描述 Description

The MIC3385 is a high efficiency inductorless buck regulator that features a LowQ? LDO standby mode that draws only 18μA of quiescent current. The MIC3385 requires no external inductor enabling an ultra-low noise, small size, and high efficiency solution for portable power applications.In PWM mode, the MIC3385 operates with a constant frequency 8MHz 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 the output voltage and draws only 18μA 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 MIC3385 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.The MIC3385 is available in the 14-pin 3mm x 3.5mm package with a junction operating range from -40°C to +125°C.

特性 Features

? 2.7 to 5.5V supply voltage
? 18μA quiescent current
? Low noise, 75μVrms
? Output current to 600mA
? >90% efficiency
? 100% maximum duty cycle
? Adjustable output voltage option down to 1V
? Ultra-fast transient response
? No external inductor required
? Enables sub 1mm profile solution
? Fully integrated MOSFET switches
? Micropower shutdown
? Thermal shutdown and current limit protection
? Pb-free 14-pin 3mm x 3.5mm package
? -40°C to +125°C junction temperature range

簡介

MIC3385屬于集成電路（IC）的線性穩(wěn)壓器控制器。由制造生產(chǎn)的MIC3385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。雖然具體的拓撲各不相同，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。