LP2957数据手册集成电路（IC）的线性+开关稳压器规格书PDF

描述 Description

The LP2957 is a 5V micropower voltage regulator with electronic shutdown, error flag, very low quiescent current (150 µA typical at 1 mA load), and very low dropout voltage (470 mV typical at 250 mA load current).Output can be wired for snap-on/snap-off operation to eliminate transition voltage states where µP operation may be unpredictable. Output crowbar (50 mA typical pull-down current) will bring down the output quickly when the regulator snaps off or when the shutdown function is activated.The part has tight line and load regulation (0.04% typical) and low output temperature coefficient (20 ppm/°C typical).The accuracy of the 5V output is ensured at room temperature and over the full operating temperature range.The LP2957 is available in the five-lead TO-220 and DDPAK/TO-263 packages.

特性 Features

• 5V Output within 1.4% Over Temperature (A Grade)
• Easily Programmed for Snap-On/Snap-Off Output
• Ensured 250 mA Output Current
• Extremely Low Quiescent Current
• Low Input-Output Voltage Required for Regulation
• Reverse Battery Protection
• Extremely Tight Line and Load Regulation
• Very Low Temperature Coefficient
• Current and Thermal Limiting
• Error Flag Signals when Output is out of Regulation