View LV5771QA-2H_8529404.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

51513nkpc 20130401-s00002 no.a2178-1/12 semiconductor components industries, llc, 2013 may, 2013 http://onsemi.com lv5771qa overview lv5771qa is a step-down voltage switching regulator. features and functions ? wide input dynamic range: 8v to 42v ? current mode type ? built-in pulse-by-pulse ocp cicuit: detects over current by using on resistance of an external of an external mos external resistance for over current detection. ? over current protection: hiccup mode ? built-in output voltage correction circuit ? droops when frequency fold back is negative ? teermal shutdown ? fixed frewuency: 1mhz ? load-independent soft start circuit ? over voltage protection specifications absolute maximum ratings at ta = 25 c parameter symbol conditions ratings unit supply voltage v in max 45 v v in , sw 45 v hdrv, cboot 52 v ldrv 6v between cboot and sw, between cboot and hdrv 6v en, i lim v in +0.3 v between v in and i lim 1v v dd 6v ss, comp, fb, sdin v dd +0.3 v allowable pin voltage sns_ocp, sns_com, sns_cs 7v allowable power dissipation pd max mounted on a specified board. * 0.65 w operating temperature topr -40 to +85 c storage temperature tstg -55 to +150 c junction temperature tj max 150 c * specified board: 24.0mm 15.0mm 1.6mm, glass epoxy 2-layer board. caution 1) absolute maximum ratings represent the va lues which cannot be exceeded for any length of time. caution 2) even when the device is used within the range of abso lute maximum ratings, as a result of continuous usage under hig h temperature, high current, high voltage, or drastic temperature change, the reliability of th e ic may be degraded. please contact us for the further detai ls. orderin g numbe r : ena2178 bi-cmos ic step-down voltage switching regulator 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. ordering information see detailed ordering and shipping informa tion on page 12 of this data sheet.
lv5771qa no.a2178-2/12 recommendation operating conditions at ta = 25 c parameter symbol conditions ratings unit supply voltage range v in 8 to 42 v error amplifier input voltage v fb 0 to 1.6 v electrical characteristics at ta = 25 c, v in = 12v ratings parameter symbol conditions min typ max unit reference voltage block 5v power supply v dd i out = 0 to 5ma 4.7 5.2 5.7 v internal reference voltage v ref including offset of e/a 0.69 0.7 0.71 v triangular waveform oscillator block oscillation frequency1 f osc 1 v in = 12v ( 8v to 18v) 870 1000 1130 khz oscillation frequency2 f osc 2 v in = 24v ( 18v to 30v) 1/2 f osc 1 khz oscillation frequency3 f osc 3 v in = 36v ( 30v to 42v) 1/3 f osc 1 khz oscillation fold back sense voltage v osc_fb after power is supplied to ss, voltage is detected fb 0.5 v oscillation frequency after fold back f osc_fb 100 150 200 khz maximum on duty d max 75 % on/off circuit block en on voltage v en_on v in = 8 to 42v 3.4 4.3 v en off voltage v en_off v in = 8 to 42v 1.0 1.2 v soft start circuit block soft start source current i ss_sc en > 5v, ss = 0v 4 5 6 a soft start sink current i ss_sk en < 1v, v dd = 5v, ss = 1v 2 ma voltage to end the soft start function v ss_end 0.7 0.9 1.1 v uvlo circuit block uvlo lock release voltage v uvlo 7.0 7.4 7.8 v uvlo hysteresis v uvlo_h 0.6 v error amplifier input bias current i ea_in 100 na error amplifier trans conductance g ea 1000 1400 1800 a/v sink output current i ea_osk fb = 1.0v -100 a source output current i ea_osc fb = 0v 100 a over current limi ter circuit block1 over current detection comparator 1 offset voltage v sns_ocp (r6 = 20m ) 43.5 46 48.5 mv over current limi ter circuit block2 reference current i lim -10% 20 +10% a over current detection comparator 2 offset voltage v lim_ofs -5 +5 mv over current detection comparator 2 common mode input voltage v in -0.45 v in v over voltage protection circuit block1 over voltage detection voltage v sns_ocp 6.7 v over voltage detection voltage v sns_com 6.7 v over voltage protection circuit block2 over voltage detection voltage 2 v sdin 0.7 v continued on next page.
