Linear 公司的LTM4613是完整的超低噪音8A开关模式DC/DC电源,封装内包括开关控制器,功率FET,电感和所有的支持元件.输入电压范围从5V到36V,输出电压3.3V-15V,由单个外接电阻设定,输出电流8A,可并行输出.主要用在通信和网络设备,工业和航空电子,RF系统.本文介绍了LTM4613主要特性,方框图,多种应用电路以及演示板电路图和材料清单.

The LTM4613 is a complete, ultralow noise, 8A switch mode DC/DC power supply. Included in the package are the switching controller, power FETs, inductor and all support components. Operating over an input voltage range of 5V to 36V, the LTM4613 supports an output voltage range of 3.3V to 15V, set by a single external resistor. Only bulk input and output capacitors are needed to finish the design.

High switching frequency and an adaptive on-time current mode architecture enables a very fast transient response to line and load changes without sacrificing stability.

The onboard input filter and noise cancellation circuits achieve low noise coupling, thus effectively reducing the electromagnetic interference (EMI).

Furthermore, the DC/DC μModule. regulator can be synchronized with an external clock to reduce undesirable frequency harmonics and allow PolyPhase. operation for high load currents.

The LTM4613 is offered in a space saving and thermally enhanced 15mm x15mm x4.32mm LGA package, which enables utilization of unused space on the bottom of PC boards for high density point-of-load regulation. The LTM4613 is Pb-free and RoHS compliant.

LTM4613主要特性：

Complete Low EMI Switch Mode Power Supply

EN55022 Class B Compliant

Wide Input Voltage Range: 5V to 36V

8A Output Current

3.3V to 15V Output Voltage Range

Low Input and Output Referred Noise

Output Voltage Tracking and Margining

PLL Frequency Synchronization

2% Maximum Total DC Error

Power Good Tracks with Margining

Current Foldback Protection

Parallel/Current Sharing

Ultrafast Transient Response

Current Mode Control

Programmable Soft-Start

Output Overvoltage Protection

–55℃ to 125℃ Operating Temperature Range (LTM4613MPV)

Small Surface Mount Footprint, Low Profile (15mmx15mmx4.32mm) LGA Package

LTM4613应用：

Telecom and Networking Equipment

Industrial and Avionic Equipment

RF Systems

图1.LTM4613简化方框图

图2.LTM4613应用电路图:22V-36VIN,12V/8A设计

图3.LTM4613应用电路图:5V-36VIN,3.3V/8A设计,400kHz频率

图4.LTM4613应用电路图:26V-36VIN,15V/5A设计,600kHz频率

图5.LTM4613应用电路图:两相并行12V/16A设计,600kHz频率

图6.LTM4613应用电路图:两相并行12V/16A设计,600kHz频率

图7.LTM4613应用电路图:两相,5V和3.3V/8A设计,500kHz频率,输出电压跟踪

演示板DC1743A

Demonstration circuit DC1743A features the LTM®4613EV, an EN55022 class B certified, high input and output voltage, high efficiency, switch mode step-down power μModule® regulator. The input voltage range is from 5V to 36V. The output voltage is jumper programmable from 3.3V to 12V with a rated load current of 8A. Derating is necessary for certain VIN, VOUT, frequency and thermal conditions: please refer to LTM4613 data sheet for derating curves.

Only input and output capacitors are needed externally. The DC1743A offers the TRACK/SS pin allowing the user to program output tracking or soft-start period. Output voltage margining can also be realized through jumper position selections.

Higher efficiency at low load currents is achieved by setting the MODE pin jumper to DCM. The PLL pin is available to synchronize the LTM4613EV to an external clock. The LTM4613 data sheet must be read in conjunction with this demo manual prior to working on or modifying demo circuit DC1743A.

图8.演示板DC1743A外形图


图9.演示板DC1743A电路图
演示板DC1743A材料清单(B)M):

详情请见:
http://cds.linear.com/docs/Datasheet/4613f.pdf
和
http://cds.linear.com/docs/Demo%20Board%20Manual/dc1743af.pdf