Overview
The LM5067MM-2/NOPB is a negative Hot Swap Controller designed to provide intelligent control of power supply connections during the insertion and removal of circuit cards from a live system backplane or other 'hot' power sources. It is manufactured by Texas Instruments, originally developed by National Semiconductor. The LM5067MM-2/NOPB controls in-rush current to limit system voltage droop and transients, ensuring safe operation within the Safe Operating Area (SOA) of the external series pass N-Channel MOSFET. It also offers circuit protection by monitoring for over-current and over-voltage conditions and provides a Power Good output to indicate when the output voltage is close to the input voltage.
Key Specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments (originally National Semiconductor) |
| Minimum Operating Supply Voltage | -9 V |
| Maximum Operating Supply Voltage | -80 V |
| Maximum Supply Current | 2 mA (Min) |
| Mounting Type | Surface Mount |
| Package Type | 10-Pin MSOP or VSSOP |
| Lead Finish | Tin |
| Number of Channels | 1 |
| External FET | N-Channel |
| PGOOD Output Logic | Active High |
| Typical Circuit Breaker Threshold Voltage | 100 mV |
| Max Processing Temp | 260°C |
Key Features
- Programmable current limit and power dissipation in the external series pass N-Channel MOSFET to ensure operation within the Safe Operating Area (SOA).
- In-rush current limit for safe board insertion into live power sources.
- Circuit protection by monitoring for over-current and over-voltage conditions.
- Power Good output indicates when the output voltage is close to the input voltage.
- Programmable input under-voltage and over-voltage lockout levels and hysteresis.
- Programmable fault detection time and automatic restart at a fixed duty cycle for the LM5067-2.
- External sense resistor for current sensing.
Applications
- Industrial computers and servers
- Redundant-array-of-independent-disk (RAID) storage
- Communications infrastructure
- Board or blade insertion into live backplanes
- Distributed power systems
- Redundant negative voltage supplies
- Central office switching systems
- Power supply hotswap & inrush control
Q & A
- What is the primary function of the LM5067MM-2/NOPB?
The primary function is to provide intelligent control of power supply connections during the insertion and removal of circuit cards from a live system backplane or other 'hot' power sources.
- What is the operating voltage range of the LM5067MM-2/NOPB?
The operating voltage range is from -9 V to -80 V.
- What type of package is the LM5067MM-2/NOPB available in?
It is available in a 10-pin MSOP or VSSOP package.
- Does the LM5067MM-2/NOPB support automatic restart after a fault?
Yes, the LM5067-2 automatically attempts restarts at a fixed duty cycle after a fault detection.
- What is the purpose of the Power Good output?
The Power Good output indicates when the output voltage is close to the input voltage.
- Can the input under-voltage and over-voltage lockout levels be programmed?
Yes, the input under-voltage and over-voltage lockout levels and hysteresis are programmable.
- What type of FET is used with the LM5067MM-2/NOPB?
An external N-Channel MOSFET is used.
- Is the LM5067MM-2/NOPB ROHS compliant?
Yes, it is ROHS compliant.
- What are some common applications of the LM5067MM-2/NOPB?
Common applications include industrial computers, RAID storage, communications infrastructure, and distributed power systems.
- How does the LM5067MM-2/NOPB protect against over-current conditions?
The LM5067MM-2/NOPB monitors for over-current conditions and can quickly switch off the series pass device upon detection of a severe over-current condition.
