N2576S-5

NIKO-SEM 52 KHz 3A Step-Down Switching Voltage Regulator (SVR) FEATURES N2576 TO-263, TO220 GENERAL DESCRIPTION T he N2576 Series switching voltage regulators (SVR) are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, B o t h s e r ie s a re ca p a b l e o f d r i v i n g 3 A load respectively with excellent line and load regulation. The N2576 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 N2576 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. Pin compatible with industry products of LM2576 Series Adjustable output versions W ide output voltage range, 1.23V to 27V for adjustable output version DC-to-DC buck converter requiring only 4 external parts 52 KHz fixed frequency internal oscillator TTL shutdown capability, low power stand -by mode High efficiency Uses readily available standard inductors APPLICATIONS Simple high-efficiency step-down (buck) regulator Positive to negative converter (Inverting Buck-Boost) Isolated Fly back Converter using minimum number of external parts Powering portable instrument, Set-Top Box, LCD Monitor, Scanner, I.A, Easy PC SMPS Post-Regulator TYPICAL APPLICATION 8V - 27V Unregulated DC Input 1 +Vin 3 Gnd Cin 100uF + D1 1N5822 4 N2576 2 5 On/Of f 100uH R1 6.18K + Cout 1000uF R2 2K Feedback Output L1 +5V, 3A Regulated Output * VOUT = 1.23V ( 1 + R1 / R2) Adjustable Regulator in Fixed Output Application 1 MAY-31-2001 NIKO-SEM 52 KHz 3A Step-Down Switching Voltage Regulator (SVR) N2576 TO-263, TO220 ABSOLUTE MAXIMUM RATINGS Maximum Supply Voltage ON/OFF Pin Input Voltage Output Voltage to Ground (Stead State) Power Dissipation Thermal Resistance Junction to Case, θJC 30V -0.3≤V≤+VI -1V Internally Limited 2.0°C/W Thermal Resistance Junction to Ambient, θJA TO-220 TO-263 Operating Junction Temperature Range Storage Temperature Range Lead Temperature (Soldering, 10 Seconds) 50°C/W 60°C/W -40 to 125°C -65 to 150°C 260°C ELECTRICAL CHARACTERISTICS (Unless otherwise specified, TA = 25°C.) Parameter Feedback Voltage Feedback Voltage Efficiency Feedback Bias Current Oscillator Frequency Saturation Voltage Symbol VOUT VOUT η IB FOSC VSAT VIH VIL IIH IIL IOUT = 3A (N2576) N2576 VOUT = 0V VOUT = Nominal Output Voltage ON/OFF Pin = 5V (OFF) ON/OFF Pin = 0V (ON) Test Conditions VIN = 12V, VOUT = 5V ILOAD = 0.5A (N2576) 8V ≤ VIN ≤ 27V 0.5A ≤ ILOAD ≤ 3A (N2576) VIN = 12V, VOUT = 5V IOUT = 3A (N2576) VOUT = 5V Typical 1.230V 1.230V 77% 50nA 52 KHz 1.4V 6.0A 1.4V 1.2V 12µA 0µA 100nA 47 KHz (Min) 58 KHz (Max) 1.8VMax 4.0A ~ 7.0A 2.2V (Min) 1.0V (Max) 30µA (Max) 10µA (Max) Limits 1.217VMin 1.243VMax 1.193VMin 1.267VMax Current Limit ICL ON/OFF Pin Logic Input Level ON/OFF Pin Logic Input Current DEVICE SELECTION GUIDE Device Voltage (V) Current (A) Package TO-263 TO-263 TO-263 N2576S ADJ N2576S-3.3 N2576S-5 3.3 5 3 TO-220 TO-220 TO-220 N2576T ADJ N2576T-3.3 N2576T-5 3.3 5 2 MAY-31-2001 NIKO-SEM 52 KHz 3A Step-Down Switching Voltage Regulator (SVR) N2576 TO-263, TO220 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 MAY-31-2001 NIKO-SEM 52 KHz 3A Step-Down Switching Voltage Regulator (SVR) TO-220 (5-Lead) MECHANICAL DATA mm N2576 TO-263, TO220 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 MAY-31-2001 NIKO-SEM 52 KHz 3A Step-Down Switching Voltage Regulator (SVR) N2576 TO-263, TO220 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 MAY-31-2001