ts2596 3a / 150khz buck dc-dc converter 1/9 version: e13 to - 220 - 5l to - 263 - 5l (d 2 pak) general description the ts2596 series are step-down switching regulator s with all required active functions. it is capable of driving 3a load with excellent line and load regulations. t hese 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 compo nents than what would be needed with lower frequency swit ching regulators. it substantially not only reduces the area of board size but also the size of heat sink, and in s ome cases no heat sink is required. the 4% toleran ce on output voltage within specified input voltages and output load conditions is guaranteed. also, the oscillator frequency accuracy is within 10%. external shutdown is inclu ded. featuring 100 a (typical) standby current. the output switch includes cycle-by-cycle current limiting, as well as thermal shutdown for full protection under fault conditions. features output voltage: 3.3v, 5v & adjustable version adjustable output voltage range 1.23v~38.5v 150khz fixed switching frequency voltage mode non-synchronous pwm control thermal shutdown and current limit protection on/off shutdown control input high efficiency short circuit protect (scp) operating voltage can be up to 40v output load current 3a low power standby mode built-in switching transistor on chip ordering information part no. package packing ts2596cz5 xx c0 to-220-5l 50pcs / tube ts2596cm5 xx rn to-263-5l 800pcs / 13 reel note: where xx denotes voltage option, available are 50 = 5.0v 33 = 3.3v leave blank for adjustable version application simple high-efficiency step down regulator on-card switching regulators positive to negative converter absolute maximum rating parameter symbol limit unit maximum supply voltage v cc +45 v recommend operating supply voltage v op +4.5 to +40 v sw, en pin input voltage v sw , v en -0.3 to +40 v feedback pin voltage v fb -0.3 to +12 v power dissipation p d internally limited w output voltage to ground v out -1 v storage temperature range t st -65 to +150 o c operating temperature range t op -40 to +125 o c esd susceptibility (hbm) 2 kv pin definition : 1. input 2. sw output 3. ground 4. feedback 5. enable
ts2596 3a / 150khz buck dc-dc converter 2/9 version: e13 thermal information parameter symbol maximum unit thermal resistance* (junction to case) to-220-5l ? jc 2 o c/w to-263-5l 2 thermal resistance* (junction to ambient) to-220-5l ? ja 50 o c/w to-263-5l 50 note: ? ja is measured with the pcb copper area (need connect to ground pins) of approximately 1.5 in 2 (multi- layer) electrical specifications (all output voltage versi on) (ta = 25 o c unless otherwise noted, v in =12v for 3.3v, 5v, adjustable version. i load =0.3a) parameter symbol test condition min typ max unit output feedback adj v fb 4.5v v in 40v 0.2a i load 3a 1.180 1.23 1.280 v efficiency h v in =12v, i load =3a, v out =5v -- 77 -- % output feedback 3.3v v fb 4.75v v in 40v 0.2a i load 3a 3.135 3.3v 3.465 v efficiency h v in =12v, i load =3a -- 75 -- % output feedback 5v v fb 7v v in 40v 0.2a i load 3a 4.75 5 5.25 v efficiency h v in =12v, i load =3a -- 80 -- % feedback bias current i fb v fb =1.3v (adj version only) -- 10 100 na oscillator frequency f osc 127 150 173 khz soft-start time t ss rising edge of en on to i cl -- 3 -- ms current limit i cl pear current, no outside circuit v fb =0v force driver on 3.3 -- -- a oscillator frequency of short circu it protect f scp when current limit occurred and v fb <0.5v, ta = 25 o c 110 150 173 khz saturation voltage v sat i out =3a, no outside circuit v fb =0v force driver on -- 1.15 1.50 v on/off pin logic input threshold voltage v il low (regulator on) -- 1.3 0.6 v v ih high (regulator off) 2.0 -- on/off pin logic input current i h v logic =2.5v (off) -- 5 15 a i l v logic =0.5v (on) -- 0.02 5 maximum duty cycle (on) dc v fb =0v force driver on -- 100 -- % maximum duty cycle (off) v fb =12v force driver off -- 0 -- quiescent current i q v fb =12v force driver off -- 5 10 ma standby quiescent current i stby on/off pin=5v -- 80 200 a v in =40v 250 sw pin leakage current sw pin = 0 i swl no outside circuit, v fb =12v force driver off -- 0.3 2 ma sw pin = -1 v in =12v -- 7.5 30 ma
ts2596 3a / 150khz buck dc-dc converter 3/9 version: e13 block diagram typical application circuit 1. adjustable output voltage version vin=12v c2 0.1uf d1 b340a l1 33uh 1 2 c3 470uf c1 470uf u1 1 2 3 4 5 vcc sw fb en vss vout=5.0v/3a vin=12v on/off c6 0.1uf r2 1.5k r1 4.7k vin=24v c2 0.1uf d1 b340a l1 47uh 1 2 c3 470uf c1 470uf u1 1 2 3 4 5 vcc sw fb en vss vout=5.0v/3a vin=24v c6 0.1uf r2 1.5k r1 4.7k v out = v fb (1 + r2 r1 ), v fb = 1.23v, r2 = 0.7k ~ 3k v out r2 r1 5.0v 1.5k 4.7k 3.3v 1.5k 2.5k 2.5v 1.5k 1.5k
