What this -48V hot swap controller does — and why the -2 matters
The Texas Instruments LM5067MM-2/NOPB is a single-channel hot swap controller designed for -48V telecom and datacom backplane applications. It manages inrush current and protects against overcurrent and overvoltage faults when a line card is plugged into a live backplane. The -2 suffix denotes the auto-retry variant: after a fault timeout, the controller automatically attempts to restart, rather than latching off until a manual reset or power cycle. This makes it the preferred choice for remote or unattended equipment where a manual reset is impractical.
Supply range and protection programmability
The LM5067MM-2/NOPB operates from a -80V to -9V supply, giving it headroom on standard -48V rails to survive transients and ring-trip events common in telecom central-office environments. The controller integrates programmable undervoltage lockout (UVLO), overvoltage protection (OVP), current limit, circuit breaker, and fault timeout — all set with external resistors and a capacitor. No internal power switch is included; an external N-channel MOSFET handles the pass element, so the designer sizes the FET for the load current and thermal budget.
Temperature grade and deployment environment
Rated for -40°C to 125°C operating temperature, this controller suits outdoor telecom cabinets, base stations, and industrial equipment where ambient temperatures swing widely. The 10-VSSOP package is a compact surface-mount footprint (3.00 mm width, 0.118" pitch), appropriate for dense line-card layouts.
Lifecycle and supply posture
Texas Instruments lists the LM5067MM-2/NOPB as Active and ROHS3 compliant.