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data sheet 340khz, 3a synchronous dc-dc buck converter ap3503 may. 2012 rev. 1. 7 bcd semiconductor manufacturing limited 1 general description the ap3503 is a 340khz fixed frequency, current mode, pwm synchronous 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 switches with low on-resistance. current mode control provides fast transient response and cycle-by-cycle current limit. the ap3503 employs complete protection to ensure system security. including output over voltage protection, input under voltage lockout, programmable soft-start, over temperature protection to safeguard the circuit. this ic is available in psop-8 package. features ? input voltage range: 4.5v to 18v ? fixed 340khz frequency ? high efficiency: up to 95% ? 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 ? lcd tv ? set top box ? portable dvd ? digital photo frame figure 1. package type of ap3503 psop-8
data sheet 340khz, 3a synchronous dc-dc buck converter ap3503 may. 2012 rev. 1. 7 bcd semiconductor manufacturing limited 2 pin configuration mp package (psop-8) 1 2 3 4 8 7 6 5 figure 2. pin configurat ion of ap3503 (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 power mosfet 2 in supply power input pin. a capacitor should be connected between the in pin and gnd pin to keep the 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 1.1v, the over voltage protection is triggered. when the fb pin voltage is below 0.3v, 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. en is a digital input that turns the regulator on or off. drive en high/low to turn on/off the regulator. pull up with 100k ? resistor for automatic startup 8 ss soft-start control input pin. ss controls the soft -start period. connect a capacitor from ss to gnd to set the soft-start period. a 0.1 f capacitor sets the soft-s tart period to 15ms. to disable the soft-start feature, leave ss unconnected ep exposed pad. it should be connected to gnd in pcb layout
data sheet 340khz, 3a synchronous dc-dc buck converter ap3503 may. 2012 rev. 1. 7 bcd semiconductor manufacturing limited 3 tr: tape & reel blank: tube functional block diagram s r q q internal regulator oscillator 2 7 5 4 3 1 va bs sw gnd ea 6 comp fb en in comparator 8 ss current sense amplifier clk slop comp pwm comparator 1.3 v + scp va vb vb 6 a 90 k/340k 0. 925 v 2.5v m1 m2 0.3v comparator 1.5v shutdown lock figure 3. functional block diagram of ap3503 ordering information ap3503 - circuit type package temperature range part number marking id packing type psop-8 -40 to 85 c AP3503MP-G1 3503mp-g1 tube ap3503mptr-g1 3503mp-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 package mp: psop-8
data sheet 340khz, 3a synchronous dc-dc buck converter ap3503 may. 2012 rev. 1. 7 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 60 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 (human body model) v hbm 2000 v esd (machine model) v mm 200 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 op eration 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 4.5 18 v operating ambient temperature t a -40 85 oc
data sheet 340khz, 3a synchronous dc-dc buck converter ap3503 may. 2012 rev. 1. 7 bcd semiconductor manufacturing limited 5 electrical characteristics t a =25oc, v in =v en =12v, v out =3.3v, unless otherwise specified. parameter symbol conditions min typ max unit supply voltage (in pin) input voltage v in 4.5 18 v quiescent current i q v fb =1v,v en =3v 1.2 1.4 ma shutdown supply current i shdn v en =0v 0.1 10 a under voltage lockout input uvlo threshold v uvlo v in rising 3.65 4.00 4.25 v input uvlo hysteresis v hys 200 mv enable (en pin) en shutdown threshold voltage 1.1 1.5 2 v en shutdown threshold voltage hysteresis (note 2) 350 mv en lockout threshold voltage 2.2 2.5 2.7 v en lockout hysteresis 210 mv voltage reference (fb pin) feedback voltage v fb 0.907 0.925 0.943 v feedback over voltage threshold v fbov 1.1 v feedback bias current i fb v fb =1v -0.1 0.1 a mosfet high-side switch on-resistance(note 3) r dsonh i sw =0.2a/0.7a 100 m ? low-side switch on-resistance(note 3) r dsonl i sw =-0.2a/-0.7a 100 m ? current limit high-side switch leakage current i leakh v in =18v,v en =v sw =0v 0.1 10 a high-side switch current limit i limh 4.3 5.6 a low-side switch current limit i liml from drain to source 1.4 a switching regulator oscillator frequency f osc1 280 340 400 khz short circuit oscillator frequency f osc2 90 khz max. duty cycle d max v fb =0.85v 90 % min. duty cycle d min v fb =1v 0 % error amplifier error amplifier voltage gain (note 2) a ea 400 v/v error amplifier transconductance g ea 800 thermal shutdown thermal shutdown (note 2) t otsd 160 oc thermal shutdown hysteresis (note 2) t hys 20 oc soft start (ss pin) soft-start time (note 2) t ss c ss =0.1 f 15 ms soft-start current v ss =0v 6 a note 2: not tested, guaranteed by design. note 3: r dson = sw2 sw1 sw2 sw1 i - i v - v .
