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data sheet 1.1mhz, 650ma synchr onous dc-dc buck converter ap3406 oct. 2009 rev. 1. 4 bcd semiconductor manufacturing limited 1 general description the ap3406 is a 1.1mhz fixed frequency, current mode, pwm synchronous buck (step-down) dc-dc converter, capable of driving a 650ma load with high efficiency, excellent line and load regulation. the device integrates a main switch and a synchronous switch without an external schottky diode. it is ideal for powering portable equipment that runs from a single li-ion battery. a standard series of indu ctors are available from several different manufacturers optimized for use with the ap3406. this feature greatly simplifies the design of switch-mode power supplies. this ic is available in tsot-23-5 and sot-23-5 packages. features ? high efficiency: up to 95% ? output current: 650ma ? input voltage range: 2.5v to 5.5v ? fixed 1.1mhz frequency ? current mode control ? 100% duty cycle in dropout ? built-in short circuit protection ? built-in thermal shutdown function ? built-in current limit function ? shutdown current: <1 a applications ? gps ? wifi card ? portable media player ? digital still and video cameras figure 1. package types of ap3406 tsot-23-5 sot-23-5
data sheet 1.1mhz, 650ma synchr onous dc-dc buck converter ap3406 oct. 2009 rev. 1. 4 bcd semiconductor manufacturing limited 2 en sw gnd vin fb 1 2 34 5 pin configuration kt/k package tsot-23-5/sot-23-5 figure 2. pin configuration of ap3406 (top view) pin description pin number pin name function 1 en control input pin. forcing this pin above 1.5v enables the ic. forcing this pin below 0.6v shuts down the ic. when the ic is in shutdown mode, all functions are disabled to decrease the supply current below 1 a 2 gnd ground pin 3 sw power switch output pin. inductor connection to drain of the internal pfet and nfet switches 4 vin supply input pin. bypass to gnd with a 4.7 f or greater ceramic capacitor 5 fb feedback pin. connect it with an external resistor divider network to program the system output voltage
data sheet 1.1mhz, 650ma synchr onous dc-dc buck converter ap3406 oct. 2009 rev. 1. 4 bcd semiconductor manufacturing limited 3 functional block diagram figure 3. functional block diagram of ap3406 ordering information ap3406 - g1: green circuit type package kt: tsot-23-5 k: sot-23-5 adj: adjustable voltage part number marking id package temperature range green green packing type tsot-23-5 -40 to 85 c AP3406KT-ADJTRG1 l1b tape & reel sot-23-5 -40 to 85 c ap3406k-adjtrg1 fbc tape & reel bcd semiconductor's pb-free products, as designated with "g1" suffix in the part number, are rohs compliant and green. tr: tape & reel shutdown control slope compensation oscillator v ref with soft start pwm comparator control logic current limit detector current sense driver over temperature detector error amplifier 0.6v en vin sw gnd fb 1 2 3 4 5
data sheet 1.1mhz, 650ma synchr onous dc-dc buck converter ap3406 oct. 2009 rev. 1. 4 bcd semiconductor manufacturing limited 4 absolute maximum ratings (note 1) parameter symbol value unit input voltage v in -0.3 to 6 v feedback voltage v fb -0.3 to v in +0.3 v en pin voltage v en -0.3 to v in +0.3 v sw pin voltage v sw -0.3 to v in +0.3 v tsot-23-5 250 thermal resistance ja sot-23-5 265 oc/w operating junction temperature t j 125 oc storage temperature t stg -65 to 150 oc lead temperature (soldering, 10sec) t lead 260 oc 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 2.5 5.5 v maximum output current i out (max) 650 ma operating ambient temperature t a -40 85 oc
