| 摘要 |
<p>A power management integrated circuit and a control method thereof. A circuit having a structure identical to the structure of a step-down DC-DC circuit and constituted by a power transistor 1 (Q1), a power transistor 2 (Q2), a power transistor 3 (Q3), a controller (C1), and an inductor (L1). The controller (C1) is also used in the reception of an enable signal 1 and an enable signal 2. Within any given period of time, only one is effective between the enable signal 1 and the enable signal 2. When the enable signal 1 is in effect, by controlling the power transistors, the step-down DC-DC circuit is enabled; when the enable signal 2 is in effect, by controlling the power transistors, a LDO circuit is enabled. A selection according to need is enabled between the step-down DC-DC circuit having a relatively low power consumption and the LDO circuit having a relatively high performance, thereby enabling not only a retrenchment in the area of a SOC, but also a relatively low power consumption and a relatively high performance, while the reliability and the stability of the application are reassured.</p> |
