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25A regulator supports N+1 redundancy ensuring power availability under fault conditions

14 March 2018

The LTM4645 is a 25A step-down µModule® (power module) regulator with the ability to current share multiple independent devices (N) where at least one LTM4645 is used as backup (+1) to ensure power availability if one device in this N+1 arrangement detects a fault and must be disconnected. For example, a 75A, 1V load such as an ASIC requires three LTM4645s for 75A (= 3 x 25A) total.

For system resilience, one extra LTM4645 is added as a backup in 3+1 fashion, resulting in four LTM4645s current shared to deliver 75A if one fails. In the event of a faulty operation of one regulator, the device signals an upstream hot swap controller to disconnect itself from the power path while the remaining three LTM4645 regulators maintain uninterrupted operation.

Applications benefiting from the LTM4645’s N+1 redundancy feature include data centers, aerospace, banking transactions and cloud-based systems where improved system safety and integrity are top priority. 

The LTM4645 operates from 4.7V to 15V input supply and regulates an output voltage adjustable from 0.6V to 1.8V. Synchronous step-down operation delivers 25A at 1V from 12VIN with 86% efficiency, 3.5W power loss and 41°C rise (no airflow, no heat sink).  The device is offered in a 9mm x 15mm x 3.51mm BGA package and includes the inductor, MOSFETs and DC/DC regulator IC. With a differential remote sense amplifier to compensate for voltage droop caused by PCB trace resistance and tested electrical parameters from –40°C to 125°C, the output voltage total DC accuracy is guaranteed at ±1.2%.

The LTM4645 has several safety functions such as output overvoltage protection, output overcurrent protection, and an onboard temperature monitoring diode. The propagation delay from time of failure device turn-off is less than 200ns.

The LTM4645 is rated for operation from –40°C to 125°C. Up to 6 devices can current share for 150A of load current. Power loss is only 3.5W for 12V input to 1V output at 25A load. For 12V input, 1V output conversion, full power is delivered up to 75°C (0LFM, no heat sink) and at 85°C derating of load current is 20A. 1,000-piece pricing starts at $26.23.

The USA list pricing shown is for budgetary use only. International prices may differ due to local duties, taxes, fees and exchange rates.

For more information, visit www.linear.com/product/LTM4645.

Summary of Features of the LTM4645:

  • 4.7V to 15V Input Voltage Range
  • 0.6V to 1.8V Output Voltage Range
  • 25A DC Output Current
  • ±1.2% Total DC Output Voltage Error from –40°C to 125°C
  • Supports High Reliability N+1 Phase Redundancy
  • 9mm x 15mm x 3.51mm BGA Package

Typical Application

Applications

  • Telecom, Networking and Industrial Equipment
  • Point of Load Regulation

Analog Devices (UK) Limited
(Formally Linear Technology)
Tel: +44 (0)1628 477066

E-mail: uksales@linear.com

Web site: www.linear.com

Website for product information:  http://www.linear.com/product/LTM4645

Industry Connections: Analog Devices Ltd


 
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