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.

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

PM6681ATR屬于集成電路（IC） > 線性穩(wěn)壓器控制器。意法半導(dǎo)體（ST）集團(tuán)制造生產(chǎn)的PM6681ATR穩(wěn)壓器 - 線性 + 開關(guān)此產(chǎn)品族中的產(chǎn)品用于構(gòu)建執(zhí)行 DC-DC 轉(zhuǎn)換或電壓調(diào)節(jié)功能的電路，采用的是開關(guān)模式和線性穩(wěn)壓器功能的組合。雖然具體的拓?fù)涓鞑幌嗤祟惍a(chǎn)品的主要目的是將開關(guān)模式技術(shù)的效率優(yōu)勢(shì)與線性穩(wěn)壓技術(shù)的低噪聲特性結(jié)合在一起。