Linear公司的LTC3880/LTC3880-1是雙輸出多相DC/DC同步降壓開關電源控制器,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.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,通信,數據通信和存儲器系統以及智能能效的電源系統.本文介紹了LTC3880/LTC3880-1主要特性,方框圖, 三相工作負載共享連接圖, 電感DCR和電阻電流檢測電路圖,以及多種應用電路圖.
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降壓轉換器電路圖
圖10.LTC3880高效350kHz雙相1.5V降壓轉換器電路圖
圖11.LTC3880高效450kHz 1.0V降壓雙相轉換器電路圖
圖12.LTC3880高效三相450kHz 2.5V單個1.8V降壓轉換器電路圖
圖13.LTC3880高效四相425kHz 1.0V降壓轉換器電路圖
詳情請見:
http://cds.linear.com/docs/Datasheet/3880p.pdf
