LM1575/LM1575H LM2575 LM2575/ LM2575HV T0-220 TL/H/11475-1 TG-220 TL/H/11475-2 - Datasheet Archive

 

LM1575/LM1575H V/LM2575/LM2575H V Series SIMPLE SWITCHER® 1A Step-Down Voltage Regulator General Description The

 

National Semiconductor LM1575/LM1575H LM1575/LM1575H V/LM2575/LM2575H V Series SIMPLE SWITCHER® 1A Step-Down Voltage Regulator General Description The LM2575 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 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 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 juA (typical) standby current. The output switch includes cycle-by-cycle current limiting, as well as thermal shutdown for full protection under fault conditions. Features â-  3.3V, 5V, 12V, 15V, and adjustable output versions â-  Adjustable version output voltage range, 1.23V to 37V (57V for HV version) ±4% max over line and load conditions â-  Guaranteed 1A output current â-  Wide input voltage range, 40V up to 60V for HV version â-  Requires only 4 external components â-  52 kHz fixed frequency internal oscillator â-  TTL shutdown capability, low power standby mode â-  High efficiency â-  Uses readily available standard inductors â-  Thermal shutdown and current limit protection â-  P+ Product Enhancement tested Applications â-  Simple high-efficiency step-down (buck) regulator â-  Efficient pre-regualtor for linear regulators â-  On-card switching regulators â-  Positive to negative converter (Buck-Boost) Typical Application (Fixed Output Voltage Versions) 7v - iov(eov) UNREGULATED -DC INPUT LM2575/ LM2575/ LM2575HV LM2575HV -5.0 100 fiF GND 5 ON/OFF -fQOQl- ! 330 /iH i +5V REGULATED " OUTPUT °0UT 1 A Lwd 330 ¿(F Note: Pin numbers are for the T0-220 T0-220 package. Block Diagram and Typical Application TL/H/11475-1 TL/H/11475-1 3.3V, R2= 1.7k 5V, R2 = 3.1h 12V, R2 = 8.84k 15V, R2 = 11.3k For ADJ. Version R1 = Open, R2 = Oil Note: Pin numbers are for the TG-220 TG-220 package. Patent Pending FIGURE 1 TL/H/11475-2 TL/H/11475-2 oi M cn cn M Ol IO Ol -J Ol IS] Ol (TI 3 _ 3-45 bSOllEM 00clbG7G 3DÃ- â-  Powered by ICminer.com Electronic-Library Service CopyRight 2003 Absolute Maximum Ratings (noteu If Military/Aerospace specified devices are required, Minimum esd Rating please contact the National Semiconductor Sales (C = 100 pF, R = 1.5 kii) 2 kV Office/Distributors for availability and specifications. Lead Temperature Maximum Supply Voltage (Soldering, 10 sec.) 260°C LM1575/LM2575 LM1575/LM2575 45V Maximum Junction Temperature 150°C LM1575HV/LM2575HV LM1575HV/LM2575HV 63V on/off Pin input voltage -0.3V < v < +viN Operating Ratings Output Voltage to Ground Temperature Range (Steady State) -1V LM1575/LM1575HV LM1575/LM1575HV -55"C