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n2112nkpc 20120801s00003 no.a21041/16 specifications of any and all sanyo semiconductor co.,ltd. products described or contained herein stipulate the performance, characteristics, and functions of the des cribed products in the independent state, and are not guarantees of the performance, characteristics, and funct ions of the described products as mounted in the customer ' s products or equipment. to verify symptoms and states that c annot be evaluated in an independent device, the customer should always evaluate and test device s mounted in the customer ' s products or equipment. any and all sanyo semiconductor co.,ltd. products describe d or contained herein are, with regard to "standard application", intended for the use as general ele ctronics equipment. the products mentioned herein shall not be intended for use for any "special application" ( medical equipment whose purpose is to sustain life, aerospace instrument, nuclear control device, burning app liances, transportation machine, traffic signal system, safety equipment etc.) that shall require extremely high le vel of reliability and can directly threaten human lives in case of failure or malfunction of the product or may cause h arm to human bodies, nor shall they grant any guarantee thereof. if you should intend to use our products f or new introduction or other application different from current conditions on the usage of automotive device, c ommunication device, office equipment, industrial equipment etc. , please consult with us about usage conditio n (temperature, operation time etc.) prior to the intended use. if there is no consultation or inquiry before t he intended use, our customer shall be solely responsible for the use. LV5980MC overview LV5980MC is 1ch dcdc converter with builtin power pch mosfet. the recommended operating range is 4.5v to 23v. the maximum current is 3a. the operating curre nt is about 63 a, and low power consumption is achieved. features and functions ? 1ch sbd rectification dcdc converter ic with built in power pch mosfet ? typical value of light load mode current is 63 a ? 4.5v to 23v operating input voltage range ? 100m highside switch ? output voltage adjustable to 1.235v ? the oscillatory frequency is 370khz ? builtin ocp circuit with pbyp method ? when pbyp is generated continuously, it shifts t o the hiccup operation ? external capacitor softstart ? under voltage lockout, thermal shutdown applications ? set top boxes ? dvd/bluray ? drivers and hdd ? lcd monitors and tvs ? point of load dc/dc converters ? office equipment ? pos system ? white goods application circuit example bi-cmos ic low power consumption and high efficiency step-down switching regulator ordering number : ena2104 40 30 20 10 50 60 70 80 90 1 2 3 5 7 10 2 3 5 7 100 2 3 5 7 1000 2 3 5 7 2 3 5 7 load current ma e f ficiency % 0 100 0.1 10000 v out = 5v v i n = 8 v v i n = 1 2 v v i n = 1 5 v e f ficiency v in gnd v in LV5980MC pdr c1: grm31cb31e106k [murata]c2: c2102jb0j106m [tdk] l1: fdve1040-100m [toko] d1: sb3003ch [sanyo] sw fb refcomp ss/hiccup c1 c3 10 f 2 10 f 3 l1 10 h 1 f c7 r1 d1 r3 5v vout c2 r2 47k 1 f c6 4.7nf c5 2.2nf
LV5980MC no.a21042/16 specifications absolute maximum ratings at ta = 25 c parameter symbol conditions ratings unit input voltage v in max 25 v allowable pin voltage v in -sw 30 v v in -pdr 6 v ref 6 v ss/hiccup ref v fb ref v comp ref v allowable power dissipation pd max specified substr ate *1 1.35 w operating temperature topr -40 to +85 c storage temperature tstg -55 to +150 c *1 specified substrate : 50.0mm 50.0mm 1.6mm, fiberglass epoxy printed circuit board, 4 l ayers note 1 : absolute maximum ratings represent the val ues which cannot be exceeded for any length of