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Linear LTC3880雙輸出多相降壓電源解決方案

2011-01-27

Linear公司的LTC3880/LTC3880-1是雙輸出多相DC/DC同步降壓開關(guān)電源控制器,集成了基于I2C的PMBus兼容的串行接口,采用恒定頻率電流模式架構(gòu).VIN輸出電壓從4.5V到24V,輸出電壓VOUT從0.5V到5.5V,輸出電壓對溫度的變化為±0.5%.器件集成了15位ADC,主要用在大電流分布電源系統(tǒng),通信,數(shù)據(jù)通信和存儲(chǔ)器系統(tǒng)以及智能能效的電源系統(tǒng).本文介紹了LTC3880/LTC3880-1主要特性,方框圖, 三相工作負(fù)載共享連接圖, 電感DCR和電阻電流檢測電路圖,以及多種應(yīng)用電路圖.

Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management

The LTC3880/LTC3880-1 are dual, PolyPhase DC/DC synchronous step-down switching regulator controllers with an I2C-based PMBus compliant serial interface. The controllers use a constant frequency, current mode architecture.

Switching frequency, output voltage, and device address can be programmed using external configuration resistors.

Additionally, parameters can be set via the digital interface or stored in EEPROM. Voltage, current, internal/external temperature and fault status can be read back through the bus interface.

The LTC3880/LTC3880-1 can be configured for Burst Mode operation, discontinuous (pulse-skipping) mode or continuous inductor current mode. The LTC3880 incorporates a 5V linear regulator while the LTC3880-1 uses an external 5V supply for minimum power loss. 

The LTC3880/LTC3880-1 are available in a 40-pin 6mmx 6mm QFN package.

LTC3880/LTC3880-1主要特性:

PMBus/I2C Compliant Serial Interface

– Query Voltage, Currents, Temperature and Faults

– Programmable Voltage, Current Limit, Digital Soft-Start/Stop, Sequencing, Margining, OV/UV and Frequency Synchronization (250kHz to 1MHz)

±0.5% Output Voltage Accuracy over Temperature

Integrated 15-Bit ADC

Optional Resistor Programmable Parameters

Internal EEPROM and Fault Logging

Integrated Powerful N-Channel MOSFET Gate Drivers Power Conversion

Wide VIN Range: 4.5V to 24V

VOUT Range: 0.5V to 5.5V

Analog Current Mode Control Loop

Supports Power-Up Into Pre-Biased Load

Accurate PolyPhase Current Sharing for Up to 6 Phases

Available in a 40-Pin (6mmx?6mm) QFN Package

LTC3880/LTC3880-1應(yīng)用:

High Current Distributed Power Systems

Telecom, Datacom and Storage Systems

Intelligent Energy Efficient Power Regulation

圖1.LTC3880/LTC3880-1方框圖

圖2.LTC3880/LTC3880-1三相工作負(fù)載共享連接圖

圖3.LTC3880/LTC3880-1電感DCR電流檢測電路圖
 
圖4.LTC3880/LTC3880-1電阻電流檢測電路圖

圖5.LTC3880/LTC3880-1推薦PCB布局圖

圖6.LTC3880高效雙路500kHz 3.3V/1.8V降壓轉(zhuǎn)換器電路圖

圖7.LTC3880 LTC控制器連接圖

圖8.LTC3880高效雙路425kHz 2.5V/1.8V降壓轉(zhuǎn)換器電路圖


圖9.LTC3880高效雙路帶檢測電阻的500kHz 5V/3.3V降壓轉(zhuǎn)換器電路圖


圖10.LTC3880高效350kHz雙相1.5V降壓轉(zhuǎn)換器電路圖


圖11.LTC3880高效450kHz 1.0V降壓雙相轉(zhuǎn)換器電路圖


圖12.LTC3880高效三相450kHz 2.5V單個(gè)1.8V降壓轉(zhuǎn)換器電路圖


圖13.LTC3880高效四相425kHz 1.0V降壓轉(zhuǎn)換器電路圖
詳情請見:
http://cds.linear.com/docs/Datasheet/3880p.pdf

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