Pinout
SpecificationsInput voltage range±, VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -16V
Shutdown voltage range, SD/CT . . . . . . . . . . . . . . . . . . . . . . .5 V to 6 V
Operating virtual junction temperature range, TJ . . . . . . .55 to 150
Storage temperature range Tstg. . . . . . . . . . . . . . . . . . . . .65 to 150
Lead temperature (Soldering, 10 seconds) . . . . . . . . . . . . . . . . . .300DescriptionThe UCC384-x family of negative linear-series pass regulators is tailored for low-dropout applications where low-quiescent power is important. Fabricated with a BCDMOS technology ideally suited for low input-to-output differential applications, the UCC384-x passes 0.5 A while requiring only 0.2 V of input-voltage headroom. Dropout voltage decreases linearly with output current, so that dropout at 50 mA is less than 20 mV.
Quiescent current consumption for the device UCC384-
x under normal (non-dropout) conditions is typically 200 ?A. An integrated charge pump is internally enabled only when the device is operating near dropout with low VIN. This ensured that the device meets the dropout specifications even for maximum load current and a VIN of ¨C3.2 with only a modest increase in quiescent current. Quiescent current is always less than 350 ?A, with the charge pump enabled. The quiescent current of the UCC384 does not increase with load current.
UCC384-x Short-circuit current is internally limited. The device responds to a sustained overcurrent condition by turning off after a t
ON delay. The device then stays off for a period, t
OFF , that is 40 times the t
ON delay. The device UCC384-x then begins pulsing on and off at the t
ON/t
OFF duty cycle of 2.5%. This drastically reduces the power dissipation during short circuit such that heat sinking, if at all required, must only accommodate normal operation. An external capacitor sets the on time. The off time is always 40 times t
ON.
UCC284-5 Data Sheet
