L4974A集成电路（IC）的稳压器-DC-DC开关稳压器规格书PDF中文资料

L4974A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L4974A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 L4974Aisa step down monolithic power switch ing regulator delivering 3.5A 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 efficiencyand very fastswitching times. Features of the L4974A include reset and power fail for micro processors, feed forward line regulation, soft start, limiting current and thermal protection. The device is mountedin a Powerdip16 + 2 + 2 plastic package and requires few external components. Efficient operation at switching frequencies up to 200KHz allows reductionin the size and cost of externalfilter component.

. 3.5A OUTPUT CURRENT

. 5.1V TO 40V OUTPUT VOLTAGE RANGE

. 0 TO 90 DUTY CYCLE RANGE

. INTERNAL FEED-FORWARD LINE REG.

. INTERNAL CURRENT LIMITING

. PRECISE 5.1V ± 2 ON CHIP REFERENCE

. RESET AND POWER FAIL FUNCTIONS

. 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 200KHz

. THERMAL SHUTDOWN

. CONTINUOUS MODE OPERATION