preliminary pj2596 150khz, 3a pwm buck switching regulator 1-6 2004/07.rev.b the pj2596 is a monolithic integrated circuit that provide all the active function for a step-down switching regulator, capable of driving a 3a load without additional transistor component. the external shutdown function can be controlled by ttl logic level and then into standby mode. the internal compensation makes feedback control have good line and load regulation without external design. regarding protected function, thermal shutdown is to prevent over temperature operating from damage, and current limit is against over current operating of the output switch. the pj2596 operates at a swit ching frequency of pj2596 thus allowing smaller sized filter co mponents than what would be needed with lower frequency switching regulators. other features include a guaranteed 4% tolerance on output voltage under specified input voltage and output load conditions, and 15% on the oscillator frequency. the output version included fixed 3.3v, 5v, 12v, and an adjustable type. ____________ ? 3.3v, 5v, 12v and adjustable output versions ? input voltage range up to 25v ? output load current: 3a ? built-in switching transistor on chip ? low power standby mode ? on/off shutdown control input ? thermal-shutdown and current-limit protection ? 150khz fixed frequency internal oscillator ? voltage mode non-synchronous pwm control ? adjustable version output voltage range, 1.23v to 25v4% max over line and load condition ? simple high-efficiency st ep-down(buck) regulator ? battery charger ? positive to negative converter ? on-card switching regulator ? efficient preregulator for linear regulator to-220-5l to-263-5l pin 1. input pin 2. output pin 3. ground pin 4. feed back pin 5.on/off device operating temperature package pj2596cz-xx to-220-5l pj2596cm-xx -40 to +85 to-263-5l note: xx is output voltage available for adj /3.3v/ 5.0v/ 12v. contact factory for additional voltage option. t ordering information typical application circuit applications features
preliminary pj2596 150khz, 3a pwm buck switching regulator 2-6 2004/07.rev.b parameter symbol rating supply voltage vcc 25v on/off pin input voltage von/off -0.3 to +25v feedback pin voltage v fb -0.3 to +25v output voltage to ground vout -1v power dissipation p d internally limited storage tempurature t st -65 to +150 operating tempeture t op -40 to +125 operating voltage v op +4.5 to +25v vin =12v for the 3.3v, 5v, and adjustable version and vin =24v for the 12v version , tj = 25 , i l = 0.3a, unless otherwise noted. parameter conditions min typ max units 60 feedback bias current vfb = 1. 3v( adjustable version only) -- 40 100 na 127 173 oscillator frequency 110 150 173 khz 1.4 saturation voltage iout = 3ano outside circuit v fb =0v force driver on 1.3 1.5 v 100 max duty cycle (on) min duty cycle (off) v fb =0v force driver on v fb =12v force driver off 0 % 5.5 current limit peak current no outside circuit v fb =0v force driver on 3.5 4.5 6.5 a output = 0v 200 output leakage current output = -1v no outside circuit v fb =12v force driver off vin=24v -- 2 30 ua ma quiescent current v fb =12 force driver off -- 5 10 ma 250 standby quiescent current on/off pin = 5v (off) -- 50 300 ua 2.0 0.6 on/off pin logic input voltage threshold low (regulator on) high (regulator off) 1.3 v on/off pin logic input current -- 15 25 on/off pin input current v logic =2.5v (off) v logic =0.5v (on) -- 0.02 5 ua to-220-5l 2.5 thermal resistance to-263-5l junction to case -- 3.5 -- /w to-220-5l 28 thermal resistance with copper area of approximately 3 in 2 to-263-5l junction to ambient -- 23 -- /w electrical characteristics absolute maximum ratings
preliminary pj2596 150khz, 3a pwm buck switching regulator 3-6 2004/07.rev.b typical performance characteristics normalized output voltage junction temperature( ) efflciency junction temperature( ) typical performance characterictics block diagram and typical applications
preliminary pj2596 150khz, 3a pwm buck switching regulator 4-6 2004/07.rev.b switch saturation voltage switch current(a) switch current limit junction temperature( ) operating quiescent current junction temperature( ) shutdown quiescent current supply volotage(v) minimum operating supply votage junction temperature( ) on/off threshold voltage junction temperature( )
preliminary pj2596 150khz, 3a pwm buck switching regulator 5-6 2004/07.rev.b on/off current (sinking) on /off voltage(v) switch frequency junction temperature( ) feedback pin bias current junction temperature( )
preliminary pj2596 150khz, 3a pwm buck switching regulator 6-6 2004/07.rev.b to-220-5l mechanical drawing 1.top view 2.side view a c b f d e h g m l n j i k min 10.00 3.70 2.65 0.80 millimeters 1.65 13.80 4.50 28.60 2.48 0.36 1.24 6.10 14.70 8.40 i m n j k l e g h f c d b dim a 0.154 0.110 0.035 0.069 0.551 0.181 1.134 0.100 0.016 0.050 0.252 0.587 0.343 28.80 1.125 6.40 14.90 2.55 0.40 8.70 0.240 0.578 0.097 0.014 0.330 14.00 4.60 1.28 3.90 2.80 0.90 1.75 0.543 0.177 0.048 0.145 0.104 0.031 0.064 max 0.413 to-220-5l dimension max 10.50 inches min 0.393 to-263-5l mechanical drawing 1.top view 2.side view a c d b e i h g f a i h g d f e c b dim 0.393 10.50 0.413 10.00 1.40 8.70 0.50 1.14 8.50 0.30 0.044 0.334 0.011 0.90 1.40 4.65 1.82 15.87 1.10 1.57 4.40 0.75 14.60 0.043 0.173 0.061 0.029 0.574 0.055 0.343 0.020 0.055 0.183 0.072 0.035 0.625 to-263-5l dimension inches max millimeters min min max
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