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nju7680 - 1 - ver.2010-03-31 2ch switching regulator ic general description package outline features step-down, step-up/sepic circuit pwm switching control operating voltage 2.3v to 7v wide oscillator range 300khz to 1mhz soft-start function internal: 4ms typ. or adjustable channel on/off function standby quiescent current 1 a max. dead time control timer latch for short circuit protection c-mos technology package outline nju7680v : ssop16 NJU7680SED : pcsp24-ed (u.d.) the nju7680 is a high-speed low voltage operation switching regulator control ic. it features a to tem pole driver that can directly drive an external mos-fet. each channel has an on/off switch. therefore, the power sequence can be activated externally. internal soft-start function, dead time control and timer latch function are included, and those functions can be easily controlled by external component. nju7680v NJU7680SED ( u.d. )
nju7680 - 2 - ver.2010-03-31 pin configuration

(*1) the pad is not connected to an ic chip electrically. (top view) nju7680v 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 pin function 1. scp 9. out1 2. ce1 10. dtc1 3. ce2 11. gnd 4. fb2 12. gnd 5. in-2 13. rt 6. v + 14. vreg 7. dtc2 15. in-1 8. out2 16. fb1 (top view) (bottom view) NJU7680SED (u.d.) pin function 1. n.c. 13. dtc1 2. fb2 14. gnd 3. in-2 15. gnd 4. n.c. 16. rt 5. v + 17. vreg 6. n.c. 18. n.c. 7. dtc2 19. in-1 8. n.c. 20. fb1 9. out2 21. n.c. 10. n.c. 22. scp 11. out1 23. ce1 12. n.c. 24. ce2 1 2 3 4 5 6 18 17 16 15 14 13 7 8 9 10 11 12 19 20 21 22 23 24 pad (*1) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 pad (*1) pad (*1) pad (*1)
nju7680 - 3 - ver.2010-03-31 block diagram 0.5v osc 2 ? amp1 regulator 2v dtc_comp1 buffer1 sst1 v + vreg scp scp on/off ce2 ce1 rt_on dtc1 out2 in-2 fb2 pwm2 er ? amp2 dtc_comp2 buffer2 sst2 dtc2 rt_on sw ch1 ch2 v + 2k ? ? on/off function the on/off switch for each channel is controlled by ce pin. setting the ce low will turn off all applicable channels? circuit. turning off both channels will turn off all circuit. opening the rt pin will turn off all circui t regardless of input signals from ce pin. input signal operating state rt ce1 ce2 ch1 ch2 h h h on on h h l on off h l h off on h l l l h h l h l l l h l l l off standby mode
nju7680 - 4 - ver.2010-03-31 ? soft start feature (soft start) the soft-start is internally set for 4ms typ. to adjust the ti me, insert resistance or connect capacitor to the dtc pin. ? max duty max duty is set 90% for ch1 (step-up) and 100% for ch2 (step-down). max duty can be adjusted by connecting the verg pin to the dtc pin. when not limiting max duty, short the dtc pin to the vreg terminal. ? short circuit protection the short circuit protection block employs time latch, and protection delay time can be adjusted by a capacitor connected to scp pin. the program of timer latch circuit c an be reset by restarting the power (supply voltage must be lower than uvlo sensing voltage), setting ic to standby status, or lowering scp pin to gnd level. absolute maximum ratings (ta=25c) parameter symbol maximum ratings unit supply voltage v + +8 v output pin current i o 50 ma ce1 pin voltage v ce1 +8 (*2) v ce2 pin voltage v ce2 +8 (*2) v power dissipation p d ssop16 pcsp24-ed : 300 : 475 (*3) mw operating temperature range t opr -40 ~ +85 c storage temperature range t stg -40 ~ +125 c (*2): when input voltage is less than 8v, the absolute ma ximum control voltage is equal to the input voltage. (*3): mounted on glass epoxy board based on eia/jedec. (114.3 76.2 1.6mm: 2layers) recommended operating conditions (ta=25c) parameter symbol min. typ. max. unit operating voltage v + 2.3 ? 7 v oscillator timing resistor r t 30 47 120 k ? oscillation frequency f osc 300 700 1,000 khz
