View LV5980MX_5897447.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

o1211 sy pc 20110912-s00011 no.a1980-1/16 specifications of any and all sanyo semiconductor co.,ltd. products described or contained herein stipulate the performance, characteristics, and functions of the described products in the independent state, and are not guarantees of the performance, characteristics, and functions of the described products as mounted in the customer ' s products or equipment. to verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer ' s products or equipment. any and all sanyo semiconductor co.,ltd. products described or contained herein are, with regard to "standard application", intended for the use as general electronics 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 appli ances, transportation machine, traffic signal system, safety equipment etc.) that shall require extremely high level of reliab ility and can directly threaten human lives in case of failure or malfunction of the product or may cause harm to human bodies, nor shall they grant any guarantee thereof. if you should intend to use our products for new introduction or other application different from current conditions on the usage of automotive device, communication device, office equipment, industrial equipment etc. , please consult with us about usage condition (temperature, operation time etc.) prior to the intended use. if there is no consultation or inquiry before the intended use, our customer shall be solely responsible for the use. LV5980MX overview LV5980MX is 1ch dc-dc converter with built-in power pc h mosfet. the recommended op erating range is 4.5v to 23v. the maximum current is 3a. the operating current is about 60 a, and low power consumption is achieved. features and functions ? 1ch sbd rectification dc-dc converter ic with built-in power pch mosfet ? typical value of light load mode current is 60 a ? 4.5v to 23v operating input voltage range ? 100m high-side switch ? output voltage adjustable to 1.235v ? the oscillatory frequency is 370khz ? built-in ocp circuit with p-by-p method ? when p-by-p is generated continuo usly, it shifts to the hiccup operation ? if connect c-hiccup to gnd pin, then latch-off when over current ? external capacitor soft-start ? under voltage lock-out, thermal shutdown and power good indication applications ? dvd/blu-ray ? drivers and hdd ? lcd monitors and tvs ? point of load dc/dc converters ? office supplies application circuit example bi-cmos ic low power consumption and high efficiency step-down switching regulator orderin g numbe r : ena1980 in gnd v in LV5980MX por c1: grm31cb31e106k [murata] c3: c2102jb0j106m [tdk] l1: c6-k5lga [mitsumi] d1: sbm30-03 [sanyo] en sw fb pg ref comp ss c-hiccup c1 c3 10 f 2 10 f 3 l1 10 h 1 f c7 r1 d1 r3 5v out c2 r2 47k 1 f c6 4.7nf c5 2.2nf c4 22nf 15v 40 50 60 70 80 90 1 23 57 10 23 57 100 23 57 1000 2 3 57 2 3 57 load current -- ma efficiency efficiency -- % 30 100 0.1 10000 v in = 15v, v out = 5v
LV5980MX no.a1980-2/16 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 en v in v pg v in v v in -pdr 6v ref 6v ss ref v fb ref v comp ref v c-hiccup ref v allowable power dissipation pd max specified substrate *1 1.05 w operating temperature topr -40 to +85 c storage temperature tstg -55 to +150 c *1 specified substrate : 40.0mm 30.0mm 1.6mm, fiberglass epoxy printed circuit board, 2 layers note 1 : absolute maximum ratings represent the values which cannot be exceeded for any length of time. note 2 : even when the device is used within the range of absolute maximum ratings, as a result of continuous usage under high temperature, high current, high voltage, or drastic temperature change, the reliability of th e ic may be degraded. please contact us for the further deta ils. 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, unless otherwise specified. 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 on/off circuit ic startup voltage (en pin) v cnt _on 2.0 v in v disable voltage (en pin) v cnt _off 0.3 v soft start circuit soft start ? source current i ss _sc en > 2v 1.2 1.8 2.4 a soft start ? sink current i ss _sk en < 0.3v, ss = 0.4v 220 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 1.19 1.25 1.31 v hiccup timer charge current i hic 1.8 a pwm comparator maximum on-duty d max 94 % continued on next page.
LV5980MX no.a1980-3/16 continued from preceding page. parameter symbol conditions ratings unit min typ max logic output power good ?l? sink current i pwrgd _l pg = 0.5v 0.47 ma power good ?h? leakage current i pwrgd _h pg = 5v 1 a power good threshold fb voltage v tpg 0.97 1.07 1.17 v power good hysteresis v pg _h 40 50 60 mv output output on resistance r on i o = 0.5a 100 m the entire device standby current i ccs en < 0.3v 1 a light load mode co nsumption current i sleep en > 2v, no oscillatory 60 80 a thermal shutdown tsd design guarantee *2 170 c *2 : design guarantee: signifies target value in desi gn. these parameters are not tested in an independent ic.
