ap3403 document number: ds36839 rev. 3 - 2 1 of 9 www.diodes.com may 2015 ? diodes incorporated ap3403 a product line of diodes incorporated new product 600ma step - down dc/dc converter with synchronous rectifier description the ap3403 is a 2.0mhz fixed frequency, current mode, pwm synchronous buck (step - down) dc - dc converter, capable of driving a 600ma load with high efficiency, excellent line and load regulation. the high efficiency is easily configured by using an inductor, resistors and capacitors as the external components. current mode control provides fast transient response and cycle - by - cycl e current limit. the ap3403 employs complete protection to ensure system security , i ncluding input under voltage lock out, over temperature protection and hiccup mode short circuit protection. this ic is available in u - dfn1616 - 6 package. features ? high efficiency buck power converter ? input voltage range : 2.3v to 5.5v ? output voltage range : 0.7v to 5.5v ? fixed 2.0mhz oscillator frequency ? built - in soft - start time ? built - in over current protection ? built - in thermal shutdown function ? built - in uvlo function ? hiccu p mode scp ? output current : 600ma ? package : u - dfn1616 - 6 ? totally lead - free & fully rohs compliant (notes 1 & 2) ? halogen and antimony free. green device (note 3 ) pin assignments (top view) u - dfn1616 - 6 (type g) applications ? post dc - dc voltage regulation ? pda and notebook computer 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. typical applications circuit 1 p i n 1 m a r k 2 3 6 5 4 e p e n a g n d p g n d f b v i n s w l 2 . 2 h v i n c i n 4 . 7 f o n / o f f v i n e n s w f b a g n d p g n d v o u t 1 . 8 v c o u t 1 0 f r 1 2 4 0 k r 2 1 2 0 k c f f 2 2 p f a p 3 4 0 3 1 2 3 4 5 6
ap3403 document number: ds36839 rev. 3 - 2 2 of 9 www.diodes.com may 2015 ? diodes incorporated ap3403 a product line of diodes incorporated new product pin description s pin number pin name function 1 en control input pin. en is a digital input that turns the regulator on or off. drive en high to turn the regulator on. drive low to turn the regulator off. 2 agnd signal ground pin 3 pgnd power ground pin 4 sw power switch output pin. this pin is connected to the inductor. 5 vin supply power input pin. a capacitor should be connected between v in pin and gnd - to keep the input voltage constant. 6 fb feedback pin. this pin is connected to an external resistor divider to program the system output voltage. functional block diagram 1 6 3 4 s w p g n d e r r o r a m p l i f i e r f b e n p w m c o m p a r a t o r b u f f e r & d e a d t i m e c o n t r o l l o g i c c o n t r o l l o g i c c u r r e n t s e n s i n g r e v e r s e i n d u c t o r c u r r e n t c o m p a r a t o r v i n o v p c o m p a r a t o r o s c i l l a t o r s l o p e c o m p e n s a t i o n o c p c o m p a r a t o r s o f t s t a r t b i a s g e n e r a t o r s h u t d o w n c o m p a r a t o r b a n d g a p r e f e r e n c e u v l o 5 v i n 2 a g n d
ap3403 document number: ds36839 rev. 3 - 2 3 of 9 www.diodes.com may 2015 ? diodes incorporated ap3403 a product line of diodes incorporated new product absolute maximum ratings ( note 4 ) symbol parameter rating unit v in vin input voltage - 0.3 to 6.5 v v sw sw pin voltage - 0.3 to v in + 0.3 v v en e n pin input voltage - 0.3 to 6.5 v v fb vfb pin voltage - 0.3 to 6.5 v i sw sw pin output current 1 a p d power dissipation (standard land pattern) 640 mw t stg storage temperature range - 55 to + 125 c v hbm esd (human body model) 2000 v note 4 : stresses greater than those listed under absolute maximum ratings may cause permanent damage to the device. these are stres s ratings only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operati ng conditions is not implied. exposure to absolute maximum ratings for extended periods may affect device reliability . recommended operating conditions (@ t a = +25c, unless otherwise specified.) symbol parameter min max unit v in input voltage 2.3 5.5 v t a operating ambient temperature - 40 + 85 oc
