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03-07-2017

Isolated Anyside Switch Controller Protects & Monitors Up to 1000VDC Power Supplies

Linear Technology » LTM9100

Linear Technology Corporation introduces the LTM9100 μModule® (micromodule), all-in-one Isolated Anyside™ switch controller protects and monitors high voltage DC power supplies up to 1000 V. High voltage supplies used in industrial, datacom, avionic and medical applications require a controlled turn-on, with isolation needed for control circuit protection, operator safety and breaking ground paths. Alternative relay-based or discrete solutions are bulky, complex, component-intensive and lack safety certifications. The innovative LTM9100 saves design time, certification effort and board area by wrapping all the needed functionality, including isolated power and digital telemetry, in a compact BGA package.

Linear Technology - LTM9100

A 5 kVRMS galvanic isolation barrier inside the LTM9100 separates the digital interface from the switch controller, driving an external N-channel MOSFET or IGBT switch. To guarantee a robust isolation barrier, the controller is production-tested to 6 kVRMS and will be recognized by the component-level UL 1577 standard, saving months of certification time for the end equipment manufacturer. Isolated digital measurements of load current, bus voltage and temperature are accessed via the I2C/SMBus interface, enabling power and energy monitoring of the high voltage bus.

Isolated High Side Load Switch Driver
Isolated High Side Load Switch Driver.

Due to its isolated nature, the LTM9100 is easily configured for high side, low side (ground return) and floating applications. Inrush current is minimized by soft-starting the load, and the supply is protected from overload and short-circuits with a current-limited circuit breaker. The LTM9100 is versatile enough to control inrush current in hot-swappable cards, AC transformers, motor drives and inductive loads. Adjustable undervoltage and overvoltage lockout thresholds ensure that the load operates only when the input supply is in its valid range. A fully integrated DC/DC converter, including the transformer, powers the isolated switch control side.

270 V Load Soft-Start
270 V Load Soft-Start.

Specified over the −40 °C to 105 °C temperature range, the LTM9100 is offered in a 22 mm × 9 mm × 5.16 mm BGA package, with 14.6 mm of creepage distance between the logic side and the isolated side. 1,000-piece pricing starts at $19.45 each. Device samples and evaluation circuit boards are available online or from your local Linear Technology sales office.

Summary of Features: LTM9100

  • Controls N-Channel MOSFET or IGBT Switch
  • Galvanically Isolated Switch Control
    • 5 kVRMS for 1 Minute (UL 1577 Recognition Pending)
    • 690 VRMS (1000 VDC) Continuous Working Voltage
    • > 30 kV/μs Common Mode Transient Immunity
    • ±20 kV HBM ESD Across Barrier
  • 10-Bit ADC Measures Load Current & Two Voltage Inputs
  • I2C/SMBus Interface for Configuration & Data Readback
  • Adjustable Soft-Start Rate & Circuit Breaker Threshold
  • Internal Isolated DC/DC Power Supply
  • Undervoltage & Overvoltage Lockout
  • Independent 3 V to 5.5 V Logic Supply
  • Low < 10 μA Shutdown Mode
  • Fault Alert & Power Good Outputs
  • 22 mm × 9 mm × 5.16 mm BGA Package with 14.6 mm Creepage
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