lv5771qa no.a2178-3/12 continued from preceding page. ratings parameter symbol conditions min typ max unit output block output stage on resistance (upper side) r onh 5 output stage on resistance (lower side) r onl 5 output stage on current (upper side) i onh 240 ma output stage on current (lower side) i onl 240 ma the whole device standby current i ccs en < 1v 100 a mean consumption current i cca en > 5v, no switching 3 ma package dimensions unit : mm (typ) 3444 vqfn16j(3.0x3.0) 3.0 0.25 3.0 0.8 max top view side view side view bottom view (1.7) (1.7) 0.4 1 12 2 16 (0.75) 0.5 0.035 0 0.4 0.6 0.2 1.0 0.8 0.65 80 0.34 0.42 60 20 40 0 100 --40 --20 ambient temperature, ta -- c allowable power dissipation, pd max -- w pd max ? ta specified board: 24.015.01.6mm 3 glass epoxy board (two-layer substrate, 4-layer board)
lv5771qa no.a2178-4/12 pin assignment 16 15 14 13 5 6 7 8 4 3 2 lv5771qa qfn16 1 en sdin comp sns_com ldrv sw hdrv cboot ss/ hiccup sns_cs sns_ocp fb v dd gnd top vie w v in i lim 9 10 11 12 pin function no pin name description 1 sns_com pin to connect a current sense resister 2 comp error amplifier output pin. connect a phas e compensation circuit between this pin and gnd. 3 sdin when voltage level of this pin is high, switchinf is tur ned off. when this pin turns low, the capacitor connected betwee n ss/hiccup and gnd discharges voltage. 4 en on/off pin. 5 cboot bootstrap capacity connection pin. this pin becomes a gate drive power supply of an external nchmosfet. connect a bypath capacitor between cboot and sw. 6 hdrv an external the upper mosfet gate drive pin. 7 sw pin to connect with switching node. the so urce of nchmosfet conn ects to this pin. 8 ldrv an external the lower mosfet gate drive pin. 9 v dd power supply pin for an external the lower mos-fet gate drive. 10 gnd ground pin. each reference voltage is based on the voltage of the ground pin. 11 v in power supply pin. this pin is monitored by uvlo function. w hen the voltage of this pin becomes 7.8v or more by uvlo function, the ic starts and the soft start function operates. 12 i lim reference current pin for current de tection. the sink current of about 20 a flows to this pin. when a resistance is connected between this pin and v in outside and the voltage applied to the sw pin is lower than the voltage of the terminal side of the resistance, the upper nchmosfet is off by operat ing the current limiter comparator. this operation is reset with respect to each pwm pulse. 13 ss/hiccup pin to connect a capacitor for soft start. a capacitor for soft start is charged by using the voltage of about 5 a.this pin ends the soft start period by using the voltage of about 1.1v and the frequency fold back function becomes active. 14 sns_cs output voltage correction rate pin. 15 sns_ocp pin to connect a current sense resister. overcurrent protector limit func tion operates when the voltage of the both ends of external sense resistance exceed 46mv. when you do not use this function, make sure to connect the pin of the external sense resistance to gnd. 16 fb error amplifier reverse input pin. by operating the conver ter, the voltage of this pin becomes 0.7v. the voltage in which the output voltage is divided by an external resistance is appli ed to this pin. also, the oscillation frequency becomes one-tenth when the voltage of this pin becomes 0.4v or less after soft start function.
