L7987中文资料具有可调电流限值的61 V 3 A异步降压开关稳压器数据手册ST规格书

描述 Description

The L7987 device is a step-down monolithic switching regulator able to deliver up to 3 A DC. The output voltage adjustability ranges from 0.8 V to VIN. The wide input voltage range and the 100% duty cycle capability meet the fail safe specifications for industrial systems. The embedded switchover feature on the VBIASpin maximizes the efficiency at light load. The adjustable current limitation, designed to select the inductor RMS current accordingly with the nominal output current, and the high switching frequency capability make the size of the application compact. Pulse-by-pulse current sensing with digital frequency foldback implements an effective constant current protection over the different application conditions. The peak current foldback decreases the stress of the power components in heavy short-circuit condition. The PGOOD open collector output can also implement output voltage sequencing during the power-up phase. Multiple devices can be synchronized sharing the SYNCH pin to prevent beating noise in low noise applications like sensors with A/D conversion.

特性 Features

• 3 A DC output current
• 4.5 V to 61 V operating input voltage
• RDS,ON= 250 mΩ typ.
• Adjustable fSW(250 kHz - 1.5 MHz)
• Low IQ-SHD (11 μA typ. from VIN)
• Low IQ (1 mA typ. - VIN24 V - VOUT3.3 V)
• Output voltage adjustable from 0.8 V to VIN
• Synchronization
• Adjustable soft-start time
• Adjustable current limitation
• Low dropout operation (12 μs max.)
• VBIASimproves efficiency at light load
• PGOOD open collector output
• Output voltage sequencing
• Digital frequency foldback in short-circuit
• Peak current foldback in short-circuit
• Auto-recovery thermal shutdown

简介

L7987属于集成电路（IC）的稳压器-DC-DC开关稳压器。由制造生产的L7987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。