L4975集成电路（IC）的稳压器-DC-DC开关稳压器规格书PDF中文资料

L4975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L4975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 L4975A is a stepdown monolithic power switching regulator delivering 5A at a voltage variable from 5.1 to 40V.

Realized with BCD mixed technology, the device uses a DMOS output transistor to obtain very high efficiency and very fast switching times. Features of the L4975A include reset and power fail for microprocessors, feed forward line regulation, soft start, limiting current and thermal protection. The device is mounted in a 15-lead multiwatt plastic power package and requires few external components. Efficient operation at switching frequencies up to 500KHz allows reduction in the size and cost of external filter components.

■ 5A OUTPUT CURRENT

■ 5.1V TO 40V OUTPUT VOLTAGE RANGE

■ 0 TO 90 DUTY CYCLE RANGE

■ INTERNAL FEED-FORWARD LINE REGULATION

■ INTERNAL CURRENT LIMITING

■ PRECISE 5.1V ± 2 ON CHIP REFERENCE

■ RESET AND POWER FAIL FUNCTIONS

■ SOFT START

■ INPUT/OUTPUT SYNC PIN

■ UNDER VOLTAGE LOCK OUT WITH HYSTERETIC TURN-ON

■ PWM LATCH FOR SINGLE PULSE PER PERIOD

■ VERY HIGH EFFICIENCY

■ SWITCHING FREQUENCY UP TO 500KHz

■ THERMAL SHUTDOWN

■ CONTINUOUS MODE OPERATION