lv5771qa no.a2178-5/12 block diagram en 5v regulator v in reference voltage saw wave oscillator 5 a 20 a s r q + - sd fb ss comp s r q + - current amp - + ocp comp1 v in ss/ hiccup + - ocp comp2 - + amp fb 1.1v + - hiccup comp 2v + - ovp comp2 6.7v 46mv + - ovp comp1 6.7v + - + sd ocp 0.7v + - 0.5v ss/hiccup fb comp i lim sdin ffold amp - + 1v - + 1v error amp fosc forced 1/8 dmax = 90% + - control logic uvlo cboot hdrv sw v dd ldrv gnd shut down(sd) 5v pwm comp foce 1/2 foce 1/3 tsd sns_ocp sns_com sns_cs sample application circuit q q l en ss/hiccup comp cboot c1 c7 c2 c8 c5 c3 c6 r5 r2 r10 hdrv sw ldrv sdin fb sns_cs sns_ocp sns_com v dd gnd v in i lim lv5771qa c11 c10 c13 c12 d1 c31 r16 d2 d3 d4 r8 r9
lv5771qa no.a2178-6/12 operating sequence and uvlo/tsd operation over current protection and over voltage protection sequence (ex: v in = 12v, v out = 5v) 6.8v uvlo 7.4v 0.9v fold back permit over voltage v dd soft start soft start soft start switching off ss 0.6 a discharge switching off v dd =90% tsd v in v dd ss/hiccup v out ss/hiccup v out 5.15v 5.6v sns_ocp 5.15v 1.1v 1.1v 0.2v 2.0v 6.7v sns_com 5.15v 6.7v sdin 0.7v sw ldrv 170 c 140 c ss 5 a charge over current
lv5771qa no.a2178-7/12 output voltage correction rate output voltage is increased by drawing the current proportional to the current flows along r6 (cu rrent detection resistance) from fb (error amplifier) into the ic. output voltage is obtained by the formula (1). v out = vref 1 + r 9 r 8 + 50 r 6 ? r 9 r 10 i out (1) the term that includes ?i out ? shows the increase of voltage. voltage increase is defined by setting resistance. cable voltage fall is easily adjustable. over current protector function lv5771qa integrates 2 over current protection circuits. to operate over current protector function, you need to set either one or both circuits. when 2 cirucits are set, the one with lower current limiter operation point operates first. ilim: ilim current value ilmax: the maximum value of coil current, rdson: ron between drain and source of q1 (high-side nch mos fet). ron of fw282 43m (when vgs = 4.5v at 25c). rdson of fet has its own temperature coefficient with which resistance value increases in propotion to temperature. you need to set rdson value against oper ating temperature range based on the data sheet of the fet manufacture. over current protector 1 over current protector operates when the voltage difference of both ends is 46mv or higher due to current flows into r6 (current detection resistor). over cu rrent limiter setting resistance r6 is obtained by the following formula (2). r 6 = v sns_ocp il max = 46 mv il max (2) ex) to obtain load current of 2.3a (peak current of coil) for the current limiter operating point, r6 = 20m . over current protector 2 over current protector operates when the voltage of high -side fet exceeds that of r5 . over current limiter setting resistance r5 is obtained by the following formula (3). r 5 = r ds_on il max i lim = r ds_on il max 20 u (3) ex) to obtain load current of 2.3a (peak current value of coil) for the current limiter operating point, r5 = 11k . make sure to take variation by ron (temperature change, varia tion) into consideration and confirm on the application board with optimal resistance value. for proper current limiter operation, connect a capacitor of 1000pf to c6 to filter undesired noise. data output voltage -- load current 0 50 125 25 100 0.0 0.5 load current -- a data output voltage mv 1.0 1.5 2.0 2.5 75 150 175 200 r10=150k r10=51k r10=100k r10=200k r6=20m , r9=6.2k
lv5771qa no.a2178-8/12 over voltage protector function lv5771qa has 3 over current protection circuits. the voltage protection function operates by the internal comparator for sns_ocp and sns_com. for sdin, the function operatews by adding zener diode between sdin and v out . you need to perform either one of the settings. when 3 cirucits are set, the one with lower over voltage operation point operates first. over voltage protector 1 when sns_ocp or sns_com is 6.7v or higher, hdrv signal is turned off. over voltage protector 2 make sure to connect zener diode (5.6v) between sdin and v out and the capacitor of 1000pf at c13 between sdin and gnd. when sdin is 0.7v or higher. hdrv signal is turned off.