LV5980MX no.a1980-4/16 package dimensions unit : mm (typ) 3414 specified substrate top bottom pin assignment sanyo : mfp12sj(200mil) 5.0 4.4 6.0 12 12 0.15 0.05 0.43 0.3 0.8 (0.5) 1.7 max (1.5) 0 1.0 0.5 1.5 80 0.55 1.05 60 20 40 0 100 --40 --20 ambient temperature, ta -- c allowable power dissipation, pd max -- w pd max ? ta 1 sw 2 pdr 3 gnd 4 nc 5 c-hiccup 6 ss 12 v in 11 en 10 pg 9 ref 8fb 7 comp LV5980MX mfp12sj top view
LV5980MX no.a1980-5/16 block diagram wake-up en level-shift tsd uvlo.comp hiccup.comp pwm comp pbyp.comp band-gap bias 1.235v 15pluse counter osc s r ck q ref pch drive lnit.comp slope clk gnd pdr pg.comp 1.07v error.amp enable enable v in c-hiccup comp ss fb pg sw ref pdr gnd q
LV5980MX no.a1980-6/16 pin function pin no. pin name function equivalent circuit 1 sw high-side pch mosfet drain pin. v in sw 22m 2 pdr pch mosfet gate drive voltage. the bypass capacitor is necessarily connected between this pin and v in . v in gnd pdr 1.5m 1.3m 10k 10k 10 3 gnd ground pin. ground pin voltage is reference voltage v in gnd 4 nc nc pin. the nc pin becomes open in an ic. therefore the nc pin has any problem by neither the grand short nor the open. 5 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 c-hiccup gnd 1k 6 ss capacitor connection pin for soft start. about 1.8 a current charges the soft start capacitor. v in ss gnd 10k 1k 1k continued on next page.
LV5980MX no.a1980-7/16 continued from preceding page. pin no. pin name function equivalent circuit 7 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 amplitude. comp pin is connected internally to an init.comparator which comparates 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 comp gnd 1k 1k 70k 8 fb error amplifier reverse input pin. ics make its voltage keep 1.235v. output voltage is divided by external resistances and it across fb. v in fb gnd 10k 1k 1k 9 ref reference voltage. v in ref gnd 10 10 51k 1m 450k 10 pg power good pin. connect to open drain of mos-fet in ics inside. setting output voltage to "l", when fb voltage is 1.02v or less. gnd pg 1k 11 en on/off pin. 4.8m gnd en v in 12 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
LV5980MX no.a1980-8/16 detailed description power-save feature the LV5980MX has power-saving feature to e nhance efficiency when the load is light. by shutting down unnecessary circuits, ope rating current 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 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) power good fb constantly monitors v out . when fb voltage is lower than 1.02v, pg is pulled down to low. pg comparator has hysteresis of 50mv. because pg is open-d rain output, you can connect other ics w ith pg to realize wi red-or with other ics. hiccup over current protection over current 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 external capacitor of the c-hiccup. when c-hiccup is about 1.25v, the ic starts up. regardless of a status; whether it starts up or ss charge, once over current is detected , the ic stops again and when the protectio n does not detect over current status, the ic starts up again. the setting value of t hic is given by the equation (3). t hic = c4 v thic i hic = c4 1.25 1.8 10 -6 [s] (3) i cl il c-hiccup ss 1.25v fb=1.02v t hic fb pg the ic stops when the peak val ue of inductor current is higher than overcurrent limit for 15 consecutive times. * the stop time defined by external capacitor of c-hiccup the ic starts up when c-hiccup is 1.25v ? the ic stops when overcurrent is detected. ? the ic starts up again if no overcurrent is detected. * fb 1.07v ? high
LV5980MX no.a1980-9/16 design procedure inductor selection when conditions for input voltage, output voltage and ripple current are defined, the following equations (4) give inductance value. l = v in - v out i r t on (4) 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 (5). i rp = i out + v in - v out 2l t on (5) make sure that rating current value of the inductor is higher than a peak value of ripple current. ? inductor current: ripple current ( ? i r ) ripple current ( ? i r ) is given by the equation (6). i r = v in - v out l t on (6) when load current (i out ) is less than 1/2 of the ripple curren t, inductor current flows discontinuously. output capacitor selection make sure to use a capacitor with low impedance for switc hing power supply because of large ripple current flows through output capacitor. this ic is a switching regulator which adopts current mode control method. therefore, you can use capacitor such as ceramic capacitor and os capacitor in which equivalent series resistance (esr) is exceedingly small. effective value is given by the equation (7) because the ripp le current (ac) that flows th rough output capacitor is saw tooth wave. i c_out = 1 2 3 v out (v in - v out ) l f osc v in [arms] (7) 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 ripple current value. the effective value of the ripple current flows through input capacitor is given by the equation (8). i c_in = d (1 - d) i out [arms] (8) d = t on t = v out v in in (8), 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 allowable ripple current value given by (8). with (8), 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 keep impedance low because of the current fluctuation. make sure to connect input cap acitor near output capacitor to lower 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 input capacitor is small, input voltage increas es. therefore, you need to implement a large input capacitor. regeneration power changes according to the change of ou tput voltage, inductance of a coil and load current.
