The MAX5924/MAX5925/MAX5926 1V to 13.2V hot-swap
controllers allow the safe insertion and removal of circuit
cards into live backplanes. These devices hot swap supplies
ranging from 1V to 13.2V provided that the device
supply voltage, VCC, is at or above 2.25V and the hot-swapped
supply, VS, does not exceed VCC.
The MAX5924/MAX5925/MAX5926 hot-swap controllers
limit the inrush current to the load and provide a circuit-breaker
function for overcurrent protection. The devices
operate with or without a sense resistor. When operating
without a sense resistor, load-probing circuitry
ensures a short circuit is not present during startup,
then gradually turns on the external MOSFET. After the
load probing is complete, on-chip comparators provide
overcurrent protection by monitoring the voltage drop
across the external MOSFET on-resistance. In the event
of a fault condition, the load is disconnected.
The devises include many integrated
features that reduce component count and
design time, including configurable turn-on voltage,
slew rate, and circuit-breaker threshold. An on-board
charge pump provides the gate drive for a low-cost,
external n-channel MOSFET.
The MAX5924/MAX5925/MAX5926 are available with
open-drain PGOOD and/or active-low PGOOD outputs. The
MAX5925/MAX5926 also feature a circuit breaker with
temperature-compensated RDS(ON) sensing. The
MAX5926 features a selectable 0ppm/°C or 3300ppm/°C
temperature coefficient. The MAX5924 temperature coefficient
is 0ppm/°C and the MAX5925 temperature coefficient
is 3300ppm/°C. Autoretry and latched fault-management
configurations are available (see the
Selector Guide in the full data sheet).
Applications
- Base Stations
- Network Routers and Switches
- Portable Device Bays
- RAID
- Remote-Access Servers
- Servers