data sheet 1.1mhz, 650ma synchr onous dc-dc buck converter ap3406 oct. 2009 rev. 1. 4 bcd semiconductor manufacturing limited 5 electrical characteristics v in =v en =3.6v, t a =25 , unless otherwise specified. specifications with boldface type apply over full operating temperature range from -40 to 85oc. parameters symbol conditions min typ max unit supply current i cc v fb =0.55v 400 600 a shutdown supply current i shdn v en =0v, v in =5.5v 0.01 1 a under voltage lockout threshold v uvlo rising edge 2.27 v under voltage lockout hysteresis v huvlo 200 mv feedback bias current i fb v fb =0.65v -50 0.5 50 na feedback voltage v fb i out =100ma 0.588/ 0.582 0.600 0.612/ 0.618 v v in =2.5v, v out =0.9v 650 v in =3.6v, v out =1.2v 650 maximum output current i out (max) v in =4.6v, v out =3.3v 650 ma switch current limit i lim v fb =0.55v 0.8 1.15 a oscillator frequency f osc 0.8 1.1 1.4 mhz v enl 0.6 en pin threshold v enh 1.5 v i h v en =3.6v -0.1 0.1 a en pin input leakage current i l v en =0v -0.1 0.1 a internal pfet on resistance r dsonp i sw =100ma 0.44 ? internal nfet on resistance r dsonn i sw =-100ma 0.29 ? maximum duty cycle d max v fb =0.55v 100 % soft-start time t ss v en =0v to v in i out 50ma 220 s thermal shutdown threshold t otsd 160 oc thermal shutdown hysteresis t hys 30 oc sot-23-5 70 thermal resistance (junction to case) jc tsot-23-5 70 oc/w
data sheet 1.1mhz, 650ma synchr onous dc-dc buck converter ap3406 oct. 2009 rev. 1. 4 bcd semiconductor manufacturing limited 6 typical performance characteristics l=10 h, c out =10 f, t a =25 o c, unless otherwise noted. figure 4. frequency vs. input voltage figure 5. supply current vs. temperature figure 6. current limit vs. temperature figure 7. output volt age vs. output current -60 -40 -20 0 20 40 60 80 100 0.2 0.3 0.4 0.5 0.6 0.7 supply current (ma) temperature ( o c) v in =3.6v v fb =0.55v 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 0.8 0.9 1.0 1.1 1.2 1.3 1.4 frequency (mhz) input voltage (v) v in =3.6v v out =1.8v i out =0a -60 -40 -20 0 20 40 60 80 100 0.8 0.9 1.0 1.1 1.2 1.3 1.4 current limit (a) temperature ( o c) v in =3.6v v fb =0.55v 0 200 400 600 800 1000 1200 1.45 1.50 1.55 1.60 1.65 1.70 1.75 1.80 1.85 1.90 output voltage (v) output current (ma) v in =3.6v v out =1.8v
data sheet 1.1mhz, 650ma synchr onous dc-dc buck converter ap3406 oct. 2009 rev. 1. 4 bcd semiconductor manufacturing limited 7 typical performance characteristics (continued) 400ns/div 400ns/div 400ns/div figure 8. light load operation figure 9. heavy load operation (v in =3.6v, v out =1.8v, i out =0ma) ( v in =3.6v, v out =1.8v, i out =600ma) 200 s/div 200 s/div figure 10. load transient figure 11. start up from shutdown (v in =3.6v, v out =1.8v, i out =0ma to 500ma) (v in =3.6v, v out =1.8v, r load =4 ? ) v sw 2v/div v out 20mv/div v sw 2v/div v out 20mv/div i out 500ma/div v out 100mv/div i in 500ma/div v out 1v/div v en 5v/div
data sheet 1.1mhz, 650ma synchr onous dc-dc buck converter ap3406 oct. 2009 rev. 1. 4 bcd semiconductor manufacturing limited 8 typical performance characteristics (continued) 4 s/div 80 s/div figure 12. short circuit protection figure 13. short circuit recovery (v in =3.6v, v out =1.8v, no load) (v in =3.6v, v out =1.8v, no load) fi gure 14. efficiency vs. output current figure 15. efficiency vs. output current v out 1v/div v sw 2v/div i l 500ma/div v out 1v/div v sw 2v/div i l 500ma/div 10 0 10 20 30 40 50 60 70 80 90 100 1000 l=2.2 h l=4.7 h l=10 h v in =4.2v v out =3.3v efficiency (%) output current (ma) 100 10 0 10 20 30 40 50 60 70 80 90 100 1000 v in =3.6v v out =1.8v efficiency (%) output current (ma) l=2.2 h l=10 h 100
data sheet 1.1mhz, 650ma synchr onous dc-dc buck converter ap3406 oct. 2009 rev. 1. 4 bcd semiconductor manufacturing limited 9 typical performance characteristics (continued) figure 16. normalized feedback voltage vs. temperature typical application figure 17. typical application of ap3406 -60 -40 -20 0 20 40 60 80 100 -2.0 -1.5 -1.0 -0.5 0.0 0.5 1.0 1.5 2.0 normalized feedback voltage ( % ) temperature ( o c) v in =3.6v v out =1.8v
data sheet 1.1mhz, 650ma synchr onous dc-dc buck converter ap3406 oct. 2009 rev. 1. 4 bcd semiconductor manufacturing limited 10 mechanical dimensions sot-23-5 unit: mm(inch)
data sheet 1.1mhz, 650ma synchr onous dc-dc buck converter ap3406 oct. 2009 rev. 1. 4 bcd semiconductor manufacturing limited 11 mechanical dimensions (continued) tsot-23-5 unit: mm(inch) 5 gauge plane
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 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 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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