Bay Linear Inspire the Linear Power LM2576 3.0A Step Down Switching voltage Regulator Adjustable & Fix Output Description Features The Bay Linear LM2576 contains fixed and adjustable switching voltage regulators that require a minimum of external components. All circuitry necessary to build a buck-switching regulator is included. The LM2576 is available in 3.3V; 5V, 12V & 15V fixed voltages, or an adjustable version with an output voltage range from 1.23V to 37V. The guaranteed accuracy for specified input and load conditions is 4%. The LM2576 can supply 3A with an excellent load and line regulation. Protection such as cycle-by-cycle current limiting or thermal shutdown has been designed. In standby mode, the current consumption has been minimized (200A). For 1A step-down switching regulators refer to B2575 data sheets Pin Connection * * * * * * * * * * * Guaranteed 3A Output Current High Efficiency Wide Input Voltage, up to 40V 3.3V, 5V, 12V, 15V and Adjustable Output Versions Thermal Shutdown and Current Limit Protection Requires only 4 External Components Low Power Standby Mode < 200A Typical Shutdown Capability (Standby Mode) 52kHz Fixed Frequency Internal Oscillator Uses Standard Inductors Pin-to-Pin Compatible with LM2576 Applications * * * * * Efficient Pre-Regulator for Linear Regulators On-card Switching Regulators Positive to Negative Converter (Buck-Boost) Simple High-efficiency Step-down (Buck) Portable Instruments Ordering Information PIN CONNECTIONS Devices LM2576T-X LM2576S-X LM2576J-X Package Temp. TO-220 TO-263 LPDD -40 C to 125 C -40C to 125 C -40C to 125 C X= Output Voltage (X=3.3V, 5.0V, 12V, 15V or Blank for Adjustable) Consult factory for other fixed voltages. TO-263-5 Package TO-220-5 Package BAY B2576 1 2 3 4 5 BAY B2576 1) VIN 2) VOUT 3) GND 4) FB 1 2 3 4 5 3) GND 4) FB 5) ON/OFF 5) ON/OFF Top View Bay Linear, Inc 1) VIN 2) VOUT Top View 2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556 www.baylinear.com LM2576 Absolute Maximum Rating Parameter Maximum Input Voltage Power Dissipation Off Pin Input Voltage Output Voltage Supply Voltage Operating Junction Temperature Range Control Section Power Transistor Storage Temperature Range Lead Temperature (Soldering 10 Sec.) Symbol Value Unit VIN PO 45 Internally Limited -0.3V<V<VIN -1 40 V W TJ V V -40<TJ<85 TSTG -65 to 150 TLEAD 260 C ELECTRICAL CHARACTERISTICS TA = 25C VIN = 12V, ILOAD= 100mA unless otherwise specified. Boldface type applies over full Operating Temperature Range. Parameter Conditions Typ LM2576 Min Units Max Adjustable Regulators (Note 3)(Note 8) VIN = 12V, ILOAD = 0.5A, VOUT = 5V 1.230 1.217 1.243 V Output Voltage (VOUT) 0.5A ILOAD 3A, 6V VIN 40V, VOUT =5V 1.230 1.230 1.193 1.180 1.267 1.280 V Efficiency (Note 7) VIN = 12V, ILOAD = 3A, VOUT = 5V 82 VIN = 12V, ILOAD = 0.5A, VOUT = 3.3V 0.5A ILOAD 3A, 6V VIN 40V, VOUT = 3.3V 3.3 3.234 3.366 V Output Voltage (VOUT) 3.3 3.3 3.168 3.135 3.432 3.465 V Efficiency VIN = 12V, ILOAD = 3A 75 % 3.3V Version (Note 3)(Note 9) % 5V Version (Note 3)(Note 9) VIN = 12V, ILOAD = 0.5A, VOUT = 5V 5.0 4.900 5.100 V Output Voltage (VOUT) 0.5A ILOAD 3A, 8V VIN 40V, VOUT = 5V 5.0 5.0 4.800 4.750 5.200 5.250 V Efficiency (Note 7) VIN = 12V, ILOAD = 3A, VOUT = 5V 82 % 12V Version (Note 3)(Note 9) VIN = 25V, ILOAD = 0.5A, VOUT = 12V 12 11.760 12.240 V Output Voltage (VOUT) 0.5A ILOAD 3A, 15V VIN 40V, VOUT = 12V 12 12 11.520 11.400 12.480 12.600 V Efficiency (Note 7) VIN = 25V, ILOAD = 3A 88 % 15V Version(Note 3)(Note 9) Output Voltage (VOUT) Efficiency (Note 7) Bay Linear, Inc VIN = 30V, ILOAD = 0.5A, VOUT = 15V 15 14.700 15.300 V 0.5A ILOAD 3A, 18V VIN 40V, VOUT = 15V VIN = 30V, ILOAD = 3A 15 15 88 14.400 14.250 15.600 15.750 V 2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556 % www.baylinear.com LM2576 ELECTRICAL CHARACTERISTICS TA = 25C VIN = 12V, ILOAD= 100mA unless otherwise specified. Boldface type applies over full Operating Temperature Range. LM2576 Units Parameters Conditions Min Typ Max Adjustable Regulator Feedback Bias Current VOUT = 5V 100 500 50 nA Fixed and Adjustable Regulators Oscillator Frequency 52 Saturation Voltage IOUT = 0.5A, (Note 4) 1.4 Max Duty Cycle (Note 5) 98 Peak Current, tON 3s, (Note 4) Current Limit VIN, (Note 6), Output = 0V (Note 6 ), Output = -1V Quiescent Current (Note 6) Standby Quiescent Current ON/OFF Pin = 5V (OFF) T,U package, Junction to Ambient, Thermal Resistance (Note 7) T,U package, Junction to case ON/OFF Control, Fixed & Adjustable Regulators (Note 8) (Note9) Output Leakage Current 5.8 47 42 93 4.2 3.5 7.5 5 50 58 63 1.8 2.0 VOUT = 0V 1.4 ON Input Level VOUT = 15V or 5V 1.2 OFF Logic Current ON/OFF Pin = 5V (OFF) ON Logic Current ON/OFF Pin = 0V (ON) V % 6.9 7.5 2 30 10 200 65 2 OFF Input Level kHz A mA mA A C/W 2.2 2.4 V 4 1.0 0.8 30 A 0.01 10 A V Note 1: Absolute Maxium Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate test conditions for which the device s intended to be functional, but do not guarantee specific performance limits. For quaranteed specifications and test conditions see the Electrical Characteristics. Note 2: All limits guaranteed at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature limits are 100% production tested. All limits at temperature extremes are guaranteed via testing. Note 3: External components such as the diode, inductor and capacitor can affect the system performance. Note 4: Output (pin 2) sourcing current. No diode, inductor, or capacitor connected to input. Note 5: Feedback (pin 4) removed from output and connected to 0V. Note 6: Feedback (pin 4) removed from output and connected to 12V to force the output transistor OFF. Note 7: Junction to ambient thermal resistance with approximately 1 square inches of PC board cooper surrounding the leads. Note 8: Test circuit refers to figure 2. Note 9: Test circuit refers to figure 3. Bay Linear, Inc 2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556 www.baylinear.com LM2576 Bay Linear, Inc 2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556 www.baylinear.com LM2576 Bay Linear, Inc 2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556 www.baylinear.com LM2576 Bay Linear, Inc 2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556 www.baylinear.com LM2576 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 2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556 www.baylinear.com