time . note 2 : even when the device is used within the ra nge of absolute maximum ratings, as a result of con tinuous usage under high temperature, high current, high voltage, or drastic temperature change, the re liability of the ic may be degraded. please contact us for the further details. recommended operating conditions at ta = 25 c parameter symbol conditions ratings unit input voltage range v in 4.5 to 23 v electrical characteristics at ta = 25c, v in = 15v parameter symbol conditions ratings unit min typ max reference voltage internal reference voltage v ref 1.210 1.235 1.260 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 310 370 430 khz soft start circuit soft start ? source current i ss _sc 1.2 1.8 2.4 a soft start ? sink current i ss _sk v in = 3v, ss = 0.4v 300 a uvlo circuit uvlo release voltage v uvlon fb = comp 3.3 3.7 4.1 v uvlo lock voltage v uvlof fb = comp 3.02 3.42 3.82 v error amplifier input bias current i ea _in -100 -10 na error amplifier gain g ea 100 220 380 a/v output sink current i ea _osk fb = 1.75v -30 -17 -8 a output source current i ea _osc fb = 0.75v 8 17 30 a over current limit circuit current limit peak i cl 3.5 4.7 6.2 a hiccup timer start-up cycle n cyc 15 cycle hiccup comparator threshold voltage v thic 0.15 v hiccup timer discharge current i hic 0.25 a pwm comparator maximum on-duty d max 94 % output output on resistance r on i o = 0.5a 100 m the entire device light load mode consumption current i sleep no switching 63 83 a thermal shutdown tsd design guarantee *2 170 c *2 : design guarantee: signifies target value in de sign. these parameters are not tested in an indepen dent ic.
LV5980MC no.a21043/16 package dimensions unit : mm (typ) 3424 specified substrate sanyo : soic8 4.9 3.9 6.0 1 2 8 0.835 0.375 0.2 0.42 1.27 0.175 1.75 max top bottom 2 nd /3 rd layers 0 1.0 0.5 2.0 1.5 1.35 80 0.70 60 20 40 0 100 --40 --20 pd max C t a ambient temperature, ta c allowable power dissipation, pd max w
LV5980MC no.a21044/16 pin assignment pin function description pin no, pin name function 1 pdr pch mosfet gate drive voltage. the bypass capacitor is necessarily connected betwe en this pin and v in . 2 gnd ground pin. ground pin voltage is reference v oltage 3 ss/hiccup capacitor connection pin for soft start and setting re-startup cycle in hiccup mode. about 1.8ua current charges the soft start capacito r. 4 comp error amplifier output pin. the phase compensation network is connected between gnd pin and comp pin. thanks to current-mode control, comp pin voltage wo uld tell you the output current amplitude. comp pin is connected internally to an init.comparator which compares wit h 0.9v reference. if comp pin voltage is larger tha n 0.9v, ic operates in continuous mode. if comp pin voltage is smaller than 0.9v, ic operates in discontinuous mode (low consumption mode). 5 fb error amplifier reverse input pin. ics make its voltage keep 1.235v. output voltage is divided by external resistances a nd it across fb. 6 ref reference voltage. 7 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. 8 sw high-side pch mosfet drain pin. 1 pdr 2 gnd 3 ss/hiccup 4 comp sw 8 v in 7 ref 6 fb 5 LV5980MC soic8 top view
LV5980MC no.a21045/16 block diagram wake-up level-shift tsd uvlo.comp ss_end.comp pwm comp pbyp.comp band-gap bias 1.235v 15pulse counter ilim logic osc s r ck q ocp.comp ref pch drive lnit.comp slope clk gnd pdr error.amp enable hiccup_sd v in comp fb sw ref pdr gnd ss/hiccup enable hiccup_sd hiccup_sd q
LV5980MC no.a21046/16 pin equivalent circuit pin no. pin name equivalent circuit 1 pdr v in gnd pdr 1.5m w 1.3m w 10k w 10k w 10 w 2 gnd v in gnd 3 ss/hiccup v in ss/hiccup gnd 10k 10k 1k 1k 4 comp v in comp gnd 1k w 1k w 70k w 5 fb v in fb gnd 10k w 1k w 1k w continued on next page.
