With most regulators, it is difficult to generate an output voltage that is less than the reference voltage. This note describes a way to use the MAX1864 to achieve an output voltage less than its 1.236V reference. The MAX1864 includes a positive linear regulator gain block. With a few external resistors, it can achieve an output voltage below 1.236V. Figure 1 shows the schematic of the implementation. Since the voltage at the FB pin is the reference voltage, a lower output voltage, VOUT1, is obtained if a voltage (V2) higher than the reference voltage is generated. Due to the high input impedance at the FB pin, if R5 is chosen to be equal to R6, we have V2-VFB = VFB-VOUT1, This yields V2 = 2VFB-VOUT1. To generate a 1.0V output voltage with VFB=1.236V, V2 should then be 1.472V. This can be achieved by properly choosing the resistance of R8 and R9: If R8 = 10k, then R9 will be 52.4k. Therefore, a 1.0V output voltage is generated. Figure 1. Schematic of 1.0V power supply with the MAX1864. 相关型号   APP 906: Dec 27, 2001 MAX1864 用于xDSL/电缆调制解调器的三/五路输出电源 完整的数据资料 (PDF, 380kB) 免费样品 自动更新 需要自动接收最新发布的应用笔记吗？请订阅EE-Mail™ (English only)。 我们期待您的反馈！ 喜欢？不喜欢？有待改善？或为我们提供建议？请与我们联系 — 我们将根据您的意见或建议改善我们的工作。 网页评价或提供建议   下载，PDF格式 (34kB)  AN906, AN 906, APP906, Appnote906, Appnote 906