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| NIKO-SEM 52 KHz 3A Step-Down Switching Voltage Regulator (SVR) FEATURES N2576G-3.3 TO-220, TO263 Lead-Free GENERAL DESCRIPTION The N2576G Series switching voltage regulators (SVR) are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, Both series are capable of driving 3 A load respectively with excellent line and load regulation. The N2576G Series SVR include a switching regulator and compensation network all within the same package. Just add a choke, catch diode and two capacitors to obtain an efficient DC-to-DC converter. The output switch includes cycle-by-cycle current limit -ing, as well as thermal shutdown for full protection under fault conditions. The N2576G Series SVR offer replacement for popular 3 terminal linear regulators by providing higher efficiency with reduced heat sink size. In many applications a heat sink will not be required. l Pin compatible with industry products of LM2576G Series l Fixed 3.3V output version l Wide output voltage range, 1.23V to 27V for adjustable output version l DC-to-DC buck converter requiring only 4 external parts l 52 KHz fixed frequency internal oscillator l TTL shutdown capability, low power stand -by mode l High efficiency l Uses readily available standard inductors APPLICATIONS l Simple high-efficiency step-down (buck) regulator l Positive to negative converter (Inverting Buck-Boost) l Isolated Fly back Converter using minimum number of external parts l Powering portable instrument, Set-Top Box, LCD Monitor, Scanner, I.A, Easy PC l SMPS Post-Regulator TYPICAL APPLICATION 8V - 27V Unregulated DC Input +Vin 1 4 Feedback +3.3V,3A Regulated 2 Output L1 N2576 3 5 On/Off D1 Output 100uH Gnd Cin 100uF 1N5822 Cout 1000uF 1 Feb-02-2005 NIKO-SEM 52 KHz 3A Step-Down Switching Voltage Regulator (SVR) N2576G-3.3 TO-220, TO263 Lead-Free ABSOLUTE MAXIMUM RATINGS l Maximum Supply Voltage l ON/OFF Pin Input Voltage l Output Voltage to Ground (Stead State) l Power Dissipation l Thermal Resistance Junction to Case, JC 30V -0.3V+V I -1V Internally Limited 2.0C/W l Thermal Resistance Junction to Ambient, JA TO-220 TO-263 l Operating Junction Temperature Range l Storage Temperature Range l Lead Temperature (Soldering, 10 Seconds) 50C/W 60C/W -40 to 125C -65 to 150C 260C ELECTRICAL CHARACTERISTICS (Unless otherwise specified, TA = 25C.) Parameter Output Voltage Output Voltage Efficiency Oscillator Frequency Saturation Voltage Current Limit ON/OFF Pin Logic Input Level ON/OFF Pin Logic Input Current Symbol VOUT VOUT b FOSC VSAT ICL VIH VIL IIH IIL IOUT = 3A VOUT = 0V VOUT = Nominal Output Voltage ON/OFF Pin = 5V (OFF) ON/OFF Pin = 0V (ON) Test Conditions VIN = 12V ILOAD = 0.5A 8V VIN 27V 0.5A ILOAD 3A VIN = 12V, V OUT = 3.3V IOUT = 3A Typical 3.3V 3.3V 75% 52 KHz 1.4V 6.0A 1.4V 1.2V 12A 0A 47 KHz (Min) 58 KHz (Max) 1.8VMax 4.0A ~ 7.0A 2.2V (Min) 1.0V (Max) 30A (Max) 10A (Max) Limits 3.234VMin 3.366VMax 3.168VMin 3.450VMax REMARK: Orders for parts with Lead-Free plating can be placed using the N2576XG-3.3 parts name. 2 Feb-02-2005 NIKO-SEM 52 KHz 3A Step-Down Switching Voltage Regulator (SVR) N2576G-3.3 TO-220, TO263 Lead-Free DEVICE SELECTION GUIDE Device Voltage (V) Current(A) Package Marking TO-263 N2576SG-3.3 N2576SG-3.3 3.3 3 TO-220 N2576TG-3.3 N2576TG-3.3 3.3 PIN CONFIGURATIONS 5 -LEAD TO-220 (T) 5 - On/Off Ground 4 - Feedback 3 - Ground 2 - Output 1 - Vin 5 -LEAD TO-263 (S) 5 - On/Off Ground 4 - Feedback 3 - Ground 2 - Output 1 - Vin 3 Feb-02-2005 NIKO-SEM 52 KHz 3A Step-Down Switching Voltage Regulator (SVR) TO-220 (5-Lead) MECHANICAL DATA mm N2576G-3.3 TO-220, TO263 Lead-Free mm Max. 10.54 2.87 29.3 15.4 9.2 0.93 Dimension H I J 4.4 1.14 2.3 0.26 K L M N Min. 1.57 Typ. 1.7 6.81 4.6 1.27 2.6 0.46 7 4.8 1.4 2.9 0.66 Max. 1.83 Dimension A B C D E F G Min. 9.78 2.61 28.5 14.6 8.4 0.73 Typ. 10.16 2.74 28.9 15.0 8.8 0.83 4 Feb-02-2005 NIKO-SEM 52 KHz 3A Step-Down Switching Voltage Regulator (SVR) N2576G-3.3 TO-220, TO263 Lead-Free TO-263 (D2PAK, 5-Lead) MECHANICAL DATA mm Dimension A B C D E F G 0.3 -0.102 8.5 9 Min. 14.5 4.2 1.20 2.8 0.4 0.5 0.203 9.5 Typ. 15 Max. 15.8 4.7 1.35 Dimension H I J K L M N 0.7 1.57 Min. 1.0 9.8 6.5 1.5 0.85 1.7 1.0 1.83 mm Typ. 1.5 Max. 1.8 10.3 5 Feb-02-2005 |
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