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ap 3 41 8 document number: ds 37233 rev. 2 - 2 1 of 11 www.diodes.com april 2014 ? diodes incorporated ap341 8 a product line of diodes incorporated 1.5a, 1.4mhz high efficiency synchronous dc - dc buck converter description the ap3418 is a 1.4mhz fixed frequency, current mode, pwm synchronous buck (step - down) dc - dc converter, capable of driving a 1.5a loa d with high efficiency, excellen t line and load regulation. the device integrates synchronous p - channel and n - channel power mosfet switches with low on - resistance. it is ideal for powering portable equipment that runs from a single li - ion battery. a standard series of inductors are a vailable from several different manufacturers optimized for use with the ap3418. this feature greatly simplifies the design of switch - mode power supplies. the ap3418 is available in sot 2 5 package . features ? input voltage range: 2.5v to 5.5v ? output vo ltage: 0.6v to v in ? adj output ? fixed 1.4mhz frequency ? high efficiency up to 95% ? output current: 1.5a ? current mode control ? 100% duty cycle in dropout ? built - in over current protection ? built - in short circuit protection ? built - in thermal shutdown protection ? bui lt - in uvlo function ? built - in soft - start ? totally lead - free & fully rohs compliant (notes 1 & 2) ? halogen and antimony free. green device (note 3 ) pin assignments (top view) sot 2 5 applications ? lcd tv ? set - top box ? datacom ? portable device ? smart phone 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 a ntimony - 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 a p 3 4 1 8 - a d j l c o u t c i n v i n r 2 r 1 v o u t 4 . 7 ? f 2 . 2 ? h 2 2 ? f e n v i n s w f b g n d 1 4 3 2 5 1 2 3 4 5 en gnd sw fb vin
ap 3 41 8 document number: ds 37233 rev. 2 - 2 2 of 11 www.diodes.com april 2014 ? diodes incorporated ap341 8 a product line of diodes incorporated pin description s pin number p in name function 1 en c ontrol input pin. forcing this pin above 1.5v enables the ic. forcing this pin below 0. 4 v shuts down the ic. when the ic is in shutdown mode, all functions are disabled to decrease the supply current below 1 a 2 gnd ground pin 3 sw power switch output pin. inductor connection to drain of the internal pfet and nfet switches 4 vin supply input pin. bypass to gnd with a 4.7 f or greater ceramic capacitor 5 fb this is the feedback pin of the device. connect this pin directly to the output if the fixed output voltage version is used. for the adjustable version, an external resistor divider is connected to this pin functional block diagram v o l t a g e r e f e r e n c e o s c i l l a t o r c u r r e n t s e n s e e r r o r a m p l i f i e r p w m c o m p a r a t o r m a x c u r r e n t l i m i t 0 . 6 v v o c p 0 . 4 v l o g i c c l k d r i v e r s h o r t c i r c u i t p r o t e c t i o n r e v e r s e c o m p a r a t o r e n f b g n d s w g n d v i n v i n 1 5 2 4 3 4 2
ap 3 41 8 document number: ds 37233 rev. 2 - 2 3 of 11 www.diodes.com april 2014 ? diodes incorporated ap341 8 a product line of diodes incorporated absolute maximum ratings ( note 4 ) symbol parameter rating unit v in input voltage - 0.3 to 6.0 v v fb feedback voltage - 0.3 to v in +0.3 v v en en pin voltage - 0.3 to v in +0.3 v v sw sw pin voltage - 0.3 to v in +0.3 v ja thermal resistance 265 oc/ w t j operating junction temperature + 150 oc t stg storage temperature - 65 to + 150 oc t lead lead temperature (soldering, 10sec) + 260 oc C esd(machine model) 200 v C esd(human body model) 2000 v note 4 : stresses greater than those listed under absolu te 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. exposure to absolute maximum ratings for extended periods may affect device reliability . recommended operating conditions symbol parameter min max unit v in input voltage 2.5 5.5 v t a operating ambient temperature - 40 + 85 oc
