L4973集成电路（IC）的稳压器-DC-DC开关稳压器规格书PDF中文资料

L4973属于集成电路（IC）的稳压器-DC-DC开关稳压器。由意法半导体集团制造生产的L4973稳压器 - DC-DC 开关稳压器DC-DC 开关稳压器 PMIC（电源管理集成电路）产品族中的产品是元器件级设备，用于需要稳定 DC 输入电压和/或将其转换为不同幅度的输出电压的应用。这些器件与称为“控制器”PMIC 的类似产品的区别在于集成了主开关元件，设备提供的电力会通过该元件。

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 0.15Ω) 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).

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