52 KHz 3A Step-Down Switching Voltage Regulator (SVR) NIKO-SEM N2576 TO-263, TO220 GENERAL DESCRIPTION FEATURES The 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. z Pin compatible with industry products of LM2576 Series z Adjustable output versions z Wide output voltage range, 1.23V to 27V for adjustable output version z DC-to-DC buck converter requiring only 4 external parts z 52 KHz fixed frequency internal oscillator z TTL shutdown capability, low power stand -by mode z High efficiency z Uses readily available standard inductors APPLICATIONS z Simple high-efficiency step-down (buck) regulator z Positive to negative converter (Inverting Buck-Boost) z Isolated Fly back Converter using minimum number of external parts z Powering portable instrument, Set-Top Box, LCD Monitor, Scanner, I.A, Easy PC z SMPS Post-Regulator TYPICAL APPLICATION 8V - 27V Unregulated DC Input 1 +Vin 4 N2576 Feedback Output +5V, 3A Regulated Output L1 2 3 Gnd Cin 100uF 5 On/Of f 100uH R1 6.18K + + D1 1N5822 Cout 1000uF R2 2K * VOUT = 1.23V ( 1 + R1 / R2) Adjustable Regulator in Fixed Output Application 1 MAY-31-2001 52 KHz 3A Step-Down Switching Voltage Regulator (SVR) NIKO-SEM N2576 TO-263, TO220 ABSOLUTE MAXIMUM RATINGS z Maximum Supply Voltage z Thermal Resistance Junction to Ambient, θJA TO-220 TO-263 z Operating Junction Temperature Range z Storage Temperature Range z Lead Temperature (Soldering, 10 Seconds) 30V z ON/OFF Pin Input Voltage -0.3≤V≤+VI z Output Voltage to Ground (Stead State) -1V z Power Dissipation Internally Limited z Thermal Resistance Junction to Case, θJC 2.0°C/W 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 Symbol Test Conditions Typical Limits Feedback Voltage VOUT VIN = 12V, VOUT = 5V ILOAD = 0.5A (N2576) 1.230V Feedback Voltage VOUT 8V ≤ VIN ≤ 27V 0.5A ≤ ILOAD ≤ 3A (N2576) 1.217VMin 1.243VMax 1.230V 1.193VMin 1.267VMax Efficiency Feedback Bias Current Oscillator Frequency Saturation Voltage η VIN = 12V, VOUT = 5V IOUT = 3A (N2576) 77% IB VOUT = 5V 50nA 47 KHz (Min) 58 KHz (Max) 1.8VMax 52 KHz FOSC Current Limit ICL ON/OFF Pin Logic Input Level ON/OFF Pin Logic Input Current 100nA VSAT IOUT = 3A (N2576) 1.4V VIH VIL IIH IIL N2576 VOUT = 0V VOUT = Nominal Output Voltage ON/OFF Pin = 5V (OFF) ON/OFF Pin = 0V (ON) 6.0A 1.4V 1.2V 12µA 0µA 4.0A ~ 7.0A 2.2V (Min) 1.0V (Max) 30µA (Max) 10µA (Max) DEVICE SELECTION GUIDE Device N2576S Voltage (V) ADJ N2576S-3.3 N2576S-5 3.3 5 N2576T-3.3 N2576T-5 ADJ 3.3 5 TO-220 TO-220 TO-220 3 Current (A) Package N2576T TO-263 TO-263 TO-263 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) Ground 5 - On/Off 4 - Feedback 3 - Ground 2 - Output 1 - Vin 5 -LEAD TO-263 (S) Ground 5 - On/Off 4 - Feedback 3 - Ground 2 - Output 1 - Vin 3 MAY-31-2001 NIKO-SEM 52 KHz 3A Step-Down Switching Voltage Regulator (SVR) N2576 TO-263, TO220 TO-220 (5-Lead) MECHANICAL DATA mm Dimension mm Dimension Min. Typ. Max. A 9.78 10.16 10.54 H B 2.61 2.74 2.87 I C Min. Typ. Max. 1.57 1.7 1.83 6.81 J 4.4 4.6 4.8 D 28.5 28.9 29.3 K 1.14 1.27 1.4 E 14.6 15.0 15.4 L 2.3 2.6 2.9 F 8.4 8.8 9.2 M 0.26 0.46 0.66 G 0.73 0.83 0.93 N 4 7° 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 mm Min. Typ. Max. A 14.5 15 15.8 B 4.2 C 1.20 D Dimension Min. Typ. Max. H 1.0 1.5 1.8 4.7 I 9.8 1.35 J 6.5 K 1.5 2.8 E 0.3 F -0.102 G 8.5 0.4 9 10.3 0.5 L 0.7 0.85 1.0 0.203 M 1.57 1.7 1.83 9.5 N 5 MAY-31-2001