Maker : National Semiconductor
Part No. : 2575T-12

  Datasheet PDF : 2575T-12.pdf
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Product Information

www.DataSheet.co.kr LM1575/LM2575/LM2575HV Series SIMPLE SWITCHER 1A Step-Down Voltage Regulator August 2004 LM1575/LM2575/LM2575HV SIMPLE SWITCHER ® 1A Step-Down Voltage Regulator General Description The LM2575 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 1A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3V, 5V, 12V, 15V, and an adjustable output version. Requiring a minimum number of external components, these regulators are simple to use and include internal frequency compensation and a fixed-frequency oscillator. The LM2575 series offers a high-efficiency replacement for popular three-terminal linear regulators. It substantially reduces the size of the heat sink, and in many cases no heat sink is required. A standard series of inductors optimized for use with the LM2575 are available from several different manufacturers. This feature greatly simplifies the design of switch-mode power supplies. Other features include a guaranteed ± 4% tolerance on output voltage within specified input voltages and output load conditions, and ± 10% on the oscillator frequency. External shutdown is included, featuring 50 µA (typical) standby current. The output switch includes cycle-by-cycle current limiting, as well as thermal shutdown for full protection under fault conditions. Features n 3.3V, 5V, 12V, 15V, and adjustable output versions n Adjustable version output voltage range, 1.23V to 37V (57V for HV version) ± 4% max over line and load conditions n Guaranteed 1A output current n Wide input voltage range, 40V up to 60V for HV version n Requires only 4 external components n 52 kHz fixed frequency internal oscillator n TTL shutdown capability, low power standby mode n High efficiency n Uses readily available standard inductors n Thermal shutdown and current limit protection n P+ Product Enhancement tested Applications n n n n Simple high-efficiency step-down (buck) regulator Efficient pre-regulator for linear regulators On-card switching regulators Positive to negative converter (Buck-Boost) Typical Application Versions) (Fixed Output Voltage 01147501 Note: Pin numbers are for the TO-220 package. SIMPLE SWITCHER ® is a registered trademark of National Semiconductor Corporation. © 2004 National Semiconductor Corporation DS011475 www.national.com Datasheet pdf - http://www.DataSheet4U.net/ www.DataSheet.co.kr LM1575/LM2575/LM2575HV Block Diagram and Typical Application 01147502 3.3V, R2 = 1.7k 5V, R2 = 3.1k 12V, R2 = 8.84k 15V, R2 = 11.3k For ADJ. Version R1 = Open, R2 = 0Ω Note: Pin numbers are for the TO-220 package. FIGURE 1. Connection Diagrams number.) Straight Leads 5–Lead TO-220 (T) (XX indicates output voltage option. See Ordering Information table for complete part Bent, Staggered Leads 5-Lead TO-220 (T) 01147522 01147523 01147524 Top View LM2575T-XX or LM2575HVT-XX See NS Package Number T05A Top View Side View LM2575T-XX Flow LB03 or LM2575HVT-XX Flow LB03 See NS Package Number T05D www.national.com 2 Datasheet pdf - http://www.DataSheet4U.net/ www.DataSheet.co.kr LM1575/LM2575/LM2575HV Connection Diagrams (XX indicates output voltage option. See Ordering Information table for complete part number.) (Continued) 16–Lead DIP (N or J) 24-Lead Surface Mount (M) 01147525 *No Internal Connection Top View LM2575N-XX or LM2575HVN-XX See NS Package Number N16A LM1575J-XX-QML See NS Package Number J16A 01147526 *No Internal Connection Top View LM2575M-XX or LM2575HVM-XX See NS Package Number M24B TO-263(S) 5-Lead Surface-Mount Package 01147529 Top View 01147530 Side View LM2575S-XX or LM2575HVS-XX See NS Package Number TS5B Ordering Information Package Type 5-Lead TO-220 Straight Leads NSC Package Number T05A Standard Voltage Rating (40V) LM2575T-3.3 LM2575T-5.0 LM2575T-12 LM2575T-15 LM2575T-ADJ 5-Lead TO-220 Bent...

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