描述 Description

MIC28304 is synchronous step-down regulator module, featuring a unique adaptive ON-time control architecture. The module incorporates a DC-to-DC controller, power MOSFETs, bootstrap diode, bootstrap capacitor and an inductor in a single package. The MIC28304 operates over an input supply range from 4.5V to 70V and can be used to supply up to 3A of output current. The output voltage is adjustable down to 0.8V with a guaranteed accuracy of ±1%. The device operates with programmable switching frequency from 200kHz to 600kHz.HyperLight Load? architecture provides the same high-efficiency and ultra-fast transient response as the Hyper Speed Control? architecture under the medium to heavy loads, but also maintains high efficiency under light load conditions by transitioning to variable frequency, discontinuous-mode operation.The MIC28304 offers a full suite of protection features to ensure protection of the IC during fault conditions. These include under-voltage lockout to ensure proper operation under power-sag conditions, internal soft-start to reduce inrush current, foldback current limit, “hiccup” mode short-circuit protection and thermal shutdown.

特性 Features

? Stable with low-ESR ceramic output capacitor
? No compensation and no inductor to choose
? 4.5V to 70V input voltage
? HyperLight Load??Control (MIC28304-1)
? Hyper Speed Control? (MIC28304-2)
? Single-supply operation
? Power Good (PG) output
? Hiccup mode current limit
? Low radiated emission (EMI) per EN55022, class B
? 5ms internal soft-start, internal compensation, and thermal shutdown
? Adjustable current limit
? 0.8V Reference voltage with ±1% accuracy
? Adjustable output voltage from 0.8V to 24V (also limited by duty cycle)
? 200kHz to 600kHz, programmable switching frequency
? Supports safe start-up into a pre-biased output
? –40°C to +125°C junction temperature range
? Available in 64-pin, 12mm × 12mm × 3.5mm QFN package

簡(jiǎn)介

MIC28304屬于開發(fā)板套件編程器的評(píng)估板-DC/DC與AC/DC（離線）SMPS。由制造生產(chǎn)的MIC28304評(píng)估板 - DC/DC 與 AC/DC（離線）SMPS該系列產(chǎn)品提供了一種方便的方法，可對(duì)開關(guān)模式電源轉(zhuǎn)換所用的器件（包括 DC-DC 和 AC-DC 型）進(jìn)行性能或特性評(píng)估?！胺€(wěn)壓器”（包含內(nèi)部電源開關(guān)裝置）和“控制器”（設(shè)計(jì)為控制外部電源開關(guān)）之類的器件均包括在內(nèi)。