NJW4158 - 1 - ver.2012-08-06 switching regulator ic for buck converter current mode control w/ 40v/8a mosfet general description package outline features current mode control wide input range: 6v to 40v switching current 10.5a min. pwm control built-in compensation circuit oscillating frequency: 150khz typ. soft start function 10ms typ. uvlo (under voltage lockout) over current protection thermal shutdown function package outline to-220f-4pin block diagram v + in- er ? amp buf f er ocp current sense tsd vref sof t start uv lo slope comp. 0.8v s q r osc gnd sw pwm low frequency contr ol dr ain source the NJW4158 is a current mode controlled buck converter with 40v/8a mosfet that operates wide input range from 6v to 35v. the NJW4158 can realize a buck converter with minimal external components that it includes compensation circuit. the NJW4158 is able to stable startup by soft start function. a lso, it has over current protection and thermal shutdown circuit. it is suitable for supplying power to an office automation equipment, industrial instrum ent, amusement, wireless base station applications and so on. pin configuration 1. v + 2. sw 3. gnd 4. in- NJW4158f NJW4158fl 1 2 3 4
NJW4158 - 2 - ver.2012-08-06 absolute maximum ratings (ta=25c) parameter symbol maximum ratings unit supply voltage v + +45 v drain ? source pin voltage v dss -50 v in- pin voltage v in- -0.3 to +6 v power dissipation p d 2.1 (device itself) w junction temperature range tj -40 to +150 c operating temperature range t opr -40 to +85 c storage temperature range t stg -40 to +150 c recommended operating conditions parameter symbol min. typ. max. unit supply voltage v + 6 12 40 v in- pin voltage v in- 0 ? 5.5 v thermal characteristics parameter symbol thermal resistance unit junction-to-ambient temperature ja 59.5 c/w junction-to-case jt 7.5 c/w power dissipation vs. ambient temperature 0 4 8 12 16 -50 -25 0 25 50 75 100 ambient temperature ta ( o c) power dissipation p d (w) power dissipation vs. ambient temperature (tj= ~150 o c) hs =20 o c/w hs =10 o c/w hs =5 o c/w without heat sink infinity heat sink
NJW4158 - 3 - ver.2012-08-06 electrical characteristics (unless otherwise noted, v + =12v, ta=25 c) parameter symbol test condition min. typ. max. unit under voltage lockout block on threshold voltage v t_on v + = l h 5.2 5.4 5.6 v off threshold voltage v t_off v + = h l 4.4 4.6 4.8 v hysteresis voltage v hys 400 800 ? mv soft start block soft start time t ss v b =0.75v 5 10 20 ms oscillator block oscillation frequency f osc v in- =0.7v 135 150 165 khz oscillation frequency (low frequency control) f osc_low v in- =0.4v ? 50 ? khz oscillation frequency deviation (supply voltage) f dv v + =6v to 40v ? 1 ? % oscillation frequency deviation (temperature) f dt ta = - 4 0 c to +85 c ? 5 ? % error amplifier block reference voltage v b -1.0% 0.8 +1.0% v input bias current i b -0.1 ? +0.1 a pwm comparate block maximum duty cycle m ax d uty v in- =0.7v 85 90 ? % minimum on time t on_min ? 660 850 ns over current protection cool down time t cool ? 24 ? ms output block output on resistance r on i sw =8a ? 55 80 m ? switching current limit i lim 10.5 12.5 15 a switching current limit 2 i lim2 v + =30v 10.5 12.5 15 a switching leak current i leak v + =45v, v sw =0v ? ? 20 a general characteristics quiescent current i dd r l =no load, v in- =0.7v ? 7 9.5 ma
NJW4158 - 4 - ver.2012-08-06 mark specification 1 4158 jrc 2 3 4 part number (indicating NJW4158f or NJW4158fl) logo mark lot typical applications c fb r2 c out l sbd NJW4158 v in c in1 r1 v out r fb 1 34 2 v out = r2 r1 +1 x v b [v] c in2 *when large current flows, v in line may be unstable. therefore, you should put c in on near ic as much as possible.
NJW4158 - 5 - ver.2012-08-06 typical characteristics quiescent current vs. supply voltage (r l =no load, v in- =0.7v, ta=25c) 0 1 2 3 4 5 6 7 8 9 10 0 10203040 supply voltage v + (v) quiescent current i dd (ma) oscillation frequency vs. supply voltage (v in- =0.7v, ta=25c) 135 140 145 150 155 160 165 0 10203040 supply voltage v + (v) oscillation frequnecny f osc (khz) reference voltage vs. supply voltage (ta=25c) 0.79 0.795 0.8 0.805 0.81 0 10203040 supply voltage v + (v) reference voltage v b (v)
NJW4158 - 6 - ver.2012-08-06 typical characteristics reference voltage vs. temperature (v + =12v) 0.79 0.795 0.8 0.805 0.81 -50 -25 0 25 50 75 100 125 150 ambient temperature ta (c) reference voltage v b (v) oscillation frequency vs temperature (v + =12v, v in- =0.7v) 135 140 145 150 155 160 165 -50 -25 0 25 50 75 100 125 150 ambient temperature ta (c) oscillation frequency fosc (khz) switching current limit vs. temperature (v + =12v) 8 10 12 14 16 18 20 -50 -25 0 25 50 75 100 125 150 ambient temperature ta (c) switching current limit i lim (a) switching current limit 2 vs. temperature (v + =30v) 8 10 12 14 16 18 20 -50 -25 0 25 50 75 100 125 150 ambient temperature ta (c) switching current limit i lim2 (a) output on resistance vs. temperature (i sw =8a) 0 10 20 30 40 50 60 70 80 90 100 -50 -25 0 25 50 75 100 125 150 ambient temperature ta (c) output on resistance r on (m ? ) switching leak current vs. temperature (v + =45v, v sw =0v) 0 2 4 6 8 10 12 14 16 18 20 -50 -25 0 25 50 75 100 125 150 ambient temperature ta (c) switching leak current i leak (a)
NJW4158 - 7 - ver.2012-08-06 typical characteristics minimum on time vs. temperature (v + =12v) 0 100 200 300 400 500 600 700 800 900 -50 -25 0 25 50 75 100 125 150 ambient temperature ta (c) minimum on time t on-min (ns) v + =40v v + =12v v + =6v under voltage lockout voltage vs. temperature 4.4 4.6 4.8 5 5.2 5.4 5.6 -50 -25 0 25 50 75 100 125 150 ambient temperature ta (c) threshold voltage (v) v t_on v t_off maximum duty cycle vs. temperature (v + =12v, v in- =0.7v) 84 86 88 90 92 94 96 98 100 -50 -25 0 25 50 75 100 125 150 ambient temperature ta (c) maximum duty cycle m ax d uty (%) quiescent current vs. temperature (r l =no load, v in- =0.7v) 0 1 2 3 4 5 6 7 8 9 10 -50-25 0 255075100125150 ambient temperature ta (c) quiescent current i dd (ma) v + =40v v + =12v v + =6v soft start time vs. temperature (v + =12v, v b =0.75v) 4 6 8 10 12 14 16 18 20 -50-25 0 255075100125150 ambient temperature ta (c) soft start time tss (ms)
NJW4158 - 8 - ver.2012-08-06 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.
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