1 52 khz 3a step - down switching voltage regulator (svr) n2576 g - 3.3 to - 220, to263 l ead - free feb - 0 2 - 200 5 niko - sem general description the n2576 g 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 exc ellent line and load regulation. the n2576 g 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 g 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. features l pin compatible with industry products of lm2576 g 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) regulat or l positive to negative converter (inverting buck - boost) l isolated fly back converter using mini - mum number of external parts l powering portable instrument, set - top box, lcd monitor, scanner, i.a, easy pc l smps post - regulator typical app lication dc input 3 feedback n2576 +3.3v,3a cin 100uf regulated d1 1n5822 4 output 8v - 27v unregulated cout 1000uf 2 l1 100uh output 1 gnd 5 +vin on/off
2 52 khz 3a step - down switching voltage regulator (svr) n2576 g - 3.3 to - 220, to263 l ead - free feb - 0 2 - 200 5 niko - sem absolute maximum ratings l maximum supply voltage 30v l on/off pin input voltage - 0.3 v +v i l thermal resistance junction to ambient, q ja to - 220 to - 263 50c/w 60c/w l output voltage to ground (stead state) - 1v l operating junction temperature range - 40 to 125c l power dissipation internally limited l storage temperature range - 65 to 150c l thermal resistance junction to case, q jc 2.0c/w l lead temperature (soldering, 10 seconds) 260c electri cal characteristics ( unless otherwise specified, t a = 25c.) parameter symbol test conditions typical limits output voltage v out v in = 12v i load = 0.5a 3.3v 3.234v min 3.366v max output voltage v out 8v v in 27v 0.5a i load 3a 3.3v 3.168v min 3. 450v max efficiency b v in = 12v, v out = 3.3v i out = 3a 75% oscillator frequency f osc 52 khz 47 khz (min) 58 khz (max) saturation voltage v sat i out = 3a 1.4v 1.8v max current limit i cl 6.0a 4.0a ~ 7.0a v ih v out = 0v 1.4v 2.2v (min) on/off pin logic input level v il v o ut = nominal output voltage 1.2v 1.0v (max) i ih on/off pin = 5v (off) 12 m a 30 m a (max) on/off pin logic input current i il on/off pin = 0v (on) 0 m a 10 m a (max) remark: orders for parts with lead - free plating can be placed using the n2576xg - 3.3 parts name.
3 52 khz 3a step - down switching voltage regulator (svr) n2576 g - 3.3 to - 220, to263 l ead - free feb - 0 2 - 200 5 niko - sem device selection guide device n2576s g - 3.3 n2576t g - 3.3 volt age (v) 3.3 3.3 current(a) 3 package to - 263 to - 220 marking n2576s g - 3.3 n2576t g - 3.3 pin configurations 5 - on/off 4 - feedback 3 - ground 1 - vin 2 - output ground ground 2 - output 1 - vin 3 - ground 4 - feedback 5 - on/off 5 -lead to-220 (t) 5 -lead to-263 (s)
4 52 khz 3a step - down switching voltage regulator (svr) n2576 g - 3.3 to - 220, to263 l ead - free feb - 0 2 - 200 5 niko - sem to - 220 (5 - lead) mechanical data mm mm dimension min. typ. max. dimen sion min. typ. max. a 9.78 10.16 10.54 h 1.57 1.7 1.83 b 2.61 2.74 2.87 i 6.81 c 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 7
5 52 khz 3a step - down switching voltage regulator (svr) n2576 g - 3.3 to - 220, to263 l ead - free feb - 0 2 - 200 5 niko - sem to - 263 (d 2 pak, 5 - lead) mechanical data mm mm dimension min. typ. max. dimension min. typ. max. a 14.5 15 15.8 h 1.0 1.5 1.8 b 4.2 4.7 i 9.8 10.3 c 1.20 1.35 j 6.5 d 2.8 k 1.5 e 0.3 0.4 0.5 l 0.7 0.85 1.0 f - 0.102 0.203 m 1.57 1.7 1.83 g 8. 5 9 9.5 n
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