LV5980MX no.a1980-10/16 selection of external phase compensation component this ic adopts current mode control which allows use of ceramic capacitor with low es r and solid polymer capacitor such as os capacitor for output capacitor with simple phase compensation. therefore, you can design long-life and high quality step-down power supply circuit easily. frequency characteristics the frequency characteristic of this ic is c onstituted 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 comp ensation external element : z c (4) current sense loop gain : g cs (5) output smoothing impedance : z o closed loop gain is obtained with the following formula (9). 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 (9) frequency characteristics of the closed loop gain is 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 compensa tion 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 (9). fp1, fz, fp2 are obtained with the following equations (10) to (12). fp1 = 1 2 ? c o ? r l (10) fz = 1 2 ? c c ? r c (11) fp2 = 1 2 ? z er ? c c (12) 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 d c r
LV5980MX no.a1980-11/16 calculation of external phase compensation constant generally, to stabilize switching regula tor, the frequency where closed loop gain is 1 (zero-cross frequency f zc ) should be 1/10 of the switching frequency (or 1/5). since the switching frequency of this ic is 370khz, the zero-cross frequency should be 37khz. based on the above condition, we obtain the following formula (13). v ref v out ? g mer ? r c + 1 sc c ? g cs ? r l 1 + sc o ? r l = 1 (13) as for zero-cross frequency, since the impe dance element of phase compensation is rc >> 1/sc c , the following equation (14) is obtained. v ref v out ? g mer ? r c ? g cs ? r l 1 + 2 ? f zc ? c o ? r l = 1 (14) phase compensation external resistance can be obtained with the following formula (15), the variation of the formula (14). since 2 ? f zc ? c o ? r l >> 1 in the equation (15), we know that the extern al 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 (15) when output is 5v and load resistance is 5 (1a load), the resistances of pha se compensation are 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 the same position, they cancel out each other. therefore, only the pole frequency remains for frequency characteristics of the closed loop gain. in other words, gain decreases at -20db/dec and phase only ro tates by 90o and this allows characteristics 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 obtained through ideal equations. in reality, we need to define phase constant through testing to verify constant ic operation at all temperature range, load range and input voltage range. in the evaluation board for delivery, phase compensation constants are defined based on the above constants. the zero-cross frequency required in the actual system board, in other word, transient response is adjust ed by external compensation resistance. also, if the influence of noise is significant, use of external phase co mpensation capacitor with higher value is recommended.