LV5980MC no.a21047/16 continued from preceding page. pin no. pin name equivalent circuit 6 ref v in ref gnd 10 w 10 w 51k w 1m w 450k w 7 v in v in gnd 8 sw v in sw 22m w
LV5980MC no.a21048/16 detailed description power-save feature the LV5980MC has powersaving feature to enhance ef ficiency when the load is light. by shutting down unnecessary circuits, operating cu rrent of the ic is minimized and high efficiency is realized. output voltage setting output voltage (v out ) is configurable by the resistance r3 between v out and fb and the r2 between fb and gnd. v out is given by the following equation (1). v out = (1 + r3 r2 ) v ref = (1 + r3 r2 ) 1.235 [v] (1) soft start soft start time (t ss ) is configurable by the capacitor (c5) between ss/ hiccup and gnd. the setting value of t ss is given by the equation (2). t ss = c5 v ref i ss = c5 1.235 1.8 10 6 [ms] (2) hiccup over-current protection overcurrent limit (i cl ) is set to 4.7a in the ic. when the peak value of inductor current is higher than 4.7a for 15 consecutive times, the protection deems it as over current and stops the ic. stop period (t hic ) is defined by the discharging time of the ss/hiccup. when ss/hiccup i s lower than 0.15v, the ic starts up. when ss/hiccu p is higher than 0.3v and then over current is detected, the ic stops again. and when ss/hiccup is higher t han 1.235v, the discharge starts again. when the protection does no t detect overcurrent status, the ic starts up agai n. the ic stops when the peak value of inductor curren t is higher than overcurrent limit for 15 consecutive times. * the stop time defined by the discharging time of the ss/hiccup. the ic starts up when ss/hiccup is lower than 0.15v. ? the ic stops when ss/hiccup is higher than 0.3v and overcurrent is detected. ? the ic starts up again if no overcurrent is detected. i cl ilss/hiccup 1.235v 0.3v 0.15v t hic fb
LV5980MC no.a21049/16 design procedure inductor selection when conditions for input voltage, output voltage a nd ripple current are defined, the following equati ons (3) give inductance value. l = v in v out i r t on (3) t on = 1 {((v in v out ) (v out + vf)) + 1} f osc f osc : oscillatory frequency vf : forward voltage of schottky barrier diode v in : input voltage v out : output voltage ? inductor current: peak value (i rp ) current peak value (i rp ) of the inductor is given by the equation (4). i rp = i out + v in v out 2l t on (4) make sure that rating current value of the induct or is higher than a peak value of ripple current. ? inductor current: ripple current (?i r ) ripple current (?i r ) is given by the equation (5). i r = v in v out l t on (5) when load current (i out ) is less than 1/2 of the ripple current, inductor current flows discontinuously. output capacitor selection make sure to use a capacitor with low impedance for switching power supply because of large ripple cur rent flows through output capacitor. this ic is a switching regulator which adopts curre nt mode control method. therefore, you can use capa citor such as ceramic capacitor and os capacitor in which equival ent series resistance (esr) is exceedingly small. effective value is given by the equation (6) becaus e the ripple current (ac) that flows through output capacitor is saw tooth wave. i c_out = 1 2 3 v out (v in v out ) l f osc v in [arms] (6) input capacitor selection ripple current flows through input capacitor which is higher than that of the output capacitors. therefore, caution is also required for allowable r ipple current value. the effective value of the ripple current flows thr ough input capacitor is given by the equation (7). i c_in = d (1 d) i out [arms] (7) d = t on t = v out v in in (7), d signifies the ratio between on/off period . when the value is 0.5, the ripple current is at a maximum. make sure that the input capacitor does not exceed the allowa ble ripple current value given by (7). with (7), if v in =15v, v out =5v, i out =1.0a and f osc =370 khz, then i c_in value is about 0.471arms. in the board wiring from input capacitor, v in to gnd, make sure that wiring is wide enough to ke ep impedance low because of the current fluctuation. make sure to co nnect input capacitor near output capacitor to lowe r voltage bound due to regeneration current.when change of load current is excessive (i out : high ? low), the power of output electric capacitor is regenerated to input capacitor. if inp ut capacitor is small, input voltage increases. the refore, you need to implement a large input capacitor. regeneration pow er changes according to the change of output voltag e, inductance of a coil and load current.
