UCC3916 SCSI Termpower Manager
FEATURES DESCRIPTION Integrated Circuit Breaker Function 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. Integrated 0.2 Power FET SCSI, SCSI-2, SCSI-3 Compliant 1ВµA ICC When Disabled 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. Programmable On Time Accurate 1.65A Trip Current and
2.0A Max Current Fixed 3% Duty Cycle Uni-Directional Switch Thermal Shutdown 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 1ВµA of supply current.
Other features include thermal shutdown and low thermal resistance Small
Outline Power package. BLOCK DIAGRAM REVERSE VOLTAGE
COMPARATOR 1 VIN
4V TO 6V 8 OUTPUT 50mV
+
OUTPUT CHARGE
PUMP CURRENT SENSE MAXIMUM
CURRENT
LEVEL
2A H=OPEN POWER
FET LINEAR
CURRENT …
