Texas Instruments' LM25061/9 positive hot swap controllers provide intelligent control of the power supply voltage to the load during insertion and removal of circuit cards from a live system backplane or other "hot" power sources. The LM25061/9 provide in-rush current control to limit system voltage droop and transients. The current limit and power dissipation, in the external series N-Channel MOSFET, are programmable, ensuring operation within the Safe Operating Area (SOA). The POWER GOOD output indicates when the output voltage exceeds a programmable threshold. The input under-voltage level and hysteresis are programmable, as well as the initial insertion delay time and fault detection time. The LM25061/9-1 latches off after a fault detection, while the LM25061/9-2 automatically restarts at a fixed duty cycle. The LM25061/9 are available in a 10-pin MSOP package.
Typical Application Diagram
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- Operating range: +2.9 V to +17 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
- Circuit breaker function for severe over-current events
- Internal high side charge pump and gate driver for external N-channel MOSFET
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- Adjustable under-voltage lockout (UVLO) and 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 and automatic restart versions
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| Applications |
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- Server backplane systems
- Base station power distribution systems
- Solid state circuit breaker
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Texas Instruments' LM25061/9 positive hot swap controllers provide intelligent control of the power supply voltage to the load during insertion and removal of circuit cards from a live system backplane or other "hot" power sources. The LM25061/9 provide in-rush current control to limit system voltage droop and transients. The current limit and power dissipation, in the external series N-Channel MOSFET, are programmable, ensuring operation within the Safe Operating Area (SOA). The POWER GOOD output indicates when the output voltage exceeds a programmable threshold. The input under-voltage level and hysteresis are programmable, as well as the initial insertion delay time and fault detection time. The LM25061/9-1 latches off after a fault detection, while the LM25061/9-2 automatically restarts at a fixed duty cycle. The LM25061/9 are available in a 10-pin MSOP package.
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