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c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 3 - s e p . , 2 0 0 8 a p w 7 1 4 5 w w w . a n p e c . c o m . t w 1 a n p e c r e s e r v e s t h e r i g h t t o m a k e c h a n g e s t o i m p r o v e r e l i a b i l i t y o r m a n u f a c t u r a b i l i t y w i t h o u t n o t i c e , a n d a d v i s e c u s t o m e r s t o o b t a i n t h e l a t e s t v e r s i o n o f r e l e v a n t i n f o r m a t i o n t o v e r i f y b e f o r e p l a c i n g o r d e r s . 3 a , 1 2 v , s y n c h r o n o u s - r e c t i f i e d b u c k c o n v e r t e r the APW7145 is a 3a synchronous-rectified buck con- verter with integrated 55m w power mosfets. the APW7145, designed with a current-mode control scheme, can convert wide input voltage of 4.3v to 14v to the out- put voltage adjustable from 0.8v to vin to provide excel- lent output voltage regulation. for high efficiency over all load current range, the APW7145 is equipped with an automatic skip/pwm mode operation. at light load, the ic operates in the skip mode, which keeps a constant minimum inductor peak current, to reduce switching losses. at heavy load, the ic works in pwm mode, which inductor peak current is programmed by the comp voltage, to provide high efficiency and ex- cellent output voltage regulation. the ap w7 145 is also equipped with power-on-rese t, soft- start, soft-stop, and whole protections (under-voltage, over-voltage, over-temperature, and current-limit) into a single package. in shutdown mode, the supply current drops below 3 m a. this device, available sop-8p and dfn4x4-8 packages, provides a very compact system solution with minimal external components and pcb area. f e a t u r e s g e n e r a l d e s c r i p t i o n w i d e i n p u t v o l t a g e f r o m 4 . 3 v t o 1 4 v output current up to 3a adjustable output voltage from 0.8v to v in - 2% system accuracy 5 5 m w i n t e g r a t e d p o w e r m o s f e t s h i g h e f f i c i e n c y u p t o 9 5 % - automatic skip/pwm mode operation c u r r e n t - m o d e o p e r a t i o n - e a s y f e e d b a c k c o m p e n s a t i o n - s t a b l e w i t h l o w e s r o u t p u t c a p a c i t o r s - f a s t l o a d / l i n e t r a n s i e n t r e s p o n s e p o w e r - o n - r e s e t m o n i t o r i n g f i x e d 5 0 0 k h z s w i t c h i n g f r e q u e n c y i n p w m m o d e b u i l t - i n d i g i t a l s o f t - s t a r t a n d s o f t - s t o p c u r r e n t - l i m i t p r o t e c t i o n w i t h f r e q u e n c y f o l d b a c k 1 1 8 % o v e r - v o l t a g e p r o t e c t i o n h i c c u p - m o d e 5 0 % u n d e r - v o l t a g e p r o t e c t i o n o v e r - t e m p e r a t u r e p r o t e c t i o n < 3 m a q u i e s c e n t c u r r e n t i n s h u t d o w n m o d e s o p - 8 p a n d c o m p a c t 4 m m x 4 m m d f n - 8 ( d f n 4 x 4 - 8 ) p a c k a g e s lead free and green devices available (rohs compliant) a p p l i c a t i o n s olpc, umpc notebook computer handheld portable device step-down converters requiring high efficiency a n d 3 a o u t p u t c u r r e n t 0 10 20 30 40 50 60 70 80 90 100 0.001 0.01 0.1 1 10 v in =5v, v out =3.3v, l1=2.2 f v in =12v, v out =5v, l1=6.8 f v in =12v, v out =3.3v, l1=4.7 f v in =12v, v out =2v, l1=3.3 f v in =5v, v out =1.2v, l1=2.2 f
