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

L4975A屬于集成電路（IC） > 穩(wěn)壓器 - DC-DC 開關(guān)穩(wěn)壓器。意法半導體（ST）集團制造生產(chǎn)的L4975A穩(wěn)壓器 - DC-DC 開關(guān)穩(wěn)壓器DC-DC 開關(guān)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(shè)備，用于需要穩(wěn)定 DC 輸入電壓和/或?qū)⑵滢D(zhuǎn)換為不同幅度的輸出電壓的應(yīng)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(guān)元件，設(shè)備提供的電力會通過該元件。