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| Bay Linear Linear Excellence 3.0A Low Dropout Voltage Regulator Adjustable B1085 Description The Bay Linear B1085 is Monolithic low power 3.0A Adjustable and fixed NPN voltage regulator that are easy to use with minimum external components. All internal circuitry is designed to operate down to 1V input to output differential and the dropout voltage is fully specified as a function of load current. Dropout is guaranteed at a maximum of 1.5V at a maximum output current. Current limit is trimmed, minimizing the stress on both the regulator and power source circuitry under overload conditions. It is suitable for applications requiring a well-regulated positive output voltage with low input-output differential voltage. The B1085 Outstanding features include full power usage up to 3.0Amp of load current internal current limiting and thermal shutdown. A 10 F output capacitor is required on these new devices; how ever, this is usually included in most regulator design. The B1085 is offered in a 3-pin TO-220, TO-263 & TO-252 packages compatible with other 3 terminal regulators. For 5A Low dropout Regulator refer to the BL1084 data sheet. Features * * * * * * * Adjustable Output Down to 1.2V Output Current of 3.0A Low Dropout Voltage 1.0V Typ. 0.015% Line Regulation 0.01% Load Regulation Current & Thermal Limiting Standard 3-Terminal Low Cost TO-220, D2, D Packages Similar to industry Standard LT1085 * Applications * * * * * * Constant Current Regulators SMPS Post Regulator High Efficiency Linear Regulator High Efficiency Linear Power Supplies Battery Charger Adjustable Power Supplies Pin Connection Ordering Information Devices B1085T B1085S B1085D TO-263-3 (S) TO-252 (D) Package TO-220 TO-263 TO-252 Temp. 0 C to 70 C 0 C to 70 C 0 C to 70 C Bay Linear 1 2 3 1 2 3 ADJ/ GND V OU VIN T Front View Top View Bay Linear, Inc 2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 989-7144, Fax: (925) 940-9556 www.baylinear.com B1085 Absolute Maximum Rating Parameter Maximum Input Voltage Power Dissipation Thermal Resistance Junction to Case Thermal Resistance Junction to Ambient Operating Junction Temperature Range Control Section Power Transistor Storage Temperature Range Lead Temperature (Soldering 10 Sec.) Symbol VIN PO JC JA TJ Value 30 Internally Limited 3 50 Unit V W C/W C TSTG TLEAD 0 to 125 0 to 150 -65 to 150 300 Electrical Characteristics (VIN = 4.75V to 5.25V; IO = 10mA to 3.0Amp, unless otherwise specified) Parameter Symbol Conditions Reference Voltage VO IO = 10mA,T= 25 C, Vin-Vout =3V 10mAIOUTIFULL LOAD 1.5V(Vin-Vout) 25V (Note3) ILOAD = 10mA, 1.5V(VIN - VOUT) 15V T= 25 C 15V(Vin-Vout) 30V (Vin-Vout)=3V 10mAIOUTIFULL LOAD T= 25 C T= 25 C Over Temperature (Vin-Vout)=5V (Vin-Vout)=25V (Vin-Vout)= 25V T= 25 C, 30ms pulse T= 25 C, 1000Hrs T= 25 C Over Temp. F=120Hz, CADJ=25F, COUT=25F Tantalum IOUT=IFULL LOAD, (Vin-Vout)=3V (Note 5) TO-220 Junction to Tab Junction to Ambient DD Package Junction to Tab Junction to Ambient MIN 1.238 1.225 TYP 1.250 MAX 1.262 1.270 0.20 0.20 0.50 0.30 0.40 1.5 4 0.5 10 0.02 1 UNIT V Line Regulation (1) REG (line) 0.015 0.035 0.05 0.1 0.2 1.3 3.2 0.2 10 0.004 0.3 0.5 55 60 75 3.0 60 3.0 60 % Load Regulation (1) REG (LOAD) Dropout Voltage Current Limit Minimum Load Current Temperature Regulation Long Term Stability Temperature Stability Adjust pin Current Ripple Rejection Thermal Resistance VD IS IMIN LOAD TA TS RA - V A mA %/W % A 120 dB 3.0 60 3.0 60 C/W Note: Output Switch tests are performed under pulsed conditions to minimize power dissipation Bay Linear, Inc 2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 989-7144, Fax: (925) 940-9556 www.baylinear.com Advance Information- These data sheets contain descriptions of products that are in development. The specifications are based on the engineering calculations, computer simulations and/ or initial prototype evaluation. Preliminary Information- These data sheets contain minimum and maximum specifications that are based on the initial device characterizations. These limits are subject to change upon the completion of the full characterization over the specified temperature and supply voltage ranges. The application circuit examples are only to explain the representative applications of the devices and are not intended to guarantee any circuit design or permit any industrial property right to other rights to execute. Bay Linear takes no responsibility for any problems related to any industrial property right resulting from the use of the contents shown in the data book. Typical parameters can and do vary in different applications. Customer's technical experts must validate all operating parameters including " Typical" for each customer application. LIFE SUPPORT AND NUCLEAR POLICY Bay Linear products are not authorized for and should not be used within life support systems which are intended for surgical implants into the body to support or sustain life, in aircraft, space equipment, submarine, or nuclear facility applications without the specific written consent of Bay Linear President. Bay Linear, Inc 2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 989-7144, Fax: (925) 940-9556 www.baylinear.com |
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