LV5980MC no.a210410/16 selection of external phase compensation component this ic adopts current mode control which allows us e of ceramic capacitor with low esr and solid polym er capacitor such as os capacitor for output capacitor with simp le phase compensation. therefore, you can design lo nglife and high quality stepdown power supply circuit easily. frequency characteristics the frequency characteristic of this ic is constitu ted with the following transfer functions. (1) output resistance breeder : h r (2) voltage gain of error amplifier : g vea current gain : g mea (3) impedance of phase compensation external elemen t : z c (4) current sense loop gain : g cs (5) output smoothing impedance : z o closed loop gain is obtained with the following for mula (8). g = h r ? g mer ? z c ? g cs ? z o = v ref v out ? g mer ? r c + 1 sc c ? g cs ? r l 1 + sc o ? r l (8) frequency characteristics of the closed loop gain i s given by pole fp1 consists of output capacitor c o and output load resistance r l , zero point fz consists of external capacitor c c of the phase compensation and resistance r c , and pole fp2 consists of output impedance z er of error amplifier and external capacitor of phase compensation c c as shown in formula (8). fp1, fz, fp2 are obtained with the fol lowing equations (9) to (11). fp1 = 1 2 ? c o ? r l (9) fz = 1 2 ? c c ? r c (10) fp2 = 1 2 ? z er ? c c (11) fb v ref g ver g mer r c c c z c r l c o z o comp sw clk current sence loop h r v out v in r 2 r 1 osc 1/g cs q dc r
LV5980MC no.a210411/16 calculation of external phase compensation constant generally, to stabilize switching regulator, the fr equency where closed loop gain is 1 (zerocross fre quency f zc ) should be 1/10 of the switching frequency (or 1/5). since the switching frequency of this ic is 370khz, the z erocross frequency should be 37khz. based on the above condition, we o btain the following formula (12). v ref v out ? g mer ? r c + 1 sc c ? g cs ? r l 1 + sc o ? r l = 1 (12) as for zerocross frequency, since the impedance el ement of phase compensation is rc >> 1/sc c , the following equation (13) is obtained. v ref v out ? g mer ? r c ? g cs ? r l 1 + 2 ? f zc ? c o ? r l = 1 (13) phase compensation external resistance can be obtai ned with the following formula (14), the variation of the formula (13). since 2 ? f zc ? c o ? r l >> 1 in the equation (14), we know that the external resistance is independent of load resistance. r c = v out v ref ? 1 g mer ? 1 g cs ? 1 + 2 ? f zc ? c o ? r l r l (14) when output is 5v and load resistance is 5 (1a load), the resistances of phase compensation a re as follows. g cs = 2.7a/v, g mer = 220 a/v, f zc = 37khz r c = 5 1.235 1 220 10 6 1 2.7 1 + 2 3.14 (37 10 3 ) (30 10 6 ) 5 5 = 48.898 10 3 = 48.90 [k ] if frequency of zero point fz and pole fp1 are in t he same position, they cancel out each other. there fore, only the pole frequency remains for frequency characteristics of the closed loop gain. in other words, gain decreases at 20db/dec and pha se only rotates by 90o and this allows characterist ics where oscillation never occurs. fp1 = fz 1 2 ? c o ? r l ? 1 2 ? c o ? r c c c = r l ? c o r c ? 5 (30 10 6 ) 48.9 10 3 = 3.067 10 9 = 3.07 [nf] the above shows external compensation constant obta ined through ideal equations. in reality, we need t o define phase constant through testing to verify constant ic oper ation at all temperature range, load range and inpu t voltage range. in the evaluation board for delivery, phase compensation c onstants are defined based on the above constants. the zerocross frequency required in the actual system board, in o ther word, transient response is adjusted by extern al compensation resistance. also, if the influence of noise is sign ificant, use of external phase compensation capacit or with higher value is recommended.
