AP3405 document number: ds 38093 rev. 1 - 2 1 of 9 www.diodes.com january 2016 ? diodes incorporated advanced information ap34 05 600ma step - down dc/dc converter with synchronous rectifier description the ap340 5 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 l ine 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 - cycle current limit. the ap340 5 employs complet e protection to ensure system security, i ncluding input under v oltage lock o ut, over - temperature protection and hiccup mode short circuit protection. this ic is available in u - dfn 2020 - 8 package. features ? high - efficiency buck power converter ? inp ut voltage range : 2.3v to 5.5v ? output voltage range : 0.7v to 5.5v ? fixed 2.0mhz oscillator frequency ? built - in soft - s tart time ? built - in over c urrent protection ? built - in thermal shutdown function ? built - in uvlo function ? hiccup mode scp ? output current : 600ma ? package : u - dfn2020 - 8 (type e) ? totally lead - free & fully rohs compliant (notes 1 & 2) ? halogen and antimony free. green device (note 3 ) pin assignments (top view) u - dfn 2020 - 8 (type e) applications ? post dc - dc voltage regulation ? mobile phones and wearable devices 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 diod es 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 ant imony compounds. typical applications circuit 1 p i n 1 m a r k 2 4 8 7 5 e p n c n c p g n d e n f b s w 3 6 a g n d v i n 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 5 8 3 4 5 6 7
AP3405 document number: ds 38093 rev. 1 - 2 2 of 9 www.diodes.com january 2016 ? diodes incorporated advanced information ap34 05 pin description s pin number pin name function 1 , 2 nc no connection 3 agnd signal ground pin 4 pgnd power ground pin 5 sw power switch output pin. this pin is connec ted to the inductor. 6 vin supply power input pin. a capacitor should be connected between v in pin and gnd - to keep the input voltage constant. 7 fb feedback pin. this pin is connected to an external resistor divider to program the system output voltage . 8 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. functional block diagram 8 7 4 5 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 6 v i n 3 a g n d
AP3405 document number: ds 38093 rev. 1 - 2 3 of 9 www.diodes.com january 2016 ? diodes incorporated advanced information ap34 05 absolute maximum ratings (@ t a = +25c, unless otherwise specified.) ( 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 cu rrent 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) 2 , 000 v note : 4. 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 operati ng conditions is not implied. exposur e 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 tem perature - 40 + 85 c
AP3405 document number: ds 38093 rev. 1 - 2 4 of 9 www.diodes.com january 2016 ? diodes incorporated advanced information ap34 05 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 = + 25 c, and those in boldface type apply over the full operating temperature rang e (t a = - 40 c to +85 c) ) symbol parameter conditions min typ max unit v in input voltage 1.0v v out 2.3 C 0.9v v out < 1.0v 2.3 C 0.7v v o ut < 0.9v 2.3 C dd supply current v in = v en = v fb = 3.6v C stdb standby current v in = 5.5v, v en = 0v C uvlo input uvlo threshold v in rising 2.0 2. 1 2. 2 v v hys input uvlo hysteresis C C C enh en active threshold voltage v in = 5.5v 1.0 C C enl en shutdown thre shold voltage v in = 2.3v C C 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 - s ide switch on - r esist ance v in = 3.6v i sw = 100ma C C m on l low - s ide switch on - r esistance v in = 3.6v i sw = 100ma C C m limh sw current limit v in = v en = 3.6v 800 1 , 000 C osc oscillator frequency C max max imum duty cycle C C C otsd thermal shutdown C C C hys thermal shutdown hysteresis C C C ss soft - s tart time v in = v en = 3.6v C
AP3405 document number: ds 38093 rev. 1 - 2 5 of 9 www.diodes.com january 2016 ? diodes incorporated advanced information ap34 05 performance characteristics ( t a = + 25 c, 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
AP3405 document number: ds 38093 rev. 1 - 2 6 of 9 www.diodes.com january 2016 ? diodes incorporated advanced information ap34 05 performance characteristics ( continued) ( t a = + 25 c, v in = 3.6 v, v out = 1.8 v, unless otherwise specified. ) outpu t ripple (i o ut = 0a) output ripple (i o ut = 0.6a) enable turn on characteristic enable turn off characteri stic (resistance load, r load = 3) (resistance load, r load = 3) short current protection scp recover y (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 2 v/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
