LP3883ES-1.5

LP3883 3A Fast-Response Ultra Low Dropout Linear Regulators August 2003 LP3883 3A Fast-Response Ultra Low Dropout Linear Regulators General Description The LP3883 is a high-current, fast-response regulator which can maintain output voltage regulation with minimum input to output voltage drop. Fabricated on a CMOS process, the device operates from two input voltages: Vbias provides voltage to drive the gate of the N-MOS power transistor, while Vin is the input voltage which supplies power to the load. The use of an external bias rail allows the part to operate from ultra low Vin voltages. Unlike bipolar regulators, the CMOS architecture consumes extremely low quiescent current at any output load current. The use of an N-MOS power transistor results in wide bandwidth, yet minimum external capacitance is required to maintain loop stability. The fast transient response of these devices makes them suitable for use in powering DSP, Microcontroller Core voltages and Switch Mode Power Supply post regulators. The parts are available in TO-220 and TO-263 packages. Dropout Voltage: 210 mV (typ) @ 3A load current. Ground Pin Current: 3 mA (typ) at full load. Shutdown Current: 60 nA (typ) when S/D pin is low. Precision Output Voltage: 1.5% room temperature accuracy. Features n n n n n n n n Ultra low dropout voltage (210 mV @ 3A typ) Low ground pin current Load regulation of 0.04%/A 60 nA typical quiescent current in shutdown 1.5% output accuracy (25˚C) TO-220, TO-263 packages Over temperature/over current protection −40˚C to +125˚C junction temperature range Applications n n n n n n n DSP Power Supplies Server Core and I/O Supplies Linear Power Supplies for PC Add-in-Cards Set-Top Box Power Supplies Microprocessor Power Supplies High Efficiency Linear Power Supplies SMPS Post-Regulators Typical Application Circuit 20062401 At least 4.7 µF of input and output capacitance is required for stability. Connection Diagrams 20062402 20062403 TO-220, Top View TO-263, Top View © 2003 National Semiconductor Corporation DS200624 www.national.com LP3883 Ordering Information Order Number LP3883ES-1.2 LP3883ESX-1.2 LP3883ET-1.2 LP3883ES-1.5 LP3883ESX-1.5 LP3883ET-1.5 LP3883ES-1.8 LP3883ESX-1.8 LP3883ET-1.8 Package Type TO263-5 TO263-5 TO220-5 TO263-5 TO263-5 TO220-5 TO263-5 TO263-5 TO220-5 Package Drawing TS5B TS5B T05D TS5B TS5B T05D TS5B TS5B T05D Supplied As Rail Tape and Reel Rail Rail Tape and Reel Rail Rail Tape and Reel Rail Block Diagram 20062424 www.national.com 2 LP3883 Absolute Maximum Ratings (Note 1) IOUT (Survival) Output Voltage (Survival) Junction Temperature Internally Limited −0.3V to +6V −40˚C to +150˚C If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Storage Temperature Range Lead Temp. (Soldering, 5 seconds) ESD Rating Human Body Model (Note 3) Machine Model (Note 10) Power Dissipation (Note 2) VIN Supply Voltage (Survival) VBIAS Supply Voltage (Survival) Shutdown Input Voltage (Survival) −65˚C to +150˚C 260˚C 2 kV 200V Internally Limited −0.3V to +6V −0.3V to +7V −0.3V to +7V Operating Ratings VIN Supply Voltage Shutdown Input Voltage IOUT Operating Junction Temperature Range VBIAS Supply Voltage (VOUT + VDO) to 5.5V 0 to +6V 3A −40˚C to +125˚C 4.5V to 6V Electrical Characteristics Limits in standard typeface are for TJ = 25˚C, and limits in boldface type apply over the full operating temperature range. Unless otherwise specified: VIN = VO(NOM) + 1V, VBIAS = 4.5V, IL = 10 mA, CIN = COUT = 4.7 µF, VS/D = VBIAS. Symbol VO Parameter Output Voltage Tolerance Conditions 10 mA < IL < 3A VO(NOM) + 1V ≤ VIN ≤ 5.5V 4.5V ≤ VBIAS ≤ 6V Typical (Note 4) 1.216 1.186 1.478 1.5 1.455 1.773 1.8 1.746 ∆VO/∆VIN ∆VO/∆IL VDO IQ(VIN) Output Voltage Line Regulation (Note 7) Output Voltage Load Regulation (Note 8) Dropout Voltage (Note 9) Quiescent Current Drawn from VIN Supply VO(NOM) + 1V ≤ VIN ≤ 5.5V 10 mA < IL < 3A IL = 3A 10 mA < IL < 3A V IQ(VBIAS) Quiescent Current Drawn from VBIAS Supply S/D MIN (Note 5) 1.198 MAX (Note 5) 1.234 1.246 1.522 Units V 1.545 1.827 1.854 %/V %/A 270 420 7 8 1 30 2 3 1 30 mV mA µA mA µA A 1.3 0.3 0.01 0.04 0.06 210 3 0.03 1 0.03 6 0.7 0.7 20 15 1 −1 ≤ 0.3V 10 mA < IL < 3A V S/D ≤ 0.3V ISC VSDT Td (OFF) Td (ON) IS/D Short-Circuit Current Output Turn-off Threshold Turn-OFF Delay Turn-ON Delay S/D Input Current VOUT = 0V Output = ON Output = OFF RLOAD X COUT