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ap3428/a document number: ds 37417 rev. 2 - 2 1 of 13 www.diodes.com june 2016 ? diodes incorporated new product ap34 28/a 1.5mhz, 1a step - down dc - dc buck converter description the ap3428/a is a 1a step - down dc - dc converter. at heavy load, the constant - frequency pwm control performs excellent stability and transient response. no external compensation components are required. the ap3428/a supports a range of input voltages from 2.5v to 5.5v, allowing the use of a single li+/li - polymer cell, multiple alkaline/nimh cell, and other standard power sources. the output voltage is adjustable from 0.6v to the input volt age. the ap3428/a employs internal power switch and synchronous rectifier to minimize external part count and realize high efficiency. during shutdown, the input is disconnected from the output and the shutdown current is less than 1a. other key features include over - temperature and short circuit protection, and under - voltage lockout to prevent deep battery discharge. the ap3428/a delivers 1a maximum output current while consuming only 40a of no - load quiescent current. ultra - low r ds(on) integrated mosfet s and 100% duty cycle operation make the ap3428 /a an ideal choice for high output voltage, high current applications which require a low dropout threshold. pulse skip mode allows to maintain high efficiency at light - load conditions. the ap3428/a is availa ble in t sot25 , u - dfn2020 - 6 (t ype j) packages . features ? output current: up to 1a ? output voltage: 0.6v to v in ? input voltage: 2.5v to 5.5v ? 0.6v reference voltage with 2% precision ? 40 a (typ) no load quiescent current ? shutdown current: <1 a ? 100% duty cycle operation ? 1.5mhz switching frequency ? internal soft start ? no e xternal compensation required ? current limit protection ? thermal shutdown ? t sot2 5 , u - dfn2020 - 6 ( t ype j) packages ? totally lead - free & fully rohs compliant (notes 1 & 2) ? halogen and antimony free. green device (note 3 ) pin assignments (top view) t sot2 5 for ap3428 (top view) t sot2 5 for ap3428a (top view) u - dfn2020 - 6 ( t ype j) applic ations ? p ost dc - dc v oltage r egulation ? set top boxes ? notebook c omputer ? pad 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 ab out 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 <100 0ppm antimony compounds. n c e n v i n f b g n d l x p in 1 mark 1 2 3 4 5 6 1 2 3 4 5 en gnd lx fb vin 1 2 3 4 5 en gnd lx fb vin
ap3428/a document number: ds 37417 rev. 2 - 2 2 of 13 www.diodes.com june 2016 ? diodes incorporated new product ap34 28/a typical applications circuit pin description s pin number p in name function t sot2 5 for ap3428 t sot2 5 for ap3428a u - dfn2020 - 6 ( t ype j) 1 3 2 en enable control input. force this pin voltage above 1.5v enables the chip, and below 0. 4 v shuts down the device. 2 2 5 gnd ground pin 3 5 4 lx the drains of the internal main and synchronous power mosfet. 4 1 3 vin bias supply. chip main power supply pin 5 4 6 fb feedback voltage to intern al error amplifier, the threshold voltage is 0.6v. C C 1 nc nc r 1 r 2 v i n e n l x f b l 1 2 . 2 m h c i n 1 0 m f v i n = 2 . 5 v t o 5 . 5 v g n d c o u t 1 0 m f v o u t = 1 . 8 v o n o f f a p 3 4 2 8 / a c 1 2 2 p f 3 0 0 k 1 5 0 k
ap3428/a document number: ds 37417 rev. 2 - 2 3 of 13 www.diodes.com june 2016 ? diodes incorporated new product ap34 28/a functional block diagram l x 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 v i n 1 ( 3 ) { 2 } 5 ( 4 ) { 6 } 2 ( 2 ) { 5 } 3 ( 5 ) { 4 } 4 ( 1 ) { 3 } a : t s o t 2 5 f o r a p 3 4 2 8 ( b ) : t s o t 2 5 f o r a p 3 4 2 8 a { c } : u - d f n 2 0 2 0 - 6
ap3428/a document number: ds 37417 rev. 2 - 2 4 of 13 www.diodes.com june 2016 ? diodes incorporated new product ap34 28/a absolute maximum ratings (note 4 ) symbol parameter rating unit v in input voltage - 0.3 to 6 v v en e n pin voltage - 0.3 to v in +0. 3 v v lx lx pin voltage - 0.3 to v in +0. 3 v v fb feedback pin voltage - 0.3 to v in +0. 3 v p d power dissipation (o n pcb, t a = + 25c) tsot25 0.4 w u - dfn2020 - 6 ( t ype j) 1. 89 ja thermal resistance (junction to ambient) tsot25 220 c/w u - dfn2020 - 6 ( t ype j) 53 jc ? thermal resistance (junction to case , simulation) tsot25 130 oc/w u - dfn2020 - 6 ( t ype j) 25 t j operating junction temperature +1 5 5 c t stg storage temperature - 5 5 to +150 c v mm esd (machine model) 200 v v hbm esd (human body model) 2000 v v cd m esd ( c harge d evice m ode) 1000 v note 4 : stresses greater than those listed under absolute maximum ratings may cause permanent dama ge 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 condi tions is not implied. exposure to absolute maximum ratings for extended per iods may affect device reliability. recommended operating conditions symbol parameter min max unit v in supply voltage 2.5 5.5 v t j junction temperature range - 40 + 125 c t a operating ambient temperature - 40 + 85 c
