基于MIC2826设计的四输出可编电源管理方案

MIC2826是四输出可编程电源管理集成电路(PMIC),最适合用作移动应用处理器,协处理器,DSP,GPS和媒体播放器芯片组的高效电源. MIC2826集成了一个4MHz 500mA PWM/PFM同步降压稳压器和三个LDO稳压器(每个输出150mA)以及提供用于编程的400kHz I2C接口.本文介绍了MIC2826主要特性,方框图,以及在GPS子系统的应用电路, MIC2826 评估板电路图和材料清单(BOM).

The Micrel MIC2826 is a four output, programmable Power Management IC, optimized for high efficiency power support in Mobile Application Processors, Co-Processors, DSPs, GPS and Media Player chipsets. The device integrates a single 500mA PWM/PFM synchronous buck (step-down) regulator with three Low Dropout Regulators and a 400kHz I²C interface that provides programmable Dynamic Voltage Scaling (DVS), Power Sequencing, and individual output Enable/Disable controls allowing the user to optimally control all four outputs.

The 4MHz synchronous buck regulator features a patented HyperLight Load™ (HLL) architecture which minimizes switching losses and provides low quiescent current operation for high efficiency at light loads. Additional benefits of this proprietary architecture are low output ripple voltage and fast transient response throughout the entire load range with the use of small output capacitors, reducing the overall system size.

Three high performance LDOs are integrated into the MIC2826 to provide additional system voltages for I/O, memory and other analog functions. Each LDO is ca大电流电感pable of sourcing 150mA output current with high PSRR and low output noise. A 2% output voltage accuracy, low dropout voltage (150mV @ 150mA), and low ground current of 116μA (all three LDOs operating) makes this device ideally suited for mobile applications.

The MIC2826 is available in a tiny 14-pin 2.5mm x 2.5mm 塑封电感器Thin MLF® with a junction operating range from -40℃ to +125℃.

MIC2826主要特性:

• Fast-mode I2C control interface

• Tiny 14-pin 2.5mm x 2.5mm MLF® package

• Default start-up voltage states and sequencing

• Fault indication processor flag – IRQb

• -40℃ to 125℃ junction temperature range

• Thermal shutdown and current-limit protection

• Power On After Fault (POAF) function

DC-DC Synchronous Buck

• 2.7V to 5.5V input voltage range

• 500mA continuous output current

• HyperLight Load™ mode

– 25μA quiescent current

• 90% peak efficiency; 85% at 1mA

• Ultra-fast transient response

• Dynamic Voltage Scaling (DVS) range: 0.8V to 1.8V

– 0.8V to 1.2V in 25mV steps

– 1.2V to 1.8V in 50mV steps

• ±2% initial accuracy

• Low output voltage ripple: 20mVpp in HyperLight

Load™ mode, 3mV in full PWM mode

LDOs

• 1.8V to VDVIN input voltage range工字电感

• 150mA output current (each LDO)

• Dynamic Voltage Scaling (each LDO)

– DVS range: 0.8V to 3.3V in 50mV steps

• ±2% initial accuracy

• Low quiescent current – 50μA (each LDO)

• Low dropout voltage – 50mV @ 50mA

• Low output noise - 45μVRMS

• Stable with ceramic output capacitors

• 65dB PSRR at 1kHz

MIC2826应用:

• Application processors

• GPS subsystems

• General purpose PMIC

• Mobile phones / PDAs

• Portable media players

• Mobile television receivers

图1.MIC2826功能线圈电感器方框图

图2.MIC2826在GPS子系统的应用电路

MIC2826 评估板

The MIC2826 evaluation kit includes:

• MIC2826 Evaluation Board

• CD-ROM including:

– MIC2826/7 Evaluation Software

– Evaluation User Guide

Third party hardware required:

• USB-to共模电感器-I2C Interface Board (dongle)

• USB Peripheral Cable

图3.MIC2826 评估板外形图

平面变压器厂家 | 平面电感厂家

电源监控芯片TPS3307应用与DSP图像处理系统电源在所设计系统的设备中可以说是最简单的器件，但却必须放在整机设计的最后考虑。为了保证整机的可靠运转，对供电系统的要求越来越高。在高速电路板中，例如视频处理卡，由于电路的高频特性，开关的电磁辐射和线路

为什么谐振电流三元件谐振会出现在上升沿，各位大，一般不都在峰值之后么，求教。






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2017-8-23 08:22 上

[DCDC]电压隔离模块请问一下这个电压隔离模块的作用是什么?..即这个电压隔离是什么意思。 比如电压隔离模块B0505，输入是5V电压，输出也是5V电压。 请问这个输入5V与输出5V的地能否接在一起？。 接在一起会咋样，不接在一起又会如何？2个地接了还叫什么隔离啊电压隔离 输入和输出的电压是隔离的 中间用变压器隔开的。 西安伟京电子制造有限公司于2004年

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