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ap 3 409/a document numbe r: ds36789 rev. 2 - 2 1 of 11 www.diodes.com january 2014 ? diodes inc orporated ap3 409/a a product line of diodes incorporated 3a, 4mhz high efficiency synchronous buck converter description the ap3409/a is a current mode, pwm synchronous buck dc/dc converter, capable of driving a 3a load with high efficiency, excellent line and load regulation. it operates in con tinuous pwm mode. the ap3409/a integrates synchronous p - channel and n - channel power mosfet switches with low on - resistance. it is ideal for portable applications powered from a single li - ion battery. 100% duty cycle and low on - resistance p - channel interna l power mosfet can maximize the battery life. the switching frequency of ap3409/a can be programmable from 300khz to 4mhz, which allows small - sized components, such as capacitors and inductors. a standard series of inductors from several different manufac turers are available. this feature greatly simplifies the design of switch - mode power supplies. the ap3409/a is available in u - dfn3030 - 10 package. features ? input voltage range: 2.6 v to 5.5v ? adjustable output from 0.8 v to 5v ? 0.8v reference vol tage with 2% precision ? output current: 3a ? high efficiency up to 95% ? low r dson internal switches ? programmable frequency: 300khz to 4mhz ? current mode control ? forced continuous - mode operation ? 100% duty cycle ? built - in soft - start ? built - in short circuit prote ction ? built - in thermal shutdown protection ? built - in current limit function ? pgood output voltage monitoring (for ap3409a) ? u - dfn3030 - 10 package ? totally lead - free & fully rohs compliant (note 1 & 2) ? halogen and antimony free. green device (note 3) pin assignments (top view) u - dfn3030 - 10 ( dn package) for ap3409 (top view) u - dfn3030 - 10 ( d n package) for ap3409a applications ? portable media player ? digital still and video cameras ? notebook note s: 1 . no purposely added lead. fully eu directive 2002/95/ec (rohs) & 2011/65/eu (rohs 2) compliant. 2. see http://www.diodes.com/quality/lead_free.html for more information about diodes incorporateds definitions of hal ogen - and antimony - free, "green " and lead - f ree . 3. halogen - and antimony - free "green products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total br + cl) and <1000ppm antimony compounds . shdn / rt gnd sw sw pgnd comp fb vdd pvdd pvdd pin 1 mark 1 2 3 4 5 6 7 8 9 10 exposed pad connected to pgnd shdn / rt gnd sw sw pgnd comp fb pgood vdd pvdd pin 1 mark 1 2 3 4 5 6 7 8 9 10 exposed pad connected to pgnd
ap 3 409/a document numbe r: ds36789 rev. 2 - 2 2 of 11 www.diodes.com january 2014 ? diodes inc orporated ap3 409/a a product line of diodes incorporated typical applications circu it (note 4 ) typical application of ap3409 typical application of ap3409a note s 4 : a p 3 4 0 9 a s h d n / r t g n d s w p g n d c o m p f b p g o o d v d d ( p v d d ) v i n 5 v r o s c 3 3 0 k l 1 2 . 0 m h c i n 2 2 m f c 1 2 2 p f c o u t 2 2 m f 2 r 1 5 1 0 k r 2 2 4 0 k c c o m p 1 0 0 0 p f r c o m p 3 0 k v o u t 2 . 5 v / 3 a r 4 1 0 0 k a p 3 4 0 9 s h d n / r t g n d s w p g n d c o m p f b v d d p v d d v i n 5 v r o s c 3 3 0 k l 1 2 . 0 m h c i n 2 2 m f c 1 2 2 p f c o u t 2 2 m f 2 r 1 5 1 0 k r 2 2 4 0 k c c o m p 1 0 0 0 p f r c o m p 3 0 k v o u t 2 . 5 v / 3 a 2 ) 2 1 ( r r r v v fb out ? ? ?
