AP3402 document number: ds 36623 rev. 3 - 2 1 of 10 www.diodes.com august 2015 ? diodes incorporated AP3402 new product 1.0mhz, 2a step - down dc - dc buck converter description the AP3402 is a 2a step - down dc - dc converter. a t heavy load, the constant frequency pwm control performs excellent stability and transient response. no external compensation components ar e required. the AP3402 supports a range of input voltages from 2.7 v 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 voltage . the AP3402 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 1 a. other key features inclu de over - temperature and short circuit protection, and under - voltage lockout to prevent deep battery discharge. the AP3402 delivers 2a maximum output current while consuming only 90 a of no - load quiescent current. ultra - low r ds(on) integrated mosfets and 100% duty cycle operation make the AP3402 an ideal choice for high output voltage, high current applications which require a low dropout threshold. the AP3402 is available in t sot26 package . features ? output current: up to 2 a ? output voltage: 0.6v to v in ? i nput voltage: 2.7 v to 5.5v ? peak efficiency u p to 95% ? 90 a (typ) no load quiescent curren t ? shutdown current: <1 a ? 100% duty cycle operatio n ? 1mhz switching frequenc y ? power good indicator function ? internal soft start ? no e xternal compensation required ? current limit protection ? thermal shutdown ? t sot26 p ackage ? tota lly lead - free & fully rohs compliant (note s 1 & 2) ? halogen and antimony free. pin assignments (top view) t s ot2 6 applications ? 5v or 3.3v point of load conversio n ? telecom/networking equipment ? set top boxe s ? storage eq uipmen t ? video card s ? ddr power supply 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 definiti ons 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. e n l x v i n f b g n d p g 1 2 3 4 5 p i n 1 m a r k 6
AP3402 document number: ds 36623 rev. 3 - 2 2 of 10 www.diodes.com august 2015 ? diodes incorporated AP3402 new product typical applications circu it pin description s pin number pin name function 1 en enable control input. force this pin voltage above 1.5v enables the chip, and below 0. 4 v shuts down the device 2 gnd ground pin 3 lx the drains of the internal main and synchronous power mosfet 4 vin bias supply. chip main power supply pin 5 pg power good indicator , open drain output. pg is pulled up to vin when the output voltage is within 2 0% of the regulation level, otherwise it is lo w 6 fb feedback voltage to internal error amplifier, the threshold voltage is 0.6v r 1 r 2 v i n e n l x f b l 1 2 . 2 m h c i n v i n = 2 . 7 v t o 5 . 5 v g n d c o u t 2 2 m f x 2 v o u t = 1 . 8 v o n o f f a p 3 4 0 2 c 1 2 2 p f 3 0 0 k 1 5 0 k p g 2 2 m f 1 0 0 k
AP3402 document number: ds 36623 rev. 3 - 2 3 of 10 www.diodes.com august 2015 ? diodes incorporated AP3402 new product functional block diagram absolute maximum ratings (note 4 ) symbol parameter rating unit v in input voltage - 0.3 to 6 v v en e n pi n 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 v pg pg pin voltage - 0.3 to v in +0.3 v ? ja thermal resistance (junction to ambient) t sot26 220 c /w t j operating junction temperature + 1 50 c t stg storage temperature - 6 5 to + 150 c t lead lead temperature (soldering, 5 sec) + 300 c v mm esd (machine model) 200 v 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 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 extende d periods may affect device reliability. recommended operating conditions symbol parameter min max unit v in input voltage range 2. 7 5.5 v t a operating ambient temperature - 40 + 85 c t j junction temperature range - 40 + 125 c 1 m o s c s l o p e c o m p f r e q s h i f t s r q _ q e a _ + s w i t c h i n g l o g i c a n d b l o c k i n g c i r c u i t a n t i - s h o o t t h r u p w m c o m p _ + + _ + i a m p f b e n v i n l x g n d s h u t d o w n _ _ _ _ o s c v r e f 0 . 6 c o n t r o l l o g i c + p g 4 3 2 5 1 6
