L6984中文资料36 V 400 mA同步降压开关稳压器数据手册ST规格书

描述 Description

The L6984 is a step-down monolithic switching regulator able to deliver up to 400 mA DC. The output voltage adjustability ranges from 0.9 V. The fixed 3.3 V VOUT requires no external resistor divider. The “Low Consumption Mode” (LCM) is designed for applications active during car parking, so it maximizes the efficiency at light load with controlled output voltage ripple. The “Low Noise Mode” (LNM) makes the switching frequency almost constant over the load current range, serving low noise application specification like car audio/sensors. The PGOOD open collector output can implement output voltage sequencing during the power-up phase. The synchronous rectification, designed for high efficiency at medium - heavy load, and the high switching frequency capability make the size of the application compact. Pulse-by-pulse current sensing on low-side power element implements an effective constant current protection.

特性 Features

• 400 mA DC output current
• 4.5 V to 36 V operating input voltage
• Synchronous rectification
• Low consumption mode or low noise mode
• 75 μA IQ at light load (LCM VOUT = 3.3 V)
• 13 μA IQ-SHTDWN
• Adjustable fSW (250 kHz - 600 kHz)
• Output voltage adjustable from 0.9 V
• No resistor divider required for 3.3 V VOUT
• VBIAS maximizes efficiency at light load
• 350 mA valley current limit
• Constant on-time control scheme
• PGOOD open collector
• Thermal shutdown

简介

L6984属于集成电路（IC）的稳压器-DC-DC开关稳压器。由ST制造生产的L6984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。