L4978集成电路（IC）的稳压器-DC-DC开关稳压器规格书PDF中文资料

L4978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L4978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 L4978 is a step down monolithic power switching regulator delivering 2A at a voltage between 3.3V and 50V (selected by a simple external divider). Realized in BCD mixed technology, the device uses an internal power D-MOS transistor (with a typical Rdson of 0.25Ω) to obtain very high efficency and high switching speed.

特性 Features

■ UP TO 2A STEP DOWN CONVERTER

■ OPERATING INPUT VOLTAGE FROM 8V TO

55V

■ PRECISE 3.3V (±1) INTERNAL

REFERENCE VOLTAGE

■ OUTPUT VOLTAGE ADJUSTABLE FROM

3.3V TO 50V

■ SWITCHING FREQUENCY ADJUSTABLE UP

TO 300KHz

■ VOLTAGE FEEDFORWARD

■ ZERO LOAD CURRENT OPERATION

■ INTERNAL CURRENT LIMITING (PULSEBYPULSE AND HICCUP MODE)

■ INHIBIT FOR ZERO CURRENT

CONSUMPTION

■ PROTECTION AGAINST FEEDBACK

DISCONNECTION

■ THERMAL SHUTDOWN

■ SOFT START FUNCTION