描述 Description

The MIC2206 is a high efficiency 2MHz PWM synchronous buck (step-down) regulator that features a LowQ? LDO standby mode that draws only 18mA of quiescent current. The MIC2206 allows an ultra-low noise, small size, and high efficiency solution for portable power applications.In PWM mode, the MIC2206 operates with a constant frequency 2MHz PWM control. ?Under light load conditions, such as in system sleep or standby modes, the PWM switching operation can be disabled to reduce switching losses. In this light load LowQ? mode, the LDO maintains an output voltage of 1V and draws only 18μAmp of quiescent current. The LDO mode of operation saves battery life while not introducing spurious noise and high ripple as experienced with pulse skipping or bursting mode regulators.The MIC2206 operates from 2.7V to 5.5V input and features internal power MOSFETs that can supply up to 600mA output current in PWM mode. It can operate with a maximum duty cycle of 100% for use in low-dropout conditions.

特性 Features

? 2.7V to 5.5V supply voltage
? 18μA quiescent current
? Low noise, 75μVrms
? 2MHz PWM mode
? >95% efficiency
? 100% maximum duty cycle
? Output Voltage Scaling (1V output in LowQ? Mode)
? Ultra-fast transient response
? Stable with 1mF ceramic output capacitor
? Fully integrated MOSFET switches
? Micropower shutdown
? Thermal shutdown and current limit protection
? -40°C to +125°C junction temperature range

簡介

MIC2206屬于集成電路（IC）的線性穩(wěn)壓器控制器。由制造生產(chǎn)的MIC2206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?，但此類產(chǎn)品的主要目的是將開關(guān)模式技術(shù)的效率優(yōu)勢與線性穩(wěn)壓技術(shù)的低噪聲特性結(jié)合在一起。