n1010 sy 20101102-s00002 no.a1875-1/6 http://onsemi.com semiconductor components industries, llc, 2013 august, 2013 LV5068V overview LV5068V is 1ch step-down switching regulator. the operation current is about 80 a, and low power consumption is achieved. functions ? 1ch sbd rectification controller ic ? maximum value of light load mode current is 80 a. ? built-in ocp circuit with p-by-p method ? when p-by-p is generated continuously, it shifts to the hiccup operation. ? if connect c-hiccup to gnd pin, then latch-off when over current. ? the oscillatory frequency can be set by the external pin. the oscillatory frequency is 300 khz to 2.2mhz ? built-in uvlo, tsd ? synchronous driving with external signal specifications maximum ratings at ta = 25 c parameter symbol conditions ratings unit input voltage v in max 45 v pdr,hdrv,rsns, ilim,en,pg v in v v in -pdr 6v ref 6v allowable pin voltage ss,fb,comp,rt c-hiccup,sync ref v allowable power dissipation pd max specified substrate *1 0.74 w operating temperature topr -40 to +85 ? c storage temperature tstg -55 to +150 ? c *1: specified substrate 114.3mm 76.1mm 1.6mm 3 glass-epoxy bi-cmos ic low power consumption and high efficiency step-down switching regulator controller orderin g numbe r : ena1875 stresses exceeding maximum ratings may damage the device. maximum ratings are stress ratings only. functional operation above the recommended oper ating conditions is not implied. extended exposure to stresses above the recommended operating conditions may affect device reliabili ty.
LV5068V no.a1875-2/6 recommended operating conditions at ta = 25 c parameter symbol conditions ratings unit input voltage range v in 4.5 to 40 v electrical characteristics at ta = 25 c, v in = 15v ratings parameter symbol conditions min typ max unit reference voltage internal reference voltage vref 1.241 1.260 1.279 v pch drive voltage v pdr i out =0 to -5ma v in -5.5 v in -5.0 v in -4.5 v saw wave oscillator oscillatory frequency f osc rt=470k 280 330 380 khz on/off circuit ic start-up voltage v cnt_on 1.5 v in v disable voltage v cnt_off 0 0.3v soft start circuit soft start source current i ss _sc en > 1.5v 1.3 2.0 2.7 a soft start sink current i ss _sk en < 0.3v, ss=4v 1.0 1.6 2.2 ma uvlo circuit uvlo release voltage v uvlon fb=comp 3.3 3.7 4.1 v uvlo lock voltage v uvlof fb=comp 2.5 2.9 3.3 v error amplifier input bias current i ea _in -100 -50 100 na error amplifier gain g ea 100 250 400 a/v output sink current i ea _osk fb=1.75v -40 -20 -10 a output source current i es _osc fb=0.75v 10 20 40 a over current limit circuit reference current i lim 1 48.4 55 61.6 a over current detection comparator offset voltage v lim_ofs -5 +5 mv rsns pin input range v rsns v in -0.175 v in v hiccup timer start-up cycle n lcycles 15 cycle hiccup comparator threshold voltage v thic 1.2 1.26 1.32 v hiccup timer change current i hic 12 3 a pwm comparator maximum on-duty d max 95 % logic output power good ?l? sink current i pwrgd _l pg=5v 4 5 6 ma power good ?h? leakage current i pwrgd _h pg=5v 0 1 a power good threshold voltage v tpg 1.0 1.1 1.2 v power good hysteresis v pg _h 40 50 60 mv output output on-resistance (high) r on h 3 output on-resistance (low) r on l 3 output on-current (high) i on h 500 ma output on-current (low) i on l 500 ma the entire device stand-by current i ccs en < 0.3v 0 1 a light load mode consumption current i sleep 1 en > 1.5v, no switching 30 55 80 a thermal shutdown tsd *2 150 170 190 ? c *2: design certification
LV5068V no.a1875-3/6 package dimensions unit : mm (typ) 3178b block diagram sanyo : ssop16(225mil) 5.2 4.4 6.4 0.22 0.65 (0.33) 18 9 16 0.5 0.15 1.5max 0.1 (1.3) pd max -- ta -40 -20 0 20 40 60 80 120 0.38 0 0.4 0.8 1.2 0.74 100 ambient temperature, ta -c allowable power dissipation, pd max -w specified circuit board : 114.3 76.11.6 mm 3 glass epoxy board wake-up band-gap bias + - uvlo.comp tsd + - + - hic cup.comp + - + ref pch drive 15pluse counter + - r1 r2 16.ref 7.pdr 4.v in c3 c5 c1 c10 v in r3 pwm.comp pbyp.comp + - 5.rsns 3.ilim v in level-shift pdr s q r q osc clk slope 10.rt 8.gnd r7 6.hdrv c2 c9 r4 fb r5 l d1 + - + - 2.en hi:on lo:off v in 11.c-hiccup c8 14.comp 15.fb c7 c6 12.ss 1.pg 13.nc r6 fb err.amp pg.comp 1.1v 1.26v enable q1 9. sync r8 enable
