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1 Features • Wide operating range: 9 V to 80 V1• In-rush current limit for safe board insertion intolive power sources• Programmable maximum power dissipation in theexternal pass device• Adjustable current limit• Circuit breaker function for severe overcurrentevents• Internal high side charge pump and gate driver forexternal N-channel MOSFET• Adjustable undervoltage lockout (UVLO) andhysteresis• Adjustable overvoltage lockout (OVLO) andhysteresis• Initial insertion timer allows ringing and transientsto subside after system connection• Programmable fault timer avoids nuisance trips• Active high open drain POWER GOOD output• Available in latched fault and automatic restartversions• 10-Pin VSSOP package 2 Applications • Server backplane systems• Basestation power distribution systems• Solid state circuit breaker• 24-V and 48-V Industrial systems 3 Description The ZCC5069 positive hot swap controller provides 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 ZCC5069 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 1.25 V of the input voltage. The input undervoltage and overvoltage lockout levels and hysteresis are programmable, as well as the initial insertion delay time and fault detection time. The ZCC5069-1 latches off after a fault detection, while the ZCC5069-2 automatically restarts at a fixed duty cycle. ZCC5069 is available in a 10-pin VSSOP package. |
