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38V, 10A Rugged Step-Down DC/DC µModule Regulator with Fail Safe Load Protection

The LTM4641 is a 4.5V to 38V input, 0.6V to 6V output, 10A step-down µModule regulator with comprehensive electrical and thermal protection for loads such as processors, ASICs and high-end FPGAs.

This device monitors input voltage, output voltage and temperature conditions and is specifically designed for point-of-load regulation in robotics and industrial instrumentation, as well as rugged environments such as defence and avionics systems.

See video at: http://video.linear.com/142

In conjunction with Arrow Electronics.

The LTM4641 from Linear Technology is a switch mode step-down DC/DC µModule regulator with advanced input and load protection features that monitors input voltage, output voltage and temperature conditions. If any user-adjustable trip thresholds are exceeded, the LTM4641 responds quickly within 500ns in the case of an output overvoltage fault, ceasing operation, and if necessary, activating external switches. One switch disconnects the input supply rail while the other discharges the output capacitors to protect the load.

Additionally, when any trip threshold is exceeded, the LTM4641 will issue a logic level fault signal which may be used to initiate an orderly emergency shutdown sequence in the system. The adjustable trip thresholds are accurate to within ±2.7% over the full operating temperature range.

The LTM4641's high efficiency design can deliver up to 10A continuous current with a few input and output capacitors. The regulator's constant on-time current mode control architecture enables high step-down ratios and fast response to transient line and load changes.

As a µModule regulator, the LTM4641 includes power MOSFETs, DC/DC controller, inductor, compensation and the protection logic circuits in a compact surface mount BGA package. The LTM4641 is designed for point-of-load regulation in robotics and industrial instrumentation, as well as rugged environments such as defence and avionics systems.

Trip detection thresholds for the following faults are customizable: input undervoltage, overtemperature, input overvoltage and output overvoltage. When any trip threshold is exceeded, the LTM4641's protection circuitry classifies the fault in one of two categories, latching or non-latching. Normal voltage regulation will automatically resume once a non-latching fault such as input undervoltage, bias input undervoltage or input overvoltage has cleared.

For latching faults such as an output overvoltage or a second input overvoltage threshold, the system must cycle the input power or supply a logic level signal to the LTM4641 in order to resume normal operation. An overtemperature fault can be classified by the user as a latching or non-latching fault by setting a logic level pin. The LTM4641 can be configured to autonomously restart after latchoff fault conditions have cleared.

The output voltage is user adjustable from 0.6V to 6V with ±1.5% total accuracy over line, load and temperature. Additional features include output current sharing for loads requiring more than 10A, externally adjustable soft start, output overcurrent protection, switching frequency and output voltage tracking.

The LTM4641 is packaged a thermally efficient 15mm x 15mm x 5.01mm RoHS compliant BGA with guaranteed operation over the -40°C to +125°C (E grade and I grade) or -55°C to +125°C (MP grade) internal temperature range. Pricing starts at $25.95 each for 1,000-piece quantities.

For more information, visit www.linear.com/product/LTM4641.

See LTM4641 video at: http://video.linear.com/142

Author
Linear Technology (UK) Limited

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