ap3428/a document number: ds 37417 rev. 2 - 2 5 of 13 www.diodes.com june 2016 ? diodes incorporated new product ap34 28/a electrical characteristics (@ t a = + 25 oc , v in = 5.0v, v out = 2.5v, c out = 10 f, l = 2.2 h , unless othe rwise specified .) symbol parameter condition min typ max unit v in input voltage range C 2.5 C 5.5 v v o ut output voltage range C 0.6 C v in v i q quiescent current v fb = 0.65v C 40 C a i sd shutdown current v en = 0v C 0.1 1 a v fb regulated feedback voltage C 0.588 0.6 0.612 v i fb fb leakage current v fb = 1v C C 0.2 a i lim peak inductor current C 1.3 C C a f osc oscillator frequency C C 1.5 C mhz r ds(on) drain - source on - state resistance i sw = 100ma high side C 250 C m? i sw = 100ma low side C 170 C m? r disch output discharge switch on resister C C 2.1 C k ? v en h en threshold high C 1.5 C C v v e nl en threshold low C C C 0.4 v i en en leakage current v in = v en =5v - 1.0 C 1.0 a v uvlo input uvlo threshold C C 2.4 2.7 v v hys uvlo hysteresis C C 0.1 C v t otp over temperature protection C C + 160 C c t oth otp hysteresis C C + 15 C c t ss soft - start time C C 2 C ms
ap3428/a document number: ds 37417 rev. 2 - 2 6 of 13 www.diodes.com june 2016 ? diodes incorporated new product ap34 28/a performance characteristics ( @ t a = +25c, v in = 5 v, v out = 1. 8 v, unless otherwise specified.) efficiency vs. load current feedback reference voltage vs. temperature p fe t drain - source on - state resistance vs. temperatu re n fe t drain - source on - state resistance vs. temperature quiescent current vs. temperature oscillation frequency vs. temperature 10 100 1000 0 10 20 30 40 50 60 70 80 90 100 efficiency(%) output current(ma) v in =5v, v out =1.0v v in =5v, v out =1.8v v in =5v, v out =3.3v -60 -40 -20 0 20 40 60 80 100 120 140 0.570 0.575 0.580 0.585 0.590 0.595 0.600 0.605 0.610 0.615 0.620 0.625 0.630 feedback reference voltage v temperature oc -60 -40 -20 0 20 40 60 80 100 120 140 100 120 140 160 180 200 220 240 260 pfet rdson mohm temperature oc -60 -40 -20 0 20 40 60 80 100 120 140 80 100 120 140 160 180 200 220 240 nfetrdson mohm temperatrue oc -60 -40 -20 0 20 40 60 80 100 120 140 0 10 20 30 40 50 60 70 80 90 100 quiescent current ua temperatrue oc -60 -40 -20 0 20 40 60 80 100 120 140 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 oscillation frequency mhz temperature oc
ap3428/a document number: ds 37417 rev. 2 - 2 7 of 13 www.diodes.com june 2016 ? diodes incorporated new product ap34 28/a performance characteristics ( @ t a = +25c, v in = 5 v, v out = 1. 8 v, unless ot herwise specified.) enable turn on characteristic (i out = 1 a) enable turn off characteristic (i out = 1 a) short current protection (i out =1 a) scp recovery (i out =1 a) load transient (i out =0.1a to 1 a) load transient (i out =0.5 a to 1 a) en (5v/div) vout (1v/div) il (1a/div) sw (5v/div) en (5v/div ) vout (1v/div) il (1a/div) sw (5v/div) vout (1v/div) il (1a/div) sw (5v/div) vout ( 1v/div) il (1a/div) sw (5v/div) vout_ac (100mv/div ) io (1a/div) vout_ac (100mv/div) io (1a/div) time ( 2m s/div) time ( 2m s /div) time ( 2m s/div) time ( 2m s /div) time ( 2m s/div) time ( 2m s /div)
ap3428/a document number: ds 37417 rev. 2 - 2 8 of 13 www.diodes.com june 2016 ? diodes incorporated new product ap34 28/a application information typical application circuit is shown in the typical a pplication s c ircuit and for the circuit parameters setting please refers 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 ou t 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 ap3428/a output node is shorted to gnd that v fb drops under 0. 42 v, ap3428/a will enter hiccup mode to protect itself . if short circuit is removed, and v fb rises over 0. 4 2 v, the ap3428/a recovers to normal operation again. if the ap3428/a reaches ocp threshold while short circuit, the ap3428/a will enter cyc le by cycle current limit mode until the current under ocp threshold. 