LV5068V no.a1875-4/6 pin assignment pin descriptions pin no. pin name descriptions equivalent circuit 1 pg power good pin. connect to open drain of mos-fet in ics inside. setting output voltage to "l", when fb voltage is 1.05v or less pg gnd 2 en on/off pin v in gnd en 3 ilim for current detection. sink current is about 55 a. the current limiter comparator works when an external resistor is connected between this pin and v in , and if the voltage of this resistor is less than the voltage of rsns then pch mos is turned off. this operation is reset each pwm pulse. v in gnd ilim 4 v in supply voltage pin. it is observed by the uvlo function. when its voltage becomes 3.7v or more, ics startup in soft start. v in gnd 5 rsns current detection re sistor connection pin. resistor is connected between v in and this pin, and the current flows to mosfet are measured. v in gnd rsns continued on next page. pg en ilim v in rsns hdrv pdr gnd sync rt c-hiccup ss n.c. comp fb ref 1 16 15 14 13 12 11 10 2 3 4 5 6 7 8 9 LV5068V top view
LV5068V no.a1875-5/6 continued from preceding page. pin no. pin name descriptions equivalent circuit 6 hdrv the external high-side mosfet gate drive pin. hdrv pdr v in 7 pdr gate drive voltage of the external pch mosfet. meanwhile, the bypass capaci tor is connected between v in and this pin. pdr gnd v in 8 gnd ground pin. ground pin voltage is reference voltage. v in gnd 9 sync pin of using combined of external synchronous signal input pin v in gnd sync 10 rt oscillation frequency setting pin. resistor is connected between this pin and gnd. v in gnd rt 11 c-hiccup it is capacitor connection pin for setting re-startup cycle in hiccup mode. if connect it to gnd pin, then latch-off when over current. v in gnd c-hiccup 12 ss capacitor connection pin for soft start. about 2 a current charges the soft start capacitor. v in gnd ss 13 nc nc pin. continued on next page.
LV5068V ps no.a1875-6/6 continued from preceding page. pin no. pin name descriptions equivalent circuit 14 comp error amplifier output pin. the phase compensation netw ork is connected between gnd pin and comp pin. thanks to current-mode control, comp pin voltage would tell you the output current amplit ude. comp pin is connected internally to an int.comparator which comparators with 0.9v reference. if comp pin voltage is larger than. 0.9v, ic operates in ?continuous mode?. if comp pin voltage is smaller than 0.9v, ic operates in ?discontinuous mode (low consumption mode)?. v in gnd comp 15 fb error amplifier reverse input pin. ics make its voltage keep 1.26v. output voltage is divided by external resistors and it across fb. v in gnd fb 16 ref reference voltage. v in gnd ref on semiconductor and the on logo are registered trademarks of semiconductor components industries, llc (scillc). scillc owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. a listing of scillc?s product/patent coverage may be accessed at www.onsemi.com/site/pdf/patent-marking.pdf. scillc reserves the right to make changes without further notice to any products herein. scillc mak es no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does scillc assume any liability ar ising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequentia l or incidental damages. ?typical? parameters which may be provided in scillc data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. all operating parameters, including ?typicals? must be validated for each customer application by customer?s techn ical experts. scillc does not convey any license under its patent rights nor the rights of others. scillc products are not designed, intended, or authorize d for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other appli cation in which the failure of the scillc product could create a situation where personal injury or death may occur. should buyer purchase or use scillc products for any such unintended or unauthorized application, buyer shall indemnify and hold scillc and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of persona l injury or death associated with such unintended or unauthorized use, even if such claim alleges that scillc was negligent regarding the design or manufacture o fthe part. scillc is an equal opportunity/affirmative action employer. this literature is subject to all applicable copyright laws a nd is not for resale in any manner.
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