nju7680 - 5 - ver.2010-03-31 electrical characteristics (v + =v ce1 =v ce2 =3.3v, r t =47k ? , ta=25c) parameter symbol test condi tion min. typ. max. unit voltage regulator block regulator output voltage v reg 1.97 2.0 2.03 v line regulation v reg_line v + =2.2 7v ? 5 15 mv load regulation v reg_load i reg =0 2ma -10 -1 ? mv maximum output current i reg_max v reg =1.9v 4 ? ? ma temp fluctuations v reg_tc1 ta=-40 +85 c ? 0.5 ? % under voltage lockout block on threshold voltage v t_on v + = l h 2.1 2.2 2.3 v off threshold voltage v t_off v + = h l 2.0 2.1 2.2 v hysteresis voltage v hys 60 100 ? mv regulator output detection on threshold voltage v t_on_reg v reg = l h 1.6 1.7 1.8 v regulator output detection off threshold voltage v t_off_reg v reg = h l 1.5 1.6 1.7 v regulator output detection hysteresis voltage v hys_reg 60 100 ? mv short circuit protection block input threshold voltage 1 v t_pc1 fb1 pin 0.95 1.00 1.05 v input threshold voltage 2 v t_pc2 fb2 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 0.90 1.00 1.10 v latch mode off threshold voltage v t_laoff scp pin 0.35 0.6 0.85 v soft start block soft start time 1 t ss1 v t_on duty1=80% 3 4 6 ms soft start time 2 t ss2 v t_on duty2=80% 3 4 6 ms 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 + =2.2 ~ 7v ? 1 ? % oscillate temperature fluctuations f dt ta = - 4 0 c ~ +85 c ? 3 ? % standby rt terminal resistance r t_stb ? 2 ? m ?
nju7680 - 6 - ver.2010-03-31 electrical characteristics (v + =v ce1 =v ce2 =3.3v, r t =47k ? , ta=25c) parameter symbol test condi tion min. typ. max. unit error amplifier block reference voltage 1 v b1 -1.5% 1.00 +1.5% v reference voltage 2 v b2 -1.5% 1.00 +1.5% v input bias current 1 i b1 -0.1 ? 0.1 a input bias current 2 i b2 -0.1 ? 0.1 a open loop gain a v ? 80 ? db gain bandwidth product g b ? 1 ? mhz output source current 1 i om+1 v fb1 =1v, v in-1 =0.9v 17 32 47 a output source current 2 i om+2 v fb2 =1v, v in-2 =0.9v 17 32 47 a output sink current 1 i om-1 v fb1 =1v, v in-1 =1.1v 0.5 2.5 5.0 ma output sink current 2 i om-2 v fb2 =1v, v in-2 =1.1v 0.5 2.5 5.0 ma pwm comparate block v t_0_1 duty1=0% 0.15 0.22 0.29 v input threshold voltage 1 v t_50_1 duty1=50% 0.46 0.53 0.60 v v t_0_2 duty2=0% 0.15 0.22 0.29 v input threshold voltage 2 v t_50_2 duty2=50% 0.46 0.53 0.60 v m ax d uty11 v fb1 =0.9v 85 90 95 % maximum duty cycle 1 (*4) m ax d uty12 v fb1 =0.9v, v dtc1 =0.53v 40 50 60 % m ax d uty21 v fb2 =0.9v 100 ? ? % maximum duty cycle 2 (*4) m ax d uty22 v fb2 =0.9v, v dtc2 =0.53v 40 50 60 % output block output high level on resistance 1 r oh1 i out1 =-20ma ? 5 10 ? output high level on resistance 2 r oh2 i out2 =-20ma ? 5 10 ? output low level on resistance 1 r ol1 i out1 =+20ma ? 5 10 ? output low level on resistance 2 r ol2 i out2 =+20ma ? 5 10 ? on/off block on control voltage 1 v on1 ce1= l h 1.2 ? v + v off control voltage 1 v off1 ce1= h l ? ? 0.6 v on control voltage 2 v on2 ce2= l h 1.2 ? v + v off control voltage 2 v off2 ce2= h l ? ? 0.6 v general characteristics quiescent current 1 i dd1 r l =non load ? 1 1.6 ma quiescent current 2 i dd2 per channel on ? 0.7 1.2 ma standby current 1 i dd stb1 v ce1 =v ce2 =0v ? ? 3.0 a standby current 2 i dd stb2 rt=open ? ? 1.0 a
nju7680 - 7 - ver.2010-03-31 (*4) : ch1 is a step-up converter that is intended to drive nch mo sfet. out1 terminal output as high levels is defined as the maximum duty cycle. ch2 is a step-down converter that is in tended to drive pch mosfet. out2 terminal output as low level is defined as the maximum duty cycle. typical applications gnd v out1 v out2 v + fb1 scp in-2 fb2 v + dtc2 rt gnd out2 ce2 ce1 in-1 vreg gnd dtc1 out1 nju7680 0.1 f c scp = 0.1 f c reg =0.1 f r t =47k ?
