Linear LTM4616 8A两相电源方案

Linear 公司的LTM4616是双路2相开关模式DC/DC功率稳压器系统,每路可提供8A的电流或单路提供16A电流. LTM4616集成了开关控制器,功率FET,电感和所有支持的元件.输入电压从2.375V到5.5V,输出电压范围从0.6V到5V,电压的设定由外接单一电阻确定.可广泛应用在通信,网络和工业设备,存储和ATCA, PCI Express卡以及以电池为能源的设备.本文介绍了LTM4616的主要性能, 典型应用电路和方框图以及多种不同组合的应用电路图.

The LTM 4616 is a complete dual 2-phase 8A per channel switch mode DC/DC power regulator system in a 15mm x15mm surface mount LGA package. Included in the package are the switching controller, power FETs, inductor and all support components. Operating from an input voltage range of 2.375V to 5.5V, the LTM4616 supports two outputs within a voltage range of 0.6V to 5V, each set by a single external resistor. This high efficiency design delivers up to 8A continuous current (10A peak) for each output. Only bulk input and output capacitors are needed, depending on ripple requirement. The part can also be configured for a two phase single output at up to 16A.The low profile package (2.82mm) enables utilizationof unused space on the back side of PC boards for high density point-of-load regulation.
Fault protection features include overvoltage protection, overcurrent protection and thermal shutdown. The power module is offered in a space saving and thermally enhanced 15mm × 15mm × 2.82mm LGA package. The LTM4616 is Pb-free and RoHS compliant.

主要特性:
■Complete Dual DC/DC Regulator System
■Input Voltage Range: 2.375V to 5.5V
■Dual 8A Outputs, or Single 16A Output with a 0.6V to 5V Range
■Output Voltage Tracking and Margining
■±1.75% Total DC Output Error (–40°C to 125°C)
■Current Mode Control/Fast Transient Response
■Power Good Tracking and Margining
■Overcurrent/Thermal Shutdown Protection
■Onboard Frequency Synchronization
■Spread Spectrum Frequency Modulation
■Multiphase Operation
■Selectable Burst Mode  Operation
■Output Overvoltage Protection
■Gold-Pad Finish Allows Soldering with Pb and Pb-Free Solder Paste
■Small Surface Mount Footprint, Low Profile (15mm × 15mm × 2.82mm) LGA Package

应用:
■Telecom, Networking and Industrial Equipment
■Storage and ATCA, PCI Express Cards
■Battery Operated Equipment



图1. LTM4616典型应用电路



图2.LTM4616简化的功能框图



图3.带跟踪的双输出(3.3V和1.5V)电路图



图4. 3.2V-5V输入,1.8V和1.5V输出的应用电路图



图5.两输出并联,1.5V/16A输出应用电路图



图6.LTM4616输出先后顺序的应用电路图



图7.四相并联,输出1.2V/32A应用电路图



图8.带跟踪的4相4输出(3.3V,2.5V,1.8V和1.5V)的电路图