data sheet 340khz, 3a synchronous dc-dc buck converter ap3503 may. 2012 rev. 1. 7 bcd semiconductor manufacturing limited 6 typical performance characteristics t a =25oc, v in =12v, v out =3.3v, unless otherwise noted. figure 4. efficiency vs. output current figure 5. quiescent current vs. case temperature figure 6. feedback voltage vs. case temperature figure 7. output voltage vs. output current 0.0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 3.2 10 20 30 40 50 60 70 80 90 100 efficiency (%) output current (a) v out =3.3v, t a =25 o c, l=10 h v in =5v v in =12v -50 -25 0 25 50 75 100 125 150 0.9 1.0 1.1 1.2 1.3 1.4 quiescent current (ma) case temperature ( o c) -50 -25 0 25 50 75 100 125 150 0.6 0.7 0.8 0.9 1.0 1.1 1.2 feedback voltage (v) case temperature ( o c) 0.0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 3.2 3.0 3.1 3.2 3.3 3.4 3.5 3.6 output voltage (v) output current (a)
data sheet 340khz, 3a synchronous dc-dc buck converter ap3503 may. 2012 rev. 1. 7 bcd semiconductor manufacturing limited 7 typical performance characteristics (continued) t a =25oc, v in =12v, v out =3.3v, unless otherwise noted. figure 8. high-side switch on-resistance figure 9. low-side switch on-resistance vs. case temperature vs. case temperature figure 10. output ripple (i out =3a) figure 11. load transient (i out =1.5a to 3a) v in_ac 200mv/div v out_ac 20mv/div i l 2a/div v sw 10v/div time 4 s/div v out_ac 200mv/div i out 1a/div time 200 s/div -60 -40 -20 0 20 40 60 80 100 120 140 40 60 80 100 120 140 160 low-side switch on-resistance (m ? ) case temperature ( o c) -60 -40 -20 0 20 40 60 80 100 120 140 40 60 80 100 120 140 160 180 200 high-side switch on-resistance (m ? ) case temperature ( o c)
data sheet 340khz, 3a synchronous dc-dc buck converter ap3503 may. 2012 rev. 1. 7 bcd semiconductor manufacturing limited 8 typical performance characteristics (continued) t a =25oc, v in =12v, v out =3.3v, unless otherwise noted. figure 12. enable turn on characteristic figure 13. enable turn off characteristic (v in =12v, v en =3.3v, v out =3.3v, i l =3a) (v in =12v, v en =3.3v, v out =3.3v, i l =3a) figure 14. short circuit protection (i out =0a) figure 15. short circuit recovery (i out =0a) v out 2v/div i l 2a/div time 40 s/div i l 2a/div time 40 s/div v en 2v/div v ss 2v/div v out 2v/div i l 2a/div time 10ms/div time 200 s/div v en 2v/div v ss 2v/div v out 2v/div i l 2a/div v out 2v/div
data sheet 340khz, 3a synchronous dc-dc buck converter ap3503 may. 2012 rev. 1. 7 bcd semiconductor manufacturing limited 9 typical application c3 3.3nf c12 10f/25v c22 22f/25v d1 optional l 10h r4 100k r2 10k r1 26.1k r3 13k c6 optional c4 10nf c5 0.1f 3 5 1 6 7 8 2 4 ap3503 bs in sw gnd fb comp en ss c21 22f/25v c11 10f/25v input voltage=12v output voltage=3.3v figure 16. typical application of ap3503
data sheet 340khz, 3a synchronous dc-dc buck converter ap3503 may. 2012 rev. 1. 7 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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