Texas Instruments LM5067 Negative Hot Swap/Inrush Current Controller
Texas Instruments LM5067 Negative Hot-Swap/Inrush Current Controller is designed for intelligent control of the power supply connections during insertion and removal of circuit cards from a live system backplane or other “hot” power sources. The LM5067 also offers in-rush current control to limit system voltage droop and transients.
Power dissipation and current limit in the external series pass N-Channel MOSFET are programmable, allowing operation within the Safe Operating Area (SOA). Additionally, the LM5067 provides circuit protection by monitoring for over-current and over-voltage conditions.
The POWER GOOD output featured on the Texas Instruments LM5067 Controller indicates when the output voltage is close to the input voltage. The input under-voltage lockout level, over-voltage lockout level, hysteresis, and fault detection time are all programmable. The LM5067-1 latches off after a fault detection, while the LM5067-2 automatically tries to restart at a fixed duty cycle.
The LM5067 is has a wide operating range of -9V to -80V and is available in a 10-pin VSSOP or 14-pin SOIC package.
Features
- -9V to -80V Wide operating range
- The in-rush current limit for safe board insertion into live power sources
- Programmable maximum power dissipation in the external pass device
- Adjustable current limit
- Circuit breaker function for severe overcurrent events
- Adjustable undervoltage lockout (UVLO) and hysteresis
- Adjustable overvoltage lockout (OVLO) and hysteresis
- The initial insertion timer allows ringing and transients to subside after the system connection
- Programmable fault timer avoids nuisance trips
- Active high open-drain POWER GOOD output
- Available in latched fault and automatic restart versions
Applications
- Server backplane systems
- In-rush current limiting
- Solid-state circuit breaker
- Transient voltage protector
- Solid-state relay
- Undervoltage lockout
- Power good detector and indicator
Block Diagram
