UCC384-ADJ

UCC284–5, UCC284–12, UCC284–ADJ, UCC384–5, UCC384–12, UCC384–ADJ LOW-DROPOUT 0.5-A NEGATIVE LINEAR REGULATOR D Precision Negative Series Pass Voltage Regulation D 0.2 V Dropout at 0.5 A D Wide Input Voltage Range –3.2 V to –15 V D Low Quiescent Current Irrespective of Load D Simple Logic Shutdown Interfacing D –5 V, –12 V, and Adjustable Output D 2.5% Duty Cycle Short Circuit Protection description SLUS234D – JANUARY 2000 – REVISED FEBRUARY 2002 DP PACKAGE (FRONT VIEW) VOUTS 1 8 SD/CT VIN 2 7 VIN VIN 3 6 VIN GND 4 5 VOUT The 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 under normal (non-dropout) conditions is typically 200 µA. 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 –3.2 V with only a modest increase in quiescent current. Quiescent current is always less than 350 µA, with the charge pump enabled. The quiescent current of the UCC384 does not increase with load current. Short-circui...