LP6491数据手册LPSemi中文资料规格书

描述 Description

The LP6491 is a compact, high efficiency, high speed synchronous monolithic step-down switching regulator designed to power 5V USB applications. A precise output voltage and programmable cable drop compensation maintain accurate 5V regulation at the USB socket connected to the end of a long cable. Forced continuous operation allows the LP6491 to sink current, further enhancing accurate 5V regulation during load transients. Accurate and programmable input/output current limit, an input current monitor pin and an output current monitor pin improve system reliability and safety, allow the user to implement latch-off or auto-retry functionality and can eliminate the need for a USB switch IC. Dual feedback allows regulation on the output of a USB switch, protecting USB devices during fault conditions. Thermal shutdown provides additional protection by limiting power dissipation in the IC during an over temperature fault. The LP6491 is available in an ESOP8 package and is rated over the -40°C to 85°C temperature range.

特性 Features

· Input Voltage Range: 9V to 35V
· Max Load Current : 5A
· Programmable Input and Output Current Limit
· Up to 95% Efficiency
· 100% Duty Cycle in Dropout
· 180KHz Switching Frequency
· Soft star Function
· Short Circuit Protection
· Current Mode Operation
· Thermal Fault Protection
· ESOP-8 Package
· RoHS Compliant and 100% Lead (Pb)-Free

应用 Application

· Portable Media Players
· Cellular and Smart mobile phone
· PDA/DSC
· GPS Applications