</p>
<p><img alt="图6 SGM61012/SGM61022 CCM" data-entity-type="file" data-entity-uuid="517e9138-9a63-4a65-87c9-de75e8d2dcfc" src="/sites/default/files/inline-images/%E5%9B%BE6%20SGM61012%E3%80%81SGM61022%20CCM.png" /></p>
<p><img alt="图6 SGM61012/SGM61022 CCM" data-entity-type="file" data-entity-uuid="813a6035-debd-43f7-81fc-3414ff3690d2" src="/sites/default/files/inline-images/%E5%9B%BE6_61.png" /></p>
<p><em>图6 SGM61012/SGM61022 CCM</em></p>
<p><img alt="图7 SGM61012/SGM61022 DCM" data-entity-type="file" data-entity-uuid="7665b620-0e53-4762-9d91-ccfd1f9a1e9d" src="/sites/default/files/inline-images/%E5%9B%BE7%20SGM61012%E3%80%81SGM61022%20DCM.png" /></p>
<p><em>图7 SGM61012/SGM61022 DCM</em></p>
<p>理想的工作效率。</p>
<p><img alt="图8 SGM61012/SGM61022不同条件下的效率表现" data-entity-type="file" data-entity-uuid="596a1fce-f186-4808-adfe-0b6497275961" src="/sites/default/files/inline-images/%E5%9B%BE8%20SGM61012%E3%80%81SGM61022%E4%B8%8D%E5%90%8C%E6%9D%A1%E4%BB%B6%E4%B8%8B%E7%9A%84%E6%95%88%E7%8E%87%E8%A1%A8%E7%8E%B0.png" /></p>
<p><em>图8 SGM61012/SGM61022不同条件下的效率表现</em></p>
<p>当负载渐变时，可实现轻载PFM模式与中等负载PWM模式的平滑过渡，可始终保持较小的输出电压纹波。</p>
<p><img alt="图9 SGM61012/SGM61022 PFM模式与PWM模式切换" data-entity-type="file" data-entity-uuid="517b42ca-4e18-4433-9183-cb617615799e" src="/sites/default/files/inline-images/%E5%9B%BE9%20SGM61012%E3%80%81SGM61022%20PFM%E6%A8%A1%E5%BC%8F%E4%B8%8EPWM%E6%A8%A1%E5%BC%8F%E5%88%87%E6%8D%A2.png" /></p>
<p><em>图9 SGM61012/SGM61022 PFM模式与PWM模式切换</em></p>