ap3403 document number: ds36839 rev. 3 - 2 4 of 9 www.diodes.com may 2015 ? diodes incorporated ap3403 a product line of diodes incorporated new product electrical characteristics ( v in = v en = 3.6v (v out 2.6v), v in = v en = v out +1v (v out > 2.6v), unless otherwise specified. specification with standard typeface are for t a = + 25oc, and those in boldface type apply over the full operating temperature rang (t a = - 40oc to +85oc) ) symbol parameter conditions min typ max unit v in input voltage 1.0v v out 2.3 C 5.5 v 0.9v v out < 1.0v 2.3 C 5.25 0.7v v o ut < 0.9v 2.3 C 4.5 i dd supply current v in = v en = v fb = 3.6v C 32 45 a i stdb standby current v in = 5.5v, v en = 0v C 0 5 a v uvlo input uvlo threshold v in rising 2.0 2. 1 2. 2 v v hys input uvlo hysteresis C C 0.1 C v v enh en active threshold voltage v in = 5.5v 1.0 C C v v enl en shutdown threshold voltage v in = 2.3v C C 0.4 v v fb feedback voltage v in = v en = 3.6v 0.591 0.600 0.609 v i fbh fb high input current v in = v fb = 5.5v v en = 0v - 1 0 1 a i fbl fb low input current v en = v fb = 0v v in = 5.5v - 1 0 1 a r on h high - side switch on - resistance v in = 3.6v i sw = 100ma C 380 C m r on l low - side switch on - resistance v in = 3.6v i sw = 100ma C 300 C m i limh sw current limit v in = v en = 3.6v 800 1000 C ma f osc oscillator frequency C 1.7 2.0 2.3 mhz d max max. duty cycle C 100 C C % t otsd thermal shutdown C C + 140 C oc t hys thermal shutdown hysteresis C C + 40 C oc t ss soft - start time v in = v en = 3.6v C 150 300 s
ap3403 document number: ds36839 rev. 3 - 2 5 of 9 www.diodes.com may 2015 ? diodes incorporated ap3403 a product line of diodes incorporated new product performance characteristics ( t a = + 25oc, v in = 3.6 v, v out = 1.8 v, unless otherwise specified. ) efficiency vs. output current output voltage vs. output current supply current vs. input voltage feedback voltage vs. temperature pmos r dson vs. t emperature nmos r dson vs. t emperature -50 0 50 100 150 200 250 300 350 400 450 500 550 600 650 0 10 20 30 40 50 60 70 80 90 100 efficiency (%) output current (ma) v out = 1.8v 0 100 200 300 400 500 600 1.775 1.780 1.785 1.790 1.795 1.800 1.805 1.810 1.815 output voltage (v) output current (ma) v in = 3.6v -40 -20 0 20 40 60 80 100 120 140 0.50 0.52 0.54 0.56 0.58 0.60 0.62 0.64 0.66 0.68 feedback voltage (v) temperature ( o c) v in = 3.6v, test mode 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 30 32 34 36 38 40 42 44 46 48 50 supply current ( ? a) input voltage (v) v out = 1.8v, i out = 0a -60 -40 -20 0 20 40 60 80 100 120 140 240 260 280 300 320 340 360 380 400 420 440 pmos r dson (m ? ) temperature ( o c) i sw = 100ma -60 -40 -20 0 20 40 60 80 100 120 140 180 200 220 240 260 280 300 320 340 360 nmos r dson (m ? ) temperature ( o c) i sw = 100ma
ap3403 document number: ds36839 rev. 3 - 2 6 of 9 www.diodes.com may 2015 ? diodes incorporated ap3403 a product line of diodes incorporated new product performance characteristics (cont. t a = + 25oc, v in = 3.6 v, v out = 1.8 v, unless otherwise specified. ) output ripple (i o ut = 0a) output ripple (i o ut = 0.6a) enable turn on characteristic enable turn off characteristic (resistance load, r load = 3) (resistance load, r load = 3) short current protection scp recovery (resistance load, r load =3) (resistance load, r load = 3) v sw 5v/div v out - ac 20mv/div i l 500ma/div v sw 2v/div v out - ac 20mv/div i l 500ma/div v en 2v/div v out 2v/div v sw 1v/div v en 2v/div v out 2v/div v sw 1v/div v out 1v/div i l 500ma/div v sw 2v/div v out 1v/div i l 500ma/div v sw 2v/div time 1.6ms/div time 1 s/div time 50 s/div time 50 s/div time 200 s/div time 200 s/div
