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.