ts2596 3a / 150khz buck dc-dc converter 4/9 version: e13 typical application circuit (continue) 2. fixed output voltage version c2 0.1uf d1 b340a l1 47uh 1 2 c3 470uf c1 470uf u1 1 2 3 4 5 vcc sw fb en vss vout=5.0v/3a vin=24v c6 0.1uf l1 recommend value (i out =3a,) v out 2.5v 3.3v 5v 12v v in =12v 33uh 33uh 33~47uh na v in =24v 33uh 33uh 47uh 68uh pin function description vcc this is the positive input supply for the ic switch ing regulator. a suitable input bypass capacitor mu st be presented at this pin to minimize voltage transients and to s upply the switching currents needed by the regulato r. ground circuit ground sw output internal switch. the voltage at this pin switches b etween (+vcc C vsat) and approximately C 0.5v, with a duty cycle of approximately vout / vcc. to minimize coupling t o sensitive circuitry, the pc board copper area con nected to this pin should be minimized. feedback sense the regulated output voltage to complete the feedback loop. enable allows the switching regulator circuit to be shutdo wn using logic level signals thus dropping the tota l input supply current to approximately 100ua. pulling this pin be low a threshold voltage of approximately 1.3v turns the regulator on, and pulling this pin above 1.3v (up to a maximu m of vcc) shuts the regulator down. if this shutdow n feature is not needed, the en pin can be wired to the ground p in. thermal considerations the ts2596 is available in two packages, a to-220-5 l and to-263-5l. the to-220-5l package needs a heat sink under most conditions. the size of the heat sink depends on th e input voltage, the output voltage, the load current and t he ambient temperature. the ts2596 junction tempera ture rises above ambient temperature for a 3a load and differe nt input and output voltages. the data for these c urves was taken with the ts2596 (to-220-5l package) operating as a buck switching regulator in an ambient temper ature of 25 o c (still air). these temperature rise numbers are a ll approximate and there are many factors that can affect these temperatures. higher ambient temperatures req uire more heat sinking. the to-263-5l surface mount package tab is designed to be soldered to the copper on a printed circuit board. the copper and the board are the heat sink for this pac kage and the other heat producing components, such as the catch diode and inductor. the pc board copper area that the package is soldered to should be at least 0.8 in 2 , and ideally should have 2 or more square inches of 2 oz . additional copper area improves the thermal chara cteristics,
ts2596 3a / 150khz buck dc-dc converter 5/9 version: e13 pin function description (continue) thermal considerations but with copper areas greater than approximately 6 in 2 , only small improvements in heat dissipation are r ealized. if further thermal improvements are needed, double sid ed, multilayer pc board with large copper areas and /or airflow are recommended. the ts2596 (to-263-5l package) junction temperature rise above ambient temperature with a 3a load for various input and output voltages. this data was taken with the circuit operating as a buck switching regulato r with all components mounted on a pc board to simulate the ju nction temperature under actual operating condition s. this curve can be used for a quick check for the approxi mate junction temperature for various conditions, b ut be aware that there are many factors that can affect the jun ction temperature. when load currents higher than 3a are used, double sided or multilayer pc boards with large cop per areas and/or airflow might be needed, especiall y for high ambient temperatures and high output voltages. for the best thermal performance, wide copper trace s and generous amounts of printed circuit board cop per should be used in the board layout. (once exception to this is the output (switch) pin, which should n ot have large areas of copper.) large areas of copper provide the best transfer of heat (lower thermal resistance) t o the surrounding air, and moving air lowers the thermal resistance even further.
ts2596 3a / 150khz buck dc-dc converter 6/9 version: e13 electrical characteristics curve figure 1. output ripple (v in =12v, v out =5v, i o =3a) figure 2. power on test wave (v in =12v, v out =5v, i o =3a) figure 3. load transient response (v in =12v, v out =5v, i o =0.2~3a) figure 4. en on test wave (v in =12v, v out =5v, i o =3a) figure 5. efficiency figure 6. efficiency
ts2596 3a / 150khz buck dc-dc converter 7/9 version: e13 to-220-5l mechanical drawing unit: millimeters marking diagram y = year code m = month code ( a =jan, b =feb, c =mar, d =apl, e =may, f =jun, g =jul, h =aug, i =sep, j =oct, k =nov, l =dec) l = lot code xx = voltage code ( 3.3 =3.3v, 5.0 =5v) = package code for adjustable type cz5 = to-220-5l
ts2596 3a / 150khz buck dc-dc converter 8/9 version: e13 to-263-5l mechanical drawing unit: millimeters marking diagram y = year code m = month code ( a =jan, b =feb, c =mar, d =apl, e =may, f =jun, g =jul, h =aug, i =sep, j =oct, k =nov, l =dec) l = lot code xx = voltage code ( 3.3 =3.3v, 5.0 =5v) = package code for adjustable type cm5 = to-263-5l)
ts2596 3a / 150khz buck dc-dc converter 9/9 version: e13 notice specifications of the products displayed herein are subject to change without notice. tsc or anyone on its behalf, assumes no responsibility or liability for any erro rs or inaccuracies. information contained herein is intended to provide a product description only. no license, express or implied, to any intellectual property rights is granted by this document. except as provided in tscs terms and co nditions of sale for such products, tsc assumes no liability wh atsoever, and disclaims any express or implied warr anty, relating to sale and/or use of tsc products includi ng liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, cop yright, or other intellectual property right. the products shown herein are not designed for use in medical, life-saving, or life-sustaining applica tions. customers using or selling these products for use i n such applications do so at their own risk and agr ee to fully indemnify tsc for any damages resulting from such i mproper use or sale.
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