LTM4654

推荐用于新设计

55V, 300W Source/Sink Hybrid Step-Down Non-Isolated μModule Bus Converter

产品技术资料帮助

ADI公司所提供的资料均视为准确、可靠。但本公司不为用户在应用过程中侵犯任何专利权或第三方权利承担任何责任。技术指标的修改不再另行通知。本公司既没有含蓄的允许,也不允许借用ADI公司的专利或专利权的名义。本文出现的商标和注册商标所有权分别属于相应的公司。

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概述

  • Input voltage range: 20V to 55V (57V abs. max.)
  • Wide output voltage range: 4.5V to 18V (VOUT < VIN/2);
  • 96.7% efficiency (9V at ±15A output, 48VIN)
  • ±3% maximum total DC output error
  • Up to 300W output power (source/sink)
  • Scalable for higher power applications
  • Fixed-frequency current mode control
  • Phase-lockable external synchronization from 200kHz to 1MHz;
  • Low startup inrush current with voltage-balancing of CFLY and CMID before the DC-to-DC switching action
  • Output voltage tracking with soft start
  • Short-circuit protection with adjustable retry-timer
  • Overcurrent and overtemperature protection
  • Onboard diode temperature monitor
  • Optional external reference input
  • Power good and FAULT output indicators
  • 120-Lead, 16mm × 16mm × 8.96mm, BGA package

The LTM4654 is a complete 300W output source/sink switching mode hybrid-topology step-down DC-to-DC power μModule® (micromodule) bus converter. The LTM4654’s exposed power inductor resides on the top of the package, providing an intrinsic path for the heat to dissipate up-and-out of the power module—away from the printed circuit board (PCB). The package includes the switching controller IC, the power MOSFETs, and the supporting components. Only flying (charge-pump) capacitors, bulk input and output bypass capacitors, and a few passive components for configurations are needed.

The LTM4654 features bidirectional operation, frequency synchronization, Burst Mode® operation, output voltage soft start, and tracking. An onboard temperature diode is available for temperature monitoring. The LTM4654 is designed for scalability. In higher power applications, multiple LTM4654 power modules can be paralleled.

The LTM4654 protects against short-circuit, overcurrent (OC), and overtemperature (OT) faults. The LTM4654 is offered in a BGA package with a RoHS-compliant terminal finish.

APPLICATIONS

  • Non-isolated intermediate bus power architectures
  • Telecom, networking, test, and measurement equipment
  • Industrial applications

LTM4654
55V, 300W Source/Sink Hybrid Step-Down Non-Isolated μModule Bus Converter
LTM4654 Typical Application Circuit LTM4654 Typical Application Graph LTM4654 Block Diagram LTM4654 Pin Configuration LTM4654 Chip Illustration
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评估套件

eval board
EVAL-LTM4654-AZ

LTM4654:55V、300W 源/漏混合降压非隔离式微模块总线转换器

特性和优点

  • 全温度范围内的输出电压精度为 ±3%
  • 多相操作的时钟输出
  • 电源正常输出信号
  • 短路保护
  • 单调输出电压启动
  • 可选外部参考
  • 欠压锁定 (UVLO)
  • 内部电荷平衡电路

产品详情

EVAL-LTM4654-AZ 评估板采用 LTM®4654,这是一款高效、高功率密度、双向混合功率 μ模块® (微型模块)转换器。EVAL-LTM4654-AZ 可提供 12V/25A,输入电压范围为 36V 至 55V(瞬态期间最高可达 57V)。

LTM4654 采用了一种将开关电容 (SC) 拓扑中的软开关与传统降压转换器相结合的架构,与传统的开关架构相比,可提供更高的效率。LTM4654 为配电、数据中心和电信应用的非隔离中间总线应用提供了一种高效、高密度且经济的解决方案。

LTM4654 的电流模式控制架构可以并联多个 LTM4654 模块,以多相配置运行,具有出色的电流共享和低输出电压纹波,从而实现更高功率的应用。’采用软开关前端可以实现低电磁干扰 (EMI) 辐射和降低金属氧化物半导体场效应晶体管 (MOSFET) 应力。

LTM4654 设计通过在启动时预先平衡电容器,消除了 SC 电路通常伴随的浪涌电流。

LTM4654 监测系统电压、电流和温度故障。在发生故障情况时,该器件会停止开关并将 FAULT 引脚拉低。内置定时器会设置合适的重启或重试时间。

LTM4654 数据手册必须与本评估板用户指南配合使用。

EVAL-LTM4654-AZ
LTM4654:55V、300W 源/漏混合降压非隔离式微模块总线转换器
EVAL-LTM4654-AZ Board Photo Angle View EVAL-LTM4654-AZ Board Photo Bottom View EVAL-LTM4654-AZ Board Photo Top View

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