一种大电流LDO稳压器的设计  

Design of a LDO Regulator with a Large Output Current

作　　者：杨燕[1] 赵健雄[1] 陈祝[1] 

机构地区：[1]成都信息工程大学通信工程学院,成都610225

出　　处：《微电子学》2016年第2期198-201,206,共5页Microelectronics

基　　金：国家自然科学基金资助项目(61201094);四川省卓越工程师培养项目

摘　　要：设计了一种最大输出电流为3 A的LDO电路。通过优化误差放大器,并采用两个NMOS管作为调整管,增强了电路上拉和下拉负载电流的能力。采用20μF的陶瓷电容,保证电路具有足够快的负载瞬态响应,在空载时,电路仅消耗80μA的负载电流。该芯片能够驱动高达3A的负载电流,极大地提高了LDO的带载能力,并保持了良好的系统稳定性,具有快速的瞬态响应和较小的输出纹波。A kind of LDO circuit with a maximum output current of 3A was presented.By optimizing the error amplifier and using two NMOS transistors as the adjustment transistors,the circuit’s capability of sinking and sourcing large load current was improved.A 20μF ceramic capacitor was used to ensure the load transient response,and the no-load current was only 80μA.The chip was capable of driving up to 3Aof output current,which had greatly improved the LDO’s load ability.It had a nice system’s stability,and a small output ripple with fast transient response.

关 键 词：LDO 大电流 上拉和下拉负载电流 

分 类 号：TN432[电子电信—微电子学与固体电子学]