Micrel MIC2605 40V PWM升压稳压电源方案

Micrel 公司的MIC2605/6是 1.2MHz/2MHz PWM DC/DC升压开关稳压电源,输出电压从4.5V 到 20V,输出电压可高达40V,内部集成了40V/0.5A的开关和肖特基二极管,具有可编程的软起动,关断电流小于10uA.可用于TV调谐器,宽带通信,TFT-LCD偏压电源,SEPIC转换器,以及局部升压稳压器.本文介绍了MIC2605/6的主要特性,方框图以及应用电路,评估板电路图和材料清单(BOM).

The MIC2605/6 is a 1.2MHz/2MHz, PWM DC/DC boost switching regulator available in a 2mm x 2mm MLF® package. High power density is achieved with the MIC2605/6’s internal 40V/0.5A switch and schottky diode, allowing it to power large loads in a tiny footprint.
The MIC2605/6 implements constant frequency 1.2MHz/2MHz PWM current mode control. The MIC2605/6 offers internal compensation that offers excellent transient response and output regulation performance. The high frequency operation saves board space by allowing small, low-profile external components. The fixed frequency PWM scheme also reduces spurious switching noise and ripple to the input power source.
The MIC2605/6 is available in an 8-pin 2mm x 2mm MLF® leadless package. This package has an output overvoltage protection feature.
The MIC2605/6 has an operating junction temperature range of –40°C to +125°C.
MIC2605主要特性:
Wide input voltage range: 4.5V to 20V
Output voltage adjustable to 40V
0.5A switch current and schottky diode
MIC2605 operates at 1.2MHz
MIC2606 operates at 2MHz
Programmable soft start
Stable with small size ceramic capacitors
High efficiency
Low input and output ripple
<10μA shutdown current
UVLO
Output over-voltage and over-temperature protection
8-pin 2mm x 2mm MLF&reg; package
–40°C to +125°C junction temperature range
MIC2605应用:
TV-tuners
Broadband communications
TFT-LCD bias supplies
Bias supply
Positive output regulators
SEPIC converters
DSL applications
Local boost regulators



图1.MIC2605/6方框图



图2.MIC2605/6典型应用电路图



图3.MIC2605/6 评估板电路图
评估板材料清单(BOM):