AP3405 document number: ds 38093 rev. 1 - 2 7 of 9 www.diodes.com january 2016 ? diodes incorporated advanced information ap34 05 application information please refer to the typical a pplication s c ircuit, and to set the circuit parameters p lease refer to the following descriptions. under v oltage 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 transistor s turn off. as a result, v out drops according to the c out capacitance value and the load. when the v in is rising higher than uvlo released voltage, the ic will restart the operation. short circuit protection and recovery when the ap340 5 output node is s horted 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 ap340 5 recovers to normal operation again. if the ap340 5 reaches ocp threshold while short circuit, the a p340 5 will enter cycle - by - cycle current limit mode until the current under ocp threshold. input over v oltage protection when input voltage of ap340 5 is near 6.25v, the ic will enter input - over v oltage - protection. it would be shut down and there will b e 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 ci rcuit in the event that the maximum junction temperature is exceeded. when the junction temperature exceeds + 140 c , it shuts down the internal control circuit and switching power mosfet. the ap340 5 will restart automatically under the control of soft star t circuit when the junction temperature decreases to + 100 c . ordering information device package code packaging 7 tape and reel quantity part number suffix a p3405she - 7 she u - dfn2020 - 8 3 , 000/tape & reel - 7 marki ng information u - dfn 2020 - 8 (type e) part number package identification code AP3405she u - dfn2020 - 8 2v a p 3 4 0 5 s h e - 7 p a c k i n g p a c k a g e 7 : t a p e & r e e l u - d f n 2 0 2 0 - 8 ( top view ) xx y : year : 0 ~ 9 x : internal code xx : identification code w : week : a ~ z : 1 ~ 26 week ; a ~ z : 27 ~ 52 week ; z represents 52 and 53 week y w x
AP3405 document number: ds 38093 rev. 1 - 2 8 of 9 www.diodes.com january 2016 ? diodes incorporated advanced information ap34 05 package outline dimensions (all d imensions in mm . ) please see ap0200 1 at http://www.diodes.com/_ files/datasheets/ap02001.pdf for the latest version. (1) package type: u - dfn2020 - 8 (type e) suggested pad layout please see ap0200 1 at http://www.diodes.com/_ files/datasheets/ap02001.pdf for the latest version. (1) package t ype: u - dfn2020 - 8 (type e) u - dfn2020 - 8 (type e) dim min max typ a 0.50 ? 0. 60 0.56 ? a1 0 .00 0.05 0.0 2 a3 - - 0.203 b 0.2 0 0.3 0 0. 25 d 1. 950 2.075 2.00 d2 1.60 1.80 1.70 e 0. 500 bsc e 1.95 0 2.0 7 5 2.00 e2 0.80 1.00 0.90 l 0. 25 0. 35 0. 30 z - - 0.125 all dimensions in mm dimension s value (in mm) c 0.500 g 0.150 x 0.350 x1 1.800 x2 1.850 y 0.500 y1 1.000 y2 2.300 a a1 a3 seating plane d d2 e e b l e2 e2/2 pin #1 id z d2/2 r0.200 r0.120 x2 y2 x y c y1 x1 g g
AP3405 document number: ds 38093 rev. 1 - 2 9 of 9 www.diodes.com january 2016 ? diodes incorporated advanced information ap34 05 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 jurisdiction). diodes incorporated and its subsidiaries reserve the right to make modifications, e nhancements, improvements, corrections or other changes without further notice to this document and any product described herein. diodes incorporated does not assume any liability a rising out of the application or use of this document or any product descri bed herein; neither does diodes incorporated convey any license under its patent or trademark rights, nor the rights of others. any customer or user of this document or products described herein in such appli cations shall assume all risks of such use and will agree to hold diodes incorporated and all the companies whose products are represented on diodes incorporated website, harmless against all damages. diodes 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, customers shall indemnify and hold diodes incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising out 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 names and markings noted herein may also be covered by one or more united states, international or foreign 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 incorporated 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 systems are devices or systems which: 1. are intended to implant into the body, or 2. support or sustai n life and whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in significant injury to the user. b. a critical component is any component in a life supp ort device or system whose failure to perform can be reasonably expected 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 regulat ory ramifications of their life support devices 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 s afety - critical, life support devices or systems, notwithstanding any devices - or systems - related information or support that may be provided by diodes incorporated. further, customers mu st 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 6 , diodes incorporated www.diodes.com
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