LM5067MM-1/NOPB

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The LM5067MM-1/NOPB is a hot swap controller designed by Texas Instruments. This device is specifically designed to allow a logic circuit to control a system that has power rail voltage source that is much higher than the logic operating voltage. The LM5067 can safely ramp the turn-on voltage, prevent inrush current, and limit fault currents thus protecting downstream systems from dangerous overvoltage events.

The main application field of the LM5067MM-1/NOPB hot swap controller is powering up of microprocessor designs. It provides wide regulation range suitable for driving low-voltage CPUs and a low RDS(on)MOSFET for peak currents during warm boot cycles. Compared to manual hot swap solutions, it simplifies system design, lowers parts count, and adds the advantage of allowing microprocessor operation from the initial application of power. In addition, the integrated circuit provides temperature compensation, input power sequencing, and selectable slew rates for controlling in-rush currents in the event of cold reboot or initial power-up of the unit.

The LM5067MM-1/NOPB is based on the Constant Voltage Constant Current (CVCC) concept, so it has built-in current limit in the 3.3V to 24V input voltage range. Thus, the current limit is set at a fixed level and thus, the power supply design is simplified and cost-effectiveness is improved. The integrated circuit also comes with an adjustable threshold voltage to help limit the inrush current. This feature allows the user to select the minimum voltage that the output voltage should reach before it is allowed to ramp up to the nominal value. The components such as logic threshold and power supply shutdown are also monitored and programmable.

Internally, the LM5067MM-1/NOPB uses an inherently safe topology, allowing the device to operate from input voltages that are much higher than the device\'s output voltage. The device includes an overvoltage protection (OVP) circuit with programmable trip point, as well as a reverse current protection circuit that prevents current from flowing back into the power rails. The high-side driver can also be configured for either current control or voltage regulation depending on the user\'s application requirements.

The primary components of the LM5067MM-1/NOPB are the control logic, power MOSFET, current sense circuit and delay circuit. The controller block is the heart of the device and is responsible for setting the turn-on and turn-off thresholds and controlling the power MOSFET which drives the output voltage. The current sense circuit is used to limit the output current, and the delay circuit is used to slow down the turn-on rate of the MOSFET to prevent inrush current. The inputs of the LM5067MM-1/NOPB hot swap controller consist of the power supply input, the reference input, the enable input, and the fault detect input.

Overall, the LM5067MM-1/NOPB from Texas Instruments is an innovative hot swappable controller which utilizes CVCC topology and provides a constant voltage and constant current output in the 3.3V to 24V input voltage range. The device offers user-adjustable features such as an adjustable turn-on threshold and selectable current limit, making it suitable for complex systems with longer power up sequences and high-power-up currents.

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