NJU7632 -1- ver.2006-07-12 step-down switching regulator ic with standby function general description package outline features product variation pwm switching control standby function operating voltage 2.2v to 8v wide oscillator range 300khz to 1mhz maximum duty cycle 100% quiescent current operating :800 a typ. standby :1 a max. soft-start function internal :16ms typ. or adjustable dead time control timer latch for short circuit protection c-mos technology ** planning package outline NJU7632rb1 : tvsp8 pin configuration NJU7632 is a high speed low voltage operation switching regulator control ic. it features a totem pole driver that can directly drive an external mos-fet. internal soft-start function, dead time control and timer latch function are included, requiring no external components. all parameters can be optimized by additional external components for design flexibility. the standby function realizes low power consumption at the time of standby. NJU7632rb1 pin function 1. out 2. v + 3. fb 4. in- 5. scp 6. dtc 7. rt 8. gnd NJU7632rb1 1 8 2 7 3 6 4 5 NJU7632 nju763x** nju7630 standby function standby terminal pwm control
NJU7632 - 2 - ver.2006-07-12 block diagram buffer 0.5v osc 1v 0.5 r t a 2k ? 2 ? amp latch standby on/off rt r t r p v + on/off high: on low : off (standby)
NJU7632 - 3 - ver.2006-07-12 absolute maximum ratings (ta=25c) parameter symbol maximum ratings unit supply voltage v + +9 v output pin current i o 50 ma power dissipation p d tvsp8 :320 mw operating temperature range t opr -40 ~ +85 c storage temperature range t stg -40 ~ +125 c recommended operating conditions (ta=25c) parameter symbol min. typ. max. unit operating voltage v + 2.2 ? 8 v oscillator timing resistor r t 30 47 120 k ? oscillation frequency f osc 300 700 1,000 khz electrical characteristics (v + =3.3v, r t =47k ? , ta=25c) parameter symbol test condition min. typ. max. unit under voltage lockout block on threshold voltage v t_on v + = l h 1.9 2.0 2.1 v off threshold voltage v t_off v + = h l 1.8 1.9 2.0 v hysteresis voltage v hys 60 100 ? mv soft start block soft start time t ss v t_on duty=80% 8 16 24 ms short circuit protection block input threshold voltage v t_pc fb pin 0.95 1.00 1.05 v charge current i chg v scp =0v 1.5 2 2.5 a latch mode on threshold voltage v t_la scp pin 0.95 1.00 1.05 v latch mode off threshold voltage v t_laoff scp pin 0.2 0.45 0.7 v oscillator block rt pin voltage v rt -5% 0.5 +5% v oscillation frequency f osc 630 700 770 khz oscillate supply voltage fluctuations f dv v + =2.2v ~ 8v ? 1 ? % oscillate temperature fluctuations f dt ta = - 4 0 c ~ +85 c ? 3 ? % standby rt terminal resistance r t_stb ? 2 ? m ?
NJU7632 - 4 - ver.2006-07-12 electrical characteristics (v + =3.3v, r t =47k ? , ta=25c) parameter symbol test condition min. typ. max. unit error amplifier block reference voltage v b -1.0% 1.00 +1.0% v input bias current i b -0.1 ? 0.1 a open loop gain a v ? 80 ? db gain bandwidth product g b ? 1 ? mhz i om+_1 v fb =1v, v in- =0.9v 20 45 70 ma output source current i om+_2 v fb =1v, v in- =0.9v, v + =2.2v 4 9 16 ma output sink current i om- v fb =1v, v in- =1.1v 0.10 0.16 0.22 ma pwm complete block v t_0 duty=0% 0.16 0.22 0.28 v input threshold voltage v t_50 duty=50% 0.44 0.5 0.56 v m ax d uty_1 v fb =0.9v 100 ? ? % maximum duty cycle m ax d uty_2 v fb =0.9v, r dtc =47k ? 40 50 60 % output block output high level on resistance r oh i o =-20ma ? 10 20 ? output low level on resistance r ol i o =+20ma ? 5 10 ? general characteristics quiescent current i dd r l =non load ? 800 1200 a standby quiescent current i dd_stb r t =open ? ? 1.0 a
NJU7632 - 5 - ver.2006-07-12 typical applications step-down converter scp v in v out c scp 1 fet sbd 2 3 4 5 6 7 8 r dtc c s in- fb v + dtc rt gnd out r t c out c in r2 r1 c nf r nf c l NJU7632 on/off high: on low : off (standby) r p
