The TPS2482 and TPS2483 provide hotswap control and precision monitoring for 9-V to 36-V
applications. Accurate voltage, current, and power monitoring is provided by a 16-bit A/D converter
with a serial interface that is compatible with I2C and SMBus. Voltage
and current measurements are interleaved and multiplied internally to provide concurrent power
calculations. These devices have high current monitoring accuracy over temperature and a broad load
range. This makes them well suited for applications where load identity and health is determined by
current profile, such as remote radio heads or cellular antennae.
The hotswap section drives N-channel MOSFETs, with timed inrush and fault-current
limiting. Advanced MOSFET safe operating area (SOA) protection is achieved by programmable
constant-power foldback and a fixed current limit. This results in an exponential inrush current
profile as shown in the start-up figure below. As VOUT ramps up and the
VDS of the MOSFET is reduced the current increases keeping MOSFET power
dissipation within its SOA at all times. The TPS2482 latches off after a hard fault, while the
TPS2483 automatically attempts to restart after a cool-off delay.
The TPS2482 and TPS2483 can be dropped into existing TPS2480 and TPS2481 sockets to
provide improved accuracy and operating voltage range. This can be accomplished with no PCB changes
and minor software modifications.
While the standard monitoring function is limited to 36 V, with a few external components
it is possible to monitor buses as high as 80 V. See special application description in High Voltage Application Example.
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