MAX1717降压型控制器适用于笔记本电脑CPU内核的DC-DC转换器，它具有超高速瞬态响应、高直流精度和高转换效率等优点。目前它符合Intel便携机PentiumⅢ(r)规范，内置多路复合器,能够接受两路5位数/模转换器（DAC）的控制信号，输出电压由内部5位DAC调节，可调范围为0.925-2V，输出电压范围为2-28V。MAX1717的内部结构图VBATT2VTO28VREFV+ILIMMAX1717TOFF+5V1-SHOTTONFROM时间比较器QTRIGD/A91BSTTONSQTRIGQRDH1-SHOT限流比较器ΣLX误差放大器OUTPUTSKP/SDN过零比较器REF10kVDD+5V70kCCREFDLSQgggRmmmGNDGNDSFBFBSFBREFREF+12%系统供电VCC-7%+5V欠压、过VGATE压检测R-2R2VD/A转换器基准REF电压多工器/选择A/BD0D1D2D3D4TIME120kMAX1717针脚封装图V+124DHSKP/SDN223LXTIME322BSTFB421D0FBS5MAX171720D1CC619D2VCC718D3TON817D4REF916A/BILIM1015VDDGNDS1114DLVGATE1213GNDMAX1717的各引脚功能引脚号引脚名称引脚功能1V+电池电压输入端2SKP/SDN低噪声模式控制信号输入端/使能控制端3TIME频率设置端4FB反馈输入端5FBS输入电压检测端6CC内部电路滤波端7VCC供电电压输入端开关管开启频率控制端，接地时为1000kHz，接基准电压时为550kHz，开路时为300kHz，8TON接电源VCC时为200kHz。9REF2V基准电压输入端10ILIM限流设置端11GNDS偏置电压输入端12VGATEDAC代码控制端13GND接地端14DL下端开关管驱动信号输出端15VDD供电电压输入端16A/B供电模式设置端17-21D4-D0CPU供电电压模式识别端22BST自举端23LX电感连接反馈输入端24DH上开关管驱动信号输出端输出电压由MAX1717的17-21引脚控制，通过控制这几个引脚的电平组合便可以使输出电压递增或递减。MAX1717的17-21引脚电平与输出电压之间的关系D4D3D2D1D0VOUT(V)000002.00000011.95000101.90000111.85001001.80001011.75001101.70001111.65010001.60010011.55010101.50010111.45011001.40011011.35011101.3001111无CPU100001.275100011.250100101.225100111.200101001.175101011.150101101.125101111.100110001.075110011.050110101.025110111.000111000.975111010.950111100.92511111无CPUMAX1717的典型应用电路图VBATT+5VC5BIASSUPPLYR1C6µµ1F20Ω1FC1715D2VCCVDDCMPSH-3122V+BSTON/OFF2SKP/SDN24CONTROLDHQ1R7L1R6120k1µH0.005ΩV3C7OUTTIME0.1µFA/B=LOW=1.60V21C2A/B=HIGH=1.35VTOVD023CCMAX1717LX20D11419D2DLQ2D1100k18D313GND17D4C48TON1µF9REF4FB5R4FBS2k611CCGNDSC3+5V470pFR516R2150kHIGH/LOWA/B100kTOVREF12ILIMVGATEPOWER-GOODINDICATOR10TOVCC