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UCC381DPTR-3G4 Datasheet(PDF) 1 Page - Texas Instruments |
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UCC381DPTR-3G4 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 10 page UCC281-3/-5/-ADJ UCC381-3/-5/-ADJ SLUS214B -JANUARY 2001 FEATURES • Precision Positive Linear Voltage Regulation • 0.5V Dropout at 1A • Guaranteed Reverse Input/ Output Voltage Isolation with Low Leakage • Low Quiescent Current Irrespective of Load • Adjustable Output Voltage Version • Fixed Versions for 3.3V and 5V Outputs • Logic Shutdown Capability • Short Circuit Power Limit of 3% • VIN • Current Limit • Remote Load Voltage for Accurate Load Regulation DESCRIPTION The UCC381-3/-5/-ADJ family of positive linear series pass regulators is tailored for low drop out applications where low quiescent power is impor- tant. Fabricated with a BiCMOS technology ideally suited for low input to output differential applications, the UCC381 will pass 1A while requiring only 0.5V of input voltage headroom. Dropout voltage decreases linearly with output current, so that dropout at 200mA is less than 100mV. Quies- cent current is always less than 650 µA. To prevent reverse current conduc- tion, on-chip circuitry limits the minimum forward voltage to typically 50mV. Once the forward voltage limit is reached, the input-output differential volt- age is maintained as the input voltage drops until undervoltage lockout dis- ables the regulator. UCC381-3 and UCC381-5 versions have on-chip resistor networks preset to regulate either 3.3V or 5.0V, respectively. Furthermore, remote sensing of the load voltage is possible by connecting the VOUTS pin directly at the load. The output voltage is then regulated to 1.5% at room temperature and better than 2.5% over temperature. The UCC381-ADJ version has a regu- lated output voltage programmed by an external user-definable resistor ra- tio. (continued) Low Dropout 1 Ampere Linear Regulator Family 1VOUT 2GND 7 GND R2 R1 + – V PUMP UVLO + – 8 1.3/2.1A CURRENT REFERENCE VIN UCC381-ADJ UCC381-3 UCC381-5 R2 R1 0 OPEN 82k 50k 150k 50k 4 3GND 6 GND 1.25V VOUTS VOLTAGE AMPLIFIER CURRENT LIMIT THERMAL SHUTDOWN REVERSE VOLTAGE SENSE 3% DUTY CYCLE CURRENT LIMIT TIMER 5 0.65V CT* SHUTDOWN FOR FIXED VERSIONS *ADJ VERSION ONLY BLOCK DIAGRAM UDG-98112 |
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