ap 3 409/a document numbe r: ds36789 rev. 2 - 2 3 of 11 www.diodes.com january 2014 ? diodes inc orporated ap3 409/a a product line of diodes incorporated pin description s pin number p in name function ap3409 ap3409a 1 1 shdn/rt os cillator resistor input. connect a resistor to gnd from this pin to set the switching frequency. forcing this pin to v dd to shutdown the device 2 2 gnd signal ground. all small - signal ground, such as the compensation components and exposed pad should be connected to this, which in turn connects to pgnd at one point 3 , 4 3, 4 sw internal power switch output. connect this pin with one terminal of the inductor 5 5 pgnd power ground. connect this pin as close as possible to c in and c out 6, 7 6 pvdd powe r input supply. decouple this pin to pgnd with a capacitor 8 7 vdd signal input supply. decouple this pin to gnd with a capacitor. normally v dd is equal to v pvdd C 8 pgood power good indicator. this pin is open - drain logic output that is pulled to groun d when the output voltage is not within 12.5% of regulation point 9 9 fb feedback voltage. this pin is the inverting input of internal error amplifier. it senses the converter output voltage through an external resistor divider. the internal reference vo ltage is 0.8v, which determines the output voltage through the resistor divider 10 10 comp compensation input. this pin is the output of internal error amplifier. connect external compensation elements to this pin to stabilize the control loop functio nal block diagram functional block diagram of ap3409 s d o s c i l l a t o r s u m c s 0 . 8 v e a o c p d r i v e r c o n t r o l l o g i c o t p u v l o v r e f 0 . 4 v s h d n / r t p v d d s w g n d p g n d v d d f b c o m p 1 2 1 0 3 , 4 5 6 , 7 8 9 p w m c l a m p s s d c
ap 3 409/a document numbe r: ds36789 rev. 2 - 2 4 of 11 www.diodes.com january 2014 ? diodes inc orporated ap3 409/a a product line of diodes incorporated functional block diagram (cont.) functional block diagram of ap3409 a absolute maximum ratings ( note 5 ) symbol parameter rating unit v dd vdd pin voltage - 0.3 to 6 v v pvdd pvdd pin voltage - 0.3 to 6 v v fb fb pin voltage - 0.3 to 6 v v comp comp pin voltage - 0.3 to 6 v v sw sw pin voltage - 0.3 to v in +0.3 v v rt shdn/rt pin voltage - 0.3 to 6 v ja thermal resistance (junction to a mbient) 110 oc/w jc thermal resistance (junction to case) 3 oc/w t j operating junction temperature + 150 oc t stg storage temperature - 65 to + 150 oc t lead lead temperature (soldering, 10 sec) + 260 oc C esd (machine model) 200 v C esd (human body model ) 2000 v note 5 : stresses greater than those listed under absolute maximum ratings may cause permanent damage to the device. these are str ess ratings only, and functional operation of the device at these or any other conditions beyond those indicated u nder recommended operating conditions is not implied. exposure to absolute maximum ratings for extended periods may affect device reliability. s d o s c i l l a t o r s u m c s 0 . 8 v e a o c p d r i v e r c o n t r o l l o g i c o t p u v l o 0 . 4 v s h d n / r t p v d d s w g n d p g n d v d d f b c o m p 1 2 1 0 3 , 4 5 6 7 9 p w m c l a m p s s d c 8 p g o o d v r e f 0 . 7 2 5 v 0 . 9 v
ap 3 409/a document numbe r: ds36789 rev. 2 - 2 5 of 11 www.diodes.com january 2014 ? diodes inc orporated ap3 409/a a product line of diodes incorporated recommended operating conditions symbol parameter min max unit v in input voltage 2.6 5.5 v i out (max ) maximum output current 3 C a t j operating junction temperature - 40 + 125 oc electrical characteristics ( v in =v dd =v pvdd = 3.3 v, t a = + 25 o c , unless otherwise specified .) symbol parameter conditions min typ max unit input section v dd input voltage range 2.6 C 5.5 v i q supply current v fb =0.75v, no switching C 460 C a i shdn shutdown supply current shutdown, v in =5.5v C C 1 a v uvlo under voltage threshold lockout v dd rising C 2.2 C v v huvlo under voltage hysteresis lockout C C 300 C mv feedback sectio n v fb feedback voltage C 0.784 0.8 0.816 v i fb fb pin bias current C C 0.1 0.4 a r t current sense trans - resistance C C 0.2 C C switching leakage current v shdn/rt =v in =5.5v C C 1 a g v error gain amplifier voltage C C 800 C C g s error amplifier trans - conductance C C 800 C a /v oscillator section v rt rt pin voltage C 0.76 0.8 0.84 v f osc switching frequency r osc 0.8 1 1.2 mhz adj frequency 0.3 C 4 mhz d max maximum duty cycle v fb =0.75v 100 C C % power switch section i limit switch current limit ap3409 v fb =0.75v 3.2 4.2 C a ap3409a 3.5 4.2 C a r pdson internal p - fet on resistance i sw =500ma C 0.11 0.16 r ndson internal n - fet on resistance i sw = - 500ma C 0.11 0.17 shdn/rt section C shutdown threshold C C v dd - 0.7 v dd - 0 .4 v pgood section (only for ap3409a) C pgood voltage range C C 12.5 15 % C pgood pull down resistance C C C 120 total device i out output current v dd =2.6 v to 5.5v , v out =2.5v 3 C C a lnr output voltage line regulation v dd =2.7 v to 5.5v , i out =100 ma C 0.4 C %/v lod output voltage load regulation i out =0.01 a to 3a C 0.2 C % t ss soft - start time i out 10ma C 1.5 C ms t otsd thermal shutdown temperature C C + 160 C oc t hys thermal shutdown temperature hysteresis C C + 20 C oc
ap 3 409/a document numbe r: ds36789 rev. 2 - 2 6 of 11 www.diodes.com january 2014 ? diodes inc orporated ap3 409/a a product line of diodes incorporated performance characterist ics ( v in =v dd =v pvdd =3.3v, t a = + 25 o c , unless otherwise specified .) supply current vs. input voltage supply current vs. ambient temperature efficiency vs. output current pmos on resistance vs. ambient temperature nmos on resistance vs. am bient temperature frequency vs. ambient temperature -60 -30 0 30 60 90 120 150 60 80 100 120 140 pmos on resistance ( m ? ) ambient temperature ( o c ) v in =3.3v v fb =0.75v -60 -30 0 30 60 90 120 150 60 80 100 120 140 nmos on resistance ( m ? ) ambient temperature ( o c ) v in =3.3v v fb =0.85v -60 -30 0 30 60 90 120 150 100 200 300 400 500 600 700 supply current ( m a ) ambient temperature ( o c ) v in =3.3v v fb =0.75v -60 -30 0 30 60 90 120 150 0.7 0.8 0.9 1.0 1.1 1.2 frequency (mhz) ambient temperature ( o c ) v in =3.3v v out =2.5v 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 100 200 300 400 500 600 supply current ( m a ) input voltage (v) v fb =0.75v 0 500 1000 1500 2000 2500 3000 3500 30 40 50 60 70 80 90 100 efficiency (%) output current (ma) v out =2.5v v in =5.0v v in =3.3v
ap 3 409/a document numbe r: ds36789 rev. 2 - 2 7 of 11 www.diodes.com january 2014 ? diodes inc orporated ap3 409/a a product line of diodes incorporated performance characteristics ( cont. v in =v dd =v pvdd =3.3v, t a = + 25 o c , unless otherwise specified .) v fb vs. ambient temperature current limit vs. ambient temperature s tart - up from vin (v in =3.3v , v out =2.5v, i out =3a) load transient response (v in =3.3v , v out =2.5v, i out = 0.5 a to 3a) short circuit protection (v in =3 .3v, v out =2.5v) short circuit recovery (v in =3.3v, v out =2.5v) v out (ac) 50m v /div i out 1a/div time 200 m s/div v sw 2v /div v out 2v /div i l 2 a/div time 1ms/div v out 1 v /div i out 1a/div time 4ms/div v out 1 v /div i out 1a/div time 4ms/div -60 -30 0 30 60 90 120 150 2 3 4 5 current limit (a) ambient temperature ( o c ) v in =3.3v v fb =0.75v -60 -30 0 30 60 90 120 150 0.5 0.6 0.7 0.8 0.9 v fb (v) ambient temperature ( o c ) v in =3.3v v out =2.5v
ap 3 409/a document numbe r: ds36789 rev. 2 - 2 8 of 11 www.diodes.com january 2014 ? diodes inc orporated ap3 409/a a product line of diodes incorporated ordering information diodes ics p b - free products with "g1" suffix in the part number, are rohs compliant and green . package temperatur e range part number marking id packing u - dfn3030 - 10 - 40 to + 125 ? c ap3409 dn tr - g1 bda 5000/ tape & reel ap340 9a dn tr - g1 bca 5000/ tape & reel mark ing information ap3409 ( top view) ap3409a ( top view) first line : logo and marking id second and third line s : date code y: year ww: work week of molding a: assembly house code xx: 7 th and 8 th digits of batch no. first line : logo and marking id second and third line s : date code y: year ww: work week of molding a: assembly house code xx: 7 th and 8 th digits of batch no. a p 3 4 0 9 x x x x x - x x p a c k i n g v e r s i o n t r : t a p e & r e e l a : a p 3 4 0 9 a g 1 : g r e e n p r o d u c t n a m e r o h s / g r e e n p a c k a g e d n : u - d f n 3 0 3 0 - 1 0 b l a n k : a p 3 4 0 9
