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preliminary datasheet 380khz, 3a asynchronous dc - dc buck converter ap3203 mar. 2011 rev. 1. 0 bcd semiconductor manufacturing limited 1 general description the ap3203 is a 380khz fixed frequency, current mode, pwm buck (step-down) dc-dc converter, capable of driving a 3a load with high efficiency, excellent line and load regulation. the device integrates n-channel power mosfet switch with low on-resistance. the current mode control provides fast transient response a nd cycle-by-cycle current limit. a standard series of indu ctors are available from several different manufacturers optimized for use with the ap3203. this feature greatly simplifies the design of switch-mode power supplies. this ic is available in psop-8 package. features ? input voltage range: 4.75v to 18v ? fixed 380khz frequency ? high efficiency: up to 93% ? output current: 3a ? current mode control ? built-in over current protection ? built-in thermal shutdown function ? built-in uvlo function ? built-in over voltage protection ? programmable soft-start applications ? portable dvd ? dpf ? lcd-tv ? stb figure 1. package type of ap3203 psop-8
preliminary datasheet 380khz, 3a asynchronous dc - dc buck converter ap3203 mar. 2011 rev. 1. 0 bcd semiconductor manufacturing limited 2 pin configuration mp package (psop-8) figure 2. pin configuration of ap3203 (top view) pin description pin number pin name function 1 bs bootstrap pin. a bootstrap capacitor is connected between the bs pin and sw pin. the voltage across the bootstrap capacitor drives the internal high-side nmos switch 2 in supply input pin. a capacitor should be connected between the in pin and gnd pin to keep the dc input voltage constant 3 sw power switch output pin. this pin is connected to the inductor and bootstrap capacitor 4 gnd ground pin 5 fb feedback pin. this pin is connected to an external resistor divider to program the system output voltage. when the fb pin voltage exceeds 20% of the nominal regulation value of 1.222v, the over voltage protection is triggered. when the fb pin voltage is below 0.6v, the oscillator frequency is lowered to realize short circuit protection 6 comp compensation pin. this pin is the output of the transconductance error amplifier and the input to the current comparator. it is used to compensate the control loop. connect a series rc network from this pin to gnd. in some cases, an additional capacitor from this pin to gnd pin is required 7 en control input pin. forcing this pin above 1.5v or set this pin floating enables the ic. forcing this pin below 0.5v shuts down the ic. when the ic is in shutdown mode, all functions are disabled to decrease the supply current below 1 a 8 ss soft-start control input. ss controls the soft-start period. connect a capacitor from ss to gnd to set the soft-start period. a 0.1f capacitor sets the soft-s tart period to 10ms. to disable the soft-start feature, leave ss disconnected
preliminary datasheet 380khz, 3a asynchronous dc - dc buck converter ap3203 mar. 2011 rev. 1. 0 bcd semiconductor manufacturing limited 3 tr: tape & reel blank: tube functional block diagram s r q q internal bias and regulator oscillator 90k/380k 2 1 5v m1 0.12 bs current sense amplifier clk slop comp 7 5 4 3 m2 10 sw gnd error amplifier 6 comp fb 1.222 0.6 short protection comparator shutdown comparator 0.4/1.5v 1. 3 v 8 ss pwm comparator in en v a v b v b 6 a internal pull high figure 3. functional block diagram of ap3203 ordering information ap3203 - circuit type package mp: psop-8 package temperature range part number marking id packing type AP3203MP-G1 3203mp-g1 tube psop-8 -40 to 85oc ap3203mptr-g1 3203mp-g1 tape & reel bcd semiconductor's pb-free products, as designated with "g1" suffix in the part number, are rohs compliant and green. g1: green
