L4989D中文资料低功耗稳压器数据手册ST规格书

描述 Description

The L4989M and L4989MD are monolithic integrated 5 V voltage regulators with a low drop voltage at currents up to 150 mA.

The output voltage regulating element consists in a p-channel MOS and the regulation is performed regardless of input voltage transients up to 40 V. The high precision of the output voltage is obtained with a pre-trimmed reference voltage.

The devices are protected against short circuit and an overtemperature protection switches off the devices in case of extremely high power dissipation.

The L4989M and L4989MD watchdogs are active when the Enable pin is high. Features like reset and watchdog make this devices particularly suitable to supply microprocessor systems in automotive applications.

特性 Features

• AEC-Q100 qualified
• Operating DC supply voltage range 5.6 V to 31 V
• Very low quiescent current with watchdog disabled
• Precision output voltage (±3%)
• Low drop voltage (180 mV typ at Io = 150 mA)
• Reset circuit sensing the output voltage down to 1 V
• Programmable reset delay with external capacitor
• Watchdog disable input
• Programmable watchdog timer with external capacitor
• Thermal shutdown and short circuit protection
• Wide temperature range (Tj = -40°C to 150°C)

简介

L4989D属于集成电路（IC）的线性+开关稳压器。由制造生产的L4989D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。