AP3402 document number: ds 36623 rev. 3 - 2 4 of 10 www.diodes.com august 2015 ? diodes incorporated AP3402 new product e lectrical characteristics (@ v in = 5v, v o ut = 1. 8 v, l = 2.2 h, c o ut = 22 f 2 , t a = + 25c , unless othe rwise specified .) symbol parameters conditions min typ max unit v in input voltage range 2.7 5.5 v v o ut output voltage range 0.6 v in v v fb regula ted feedback voltage 0.588 0.6 0.612 v i fb fb leakage current v fb = 1v 0.2 a i q quiescent current v fb = 0.65v 90 a i sd shutdown current v en = 0v 1 a i lim peak inductor current 3 a f osc oscillator frequency 1 mhz r ds( on) drain to source on - s tate resistance i lx = 100ma , h igh s ide 1 10 m ? i lx = 100ma , low s ide 80 v en h en high threshold 1.5 v v e n l en low threshold 0. 4 v i en en leakage current v in = v en = 5 v - 1.0 1.0 a v uvlo input uvlo thr eshold 2.4 2.7 v v hys uvlo hysteresis 0.2 v t otp over temperature protection + 160 c t oth otp hysteresis + 30 c v fbth power good t hreshold ( r elative to v fb ) 2 0 % v iovp v in over voltage p r otection 6.25 v v ihsy iovp h ysteresis 0.25 v t ss soft - start time 1. 8 ms
AP3402 document number: ds 36623 rev. 3 - 2 5 of 10 www.diodes.com august 2015 ? diodes incorporated AP3402 new product performance characteristics (@ t a = + 25 oc , v in = 5.0v, v out = 1.8 v, unless othe rwise specified .) efficiency vs. load current feedback reference voltage vs. temperature p fe t drain - source on - state resistance vs. temperature n fe t drain - source on - state resistance vs. temperature inductor current limit vs. temperature oscillation frequency vs. temperature 1 10 100 1000 0 10 20 30 40 50 60 70 80 90 100 efficiency (%) i out (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 0.580 0.585 0.590 0.595 0.600 0.605 0.610 0.615 0.620 feedback reference voltage (v) temperature ( o c) -60 -40 -20 0 20 40 60 80 100 120 140 100 110 120 130 140 150 160 170 180 190 200 pfet r ds(on) (m ? ) temperture ( o c) -60 -40 -20 0 20 40 60 80 100 120 140 50 60 70 80 90 100 110 120 nfet r ds(on) (m ? ) temperture ( o c) -60 -40 -20 0 20 40 60 80 100 120 140 2.6 2.8 3.0 3.2 3.4 3.6 3.8 4.0 4.2 4.4 4.6 inductor current limit (a) temperature ( o c) -60 -40 -20 0 20 40 60 80 100 120 140 0.70 0.75 0.80 0.85 0.90 0.95 1.00 1.05 1.10 1.15 1.20 oscillation frequency (mhz) temperature ( o c)
AP3402 document number: ds 36623 rev. 3 - 2 6 of 10 www.diodes.com august 2015 ? diodes incorporated AP3402 new product performance characteristics (@ t a = + 25 oc , v in = 5.0v, v out = 1.8 v, unless othe r wise specified .) enable turn on characteristic (i out =2a) enable turn o ff characteristic (i out =2a) time ( 5 m s/div ) time ( 200 s/div ) short current protection (i out =2a) scp recovery (i out =2a) time ( 5 0m s/div ) time ( 5 0m s/div ) load transient (i out =0.1a to 2a) l oad tra nsient (i out =1a to 2a) time ( 100 s/div ) time ( 100 s/div ) v en ( 2 v/div ) v out ( 1 v/div ) i l ( 2a /div ) v pg ( 2 v/div ) v en ( 2 v/div ) v out ( 1 v/div ) i l ( 2a /div ) v pg ( 2 v/div ) v out ( 1 v/div ) i l ( 2a /div ) v sw ( 5 v/div ) v out ( 1 v/div ) i l ( 2a /div ) v sw ( 5 v/div ) v out_ac ( 100m v/div ) i out ( 1 a /div ) v out_ac ( 100m v/div ) i out ( 1 a /div )
