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1 Features 1• 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 • 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 hysteresis • Adjustable overvoltage 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 • 10-Pin VSSOP package 2 Applications • Server backplane systems • Base station power distribution systems • Solid state circuit breaker • 24-V and 48-V Industrial systems 3 Description The 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 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. |