ap3403 document number: ds36839 rev. 3 - 2 7 of 9 www.diodes.com may 2015 ? diodes incorporated ap3403 a product line of diodes incorporated new product application information please refer to the typical a pplication s c ircuit, and to set the circuit parameters please refer to the following descriptions. under voltage lockout (uvlo) circuit when the v in drops lower than the uvlo detector threshold, the uvlo circuit starts to operate, v ref stops, and high - side switch and low - side switch built - in switch transistors turn off. as a result, v out drops according to the c out capacitance value and the load. wh en the v in is rising higher than uvlo released voltage, the ic will restart the operation. short circuit protection and recovery when the ap3403 output node is shorted to gnd, as v fb drops under 0. 3 v, the chip will enter hiccup mode to protect itself, when short circuit is removed, and v fb rises over 0.4v, the ap3403 recovers to normal operation again. if the ap3403 reaches ocp threshold while short circuit, the ap3403 will enter cycle by cycle current limit mode until the current under ocp threshold. input over voltage protection when input voltage of ap3403 is near 6.25v, the ic will enter input - over - voltage - protection. it would be shut down and there will be no output voltage in this state. as the input voltage goes down below 6v, it will leave input ovp and recover the output voltage. over temperature protection the internal thermal temperature protection circuitry is provided to protect the integrated circuit in the event that the max imum junction temperature is exceeded. when the junction temperature exceeds + 140 oc , it shuts down the internal control circuit and switching power mosfet. the ap3403 will restart automatically under the control of soft start circuit when the junction temperature decreases to + 100 oc . ordering information part number package code packaging 7 tape and reel quantity part number suffix a p3403flj - 7 flj u - dfn1616 - 6 3000/tape & reel - 7 mark ing informatio n u - dfn1616 - 6 (type g) part number package identification code ap3403flj - 7 u - dfn1616 - 6 de a p 3 4 0 3 f l j - 7 p a c k i n g p a c k a g e 7 : t a p e & r e e l f l j : u - d f n 1 6 1 6 - 6 ( t o p v i e w ) x x y : y e a r : 0 ~ 9 x : i n t e r n a l c o d e x x : i d e n t i f i c a t i o n c o d e w : w e e k : a ~ z : 1 ~ 2 6 w e e k ; a ~ z : 2 7 ~ 5 2 w e e k ; z r e p r e s e n t s 5 2 a n d 5 3 w e e k y w x
ap3403 document number: ds36839 rev. 3 - 2 8 of 9 www.diodes.com may 2015 ? diodes incorporated ap3403 a product line of diodes incorporated new product package outline dimensions (all d imensions in mm (inch) . ) please see ap02002 at http://www.diodes.com/datasheets/ap02002.pdf for the latest version. (1) package type: u - dfn1616 - 6 (type g) u - dfn 1616 - 6 (type g) dim min max typ a 0.50 ? 0. 60 0.56 ? 0 .00 0.05 0.0 2 a3 - - - - 0.203 b 0. 15 0. 25 0. 20 d 1. 55 1.65 1.60 d2 1.20 1.40 1.30 e -- -- 0.50 e 1. 5 5 1.65 1.60 e2 0.60 0.80 0.70 k -- -- 0.20 l 0. 20 0. 30 0. 25 z -- -- 0.20 all dimensions in mm suggested pad layout please see ap02001 at http://www.diodes.com/datasheets/ap02001.pdf for the latest version. (1) package t ype: u - dfn1616 - 6 (type g) dimensions value (in mm) c 0.500 g 0.150 x 0.300 x1 1.300 x2 1.300 y 0.450 y1 0.700 y2 1.900 d e e b l a a1 a3 z seating plane d2 e2 k c0.1 (pin #1 id) y2 x2 c y x1 y1 x g
ap3403 document number: ds36839 rev. 3 - 2 9 of 9 www.diodes.com may 2015 ? diodes incorporated ap3403 a product line of diodes incorporated new product important notice diodes 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 jurisd iction). 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 as sume 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 this doc ument 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. diod es incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel. should customers purchase or use diodes incorporated products for any unintended or unauthorized application, custo mers 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 una uthorized 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 foreign tra demarks. 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 incorporated products are specifically not authorized for use as critical components in life support devices or systems without the expres s written approval of the chief executive officer of diodes incorporated. as used herein: a. life support devices or systems 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 legal, 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 incor porated. 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. copyright ? 201 5 , diodes inc orporated www.diodes.com
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