本文介紹了MIC2166主要特性，方框圖，應(yīng)用電路以及8V-24V 到1.2V/10A評(píng)估板電路圖和評(píng)估板材料清單（BOM）。

MIC2166是Micrel公司的同步自適應(yīng)降壓電源控制器，工作電壓4.5V到28V，工作頻率600kHz，輸出電流高達(dá)25A，輸出電壓可調(diào)低至0.8V，精度±1%。主要用于STB，網(wǎng)關(guān)，路由器和DSL調(diào)制解調(diào)器，打印機(jī)，掃描儀，圖像和視頻卡，服務(wù)器，PC和處理器核電源以及低壓分布電源。The Micrel MIC2166 is a synchronous adaptive on-time buck controller targeting high performance, cost sensitive applications such as set-top boxes, gateways, routers, computing peripherals, and telecom/networking equipment.

The MIC2166 operates over a supply range of 4.5V to 28V. It has an internal linear regulator which provides a regulated 5V supply to power the internal control circuitry.

MIC2166 operates at a constant 600kHz switching frequency and can be used to drive up to 25A of output current. The output voltage is adjustable down to 0.8V.

A unique Hyper Speed Control? architecture enables ultra-fast transient response while reducing the output capacitance and also makes High VIN/Low VOUT operation possible.A UVLO feature is provided to ensure proper operation under power-sag conditions to prevent the external power MOSFET from over heating. Also, a soft-start feature is provided to reduce the inrush current. Short current sensing on the bottom MOSFET with hiccup mode operation ensures protection in case of an output short circuit. Further, the MIC2166 includes an EN pin to shut down the converter and a PGOOD pin to allow simple sequencing.

The MIC2166 is available in a 10 pin MSOP ePad package with a junction operating termperature range from –40℃ to +125℃. All support documentation can be found on
Micrel’s web site at: www.micrel.com.

MIC2166主要特性：

? Hyper Speed Control? architecture enables

- High delta V operation (VIN=28V and VOUT=0.8V)

- Smallest output capacitance

? Built-in 5V regulator for single-supply operation

? Any CapacitorTM stable

- Zero ESR to high ESR

? Power-Good output

? Input voltage range: 4.5V to 28V

? 5μA typical shutdown current

? 25A output current drive capability

? Output down to +0.8V with ±1% accuracy

? 600kHz switching frequency

? Internal 5ms digital soft-start

? Thermal shutdown and hiccup current limit protection

? No external current-sense resistor required

? Pre-bias output safe

? 10-pin MSOP ePad package

? –40℃ to +125℃ junction temperature range

MIC2166應(yīng)用：

? Set-top box, gateways, routers and DSL modems

? Printers, scanners, graphic and video cards

? Servers, PCs and processor core supply

? Low-Voltage Distributed Power

圖1。MIC2166方框圖

圖2。MIC2166可調(diào)輸出600kHz降壓轉(zhuǎn)換器

圖3。MIC2166 8V-24V 到1.2V/10A評(píng)估板電路圖

評(píng)估板材料清單（BOM）：