LV5980MC no.a210412/16 caution in pattern design pattern design of the board affects the characteris tics of dcdc converter. this ic switches high curr ent at a high speed. therefore, if inductance element in a pattern wirin g is high, it could be the cause of noise. make sur e that the pattern of the main circuit is wide and short. (1) v in (6) (5) (3) orange : high side mosfet on red : high side mosfet off l1 d1 c3 cout cin (4) (2) v out gnd (1) pattern design of the input capacitor connect a capacitor near the ic for noise reduction between v in and the gnd. the change of current is at the large st in the pattern between an input capacitor and v in as well as between gnd and an input capacitor amon g all the main circuits. hence make sure that the pattern is as fa t and short as possible. (2) pattern design of an inductor and the output ca pacitor high electric current flows into the choke coil and the output capacitor. therefore this pattern shoul d also be as fat and short as possible. (3) pattern design with current channel into consid eration make sure that when high side mosfet is on (red arr ow) and off (orange arrow), the two current channel s runs through the same channel and an area is minimized. (4) pattern design of the capacitor between v in -pdr make sure that the pattern of the capacitor between v in and pdr is as short as possible. (5) pattern design of the small signal gnd the gnd of the small signal should be separated fro m the power gnd. (6) pattern design of the fb-out line wire the line shown in red between fb and out to th e output capacitor as near as possible. fig: fb - out line fb out
LV5980MC no.a210413/16 typical performance characteristics application curves at ta = 25 c operation waveforms (circuit from typical application, ta = 25 c, v in = 15v, v out = 5v) e f ficiency 10 20 30 40 50 60 70 80 90 20 30 40 50 60 70 80 90 20 30 40 50 60 70 80 90 100 10 20 30 40 50 60 70 80 90 100 0.1 1 2 3 5 7 10 2 3 5 7 100 2 3 5 7 1000 2 3 5 7 2 3 5 7 1 2 3 5 7 10 2 3 5 7 100 2 3 5 7 1000 2 3 5 7 2 3 5 7 10000 1 2 3 5 7 10 2 3 5 7 100 2 3 5 7 1000 2 3 5 7 2 3 5 7 1 2 3 5 7 10 2 3 5 7 100 2 3 5 7 1000 2 3 5 7 2 3 5 7 10000 load current ma e f ficiency efficiency % 0.1 load current ma efficiency efficiency % 10 100 0.1 10000 load current ma efficiency efficiency % 10 100 0.1 10000 light load mode output voltage load current ma efficiency % v out = 1.235v v out = 1.8v v out = 3.3v v out = 5v v i n = 5 v 1 5 v 1 2 v 8 v 8 v v i n = 5 v v i n = 8 v 1 5 v 1 5 v 1 2 v v i n = 5 v 1 5 v 1 2 v i out = 10ma 10 s/div i out = 10ma 10 s/div v sw 5v/div i l 0.5a/div v out 20mv/div i l 0.5a/div 8 v 1 2 v
LV5980MC no.a210414/16 i out = 2a 2 s/div i out = 2a 2 s/div v sw 5v/div i l 1a/div v out 20mv/div i l 1a/div discontinious current mode output voltage continious current mode output voltage load transient response over current protection soft start and shutdown i out = 200ma 2 s/div i out = 200ma 2 s/div v sw 5v/div i l 0.5a/div v out 20mv/div i l 0.5a/div i out = 0.5 2.5a, slew rate = 100 a 500 s/div i out = 2a 2ms/div v out 0.2v/div i out 2a/div v out 2v/div v ss/hiccup 2v/div v in 20v/div out gnd short 20ms/div v ss/hiccup 5v/div v sw 20v/div i out 5a/div v out 5v/div
