ap1502 200khz, 1a pwm buck dc/dc co nverter & 1 linear ctrl this datasheet contains new product information. anachip corp. reserves the rights to modify the product specification without notice. no liability is assumed as a result of the use of this product. no rights under any patent accompany the sale of the product. rev.1.0 jun 17, 2004 1/5 ? features - provides two regulated voltages -one pwm regulator (direct output or drive npn) -one linear controller (drive npn or n-mos) - output voltage: 3.3v, 5v, 12v and adjustable - adjustable version: output voltage range, 1.2v to 12v+ 2% - 200khz + 10% fixed switching frequency - thermal-shutdown and current-limit protection - shutdown control input (en pin) - operating voltage can be up to 20v - output current: 1a (pwm controller) - package: sop7 (ap1502) - low power standby mode - build-in switching transistors on chip ? applications - simple high-efficiency step-down regulator - on-card switching regulators - positive to negative converter ? general descriptions the ap1502 series are monolithic ic?s containing a pwm and a linear power controller. the pwm regulator has an ability of driving a 1a load without additional external transistors. due to the reduced the number of external components, board space can be saved easily. the external shutdown function can be controlled by logic level and switching the ic into standby mode. the internal compensation provides a good line and load regulation without external components. regard the protecting functions: thermal shutdown is to prevent the ic from damage by operating on over temperature, and current limit is against over current in the output switch. the ap1502 series operates at a switching frequency of 200khz thus allowing smaller sized filter components than what would be needed with lower frequency switching regulators. other features include a guaranteed + 2% tolerance on output voltage under specified input voltage and output load conditions, and + 10% on the oscillator frequency. the version range included for the pwm part fixed output voltages of 3.3v, 5v, 12v, and an adjustable version. the linear controller is able to drive an external npn transistor, which a current limit set to 30ma pre-driver of ap1502 series. the ic?s are available in a standard sop7 package for ap1502. ? pin assignments ap1502 7 5 4 3 2 1 6 out1 fb2 en fb1 out2 v cc (top view) gnd ? pin descriptions name description v cc operating voltage input out1 switching output (direct output or drive external npn) gnd ground fb1 fb2 output voltage feedback control en on/off shutdown out2 linear controller driving external npn
ap1502 200khz, 1a pwm buck dc/dc co nverter & 1 linear ctrl anachip corp. www.anachip.com.tw rev. 1.0 jun 17 , 2004 2/5 ? ordering information output version package packing s7 : sop-7l ap1502 x x x x blank:adjustable 33 : 3.3v 50 : 5.0v 12 : 12v blank : tube a : taping x x lead free blank : normal l : lead free package ? block diagram current source bias 1.235v reference 2.5v regulator 200khz osc. start up + + _ + _ thermal limit pre-driver comp comp gnd out1 v cc en fb1 1a switch + _ _ amp comp fb2 + _ amp current limit buffer out2 lpf current sensor lpf en
