L4938ND集成电路（IC）的线性+开关稳压器规格书PDF中文资料

L4938ND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L4938ND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 L4938N is a monolithic integrated dual voltage regulators with two very low dropout outputs and additional functions such as power-on reset and input voltage sense. They are designed for supplying microcomputer controlled systems specially in automotive applications.

■ STANDBY OUTPUT VOLTAGE PRECISION 5V ± 2

■ OUTPUT 2 TRACKED TO THE STANDBY OUTPUT

■ OUTPUT 2 DISABLE FUNCTION FOR STANDBY MODE

■ VERY LOW QUIESCENT CURRENT, LESS THAN 250µA, IN STANDBY MODE

■ OUTPUT 2 VOLTAGE SETTABLE FROM 5 TO 20V

■ OUTPUT CURRENTS : I01 = 50mA, I02 = 500mA

■ VERY LOW DROPOUT (max 0.4V/0.6V)

■ OPERATING TRANSIENT SUPPLY VOLTAGE UP TO 40V

■ POWER-ON RESET CIRCUIT SENSING THE STANDBY OUTPUT VOLTAGE

■ POWER-ON RESET DELAY PULSE DEFINED BY THE EXTERNAL CAPACITOR

■ EARLY WARNING OUTPUT FOR SUPPLY UNDERVOLTAGE

■ THERMAL SHUTDOWN AND SHORT CIRCUIT PROTECTIONS