The LT4201 provides a compact hot-swap solution with an internal
power metal-oxide semiconductor field effect transistor (MOSFET),
enabling a circuit board to be safely inserted and removed from
a powered backplane. The safe operating area of the internal
MOSFET is production tested and guaranteed for stresses during
hot-swap events.
During startup, the LT4201 regulates the MOSFET gate to output a
constant current to charge up the board capacitors. During normal
operation, trilevel overcurrent protection is provided by an electronic
circuit breaker, a current limit, and a fast comparator. The exposed
pad of the LT4201 effectively transfers MOSFET heat to the printed
circuit board (PCB), which coupled with the low MOSFET on resistance,
enables high-current applications without direct airflow.
Device behavior can be finely tuned through an extensive register
set, providing digital adjustment of multiple parameters. Board
voltage, current, power, energy, and temperature are measured by
two analog-to-digital converters (ADCs) and read through a 1 MHz
capable PMBus™ interface. Internal electrically erasable programmable
read-only memory (EEPROM) stores device configuration
and provides black box recording of fault conditions.
APPLICATIONS
- Data center servers
- Data storage systems
- Intelligent electronic fuse
- Network routers and switches
- Server fan protection
- 5G MIMO antenna protection
