L4949ED集成电路（IC）的线性+开关稳压器规格书PDF中文资料

L4949ED属于集成电路（IC）的线性+开关稳压器。由意法半导体集团制造生产的L4949ED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。

DESCRIPTION

The L4949E is a monolithic integrated 5V voltage regulator with a very low dropout output and additional functions as power-on reset and input voltage sense. It is designed for supplying the microcomputer controlled systems especially in automotive applications.

■ OPERATING DC SUPPLY VOLTAGE RANGE 5V - 28V

■ TRANSIENT SUPPLY VOLTAGE UP TO 40V

■ EXTREMELY LOW QUIESCENT CURRENT IN STANDBY MODE

■ HIGH PRECISION STANDBY OUTPUT VOLTAGE 5V±1

■ OUTPUT CURRENT CAPABILITY UP TO 100mA

■ VERY LOW DROPOUT VOLTAGE LESS THAN 0.5V

■ RESET CIRCUIT SENSING THE OUTPUT VOLTAGE

■ PROGRAMMABLE RESET PULSE DELAY WITH EXTERNAL CAPACITOR

■ VOLTAGE SENSE COMPARATOR

■ THERMAL SHUTDOWN AND SHORT CIRCUIT PROTECTIONS