PM6681A集成电路（IC）的线性稳压器控制器规格书PDF中文资料

PM6681A属于集成电路（IC）的线性稳压器控制器。由意法半导体集团制造生产的PM6681A稳压器 - 线性 + 开关此产品族中的产品用于构建执行 DC-DC 转换或电压调节功能的电路，采用的是开关模式和线性稳压器功能的组合。虽然具体的拓扑各不相同，但此类产品的主要目的是将开关模式技术的效率优势与线性稳压技术的低噪声特性结合在一起。

描述 Description

PM6681A is a dual step-down controller specifically designed to provide extremely high efficiency conversion, with lossless current sensing technique. The constant on-time architecture assures fast load transient response and the embedded voltage feed-forward provides nearly constant switching frequency operation. An embedded integrator control loop compensates the DC voltage error due to the output ripple. Pulse skipping technique increases efficiency at very light load. Moreover a minimum switching frequency of 33 kHz is selectable to avoid audio noise issues. The PM6681A provides a selectable switching frequency, allowing three different values of switching frequencies for the two switching sections. The output voltages OUT1 and OUT2 can be adjusted from 0.9 V to 5 V and from 0.9 V to 3.3 V respectively. The device provides also 2 LDOs, 5 V fixed and 0.9 V - 3.3 V adjustable.

特性 Features

■ 6 V to 36 V input voltage range

■ Adjustable output voltages

■ 0.9 - 3.3 V LDO adjustable delivers 100 mA peak current

■ 5 V LDO delivers 100 mA peak current

■ 1.237 V ±1 reference voltage available

■ No RSENSE current sensing using low side MOSFETs RDS(on)

■ Negative current limit

■ Soft-start internally fixed at 2 ms

■ Soft output discharge

■ Latched UVP

■ Not-latched OVP

■ Selectable pulse skipping at light loads

■ Selectable minimum frequency (33 kHz) in pulse skip mode

■ 5 mW maximum quiescent power

■ Independent Power Good signals

■ Output voltage ripple compensation

Applications

■ Embedded computer system

■ FPGA system power

■ Industrial applications on 24 V

■ High performance and high density DC-DC modules

■ Notebook computer