ts2596 preliminary 1-6 2003/12 rev. a ts2596 preliminary 3a step down switching voltage regulator pin assignment: 1. input 2. output 3. ground 4. feedback 5. enable 150khz oscillating frequency output current up to 3a enable input control general description the ts2596 series are step-down switching regulators with all required active functions. it is capable of driving 3a load with excellent line and load regulations. these devices are available in fixed output voltages of 3.3v, 5v, and an adjustable output version. the ts2596 series operates at a switching frequency of 150khz thus allowing smaller sized filter components than what would be needed with lower frequency switching regulators. it substantially not only reduces the area of board size but also the size of heat sink, and in some cases no heat sink is required. the 4% tolerance on output voltage within specified input voltages and output load conditions is guaranteed. also, the oscillator frequency accuracy is within 10%. external shutdown is included. featuring 70a (typical) standby current. the output switch includes cycle-by-cycle current limiting, as well as thermal shutdown for full protection under fault conditions. this series are offered in 5-pin to-263, to-220 package. ordering information note: where xx denotes voltage option, available are 5v and 3.3v. leave blank for adjustable version. contact factory for additional voltage options. part no. operating temp. package ts2596cz5 xx ts2596cz5 to-220-5l ts2596cm5 xx ts2576cm5 -40 ~ +125 o c to-263-5l features ? guaranteed 3a output current ? 3.3v, 5v, and adjustable versions ? wide input voltage range, up to 30v ? internal oscillator of 150khz fixed frequency ? wide adjust version output voltage range, from 1.23v to 25v 4% max. at over line and load conditions. ? low standby current, typ. 70a, at shutdown mode ? requires only 4 external components ? thermal shutdown and current limit protection ? p+ product enhancement tested applications ? lcd monitors ? add-on cards switching regulators ? high efficiency step-down regulators ? efficient pre-regulator for linear regulator absolute maximum rating input voltage vin +30 v enable pin input voltage vin (operate) -0.3v v vin v power dissipation p d internal limited w operating junction temperature range t j -40 ~ +125 o c storage temperature range t stg -65 ~ +150 o c lead soldering temperature (260 o c) 5 s
ts2596 preliminary 2-6 2003/12 rev. a thermal performance condition symbol limits unit thermal resistance junction to ambient ja 30 thermal resistance junction to case jc 3 o c/w recommended operating conditions ( ta = 25 o c) condition symbol limits unit input voltage vin 4.5 ~ 28 v enable pin input voltage vin (operate) 0 ~ +20 v block diagram electrical characteristics vin = 12v, i l = 500ma, ta = 25 o c unless otherwise specified. parameter conditions min typ max unit ts2596-3.3v output voltage (note 1) 0.2a i l 3a, 5.07v vin 30v (figure 1) 0.96|vo| 3.3 1.04|vo| v efficiency vin=12v, i l =3a -- 75 -- % ts2596-5v output voltage (note 1) 0.2a i l 3a, 8v vin 40v (figure 1) 0.96|vo| 5.0 1.04|vo| v efficiency vin=12v, i l =3a -- 80 -- %
ts2596 preliminary 3-6 2003/12 rev. a electrical characteristics (continued) vin = 12v, i l = 500ma, ta = 25 o c unless otherwise specified. ts2596 adjustable feedback voltage (note 1) 0.2a i l 3a, 8v vin 40v, vout=5v (figure 2) 0.96|vo| 1.23 1.04|vo| v efficiency vin=12v, vout=5v, i l =3a -- 75 -- % all output voltage version (vin= 12v, i l = 500ma) oscillator frequency (note 2) 127 150 173 khz quiescent current (note 3) -- 5 10 ma standby current enable =5v -- 70 200 ua saturation voltage (note 4) i load =3a -- 1.2 1.5 v feedback bias current v out =5v (adj. version only) -- 50 100 na duty cycle (note 5) operating (on) 93 98 -- % current limit (note 2)(note 4) -- 4.5 -- a v out =0v -- 0.3 2 output leakage current (note 3) v out =-1v -- 7.5 30 ma v ih (v out =0v) 2.0 -- -- enable threshold voltage v il (v out =normal output voltage) -- -- 0.6 v i ih (enable =5v) -- 12 30 enable input current i ih (enable =0v) -- 0 10 ua note 1: external components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance. refer to application information for details. note 2: the oscillator frequency reduces when the second stage current limit is activated. the amount of reduction is determined by the severity of current over load. note 3: for these parameters, fb is removed from v out and connected to +12v to force the output transistor off. note 4: v out pin sourcing current. no diode, inductor or capacitor connected to v out. note 5: fb is removed from v out and connected to 0v.
ts2596 preliminary 4-6 2003/12 rev. a typical application circuit figure 1 fixed voltage version figure 2: adjustable voltage version figure 3: lc filter for low output ripple
ts2596 preliminary 5-6 2003/12 rev. a application data quick design component select ion table for fixed output input / output condition i nductor output capacitor nichicon pl series sprague 595d series output (v) load current (a) max. input voltage (v) inductance (uh) current (a) uf v uf v 8 22 3.5 560 25 330 10 15 33 3.5 330 35 330 10 3 25 47 3.5 270 35 330 10 9 22 3.1 470 25 330 10 15 68 3.1 180 35 270 10 5 2 25 68 3.1 180 35 270 10 5 22 3.5 470 25 390 6.3 12 22 3.5 560 35 390 6.3 3 25 33 3.5 680 35 390 6.3 6 22 3.1 470 25 390 6.3 12 33 3.1 330 35 390 6.3 3.3 2 25 47 3.1 330 35 330 10 quick design component selectio n table for adjustable output input / output conditi on output capacitor nichicon pl series sprague 595d series feedforword capacitor output (v) uf v uf v value unit 2 820 35 330 10 33 nf 4 470 35 330 10 10 nf 6 470 25 330 10 3.3 nf 9 330 25 330 10 1.5 nf 12 330 25 270 10 1 nf 15 220 35 270 10 680 pf 24 150 35 390 6.3 560 pf schottky diode selection table (taiwan semiconductor part number) reverse voltage forward rectified current (4~6a) (v) surface mount through hole 20 -- sr502 30 sk53c sr503 40 sk54c sr504
ts2596 preliminary 6-6 2003/12 rev. a to-220-5l mechanical drawing to-220 dimension millimeters inches dim min max min max a 10.00 10.50 0.394 0.413 b 3.240 4.440 0.128 0.175 c 2.440 2.940 0.096 0.116 d 0.260 1.020 0.010 0.040 e 1.570 1.830 0.062 0.072 f 13.31 14.13 0.524 0.556 g 4.475 5.225 0.176 0.206 h 1.170 1.370 0.046 0.054 i 27.60 29.44 1.087 1.159 j 2.175 2.925 0.086 0.115 k 0.297 0.477 0.012 0.019 l 8.280 8.800 0.326 0.346 m 6.010 6.510 0.237 0.256 n 14.29 15.31 0.563 0.603 to-263-5l mechanical drawing b d c a j i h g f e to-263 dimension millimeters inches dim min max min max a 10.220 10.260 0.402 0.404 b 14.600 15.870 0.575 0.625 c 0.750 0.770 0.030 0.030 d 1.573 1.827 0.062 0.072 e 4.560 4.570 0.179 0.180 f 1.240 1.270 0.049 0.050 g 2.280 2.790 0.090 0.110 h 0.280 0.320 0.011 0.013 i 8.240 8.280 0.324 0.326 j 1.540 1.800 0.060 0.071 c d b f e a n l i k j m h g
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