LTM4654

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

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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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EVAL-LTM4654-AZ

LTM4654: 55V, 300W Source/Sink Hybrid Step-Down Non-Isolated μModule Bus Converter

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特性和优点

  • ±3% Output Voltage Accuracy Over Temperature
  • Clock Output for a Multiphase Operation
  • Power Good Output Signal
  • Short-Circuit Protection
  • Monotonic Output Voltage Startup
  • Optional External Reference
  • Undervoltage Lockout (UVLO)
  • Internal Charge Balance Circuitry

产品详情

The EVAL-LTM4654-AZ evaluation board features the LTM®4654, a high-efficiency, high-power-density, bi-directional hybrid power μModule® (micromodule) converter. The EVAL-LTM4654-AZ can deliver 12V at 25A with an input voltage range of 36V to 55V (up to 57V during transients).

The LTM4654 uses an architecture that merges soft switching in a Switched capacitor (SC) topology with a traditional step-down converter to provide superior efficiency compared to traditional switching architectures. The LTM4654 offers a high-efficiency, high-density, and cost-effective solution for non-isolated intermediate bus applications for power distribution, datacom centers, and telecom applications.

The LTM4654’s current mode control architecture can parallel multiple LTM4654 modules to operate in a multiphase configuration with excellent current sharing and low output voltage ripple to enable much higher power applications. Low electromagnetic interference (EMI) emissions and reduced Metal-oxide-semiconductor field-effect transistor (MOSFET) stress can be achieved with the soft switching front end.

The LTM4654 design eliminates the inrush current typically associated with SC circuits by pre-balancing the capacitors on startup.

The LTM4654 monitors the system voltage, current, and temperature faults. It stops switching and pulls the FAULT pin low when a fault condition occurs. An onboard timer sets the appropriate restart or retry times.

The LTM4654 data sheet must be used in conjunction with this evaluation board user guide.
EVAL-LTM4654-AZ
LTM4654: 55V, 300W Source/Sink Hybrid Step-Down Non-Isolated μModule Bus Converter
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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