preliminary datasheet 380khz, 3a asynchronous dc - dc buck converter ap3203 mar. 2011 rev. 1. 0 bcd semiconductor manufacturing limited 4 absolute maximum ratings (note 1) parameter symbol value unit in pin voltage v in -0.3 to 20 v en pin voltage v en -0.3 to v in v sw pin voltage v sw 21 v bs pin voltage v bs -0.3 to v sw +6 v fb pin voltage v fb -0.3 to 6 v comp pin voltage v comp -0.3 to 6 v ss pin voltage v ss -0.3 to 6 v thermal resistance ja 105 oc/w operating junction temperature t j 150 oc storage temperature t stg -65 to 150 oc lead temperature (soldering, 10sec) t lead 260 oc esd (machine model) 200 v esd (human body model) 2000 v note 1: stresses greater than those listed under ?absolute maximum ratings? may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under ?recommended operating co nditions? is not implied. exposure to ?absolute maximum ratings? for extended periods may affect device reliability. recommended operating conditions parameter symbol min max unit input voltage v in 4.75 18 v maximum output current i out (max) 3 a operating ambient temperature t a -40 85 oc
preliminary datasheet 380khz, 3a asynchronous dc - dc buck converter ap3203 mar. 2011 rev. 1. 0 bcd semiconductor manufacturing limited 5 electrical characteristics v in =v en =12v, v out =3.3v, t a =25 o c, unless otherwise specified. and those in boldface type apply over the full operating temperature rang (t a =-40oc to +85oc). parameter symbol conditions min typ max unit input voltage v in 4.75 18 v quiescent current i q v en =2v, v fb =1.35v 1.0 1.5 ma shutdown supply current i shdn v en =0v 1 10 a feedback voltage v fb 1.185 1.222 1.258 v feedback over voltage threshold v fbov 1.48 v feedback scp voltage threshold v fb_scp 0.6 v feedback bias current i fb v fb = 1v -0.1 0.1 a upper switch on-resistance r dsonh i sw =0.5a 0.12 ? lower switch on-resistance r dsonl i sw =0.05a 10 ? high-side switch leakage current i leakh v in =18v, v en =0v v sw =0v 0.1 10 a high-side switch current limit i limh 4 5.2 a low-side switch current limit i liml from drain to source 0.15 a v enh 1.5 v en pin threshold v enl 0.5 v en pull-up current i en_ph v en =0v 1.0 a input uvlo threshold v uvlo v in rising 3.55 3.85 4.15 v input uvlo hysteresis v hys 0.3 v oscillator frequency f osc1 380 khz short circuit oscillator frequency f osc2 80 khz maximum duty cycle d max v fb =1.0v 90 % minimum duty cycle d min v fb =1.35v 0 % error amplifier voltage gain (note 3) a ea 400 v/v error amplifier transconductance g ea 700 950 1200 a/v comp to current sense transconductance g cs 5.4 a/v thermal shutdown (note 3) t otsd 160 oc thermal shutdown hysteresis (note 3) t hys 30 oc soft-start time (note 3) t ss c4=0.1 f, i out =500ma 10 ms soft-start current i ss 6 a
preliminary datasheet 380khz, 3a asynchronous dc - dc buck converter ap3203 mar. 2011 rev. 1. 0 bcd semiconductor manufacturing limited 6 note 2: 2 sw 1 sw 2 sw 1 sw dson i i v v r ? ? = note 3: not tested, guaranteed by design. typical performance characteristics t a =25 oc , v in =12v, v out =3.3v, unless otherwise noted. figure 4. efficiency vs. output current figure 5. quiescent current vs. temperature figure 6. output voltage vs. output current figure 7. feedback voltage vs. temperature -60 -40 -20 0 20 40 60 80 100 120 140 0.70 0.75 0.80 0.85 0.90 0.95 1.00 1.05 1.10 1.15 1.20 1.25 1.30 1.35 1.40 quiescent current (ma) temperature ( o c) 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.00 3.05 3.10 3.15 3.20 3.25 3.30 3.35 3.40 3.45 3.50 output voltage (v) output current (a) -60 -40 -20 0 20 40 60 80 100 120 140 1.10 1.12 1.14 1.16 1.18 1.20 1.22 1.24 1.26 1.28 1.30 feedback volage (v) temperature ( o c) 0.00.51.01.52.02.53.0 0 10 20 30 40 50 60 70 80 90 100 efficiency (%) output current (a) v in =12v v in =5v
preliminary datasheet 380khz, 3a asynchronous dc - dc buck converter ap3203 mar. 2011 rev. 1. 0 bcd semiconductor manufacturing limited 7 typical performance characteristics (continued) t a =25 oc , v in =12v, v out =3.3v, unless otherwise noted. figure 8. r dsonh vs. temperature figure 9. r dsonl vs. temperature figure 10. output ripple figure 11. load transient (v in =12v,v out =3.3v, i out =3a) (v in =12v, v out =3.3v, i out =2a to 3a) v sw 5v/div i l 1a/div v out(ac) 20mv/div time 10ms/div i l 1a/div v out(ac) 200mv/ di -60 -40 -20 0 20 40 60 80 100 120 140 60 70 80 90 100 110 120 130 140 150 160 170 high-side switch on-resistance (m ? ) temperature ( o c) -40 -20 0 20 40 60 80 100 120 140 6 8 10 12 14 16 18 low-side switch on-resistance ( ? ) temperature ( o c) time 2 s/div time 400 s/div