ap 3 41 8 document number: ds 37233 rev. 2 - 2 4 of 11 www.diodes.com april 2014 ? diodes incorporated ap341 8 a product line of diodes incorporated electrical c haracteristics ( v in = 5v, t a = + 25oc, unless otherwise specified. ) symbol parameter conditions min typ max unit v in input voltage C 2. 5 C 5.5 v i q quiescent current v fb = 0.65v C 62 100 a i stby shutdown supply current v en = gnd C 0.1 1 a v ref refe rence voltage for adjustable output voltage 0.588 0.6 0.612 v i fb_h feedback bias current v fb = 1v - 0.1 C 0.1 a i fb_l v fb = 0v - 0.1 C 0.1 r ds(on)_ p pmosfet r on i sw = 200ma C 0.2 C ? r ds(on) _n nmosfet r on i sw = - 200ma C 0.15 C ? i lim switch curren t limit v fb = 0.55v 1.8 2.3 C a v h en pin threshold C 1.5 C C v v l C C C 0.4 v uvlo uvlo threshold v in rising C 2.3 C v v hys uvlo hysteresis C C 0.2 C f osc oscillator frequency C 1.12 1.40 1.68 mhz d max max. duty cycle C 100 C C % d min min. du ty cycle C C C 0 i sw_h sw leakage current v sw = 0v C 0.1 C a i sw_l v sw = 5v C 0.1 C t ss soft - start time C C 1 C ms t otsd thermal shutdown C C + 160 C oc t hys thermal shutdown hysteresis C C + 20 C oc
ap 3 41 8 document number: ds 37233 rev. 2 - 2 5 of 11 www.diodes.com april 2014 ? diodes incorporated ap341 8 a product line of diodes incorporated performance characteristics ( v in = 5v, t a = + 25oc, unless otherwise specified. ) efficiency vs. output current efficiency vs. input voltage reference voltage vs. temperature switch current limit vs. temperature frequency vs. input voltage frequency vs. temperature 2.5 3.0 3.5 4.0 4.5 5.0 5.5 1.20 1.25 1.30 1.35 1.40 1.45 1.50 1.55 1.60 1.65 1.70 input voltage (v) frequency (mhz) -40 -20 0 20 40 60 80 100 120 140 1.8 2.0 2.2 2.4 2.6 2.8 temperature ( o c ) switch current limit (a) v in = 5.0v -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 temperature ( o c ) frequency (mhz) v in = v en = 5.0v -40 -20 0 20 40 60 80 100 120 140 0.56 0.57 0.58 0.59 0.60 0.61 0.62 0.63 0.64 temperature ( o c ) reference voltage (v) v in = 5.0v 2.5 3.0 3.5 4.0 4.5 5.0 5.5 40 45 50 55 60 65 70 75 80 85 90 95 100 input voltage (v) efficiency (%) v out = 1.8v i out = 1.5a 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 60 65 70 75 80 85 90 95 100 output current (a) efficiency (%) v in = 5.0v v out =1.8v
ap 3 41 8 document number: ds 37233 rev. 2 - 2 6 of 11 www.diodes.com april 2014 ? diodes incorporated ap341 8 a product line of diodes incorporated performance characteristics (cont. v in = 5v, t a = + 25oc, unless otherwis e specified. ) r ds (on)_up vs. temperature r ds (on)_ down vs. temperature output ripple (i out = 0a) output ripple (i out = 1.5a) enable turn on (i out = 1.5a) enable turn off (i out = 1.5a) time 1 s/div v sw 2v/div i l 1a/div v out_ac 10mv/div v sw 2v/div i l 200ma/div time 10m s/div v out_ac 10mv/div time 200 s/div v out 1v/div i l 1a/div v en 5v/div v sw 2v/div time 200 s/div v out 1v/div i l 1a/div v en 5v/div v sw 2v/div -40 -20 0 20 40 60 80 100 120 140 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 temperature ( o c ) nmos r ds(on)_down ( ? ) v in = 5.0v i sw = 200ma -40 -20 0 20 40 60 80 100 120 140 0.0 0.1 0.2 0.3 0.4 0.5 temperature ( o c ) pmos r ds(on)_up ( ? ? v in = 5.0v i sw = 200ma