LV5980MC no.a210415/16 characterization curves at ta = 25 c, v in = 15v light load mode consumption current 0 10 20 30 40 50 60 70 80 20 40 60 80 100 120 140 4.3 4.4 4.5 4.6 4.7 4.8 4.9 90 1.21 1.22 1.23 1.24 1.25 1.26 --50 --25 0 25 50 75 100 125 --25 0 25 50 75 100 125 --25 0 25 50 75 100 125 --25 0 25 50 75 100 125 --25 0 25 50 75 100 125 --25 0 25 50 75 100 125 --25 0 25 50 75 100 125 --25 0 25 50 75 100 125 150 150 temperature c internal reference v oltage internal reference voltage v --50 temperature c output on resistance output on resistance m 0 160 --50 150 temperature c current limit peak current limit peak a 4.2 5 --50 150 temperature c input current a 310 320 330 340 350 360 370 390 380 3.3 3.4 3.5 3.6 3.7 temperature c oscillatory frequency oscillatory frequency khz 300 400 --50 150 temperature c uvlo uvlo voltage v 3.2 3.8 --50 150 1.6 1.7 1.8 1.9 0.19 0.21 0.23 0.25 0.27 0.29 0.31 temperature c soft start source current soft start source current a 1.5 2 --50 150 temperature c hiccup timer discharge current hiccup timer charge current a 0.17 0.33 --50 150 uvlo release voltage uvlo lock voltage
LV5980MC ps no.a210416/16 recommended foot pattern: soic8 soldering footprint* sanyo semiconductor co.,ltd. assumes no responsibility fo r equipment failures that result from using products at values that exceed, even momentarily, rated val ues (such as maximum ratings, operating condition ranges, or other parameters) listed in products specificat ions of any and all sanyo semiconductor co.,ltd. products described or contained herein. regarding monolithic semiconductors, if you should intend to use this ic continuously under high temperature, high current, high voltage, or drastic temperature change, even if it is used within the range of absolute maximum ratings or operating conditions, there is a possibi lity of decrease reliability. please contact us for a confirmation. sanyo semiconductor co.,ltd. strives to supply high-quali ty high-reliability products, however, any and all semiconductor products fail or malfunction with some proba bility. it is possible that these probabilistic failures or malfunction could give rise to accidents or events that coul d endanger human lives, trouble that could give rise to smoke or fire, or accidents that could cause damage to othe r property. when designing equipment, adopt safety measures so that these kinds of accidents or events ca nnot occur. such measures include but are not limited to protective circuits and error prevention circui ts for safe design, redundant design, and structural design. in the event that any or all sanyo semiconductor co.,ltd. pro ducts described or contained herein are controlled under any of applicable local export control law s and regulations, such products may require the export license from the authorities concerned in ac cordance with the above law. no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, or any i nformation storage or retrieval system, or otherwise, without the prior written consent of sanyo semicond uctor co.,ltd. any and all information described or contained herein are su bject to change without notice due to product/technology improvement, etc. when designing equi pment, refer to the "delivery specification" for the sanyo semiconductor co.,ltd. product that you inten d to use. upon using the technical information or products described herein, neither warranty nor license shall be granted with regard to intellectual property rights or any other rig hts of sanyo semiconductor co.,ltd. or any third party. sanyo semiconductor co.,ltd. shall not be liable for any claim or suits with regard to a third party's intellectual property rights which has resulted from the us e of the technical information and products mentioned above. this catalog provides information as of september, 2012. specifications and information herein are sub ject to change without notice. 1.270 0.050 0.6 0.024 4.0 0.155 7.0 0.275 1.52 0.060 scale 6:1 mm inches ( ( *for additional information on our pd-free strategy and soldering details, please download the on semiconductor solde ring and mounting techniques reference manual, solderrm/d.

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