lv5771qa no.a2178-9/12 usb car charger application circuit q q l 1 2 3 4 v+ usb d- d+ gnd 5v/2.1 a en ss/hiccup comp cboot c1 c7 c2 c8 c5 d5 c3 c6 r5 r2 r10 hdrv sw ldrv sdin fb sns_cs sns_ocp sns_com v dd gnd v in i lim c11 c10 c13 c12 d1 led c31 d2 d3 d4 r8 r9 r11 r13 r12 r15 r14 r16 bom list for 5v/2.1a car charger no reffrence designator value part no. package vender notes 1 l 3.3 h fdv0530 6mm toko dc current (max) = 4.1a 2 r2 4.7k rk73k1j 1608 koa j: 5% 3 r5 11k rk73k1j 1608 koa j: 5% 4 r6 20m erj3bwfr020v 1608 panasonic f: 1% 5 r8 1k rk73k1j 1608 koa j: 5% 6 r9 6.2k rk73k1j 1608 koa j: 5% 7 r10 100k rk73k1j 1608 koa j: 5% 8 r11 open - - - - 9 r12 open - - - - 10 r13 open - - - - 11 r14 open - - - - 12 r15 open - - - - 13 r16 4.7 rk73k1j 1608 koa j: 5% 14 c1 10 f umk325bj 3225 taiyo yuden 50vdc, x5r 15 c2 0.1 f grm188b31h 1608 murata 25vdc, b 16 c3 2.7nf grm188b11h 1608 murata 50vdc, b 17 c31 47pf grm1882c1h 1608 murata 50vdc, ch 18 c5 0.1 f grm188b31h 1608 murata 25vdc, b 19 c6 1000pf grm1882c1h 1608 murata 50vdc, ch 20 c7 1000pf grm1882c1h 1608 murata 50vdc, ch 21 c8 1 f grm188b10j 1608 murata 6.3vdc, b 22 c10 22 f grm31cb30j 3216 murata 6.3vdc, b 23 c11 open - - - - 24 c12 220pf grm1882c1h 1608 murata 50vdc, ch 25 c13 1000pf grm1882c1h 1608 murata 50vdc, ch 26 d1 - dse010 mcp2 sanyo vrrm = 90v, i o = 100ma, vf = 1.2v 27 d2 - crs12 s-flat toshiba vrrm = 60v, i o = 1a, vf = 0.52v 28 d3 open - - - - 29 d4 - nsx5v6v2t1g sod-523 onsemi 5.6v2% 30 d5 open - - - - 31 led open - - - - 32 q - fw217a-w sop8 sanyo 40v, nch dual type 33 ic lv5771qa control ic vqfn16 sanyo synchronous
lv5771qa no.a2178-10/12 electrical characteristics efficency, loss vs. load current 50 55 60 65 70 75 80 85 90 1.0 2.0 3.0 4.0 5.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 95 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 0 200 400 600 800 1000 1200 1400 0.0 0.5 1.0 1.5 2.0 0.5 1.0 1.5 2.0 10 20 30 40 10 20 30 40 10 20 30 40 10 20 30 40 2.5 50 input voltage -- v frequency, output voltage vs. input voltage frequency -- khz 0 load current -- a output voltage vs. load current output voltage -- v 0 6.0 0.0 2.5 input voltage -- v average current(comp=0v) vs. input voltage average current -- ma 0.0 4.0 050 load current -- a efficenc y -- % loss -- w 5.00 5.05 5.10 5.15 5.20 5.25 5.30 5.35 output voltage -- v 50 100 150 200 250 input voltage -- v average current(comp=0.8v) vs. input voltage average current -- m a 050 input voltage -- v stand by current(en=0v) vs. input voltage stand by current -- a 0 300 050 r10=51k ? _eff r 1 0 = 5 1 k ? _ l o s s frequency o u t p u t v o l t a g e 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 0.0 5.0
lv5771qa no.a2178-11/12 start up waveform v in =12v, v out =5v, r iload =2.67 ? 5ms 5.0v v out (dc) 2 5ms 10.0v v in 1 1 2 3 4 2 4 4 1 2 3 4 2 4 5ms 2.00a i out 4 5ms 10.0v sw 3 shutdown waveform v in =12v, v out =5v, r iload =2.67 ? 50 s 5.0v v out (dc) 2 50 s 10.0v v in 1 50 s 2.00a i out 4 50 s 10.0v sw 3 load step waveform v in =12v, v out =5v, iload=0 2.1a/10 s 0.2ms 100mv v out (ac) 2 0.2ms 1.00a i out 4 operating waveform v in =12v, v out =5v, r iload =2.67 ? 0.5 s 0.50a i l 4 0.5 s 10.0v sw 3 operating waveform v in =12v, v out =5v, r iload =2.67 ? 0.5 s 20.0mv v out (ac) 2 0.5 s 2.00a i out 4 50 s 5ms 0.5 s 0.5 s 0.2ms
lv5771qa ps no.a2178-12/12 ordering information device package shipping (qty / packing) lv5771qa-nh vqfn16j(3.0x3.0) (pb-free / halogen free) 2000 / tape & reel LV5771QA-2H vqfn16j(3.0x3.0) (pb-free / halogen free) 490 / tray 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.

▲Up To Search▲

Price & Availability of LV5771QA-2H

	To Download LV5771QA-2H Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .