Overview
The LM5069MM-1 is a Positive High Voltage Hot Swap and In-Rush Current Controller with Power Limiting, produced by National Semiconductor (now part of Texas Instruments). This device is designed to provide intelligent control of power supply connections during the insertion and removal of circuit cards from live system backplanes or other hot power sources. It ensures safe and controlled in-rush current limiting, preventing system voltage droop and transients.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| VIN Supply Voltage | 9 | 80 | V | |
| TJ Junction Temperature | -40 | 125 | °C | |
| Power Limit Sense Voltage (PWRLIM-1) | 19 | 25 | 31 | mV |
| GATE Output Voltage in Normal Operation | 11.4 | 12 | 12.6 | V |
| PGD Off Voltage | 0 | 80 | V | |
| RθJA Junction-to-Ambient Thermal Resistance | 156 | °C/W |
Key Features
- Wide operating range: 9 V to 80 V
- In-rush current limit for safe board insertion into live power sources
- Programmable maximum power dissipation in the external pass device
- Adjustable current limit and circuit breaker function for severe overcurrent events
- Internal high side charge pump and gate driver for external N-channel MOSFET
- Adjustable undervoltage lockout (UVLO) and overvoltage lockout (OVLO) with hysteresis
- Initial insertion timer allows ringing and transients to subside after system connection
- Programmable fault timer avoids nuisance trips
- Active high open drain POWER GOOD output
- Available in latched fault (LM5069-1) and automatic restart (LM5069-2) versions
- 10-Pin VSSOP package
Applications
- Server backplane systems
- Base station power distribution systems
- Solid state circuit breaker
- 24-V and 48-V Industrial systems
Q & A
- What is the primary function of the LM5069MM-1?
The LM5069MM-1 is a Positive High Voltage Hot Swap and In-Rush Current Controller designed to control power supply connections during the insertion and removal of circuit cards from live systems.
- What is the operating voltage range of the LM5069MM-1?
The operating voltage range is from 9 V to 80 V.
- How does the LM5069MM-1 handle in-rush current?
The device limits in-rush current to ensure safe board insertion into live power sources.
- Can the power dissipation in the external pass device be programmed?
- What types of fault handling does the LM5069MM-1 offer?
The device is available in latched fault (LM5069-1) and automatic restart (LM5069-2) versions.
- What is the purpose of the POWER GOOD output?
The POWER GOOD output indicates when the output voltage is within 1.25 V of the input voltage.
- How is the initial insertion delay time set?
The initial insertion delay time is set by an external capacitor connected to the TIMER pin.
- What is the package type of the LM5069MM-1?
The device is available in a 10-Pin VSSOP package.
- What are some common applications of the LM5069MM-1?
Common applications include server backplane systems, base station power distribution systems, solid state circuit breakers, and 24-V and 48-V industrial systems.
- How is the undervoltage lockout (UVLO) and overvoltage lockout (OVLO) adjusted?
The UVLO and OVLO levels and hysteresis are programmable using external components.
