MCP18480
-48V Hot Swap Controller
Features Description Allows safe board removal and insertion from a
live backplane Accurate (<1.5%) internal voltage reference for
fault detection and precision timing Programmable foldback current limiting Programmable circuit breaker current limiting Auto restart option for all faults Adjustable Undervoltage lockout thresholds Adjustable Overvoltage protection threshold Adjustable Power Good delay Configurable Power Good output polarity Low-side drive of an external N-channel FET The MCP18480 is a Hot Swap controller that allows
boards to be safely removed or inserted from an active
backplane using -48V. CMOS Technology High-Voltage Operation Temperature range: Industrial (I): -40В°C to +85В°C Packaging 20-lead SSOP Package Type
SSOP
1 20 OVTH 2 19 ENABLE UVTH 3 18 PWRGOOD UVHYS 4 17 OVO UVD 5 VREFOUT 6 MCP18480 VPOS RESTART 16 DRAINTH 15 VFB VREFIN 7 14 GATE CL 8 13 SENSE ISET 9 12 RDISCH 10 11 VNEG TIMER пѓЈ 2002-2012 Microchip Technology Inc. When PCBs are inserted into a live backplane, highpeak or transient currents from the source are generated due to the charging of the bypass capacitors on
the supply. The high transient currents can destroy
connectors and capacitors. The high inrush current can
pull the input voltage BUS down and reset the system.
The MCP18480 solves this problem by controlling the
slew rate of the backplane voltage to the board so that
these transients are eliminated. This allows boards to
be removed and inserted without causing damage to
connector pins and input bulk capacitors, in addition to
preventing false resets to the other boards on the
backplane.
The MCP18480 can be used in applications in several
areas including: Telecom Line Cards
Network Switches
Network Routers and Servers …