preliminary datasheet 380khz, 3a asynchronous dc - dc buck converter ap3203 mar. 2011 rev. 1. 0 bcd semiconductor manufacturing limited 8 typical performance characteristics (continued) t a =25 oc , v in =12v, v out =3.3v, unless otherwise noted. figure 12. enable turn off figure 13. enable turn on (v in =12v,v out =3.3v, i out =3a, with resister load) (v in =12v,v out =3.3v, i out =3a, with resistance load) figure 14. short circuit protection figure 15. short circuit recovery (v in =12v, v out =3.3v, i out =3a) (v in =12v, v out =3.3v, i out =3a) v out 1v/div i l 2a/div v sw 5v/div time 10ms/div v out 1v/div i l 2a/div v en 2v/div time 10ms/div v sw 5v/div v out 2v/div i l 2a/div v sw 5v/div time 200 s/div v out 2v/div i l 2a/div v sw 5v/div time 400 s/div v en 2v/div
preliminary datasheet 380khz, 3a asynchronous dc - dc buck converter ap3203 mar. 2011 rev. 1. 0 bcd semiconductor manufacturing limited 9 typical application figure 8. typical application of ap3203
preliminary datasheet 380khz, 3a asynchronous dc - dc buck converter ap3203 mar. 2011 rev. 1. 0 bcd semiconductor manufacturing limited 10 mechanical dimensions psop-8 unit: mm(inch) 3.202(0.126) 3.402(0.134)
important notice bcd semiconductor manufacturing limited reserves the right to make changes without further not ice to any products or specifi- cations herein. bcd semiconductor manufacturing limited does not as sume any responsibility for us e of any its products for any particular purpose, nor does bcd semiconductor manufacturi ng limited assume any liability aris ing out of the application or use of any its products or circui ts. bcd semiconductor manufacturing limited does not convey any license under its patent rights or other rights nor the rights of others. - wafer fab shanghai sim-bcd semiconductor manufacturing co., ltd. 800 yi shan road, shanghai 200233, china tel: +86-21-6485 1491, fax: +86-21-5450 0008 main site regional sales office shenzhen office shanghai sim-bcd semiconductor manuf acturing co., ltd., shenzhen office unit a room 1203, skyworth bldg., gaoxin ave.1.s., nanshan district, shenzhen, china tel: +86-755-8826 7951 fax: +86-755-8826 7865 taiwan office bcd semiconductor (taiwan) company limited 4f, 298-1, rui guang road, nei-hu district, taipei, taiwan tel: +886-2-2656 2808 fax: +886-2-2656 2806 usa office bcd semiconductor corp. 30920 huntwood ave. hayward, ca 94544, usa tel : +1-510-324-2988 fax: +1-510-324-2788 - headquarters bcd semiconductor manufacturing limited no. 1600, zi xing road, shanghai zizhu sc ience-based industrial park, 200241, china tel: +86-21-24162266, fax: +86-21-24162277 bcd semiconductor manufacturing limited important notice bcd semiconductor manufacturing limited reserves the right to make changes without further not ice to any products or specifi- cations herein. bcd semiconductor manufacturing limited does not as sume any responsibility for us e of any its products for any particular purpose, nor does bcd semiconductor manufacturi ng limited assume any liability aris ing out of the application or use of any its products or circui ts. bcd semiconductor manufacturing limited does not convey any license under its patent rights or other rights nor the rights of others. - wafer fab shanghai sim-bcd semiconductor manufacturing limited 800, yi shan road, shanghai 200233, china tel: +86-21-6485 1491, fax: +86-21-5450 0008 bcd semiconductor manufacturing limited main site regional sales office shenzhen office shanghai sim-bcd semiconductor manuf acturing co., ltd. shenzhen office advanced analog circuits (shanghai) corporation shenzhen office room e, 5f, noble center, no.1006, 3rd fuzhong road, futian district, shenzhen 518026, china tel: +86-755-8826 7951 fax: +86-755-8826 7865 taiwan office bcd semiconductor (taiwan) company limited 4f, 298-1, rui guang road, nei-hu district, taipei, taiwan tel: +886-2-2656 2808 fax: +886-2-2656 2806 usa office bcd semiconductor corporation 30920 huntwood ave. hayward, ca 94544, u.s.a tel : +1-510-324-2988 fax: +1-510-324-2788 - ic design group advanced analog circuits (shanghai) corporation 8f, zone b, 900, yi shan road, shanghai 200233, china tel: +86-21-6495 9539, fax: +86-21-6485 9673 bcd semiconductor manufacturing limited http://www.bcdsemi.com bcd semiconductor manufacturing limited

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