FEATURES
• Integrated Circuit Breaker Function
• Integrated 0.2 Power FET
• SCSI, SCSI-2, SCSI-3 Compliant
• 1μA ICC When Disabled
• Programmable On Time
• Accurate 1.65A Trip Current and
2.0A Max Current
• Fixed 3% Duty Cycle
• Uni-Directional Switch
• Thermal Shutdown

DESCRIPTION
The UCC3916 SCSI termpower manager provides complete power management,
hot swap capability, and circuit breaker functions with minimal external
components. For most applications, the only external component
required to operate the device, other than supply bypassing, is a timing capacitor
which sets the fault time.
The current trip level is internally set at 1.65A, and the maximum current
level is also internally programmed for 2A. While the output current is below
the trip level of 1.65A, the internal power MOSFET is switched on at a nominal
220mΩ. When the output current exceeds the trip level but remains
less than the maximum current level, the MOSFET remains switched on,
but the fault timer starts charging CT. Once the fault time is reached, the circuit
will shut off for a time which equates to a 3% duty cycle. Finally, when
the output current reaches the maximum current level, the MOSFET transitions
from a switch to a constant current source.
The UCC3916 is designed for uni-directional current flow, emulating a diode
in series with the power MOSFET.
The UCC3916 can be put in a sleep mode, drawing only 1μA of supply current.
Other features include thermal shutdown and low thermal resistance Small
Outline Power package.