LM25069 Datasheet | National Semiconductor

LM25069 Positive Low Voltage Power Limiting Hot Swap Controller .. July 15, 2009 Positive Low Voltage Power Limiting Hot Swap Controller General Description The LM25069 positive hot swap controller provides 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 LM25069 provides in-rush current control to limit system voltage droop and transients. The current limit and power dissipation in the external series pass N-Channel MOSFET are programmable, ensuring operation within the Safe Operating Area (SOA). The POWER GOOD output indicates when the output voltage is within 1.3V of the input voltage. The input under-voltage and over-voltage lockout levels and hysteresis are programmable, as well as the initial insertion delay time and fault detection time. The LM25069-1 latches off after a fault detection, while the LM25069-2 automatically restarts at a fixed duty cycle. The LM25069 is available in a 10 pin MSOP package. Features - Operating range: +2.9V to +17V - 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 Adjustable under-voltage lockout (UVLO) and hysteresis Adjustable over-voltage lockout (OVLO) 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 Applications - Server Backplane Systems - Base Station Power Distribution Systems - Solid State Circuit Breaker Package - MSOP-10 Typical Application Positive Power Supply Control © 2009 National...