Linear LTM8025 3AμModule DC-DC转换方案

Linear 公司的LTM 8025是36VIN 3A 降压μModule DC-DC转换器,集成了开关控制器,电源开关,电感和所有的支持元件,工作电压3.6V到36V,输出电流高达3A,输出电压从0.8V到24V,开关频率从200kHz到2.4MHz,外接元件仅为输入和输出电容. LTM 8025主要用在汽车电子电池调节,手提设备电源,分布电源调整,工业用电源等.本文介绍了LTM 8025的主要特性,方框图以及典型应用电路,包括1.8V, 2.5V, 3.3V, 8V和-5V降压转换器电路与采用两个并联LTM 8025达到2.5V 5.5A的降压转换器电路图.

The LTM8025 is a 36VIN, 3A step down μModule converter.

Included in the package are the switching controller, power switches, inductor and all support components. Operating over an input voltage range of 3.6V to 36V, the LTM8025 supports an output voltage range of 0.8V to 24V and a switching frequency range of 200kHz to 2.4MHz, each set by a single resistor. Only the bulk input and output filter capacitors are needed to finish the design.

The low profile package (4.32mm) enables utilization of unused space on the bottom of PC boards for high density point of load regulation.

The LTM8025 is packaged in a thermally enhanced, compact (15mm 9mm) and low profile (4.32mm) over-molded land grid array (LGA) package suitable for automated assembly by standard surface mount equipment. The LTM8025 is RoHS compliant.

LTM 8025主要特性:

Complete Step-Down Switch Mode Power Supply

Wide Input Voltage Range: 3.6V to 36V

Up to 3A Output Current

Parallelable for Increased Output Current

0.8V to 24V Output Voltage

Selectable Switching Frequency: 200kHz to 2.4MHz

Current Mode Control

(e4) RoHS Compliant Package with Gold Pad Finish

Programmable Soft-Start

Tiny, Low Profile (15mmx 9mmx4.32mm) Surface Mount LGA Package

LTM 8025应用:

Automotive Battery Regulation

Power for Portable Products

Distributed Supply Regulation

Industrial Supplies

Wall Transformer Regulation


图1.LTM 8025方框图

典型应用电路

图2.LTM 8025 1.8V降压转换器电路

图3.LTM 8025 2.5V降压转换器电路


图4.LTM 8025 3.3V降压转换器电路


图5.LTM 8025 8V降压转换器电路


图6.LTM 8025 -5V降压转换器电路


图7.两个并联的LTM 8025: 2.5V 5.5A降压转换器电路