500 mA, 3.3 V Linear Regulator with Auxiliary Control

The CS5231−3 combines a three−terminal linear regulator with circuitry controlling an external PFET transistor thus managing two input supplies. The part provides a 3.3 V regulated output either from the main 5.0 V supply or a 3.3 V auxiliary that switches on when the 5.0 V supply is not present. This delivers constant, uninterrupted power to the load. The CS5231−3 meets Intel’s “Instantly Available” power requirements which follows from the “Advanced Configuration and Power Interface” (ACPI) standards developed by Intel, Microsoft and Toshiba.

Features

• Linear Regulator

− 3.3 V ± 2.0 Output Voltage

− 3.0 mA Quiescent Current @ 500 mA

− Fast Transient Response

− Current Limit Protection

− Thermal Shutdown with Hysteresis

− 450 μA Reverse Output Current

• System Power Management

− Auxiliary Supply Control

− “Glitch Free” Transition Between Two Supplies

• Internally Fused Leads in SOIC−8 Package

CS5231-3GDPR5属于集成电路（IC） > 线性 + 开关稳压器。安森美半导体公司制造生产的CS5231-3GDPR5稳压器 - 线性线性稳压器用于提供稳定的输出电压，无论负载电流、输入电压或环境因素如何变化，这些输出电压通常都要保持不变。它们的工作原理要求输入电压维持在高于所需的输出电压，而且要超出某个最小量，并且在工作时会将输入端的任何多余电压转换为热量。对于大多数应用而言，虽然这种稳压器的效率低于开关模式的稳压器，但它们通常更适合对噪声高度敏感的应用。