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 3 - s e p . , 2 0 0 8 a p w 7 1 4 5 w w w . a n p e c . c o m . t w 2 o r d e r i n g a n d m a r k i n g i n f o r m a t i o n a b s o l u t e m a x i m u m r a t i n g s ( n o t e 1 ) symbol parameter rating unit v in vin supply voltage (vin to agnd) - 0.3 ~ 1 5 v > 100ns - 1 ~ v in +1 v lx lx to gnd voltage < 100ns - 5 ~ v in +5 v pgnd to agnd voltage - 0.3 ~ +0.3 v en to agnd voltage - 0.3 ~ v in +0.3 v fb, comp to agnd voltage - 0.3 ~ 6 v p d power dissipation internally limited w maximum junction temperature 150 o c t stg storage temperature - 65 ~ 150 o c t sdr maximum lead soldering temperature, 10 seconds 260 o c note 1 : stresses above those listed in bsolute maximum rati ngs may cause permanent damage to the device. n o t e : a n p e c l e a d - f r e e p r o d u c t s c o n t a i n m o l d i n g c o m p o u n d s / d i e a t t a c h m a t e r i a l s a n d 1 0 0 % m a t t e t i n p l a t e t e r m i n a t i o n f i n i s h ; w h i c h a r e f u l l y c o m p l i a n t w i t h r o h s . a n p e c l e a d - f r e e p r o d u c t s m e e t o r e x c e e d t h e l e a d - f r e e r e q u i r e m e n t s o f i p c / j e d e c j - s t d - 0 2 0 c f o r m s l c l a s s i f i c a t i o n a t l e a d - f r e e p e a k r e f l o w t e m p e r a t u r e . a n p e c d e f i n e s ? g r e e n ? t o m e a n l e a d - f r e e ( r o h s c o m p l i a n t ) a n d h a l o g e n f r e e ( b r o r c l d o e s n o t e x c e e d 9 0 0 p p m b y w e i g h t i n h o m o g e n e o u s m a t e r i a l a n d t o t a l o f b r a n d c l d o e s n o t e x c e e d 1 5 0 0 p p m b y w e i g h t ) . p i n c o n f i g u r a t i o n nc vin agnd fb 1 2 3 4 pgnd lx en comp 8 7 6 5 9 lx APW7145 sop-8p top view the pin 7 must be connected to the exposed pad dfn 4x4-8 top view 1 6 5 4 3 2 8 7 pgnd en lx comp vin fb nc agnd APW7145 APW7145 package code ka : sop-8p qa: dfn4x4-8 operating ambient temperature range i : -40 to 85 o c handling code tr : tape & reel assembly material l : lead free device g : halogen and lead free device handling code temperature range package code assembly material APW7145 ka : xxxxx - date code APW7145 xxxxx APW7145 qa : APW7145 xxxxx xxxxx - date code
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 3 - s e p . , 2 0 0 8 a p w 7 1 4 5 w w w . a n p e c . c o m . t w 3 symbol parameter range unit v in vin supply voltage 4. 3 ~ 1 4 v v out converter output voltage 0.8 ~ v in v i out converter output current 0 ~ 3 a c in converter input capacitor (mlcc) 8 ~ 50 m f converter output capacitor 20 ~ 100 0 m f c out effective series resistance 0 ~ 60 m w l out converter output inductor 1 ~ 22 m h resistance of the feedback resistor connected from fb to gnd 1 ~ 20 k w t a ambient temperature - 40 ~ 85 o c t j junction temperature - 40 ~ 125 o c note 4: refer to the typical ap plication circuits r e c o m m e n d e d o p e r a t i n g c o n d i t i o n s (note 4) e l e c t r i c a l c h a r a c t e r i s t i c s refer to the ? t ypical a pplication c ircuits?. these specifications apply over v in = 12 v, v out =3.3 v and t a = - 4 0 ~ 85 c, unless otherwise specified. typical values are at t a =25c. apw714 5 symbol parameter test conditions min . typ . max . unit supply current i vin vin supply current v fb = v ref +50mv , v en =3v, lx=nc - 0.5 1.5 ma i vin_sd vin shutdown supply current v en = 0v - - 3 m a power - on - reset (por) voltage threshold vin por voltage threshold v in rising 3. 9 4.1 4. 