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 exc eeded. when the junction temperature exceeds + 1 60 c , it shuts down the internal control circuit and switching power mosfet. the ap3428/a will restart automatically under the control of soft start circuit when the junction temperature decreases to + 1 45 c . setting the output voltage the output voltage can be adjusted from 1 to 5v using an external resistor divider. table 1 shows a list of resistor selectio ns for common output voltages. resistor r1 is selected based on a design tradeoff between efficiency an d output voltage accuracy. for high values of r1 there is less current consumption in the feedback network. however the tradeoff is output voltage accuracy due to the bias current in the e rror amplifier. r1 can be deter mined by the following equation . mean while, the input capacitor should close to ic for preventing unexpected influences. figure 1. feedback divider network table 1. resistor selection for common ou tput out voltage r1 r2 c 1 1.0v 91k 120k 22pf 1.2v 100k 100k 22pf 1.5v 150k 100k 22pf 1.8v 300k 150k 22pf 2.5v 380k 120k 22pf 2.8v 440k 120k 22pf 3.3v 430k 100k 22pf l x f b r 1 r 2 c 1
ap3428/a document number: ds 37417 rev. 2 - 2 9 of 13 www.diodes.com june 2016 ? diodes incorporated new product ap34 28/a ordering information package temperature range part number marking id packing t sot2 5 - 40 to + 85 c a p 342 8 ak t tr - g1 l2j 3000/ tape & reel ap342 8 k t tr - g1 l2h 3000/ tape & reel u - dfn2020 - 6 ( t ype j) ap3428dntr - g1 cq 3000/ tape & reel k t : t s o t 2 5 a p 3 4 2 8 x x x C p a c k i n g p a c k a g e t r : t a p e & r e e l p r o d u c t n a m e g 1 : g r e e n r o h s / g r e e n d n : u - d f n 2 0 2 0 - 6 p r o d u c t v e r s i o n a : a p 3 4 2 8 a b l a n k : a p 3 4 2 8
ap3428/a document number: ds 37417 rev. 2 - 2 10 of 13 www.diodes.com june 2016 ? diodes incorporated new product ap34 28/a mark ing information (1) tsot2 5 for ap3428 (top view) (2) tsot2 5 for ap3428a (top view) (3) u - dfn2020 - 6 ( t ype j) (top view) first l ine : logo and marking i d first l ine : logo and marking id first l ine : logo and marking id
ap3428/a document number: ds 37417 rev. 2 - 2 11 of 13 www.diodes.com june 2016 ? diodes incorporated new product ap34 28/a package outline dimensions (1) package type: t sot2 5 (2) package type: u - dfn2020 - 6 ( t ype j) tsot25 dim min max typ a - 1.00 - a1 0.01 0.10 - a2 0.84 0.90 - b 0.30 0.45 - c 0.12 0.20 - d - - 2.90 e - - 2.80 e1 - - 1.60 e 0.95 bsc e1 1.90 bsc l 0.30 0.50 l2 0.25 bsc 0 8 4 1 4 12 - all dimensions in mm u - dfn2020 - 6 (type j) dim min max typ a 0.50 0.60 -- a1 0.0 0 0.05 0.03 a3 -- -- 0.203 b 0.20 0.30 0.25 d 1.95 2.075 2.00 d2 1.45 1.65 1.55 e 1.95 2.075 2.00 e2 0.76 0.96 0.86 e 0.65 bsc l 0.30 0.40 0.35 all dimensions in mm d e1 e1/2 e1 e e/2 e a a2 a1 seating plane 0 l2 l gauge plane 01(4x) 01(4x) c b seating plane d d2 e e b l e2 a a1 a3 d2/2 e2/2 r0.100 seating plane
ap3428/a document number: ds 37417 rev. 2 - 2 12 of 13 www.diodes.com june 2016 ? diodes incorporated new product ap34 28/a suggested pad layout (1) package type: t sot2 5 (2) package type: u - dfn2020 - 6 (t ype j) dimensions value (i n mm) c 0.650 g 0.120 x 0.350 x1 1.650 y 0.550 y1 0.960 y2 2.300 dimensions value (in mm) c 0.950 x 0.700 y 1.000 y1 3.199 y1 c x y x1 y2 y1 c x y g
ap3428/a document number: ds 37417 rev. 2 - 2 13 of 13 www.diodes.com june 2016 ? diodes incorporated new product ap34 28/a important notice diodes incorporated makes no warranty of any kind, express or implied, with regards to this document, including, but not limit ed 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, improvement s, 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 described 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 diode s 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 unauth orized 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, expense s, 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 en glish 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 system s 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 sustain 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 support device or system who se 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 regulatory ramifications of the ir 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 safety - critical, life sup port 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 incorpora ted and its representatives against any damages arising ou t 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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