L4979D集成电路（IC）的线性+开关稳压器规格书PDF中文资料

L4979D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L4979D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

L4979D and L4979MD are low dropout linear regulators with microprocessor control functions such as low voltage reset, watchdog, on/off control. Typical quiescent current is 100 µA in very low output current mode and enabled regulator. The devices drop to 6 µA with not enabled regulators.

On chip trimming results in high output voltage accuracy (2). Accuracy is kept over wide temperature range, line and load variation.

The maximum input voltage is 40 V. The max output current is internally limited. Internal temperature protection disables the voltage regulator output.

Features

■ Operating DC supply voltage range 5.6 V to 31 V

■ Low quiescent current (6 µA typ. @ 25 °C with enable low)

■ High precision output voltage (2)

■ Low dropout voltage less than 0.5 V

■ Reset circuit sensing the output voltage down to 1 V

■ Programmable reset pulse delay with external capacitor

■ Watchdog

■ Programmable watchdog timer with external capacitor

■ Thermal shutdown and short circuit protection

■ Automotive temperature range (Tj = -40 °C to 150 °C)

■ Enable input for enabling/disabling the voltage regulator output