ap 3 41 8 document number: ds 37233 rev. 2 - 2 7 of 11 www.diodes.com april 2014 ? diodes incorporated ap341 8 a product line of diodes incorporated performance characteristics (cont. v in = 5v, t a = + 25oc, unless otherwise specified. ) short circuit protection short circuit protection recovery (i out = 1.5a) (i out = 1.5a) i l 1a/div v out 2v/div v sw 5v/div i l 1a/div v out 2v/div v sw 5v/div time 10m s/div time 10m s/div
ap 3 41 8 document number: ds 37233 rev. 2 - 2 8 of 11 www.diodes.com april 2014 ? diodes incorporated ap341 8 a product line of diodes incorporated ordering information diodes ics pb - free products with "g1" suffix in the part number, are rohs compliant and green . package temperature range part number marking id packing sot 2 5 - 40 to +85 oc ap3418ktr - g1 g5e 3000 / tape & reel mark ing information (top view) : logo g 5e : marking id a p 3 4 1 8 x x x - x x 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 : s o t 2 5 g 1 : g r e e n r o h s / g r e e n
ap 3 41 8 document number: ds 37233 rev. 2 - 2 9 of 11 www.diodes.com april 2014 ? diodes incorporated ap341 8 a product line of diodes incorporated package outline dimensions (all d imensions in mm ( inch ) . ) (1) package type: sot 2 5 2 . 8 2 0 ( 0 . 1 1 1 ) 2 . 6 5 0 ( 0 . 1 0 4 ) 1 . 5 0 0 ( 0 . 0 5 9 ) 0 . 0 0 0 ( 0 . 0 0 0 ) 0 . 3 0 0 ( 0 . 0 1 2 ) 0 . 9 5 0 ( 0 . 0 3 7 ) 0 . 9 0 0 ( 0 . 0 3 5 ) 0 . 1 0 0 ( 0 . 0 0 4 ) 0 . 2 0 0 ( 0 . 0 0 8 ) 0 . 3 0 0 ( 0 . 0 1 2 ) 8 0 3 . 1 0 0 ( 0 . 1 2 2 ) 1 . 7 0 0 ( 0 . 0 6 7 ) 3 . 0 0 0 ( 0 . 1 1 8 ) 0 . 5 0 0 ( 0 . 0 2 0 ) 0 . 1 5 0 ( 0 . 0 0 6 ) 1 . 3 0 0 ( 0 . 0 5 1 ) 0 . 2 0 0 ( 0 . 0 0 8 ) 0 . 6 0 0 ( 0 . 0 2 4 ) 1 . 8 0 0 ( 0 . 0 7 1 ) 2 . 0 0 0 ( 0 . 0 7 9 ) 0 . 7 0 0 ( 0 . 0 2 8 ) r e f t y p 1 . 4 5 0 ( 0 . 0 5 7 ) m a x
ap 3 41 8 document number: ds 37233 rev. 2 - 2 10 of 11 www.diodes.com april 2014 ? diodes incorporated ap341 8 a product line of diodes incorporated suggested pad layout (1) package t ype: sot 2 5 dimensions z (mm)/(inch) g (mm)/(inch) x (mm)/(inch) y (mm)/(inch) e1 (mm)/(inch) e2 (mm)/(inch) value 3.600/0.142 1.600/0.063 0.700/0.028 1.000/0.039 0.950/0.0 37 1.900/0.075 e 2 e 1 y x g z
ap 3 41 8 document number: ds 37233 rev. 2 - 2 11 of 11 www.diodes.com april 2014 ? diodes incorporated ap341 8 a product line of diodes incorporated 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, enhancements, improvements, corrections or other changes without further notice to this document and an y 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 this document or products described herein in such applications shall assu me 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 pro ducts 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 pers onal 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 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 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 provide d 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 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 so lely 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 infor mation or support that may be provided by diodes incorporated. further, customers must fully indemnify diodes incorporated a nd its representatives against any damages arising out of the use of diodes incorporated products in such safety - critical, life sup port devices or systems. copyright ? 201 4 , diodes incorporated www.diodes.com

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