3 v vin por hysteresis - 0.5 - v reference voltage v ref reference voltage regulated on fb pin - 0.8 - v t j = 25 o c, i out = 1 0 m a, v in =12v - 1.0 - +1.0 output voltage accuracy i out = 1 0 m a ~3a , v in = 4.75~14 v - 2.0 - +2.0 % line regulation v in = 4. 7 5v to 1 4 v - +0.02 - % /v load regulation i out = 0.5a ~ 3a - - 0.04 - % /a symbol parameter typical value unit q ja junction - to - ambient thermal resistance in free air (note 2 ) sop - 8p dfn4x4 - 8 50 65 o c/w q jc junction - to - case resistance in free air (note 3 ) sop - 8p dfn4x4 - 8 20 30 o c /w note 2 : q ja is measured with the component mounted on a high effective thermal conductivity test board in free air. note 3 : the case temperature is measured at the center of the exposed pad on the underside of the sop - 8p and dfn4x4 - 8 packages. t h e r m a l c h a r a c t e r i s t i c s
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 3 - s e p . , 2 0 0 8 a p w 7 1 4 5 w w w . a n p e c . c o m . t w 4 e l e c t r i c a l c h a r a c t e r i s t i c s ( c o n t . ) refer to the ? t ypical a pplication c ircuits?. these specifications apply over v in = 12 v, v out = 3.3 v and t a = - 4 0 ~ 85 c, unless otherwise specified. typical values are at t a =25c. apw714 5 symbol parameter test conditions min . typ . max . unit oscillator and duty cycle f osc oscillator frequency t j = - 40 ~ 125 o c, v in = 4. 7 5 ~ 1 4 v 450 500 550 k hz foldback frequency v out = 0v - 80 - k hz maximum converter?s duty - 99 - % t on_min minimum pulse width of lx - 1 5 0 - ns current - mode pwm converter gm error amplifier transconductance v fb =v ref 50mv - 200 - m a/v error amplifier dc gain comp = nc - 80 - db current - sense to comp voltage transresistance - 0.1 - v/a between vin and exposed pad, v in = 5v , t j =25c - 70 100 high - side switch resistance between vin and exposed pad, v in = 12v , t j =25c - 55 80 m w between gnd and exposed pad, v in = 5v , t j =25c - 55 80 low - side switch resistance between gnd and exposed pad, v in = 12v , t j =25c - 45 60 m w protections i lim high - side switch c urrent - limit peak current 5 6 .5 8 a v th_uv fb under - voltage threshold v fb falling 45 50 55 % v th_ov fb over - voltage threshold v fb rising 114 118 122 % fb under - voltage debounce - 1 - m s t otp over - t emperature trip point - 150 - o c over - te mperature hysteresis - 40 - o c t d dead - time v lx = - 0.7v - 20 - ns soft - start, soft - stop, enable , and input currents t ss soft - start / soft - stop interval 1.5 2 2. 5 ms en shutdown voltage threshold v en falling 0.5 - - v en enable voltage thresh old - - 2.1 v high - side switch leakage current v en = 0v, v lx = 0v - - 2 m a i fb fb pin input current - 100 - +100 na i en en pin input current v en = 0v ~ v in - 100 - +100 na
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 3 - s e p . , 2 0 0 8 a p w 7 1 4 5 w w w . a n p e c . c o m . t w 5 t y p i c a l o p e r a t i n g c h a r a c t e r i s t i c s v i n i n p u t c u r r e n t v s . s u p p l y v o l t a g e s u p p l y v o l t a g e , v i n ( v ) vin input current, i vin (ma) current limit level (peak current) vs. junction temperature j u n c t i o n t e m p e r a t u r e , t j ( o c ) o u t p u t v o l t a g e v s . s u p p l y v o l t a g e s u p p l y v o l t a g e , v i n ( v ) o u t p u t c u r r e n t v s . e f f i c i e n c y o u t p u t c u r r e n t v s . o u t p u t v o l t a g e o u t p u t c u r r e n t , i o u t ( a ) o u t p u t c u r r e n t , i o u t ( a ) output voltage, v out (v) efficiency (%) output voltage, v out (v) current limit level, ilim(a) reference voltage, v ref (v) j u n c t i o n t e m p e r a t u r e , t j ( o c ) r e f e r e n c e v o l t a g e v s . j u n c t i o n t e m p e r a t u r e 0.784 0.788 0.792 0.796 0.800 0.804 0.808 0.812 0.816 -50 -25 0 25 50 75 100 125 150 3.2 3.22 3.24 3.26 3.28 3.3 3.32 3.34 3.36 3.38 3.4 4 6 8 10 12 14 i out =500ma (refer to the application circuit 1 in the section ?typical application circuits?, v in =12v, v out =3.3v, l1=4.7 m h) 0.0 0.5 1.0 1.5 2.0 0 2 4 6 8 10 12 14 v fb =0.85v 5.5 6 6.5 7 7.5 7 -40 -20 0 20 40 60 80 100 120 140 3.2 3.22 3.24 3.26 3.28 3.3 3.32 3.34 3.36 3.38 3.4 0 1 2 3 0 10 20 30 40 50 60 70 80 90 100 0.001 0.01 0.1 1 10 v in =5v, v out =3.3v, l1=2.2 f v in =12v, v out =5v, l1=6.8 f v in =12v, v out =3.3v, l1=4.7 f v in =12v, v out =2v, l1=3.3 f v in =5v, v out =1.2v, l1=2.2 f
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 3 - s e p . , 2 0 0 8 a p w 7 1 4 5 w w w . a n p e c . c o m . t w 6 t y p i c a l o p e r a t i n g c h a r a c t e r i s t i c s ( c o n t . ) o s c i l l a t o r f r e q u e n c y v s . j u n c t i o n t e m p e r a t u r e oscillator frequency, f osc (khz) j u n c t i o n t e m p e r a t u r e , t j ( o c ) (refer to the application circuit 1 in the section ?typical application circuits?, v in =12v, v out =3.3v, l1=4.7 m h) 450 460 470 480 490 500 510 520 530 540 550 -50 -25 0 25 50 75 100 125 150
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 3 - s e p . , 2 0 0 8 a p w 7 1 4 5 w w w . a n p e c . c o m . t w 7 e n a b l e s h u t d o w n v en v out i l1 ch1 : v en , 5v/div ch3 : i l1 , 2a/div time : 100 m s/div ch2 : v out , 2v/div 1 2 3 i out =3a ch1 : v en , 5v/div ch3 : i l1 , 2a/div time : 1 ms/div ch2 : v out , 2v/div 1 2 3 v en v out i l1 i out =3a p o w e r o n p o w e r o f f ch1 : v in , 5v/div ch2 : v out , 2v/div time : 1ms/div 1 2 3 ch3 : i l1 , 2a/div v in v out i l1 i out =3a ch1 : v in , 5v/div ch2 : v out , 2v/div time : 10ms/div ch3 : i l1 , 2a/div 1 2 3 v in v out i l1 i out =3a o p e r a t i n g w a v e f o r m s (refer to the application circuit 1 in the section ?typical application circuits?, v in =12v, v out =3.3v, l1=4.7 m h)
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 3 - s e p . , 2 0 0 8 a p w 7 1 4 5 w w w . a n p e c . c o m . t w 8 o p e r a t i n g w a v e f o r m s ( c o n t . ) l o a d t r a n s i e n t r e s p o n s e l o a d t r a n s i e n t r e s p o n s e (refer to the application circuit 1 in the section ?typical application circuits?, v in =12v, v out =3.3v, l1=4.7 m h) ch1 : v out , 100mv/div ch2 : i l1 , 2a/div time : 100 m s/div i l1 v out 1 2 i out = 0.5a-> 3a ->0.5a i out rising/falling time=10 m s v out i l1 ch1 : v out , 200mv/div ch2 : i l1 , 2a/div time : 100 m s/div 1 2 i out = 50ma-> 3a ->50ma i out rising/falling time=10 m s s h o r t c u r r e n t s h o r t c i r c u i t ch1 : v lx , 10v/div ch2 : v out , 2v/div ch3 : i l1 , 5a/div time : 20 m s/div i out =3~7a v lx v out i l1 1 2 3 1 2 3 v lx v out i l1 ch1 : v lx , 5v/div ch2 : v out , 200mv/div ch3 : i l1 , 5a/div time : 5 m s/div v out is shorted to gnd by a short wire
