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