LV5980MX no.a1980-12/16 caution in pattern design pattern design of the board affects the char acteristics of dc-dc converter. this ic switches high current at a high speed. therefore, if inductance element in a pattern wiring is high, it c ould be the cause of noise. make sure that the pattern of the main circuit is wide and short. (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 largest in the pattern between an input capacitor and v in as well as between gnd and an in put capacitor among all the main circuits. hence make sure that the pattern is as fat and short as possible. (2) pattern design of an inductor and the output capacitor high electric current flows into the choke coil and the output capacitor. therefore this pattern should also be as fat and short as possible. (3) pattern design with current channel into consideration make sure that when high side mosfet is on (red arro w) and off (orange arrow), the two current channels 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 snubber circuit locate a snubber circuit in parallel with the schottky barrier diode. (6) pattern design of the small signal gnd the gnd of the small signal should be separated from the power gnd. (7) pattern design of the fb-out line wire the line shown in red between fb and ou t to the output capacitor as near as possible. red : high side mosfet on orange : high side mosfet off (1) (3) (2) (7) (5) (6) (4) fig: fb-out line fb out
LV5980MX no.a1980-13/16 typical performance characteristics application curves at ta = 25 c wake up sequence (circuit from typical application, ta = 25 c, v in = 15v, v out = 5v) efficiency 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 23 57 10 23 57 100 23 57 1000 23 57 23 57 1 23 57 10 23 57 100 23 57 1000 23 57 23 57 10000 1 23 57 10 23 57 100 23 57 1000 23 57 23 57 1 23 57 10 23 57 100 23 57 1000 23 57 23 57 10000 load current -- ma efficiency efficiency -- % 0.1 load current -- ma efficiency efficiency -- % 10 100 0.1 10000 load current -- ma efficiency efficiency -- % 10 100 0.1 10000 operate waveform output waveform load current -- ma efficiency -- % v out = 1.235v v out = 1.8v v out = 3.3v v out = 5v v i n = 5 v v i n = 1 2 v 1 5 v 1 2 v v i n = 5 v 1 5 v 1 5 v 1 2 v v i n = 5 v 1 5 v 1 2 v i out = 10ma 5 s/div i out = 10ma 5 s/div v sw 5v/div i l 0.5a/div v out 20mv/div i l 0.5a/div
LV5980MX no.a1980-14/16 operate waveform output waveform i out = 2a 2 s/div i out = 2a 2 s/div v sw 5v/div i l 0.5a/div v out 20mv/div i l 0.5a/div operate waveform output waveform 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 load transient response soft start & shutdown i out = 0.5 ? 2.5a, slew rate = 20 a 500 s/div i out = 2a 2ms/div v out 0.2v/div i out 2a/div v out 5v/div v ss 5v/div v en 2v/div v pg 10v/div hiccup operating waveform out - gnd short 10ms/div v ss 5v/div v hiccup 1v/div i out 5a/div v out 5v/div
LV5980MX no.a1980-15/16 characterization curves at ta = 25 c, v in = 15v no load supply 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 voltage 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 0.24 0.26 0.28 0.3 temperature -- c oscillatory frequency oscillatory frequency -- khz 300 400 --50 150 temperature -- c uvlo hysteresis voltage uvlo hysteresis voltage -- v 0.22 0.32 --50 150 1.6 1.7 1.8 1.9 1.6 1.7 1.8 1.9 temperature -- c soft start source current soft start source current -- a 1.5 2 --50 150 temperature -- c hiccup timer charge current hiccup timer charge current -- a 1.5 2 --50 150
LV5980MX ps no.a1980-16/16 sanyo semiconductor co.,ltd. assumes no responsib ility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all sanyo semiconductor co.,ltd. products described or contained herein. sanyo semiconductor co.,ltd. strives to supply high-quality high-reliab ility pr oducts, however, any and all semiconductor products fail or malfunction with some probab ility. it is possible that these pr obab ilistic failures or malfunction could give rise to accidents or events that could endanger human lives, trouble that could give rise to smoke or fire, or accidents that could cause dam age to other property. when designing equipment, adopt safety measures so that these kinds of accidents or events cannot occur. such measures include but are not limited to protective circuits and error prevention circuits for safe design, redundant design, and structural design. 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 rights 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 intellctual property rights which has resulted from the use of the technical information and products mentioned above. any and all information described or contained herein are subject to change without notice due to product/technology improvement, etc. when designing equip ment, refer to the "delivery specification" for the sanyo semiconductor co.,ltd. product that you intend to use. in the event that any or all sanyo semiconductor co.,ltd. products described or contained herein are controlled under any of applicable local export control laws and regulations, such products may require the export license from the authorities concerned in accordance 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 information storage or retrieval system, or otherwise, without the prior written consent of sanyo semiconductor co.,ltd. this catalog provides information as of october, 2011. specificati ons and information herein are subject to change without notice. en current 0 1 2 3 4 1.04 1.05 1.06 1.07 1.08 1.09 5 0.8 1 1.2 1.4 1.6 1.8 2 --50 --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 ic startup en voltage en voltage -- v --50 temperature -- c power good threshold fb voltage power good threshold voltage -- v 1.03 1.1 --50 150 temperature -- c en current -- a

▲Up To Search▲

Price & Availability of LV5980MX

	To Download LV5980MX Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .