L4973V3.3屬于集成電路（IC）的穩(wěn)壓器-DC-DC開關穩(wěn)壓器。由意法半導體集團制造生產(chǎn)的L4973V3.3穩(wěn)壓器 - DC-DC 開關穩(wěn)壓器DC-DC 開關穩(wěn)壓器 PMIC（電源管理集成電路）產(chǎn)品族中的產(chǎn)品是元器件級設備，用于需要穩(wěn)定 DC 輸入電壓和/或?qū)⑵滢D換為不同幅度的輸出電壓的應用。這些器件與稱為“控制器”PMIC 的類似產(chǎn)品的區(qū)別在于集成了主開關元件，設備提供的電力會通過該元件。

描述 Description

The L4973 is a step down monolithic power switching regulator delivering 3.5A at fixed voltages of 3.3V or 5.1V and using a simple external divider output adjustable voltage up to 50V. Realized in BCD mixed technology, the device uses an internal power D-MOS transistor (with a typical RDS(on) of 0.15?) to obtain very high efficiency and very fast switching times. Switching frequency up to 300KHz are achievable (the maximum power dissipation of the packages must be observed).

特性 Features

■ Up to 3.5A step down converter

■ Operating input voltage from 8V to 55V

■ 3.3V and 5.1V (±1) fixed output, and adjustable outputs from:

– 0.5V to 50V (3.3 type)

– 5.1V to 50V (5.1 type)

■ Frequency adjustable up to 300kHz

■ Voltage feed forward

■ Zero load current operation (min 1mA)

■ Internal current limiting (pulse by pulse and HICCUP mode)

■ Precise 5.1V (1.5) reference voltage externally available

■ Input/output synchronization function

■ Inhibit for zero current consumption (100mA typ. at VCC = 24V)

■ Protection against feedback disconnection

■ Thermal shutdown

■ Output over voltage protection

■ Soft start function