NJU7632 - 6 - ver.2006-07-12 typical characteristics 100 1000 10 100 oscillation frequency f osc (khz) oscillation frequency vs. timing resistance (v + =3.3v, ta=25 o c) timing resistance r t (k ? ) 660 680 700 720 740 0246810 oscillation frequency fosc (khz) operating voltage v + (v) oscillation frequency vs. operating voltage (r t =47k ? , ta=25 o c) 0 20 40 60 80 100 0 20406080100 duty cycle m ax d uty (%) dead time control resistance r dtc (k ? ) duty cycle vs. r dtc (v + =3.3v, r t =47k ? , ta=25 o c) 0.996 0.998 1 1.002 1.004 0246810 reference voltage v b (v) operating voltage v + (v) reference voltage vs. operating voltage (ta=25 o c) (v + =3.3v, gain=40db, ta=25 o c) 0 15 30 45 60 0 45 90 135 180 0.1 1 10 100 1000 10000 error amplifier block voltage gain, phase vs. frequency phase (deg) frequency f (khz) voltage gain av (db) phase gain
NJU7632 -7- ver.2006-07-12 typical characteristics 0 200 400 600 800 1000 1200 1400 0246810 quiescent current i dd ( a) operating voltage v + (v) quiescent current vs. operating voltage (r t =47k ? , r l =non load, ta=25 o c) 0 0.2 0.4 0.6 0.8 1 0246810 standby current i dd_stb (na) operating voltage v + (v) standby current vs. operating voltage (r t =open, ta=25 o c) 0 2 4 6 8 10 12 14 16 -50 -25 0 25 50 75 100 125 ambient temperature ta ( o c) output high level on resistance r oh ( ? ) output block output high level on resistance vs. temperature (io=-20ma) v + =3.3v v + =1.95v v + =8v 0 2 4 6 8 10 12 14 -50 -25 0 25 50 75 100 125 ambient temperature ta ( o c) output low level on resistance r ol ( ? ) output block output low level on resistance vs. temperature (io=+20ma) v + =3.3v v + =1.95v v + =8v 1 10 100 1000 -50 -25 0 25 50 75 100 125 ambient temperature ta ( o c) output source current i om+ (ma) error amplifier block output source current vs. temperature (v fb =1v, v in- =0.9v) v + =3.3v v + =1.95v v + =8v 0 0.05 0.1 0.15 0.2 -50 -25 0 25 50 75 100 125 ambient temperature ta ( o c) output sink current i om- (ma) error amplifier block output sink current vs. temperature (v fb =1v, v in- =1.1v) v + =1.95v, 3.3v, 8v
NJU7632 - 8 - ver.2006-07-12 typical characteristics 8 10 12 14 16 18 20 22 24 -50 -25 0 25 50 75 100 125 ambient temperature ta ( o c) soft start time tss (ms) soft start time vs. temperature (v + =3.3v) 0.99 0.995 1 1.005 1.01 -50 -25 0 25 50 75 100 125 ambient temperature ta ( o c) reference voltage v b (v) reference voltage vs. temperature (v + =3.3v) 640 660 680 700 720 740 760 -50 -25 0 25 50 75 100 125 ambient temperature ta ( o c) oscillator frequency f osc (khz) oscillator frequency vs. temperature (v + =3.3v, r t =47k ? ) 1.86 1.9 1.94 1.98 2.02 2.06 -50 -25 0 25 50 75 100 125 ambient temperature ta ( o c) threshold voltage (v) under voltage lockout block vs. temperature v t_off v t_on 0 200 400 600 800 1000 -50 -25 0 25 50 75 100 125 ambient temperature ta ( o c) quiescent current i dd ( a) quiescent current vs. temperature (v + =3.3v, r t =47k ? ) 0 0.2 0.4 0.6 0.8 1 -50 -25 0 25 50 75 100 125 ambient temperature ta ( o c) standby current i dd_stb ( a) standby current vs. temperature (v + =3.3v, r t =open)
NJU7632 - 9 - ver.2006-07-12 memo [caution] the specifications on this databook are only given for information , without any guarantee as regards either mistakes or omissions. the application circuits in this databook are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights. [caution] the specifications on this databook are only given for information , without any guarantee as regards either mistakes or omissions. the application circuits in this databook are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights.
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