Linear LTC3815 6A DC降压电源解决方案

Linear公司的LTC3815是具有数字电源系统管理的6A单片高效同步DC/DC降压转换器,采用锁相控制即时电流模式架构,集成了13位ADC,输入电压2.25V - 5.5V,输出电压从0.4V到72% VIN,主要用在智能效率电源转换,ASIC/FPGA/处理器电源,分布式电源系统和点负载电源转换.本文介绍了LTC3815主要特性,框图,多种应用电路以及评估板DC2065A主要特性,电路图和材料清单.
The LTC?3815 is a high efficiency, 6A monolithic synchronousbuck regulator using a phase lockable controlledon-time, current mode architecture. The output voltageis programmable from 0.4V to 72% of VIN with a singleexternal resistor or an external voltage reference throughthe reference input (REF) pin. The output voltage can bemargined up or down up to ±25% with 0.1% resolutionvia a PMBus-compliant serial interface. The serial interfacecan also be used to read back fault status and bothtime-averaged (~4ms) and peak input/output current,input/output voltage and temperature. System configurationand monitoring is supported by the LTpowerPlay™development system.
The architecture provides extremely fast transient responseand allows operation at the very low on-times required toregulate low output voltages at high switching frequencies.
The operating frequency is programmable from 400kHzto 3MHz with an external resistor or for noise sensitiveapplications, it can be synchronized to an external clockover the same range. The operating supply voltage rangeis from 2.25V to 5.5V making it suitable for operation from2.5V, 3.3V or 5V rails or Lithium-Ion batteries.
LTC3815主要特性:
2.25V to 5.5V Input Voltage Range
±1% Total Output Voltage Accuracy OverTemperature at VIN = 3.3V or 5V
Single Resistor-Programmable Output Voltage
PMBus Compliant Serial Interface:
Programmable Output Voltage Margining:Up to ±25% VOUT Range with 0.1% Resolution
Read back of Average and Peak Temperature,Current, and Voltage (25Hz Refresh Rate)
Fault Status
Phase-Lockable Fixed Frequency Up to 3MHz
Less Than 1ms Power-Up...