ap 3 409/a document numbe r: ds36789 rev. 2 - 2 9 of 11 www.diodes.com january 2014 ? diodes inc orporated ap3 409/a a product line of diodes incorporated package outline dimensions (all d imensions in mm ( inch ) . ) (1) package t ype: u - dfn3030 - 10 2 . 9 0 0 ( 0 . 1 1 4 ) 3 . 1 0 0 ( 0 . 1 2 2 ) 2 . 9 0 0 ( 0 . 1 1 4 ) 3 . 1 0 0 ( 0 . 1 2 2 ) 1 . 5 0 0 ( 0 . 0 5 9 ) 1 . 8 0 0 ( 0 . 0 7 1 ) 0 . 2 0 0 ( 0 . 0 0 8 ) 0 . 3 0 0 ( 0 . 0 1 2 ) 0 . 5 0 0 ( 0 . 0 2 0 ) t y p 0 . 2 5 0 ( 0 . 0 1 0 ) 0 . 5 5 0 ( 0 . 0 2 2 ) 0 . 0 0 0 ( 0 . 0 0 0 ) 0 . 0 5 0 ( 0 . 0 0 2 ) 2 . 3 0 0 ( 0 . 0 9 0 ) 2 . 5 0 0 ( 0 . 0 9 8 ) n 1 n 5 n 6 n 1 0 p i n 1 m a r k p i n # 1 i d e n t i f i c a t i o n s e e d e t a i l a 1 2 d e t a i l a 1 2 1 2 p i n 1 o p t i o n s s y m b o l a m i n ( m m ) m a x ( m m ) m i n ( i n c h ) m a x ( i n c h ) o p t i o n 1 o p t i o n 2 0 . 7 0 0 0 . 5 7 0 0 . 8 0 0 0 . 6 3 0 0 . 0 2 8 0 . 0 2 2 0 . 0 3 1 0 . 0 2 5 a 3 m i n ( m m ) m a x ( m m ) m i n ( i n c h ) m a x ( i n c h ) 0 . 1 5 3 0 . 1 5 0 ( t y p ) 0 . 2 5 3 0 . 0 0 6 0 . 0 0 6 ( t y p ) 0 . 0 1 0 a a 3
ap 3 409/a document numbe r: ds36789 rev. 2 - 2 10 of 11 www.diodes.com january 2014 ? diodes inc orporated ap3 409/a a product line of diodes incorporated suggested pad layout (1) package t ype: u - dfn3030 - 10 dimensions y (mm)/(inch) x1 (mm)/(inch) y1 (mm)/(inch) x2 (mm)/(inch) y2 (mm)/(inch) e (mm)/(inch) value 3.300/0.130 0.300/0.012 0.600/0.024 2.600/0.102 1.800/0.071 0.500/0.020 x 1 y 1 x 2 y 2 y e
ap 3 409/a document numbe r: ds36789 rev. 2 - 2 11 of 11 www.diodes.com january 2014 ? diodes inc orporated ap3 409/a a product line of diodes incorporated important notice d iodes incorporated makes no warranty of any kind, express or implied, with regards to this document, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose (and their equivalents under the laws of any jurisdiction). diodes incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to this document and any product described herein. diodes incorporated does not assume any liability arising out of the application or use of this document or any product described herein; neither does diodes incorporated convey any license unde r its patent or trademark rights, nor the rights of others. any customer or user of th is document or products described herein in such applications shall assume all risks of such use and will agree to hold diodes incorporated and all the companies whose products are represented on diod es incorporated website, harmless against all damages. diodes incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthor ized sales channel. should customers purchase or use diodes incorporated products for any unintended or unauthorized application, customers shall indemnify and hold diodes incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising ou t of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized application. products described herein may be covered by one or more united states, international or foreign patents pending. product nam es and markings noted herein may also be covered by one or more united states, international or forei gn trademarks. this document is written in english but may be translated into multiple languages for reference. only the english version of this document is the final and determinative format released by diodes incorporated. life support diodes incorpo rated products are specifically not authorized for use as critical components in life support devices or systems without the express written approval of the chief executive officer of diodes incorporated. as used herein: a. life support devices or syste ms are devices or systems which: 1. are intended to implant into the body, or 2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided i n the labeling can be reasonably expected to result in significant injury to the user. b. a critical component is any component in a life support device or system whose failure to perform can be reasonably expe cted to cause the failure of the life support device or to affect its safety or effectiveness. customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support d evices or systems, and acknowledge and agree that they are solely responsible for all lega l, regulatory and safety - related requirements concerning their products and any use of diodes incorporated products in such safety - critical, life support devices or systems, notwithstanding any devices - or systems - related information or support that may be provided by diodes incorporated. further, customers must fully indemnify diodes incorporated and its representatives against any damages arising out of the use of diodes incorporated products in such safety - critical, life support devices or systems. cop yright ? 2012, diodes incorporated www.diodes.com

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