AP3402 document number: ds 36623 rev. 3 - 2 7 of 10 www.diodes.com august 2015 ? diodes incorporated AP3402 new product application information typical application circuit is show n in the application circuit 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 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. s hort circuit protection and recovery when the ap34 02 output node is shorted to gnd that v fb drops under 0. 3 v, ap340 2 will enter hiccup mode to protect itself . if short circuit is removed, and v fb rises over 0. 3 v, the ap34 02 recovers to normal operation aga in. if the ap34 02 reaches ocp threshold while short circuit, the ap34 02 will enter cycle by cycle current limit mode until the current under ocp threshold. power g ood the pg pin output is an open drain mosfet. the output is pulled low when the fb voltage enters the fault condition by falling below 80% or rising above 120% of the nominal internal reference voltage. w hen the fb voltage rises to the good condition above 90% or falls below 110% of the internal voltage reference pg output moset is turned off. i t is recommended using a pull - up to vin. 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 tem perature exceeds + 1 60 o c, it shuts down the internal control circuit and switching power mosfet. the ap34 0 2 will restart automatically under the control of soft start circuit when the junction temperature decreases to + 1 30 o c. input over voltage protection when input voltage of ap340 2 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 vo ltage.
AP3402 document number: ds 36623 rev. 3 - 2 8 of 10 www.diodes.com august 2015 ? diodes incorporated AP3402 new product ordering information package temperature range part number marking id packing t sot26 - 40c to +85 c AP3402k t tr - g1 g n d 3000 / tape & reel marking information (1) tsot26 (top view) first line: logo and marking id a p 3 4 0 2 x x x x C p a c k i n g p a c k a g e p r o d u c t n a m e t r : t a p e & r e e l k t : t s o t 2 6 g 1 : g r e e n r o h s / g r e e n 1 2 3 4 5 6 g n d
AP3402 document number: ds 36623 rev. 3 - 2 9 of 10 www.diodes.com august 2015 ? diodes incorporated AP3402 new product package outline dimensions please see ap02002 at http://www.diodes.com/datasheets/ap02002.pdf for the latest version. (1) package t ype: t s ot26 suggested pad layout please see ap02001 at http://www.diodes.com/datasheets/ap02001.pdf for the latest version. (1) package t ype: t s ot26 tsot26 dim min max typ a ? ? ? a1 0.01 0.10 ? a2 0.84 0.90 ? d ? ? e ? ? e1 ? ? b 0.30 0.45 ? c 0.12 0.20 ? e ? ? e1 ? ? l 0.30 0.50 l2 ? ? 0 8 4 1 4 12 ? all dimensions in mm dimensions value (in mm) c 0.950 x 0.700 y 1.000 y1 3.199 c a1 l e1 e a2 d e1 e 6x b ? 4x 1 ?? l2 a y1 c c x (6x) y (6x)
AP3402 document number: ds 36623 rev. 3 - 2 10 of 10 www.diodes.com august 2015 ? diodes incorporated AP3402 new product important notice diodes incorporated ma kes 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). dio des incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or oth er changes without further notice to this document and any product described herein. diodes incorporated does not assume any liabil ity 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 document or produc ts 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 unauthorized sales channel. should customers purchase or use diodes incorporated products for any unintended or unauthorized application, customers shall inde mnify 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 appli cation. 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 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 sp ecifically 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 sys tems 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 significan t 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 requirem ents 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. furthe r, 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 incorporated www.d iodes.com
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