nju7680 - 8 - ver.2010-03-31 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 02468 oscillation frequency fosc (khz) operating voltage v + (v) oscillation frequency vs. operating voltage (r t =47k ? , ta=25 o c) 0.99 0.995 1 1.005 1.01 1.015 1.02 02468 reference voltage v b (v) operating voltage v + (v) reference voltage vs. operating voltage (ta=25 o c) v b2 v b1 -30 -20 -10 0 10 02468 output voltage ? v reg (v) output current i reg (ma) voltage regulator block load regulation (ta=25 o c) v + =2.3v v + =3.3v v + =7.0v 0 500 1000 1500 2000 02468 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) i dd1 i dd2 0 0.5 1 1.5 2 2.5 3 02468 standby current i dd_stb ( a) operating voltage v + (v) standby current vs. operating voltage (ta=25 o c) i dd_stb2 i dd_stb1
nju7680 - 9 - ver.2010-03-31 typical characteristics 0 20 40 60 80 100 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 duty cycle1 m ax d uty_1 (%) dtc1 pin voltage v dtc1 (v) duty cycle1 vs. dtc1 pin voltage (ch1, v + =3.3v, ta=25 o c) for f osc = 300khz, 500khz, 700khz, 1mhz 0 20 40 60 80 100 200 400 600 800 1000 duty cycle1 m ax d uty_1 (%) oscillator frequency f osc (khz) duty cycle1 vs. oscillator frequency (ch1, v + =3.3v, ta=25 o c) v dtc1 =0.3v v dtc1 =0.8v v dtc1 =1.0v 0.05v step 0 20 40 60 80 100 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 duty cycle2 m ax d uty_2 (%) dtc2 pin voltage v dtc2 (v) duty cycle2 vs. dtc2 pin voltage (ch2, v + =3.3v, ta=25 o c) for f osc = 300khz, 500khz, 700khz, 1mhz 0 20 40 60 80 100 200 400 600 800 1000 duty cycle2 m ax d uty_2 (%) oscillator frequency f osc (khz) duty cycle2 vs. oscillator frequency (ch2, v + =3.3v, ta=25 o c) v dtc2 =0.3v v dtc2 =0.85v 0.05v step (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
nju7680 - 10 - ver.2010-03-31 typical characteristics 0 5 10 15 20 -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 + =2.3v v + =3.3v v + =7v 0 5 10 15 20 -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 + =2.3v v + =3.3v v + =7v 2 2.5 3 3.5 4 4.5 5 5.5 6 -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) 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 ? ) 0.985 0.99 0.995 1 1.005 1.01 1.015 -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) 1.96 1.97 1.98 1.99 2 2.01 2.02 2.03 2.04 -50-25 0 255075100125 ambient temperature ta ( o c) regulator output voltage v reg (v) voltage regulator block output voltage vs. temperature (v + =3.3v, i reg =0ma)
nju7680 - 11 - ver.2010-03-31 typical characteristics 0 0.5 1 1.5 2 -50-25 0 255075100125 ambient temperature ta ( o c) quiescent current i dd (ma) quiescent current vs. temperature (v + =3.3v, r t =47k ? ) i dd1 i dd2 0 0.5 1 1.5 2 2.5 3 -50-25 0 255075100125 ambient temperature ta ( o c) standby current i dd_stb ( a) standby current vs. temperature (v + =3.3v, r t =47k ? ) i dd_stb1 i dd_stb2 i dd_stb1 : v ce1 =v ce2 =0v i dd_stb2 : rt=open 1.4 1.6 1.8 2 2.2 2.4 -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 v t_off_reg v t_on_reg [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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