ap1502 200khz, 1a pwm buck dc/dc co nverter & 1 linear ctrl anachip corp. www.anachip.com.tw rev. 1.0 jun 17 , 2004 3/5 ? absolute maximum ratings symbol parameter rating unit v cc supply voltage 22 v v en en pin input voltage -0.3 Q v Q 22 v v fb feedback pin voltage -0.3 Q v Q 22 v v out1 output voltage to ground -1 v v out2 linear driver voltage to ground -0.3 Q v Q 22 v p d power dissipation internally limited w t st storage temperature -65 to 150 o c t op operating temperature -40 to +125 o o c v op operating voltage 4.5 to 20 v ? electrical characteristics (all output voltage versions & channels) unless otherwise specified ap1502, vin=12v for 3.3v, 5v, adjustable version and vin=20v for the 12v version. i load = 0.2a. symbol parameter conditions min. typ. max. unit i b1/2 feedback bias current v fb1/2 =1.3v(fb1,adj version) 100 1000 na f osc oscillator freque ncy 150 200 250 khz v sat1 saturation voltage (v cc -v out1 ) i out =0.8a v fb1 =0 force driver on 0.9 v v sat2 saturation voltage (v cc -v out2 ) i out =20ma(no external npn or n-mos) v fb1 =0v force driver on 0.6 v max. duty cycle(on) v fb1 =0v force driver on 100 % dc min. duty cycle(off) v fb1 =12v force driver off 0 % i cl1 current limit(out1) peak current v fb1 =0v force driver on 1.1 a out1= 0 v 50 ua i leak1 out1 leakage current v fb1 =12v force driver off v cc =20v out1= -1v 2 30 ma i q quiescent current (v cc ) v fb1/2 =12v force driver off 6 ma i stby standby quiescent current en(on/off) pin=5v v cc =20v 60 100 ua v il low (regulator on) - 0.6 v ih en pin logic input threshold voltage high (regulator off) 2.0 1.3 - v i h en pin input current v logic =2.5v (regulator off) -0.03 i l en pin input current v logic =0.5v (regulator on) 0.3 ua i cl2 current limit (out2) v cc =5v, v out2 =v fb2 =0v 50 ma v fb2 out2 feedback voltage 4.75v < v cc1 < 20v 3.0v < v cc2 < 20v 0.2a < i load < 1a , t a =25 o c 1.225 1.25 1.275 v jc thermal resistor junction to case 15 o c/w ja thermal resistor junction to ambient 90 o c/w
ap1502 200khz, 1a pwm buck dc/dc co nverter & 1 linear ctrl anachip corp. www.anachip.com.tw rev. 1.0 jun 17 , 2004 4/5 ? electrical characteri stics (continued) symbol parameter conditions min. typ. max. unit v fb1 output feedback 4.5v < vcc< 20v 0.2a < iload < 0.9a 1.225 1.25 1.275 v ap1502-adj efficiency v in = 12v, i load =0.9a, v out programmed for 3v 73 % v out1 output voltage 4.75v < v cc < 20v 0.2a < i load < 0.9a 3.23 3.3 3.37 v ap1502-3.3v efficiency v in = 12v, i load =0.9a 73 % v out1 output voltage 7.0v < v cc < 20v 0.2a < i load < 0.9a 4.90 5 5.10 v ap1502-5v efficiency v in = 12v, i load =0.9a 77 % v out1 output voltage 15v < v cc < 20v 0.2a < i load < 0.9a 11.75 12 12.25 v ap1502-12v efficiency v in = 20v, i load =0.9a 82 % ? typical application circuit out 1 gnd fb 1 en fb 2 out 2 v cc 1 2 3 4 7 5 6 v cc1 v out2 v out1 =3.3v v cc2 =3.3v 240 ohm 120 ohm =1.8v 47uh 240 ohm 420 ohm 470uf 220uf 470uf ap1502 (1) out 1 gnd fb 1 en fb 2 out 2 v cc 1 2 3 4 7 5 6 v cc1 v out2 v out1 =3.3v v cc2 =3.3v v cc1 470uf 240 ohm 120 ohm 220uf 470uf 10uf 240 ohm 420 ohm 4.7k ohm 47uh =1.8v ap1502 (2)
ap1502 200khz, 1a pwm buck dc/dc co nverter & 1 linear ctrl anachip corp. www.anachip.com.tw rev. 1.0 jun 17 , 2004 5/5 ? marking information ( top view ) logo output type blank : adj 50 : 5.0v 33 : 3.3v 12 : 12v id code: internal year: "01" = 2001 "02" = 2002 xth week: 01~52 ~ 1 4 ac ap1502 xx yy ww x x 5 7 blank: normal l: lead free package ? package information package type: sop-7l a c c2 b1 d e e b2 f c3 c1 dimensions in millimeters dimensions in inches symbol min. nom. max. min. nom. max. a 5.79 5.99 6.19 0.228 0.236 0.244 b1 3.83 3.91 3.99 0.151 0.154 0.157 b2 3.78 3.86 3.94 0.149 0.152 0.155 c 4.80 4.87 4.94 0.189 0.192 0.194 c1 1.57 1.67 1.77 0.062 0.066 0.070 c2 0.32 0.4 0.48 0.013 0.016 0.019 c3 1.17 1.27 1.37 0.046 0.050 0.054 d 0.19 0.22 0.25 0.007 0.009 0.010 e 1.04ref 0.041ref e 0.48 0.68 0.88 0.019 0.027 0.035 f 1.35 1.45 1.55 0.053 0.057 0.061 7 o 7 o
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