摘要
提出了一种用于电源管理系统的高电压、低功耗CMOS线性稳压器。通过使用所提出超级源极跟随器,位于功率管栅极的内部非主极点能够很容易地被推到单位增益带宽以外而不消耗大的静态电流,因此,有效减小了内部补偿电容;通过使用动态频率补偿技术,稳压器能在整个负载电流范围内稳定。提出的超级源极跟随器通过在功率管栅极处增加充电通道和放电通道改善了瞬态响应。该方法在降低功耗的同时,得到了快速且安全的上电瞬态响应和快速的负载变化瞬态响应.使用0.5μm高压n阱CMOS工艺,外接R_(ESR)为10 mΩ的0.47μF负载电容时,仿真发现,该稳压器表现出良好的稳定性和瞬态响应,而仅消耗10μA的静态电流.
A high-voltage,low-power CMOS linear regulator used in a power management system is proposed. With the proposed super source follower,the non-dominant pole generated at the gate of the power transistor can be easily pushed away from the unity-gain frequency（UGF） without dissipating large quiescent current, so the internal compensating capacitor is effectively reduced;ith dynamically frequency compensation method,the regulator achieves stability under the full range of the load current.The proposed super source follower also improves transient response through adding a charging path and a discharging path at the gate of the power transistor.This method provides power saving,and at the same time enables a fast and safe power-on transient response and a fast load transient response.Simulated in a 0.5μm high-voltage n-well CMOS process, the regulator shows good stability and transient responses with a 0.47μF-10 mΩintrinsic equivalent series resistor （ESR） load capacitor while consuming only 10μA quiescent current.
出处
《南开大学学报（自然科学版）》
CAS
CSCD
北大核心
2010年第1期52-59,共8页
Acta Scientiarum Naturalium Universitatis Nankaiensis
基金
2007 the year of Major High-tech Industrialization Projects in Tianjin(0721919M7710009)
关键词
稳压器
LDO
瞬态响应
超级源极跟随器
动态频率补偿
regulator
LDO
transient response
super source follower
dynamically frequency compensation