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 3 - s e p . , 2 0 0 8 a p w 7 1 4 5 w w w . a n p e c . c o m . t w 9 o p e r a t i n g w a v e f o r m s ( c o n t . ) l i n e t r a n s i e n t (refer to the application circuit 1 in the section ?typical application circuits?, v in =12v, v out =3.3v, l1=4.7 m h) over voltage protection v in v out i l1 1 2 4 3 v lx i out =-1a ch1 : v in , 5v/div ch2 : v out , 2v/div ch4 : i l1 , 5a/div time : 20 m s/div ch3 : v lx , 5v/div v in v out i l1 ch1 : v in , 5v/div ch2 : v out , 50mv/div (voffset=3.3v) time : 100 m s/div 1 2 3 ch3 : i l1 , 2a/div v in = 5~12v v in rising/falling time=20 m s s w i t c h i n g w a v e f o r m s w i t c h i n g w a v e f o r m ch1 : v lx , 5v/div ch2 : i l1 , 2a/div time : 1 m s/div i l1 v lx i out = 0.2a 1 2 ch1 : v lx , 5v/div ch2 : i l1 , 2a/div time : 1 m s/div v lx i l1 i out = 3a 1 2
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 3 - s e p . , 2 0 0 8 a p w 7 1 4 5 w w w . a n p e c . c o m . t w 1 0 p i n d e s c r i p t i o n pin no. name function 1 nc no connection. 2 vin power input. vin supplies the power (4. 3 v to 1 4 v) to the control circuitry, gate drivers and step - down converter switches. connecting a ceramic bypass capacitor and a suitably large capacitor between vin and both of agnd and pgnd to eliminate switching noise and voltage ripple on the input to the ic. 3 agnd ground of mosfet gate drivers and control circuitry. 4 fb output feedback input. the apw714 5 senses the feedback voltage via fb and regulate s the v oltage at 0.8v. connecting fb with a resistor - divider from the converter?s output sets the output voltage from 0.8v to vin. 5 comp output of the error amplifier. connect ing a series rc network from comp to gnd to compensate the regulation control loop. in some cases, an additional capacitor from comp to gnd is required. 6 en enable input. en is a digital input that turns the regulator on or off. drive en high to turn on the regulator, drive it low to turn it off. connect ing this pin to vin if it is not us ed. 7 lx power switching output. lx is the junction of the high - side and low - side power mosfets to supply power to the output lc filter. 8 pgnd power ground of the apw714 5 , which is the source of the n - channel power mosfet. connect this pin to the system ground with lowest impedance. 9 (exposed pad) lx power switching output. lx is the drain of the p - channel mosfet to supply power to the output. the exposed pad provides current with lower impedance than the pin 7. connect ing the pad to output lc filter v ia a top - layer thermal pad on pcbs. the pcb will be a heat sink of the ic. b l o c k d i a g r a m lx gate control v ref soft-start / soft-stop and fault logic error amplifier fb inhibit 50%v ref uvp pgnd por soft-start / soft-stop power-on- reset v in v in enable current sense amplifier en comp ovp 118%v ref oscillator 500khz slope compensation current compartor 1.5v vin over - temperature protection zero-crossing comparator current limit fb ug lg gate driver gate driver agnd gm
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 3 - s e p . , 2 0 0 8 a p w 7 1 4 5 w w w . a n p e c . c o m . t w 1 1 t y p i c a l a p p l i c a t i o n c i r c u i t 1. 4.3~14v single power input step-down converter (with a ceramic output capacitor) a. cost-effective feedback compensation (c4 is no connection) v in (v) v out (v) l1( m f) c2( m f) c2 esr(m w ) r1(k w ) r2(k w ) r3(k w ) c3(pf) 12 5 6.8 22 5 63.0 12 33.0 820 12 5 6.8 44 3 63.0 12 68.0 820 12 3.3 4.7 22 5 46.9 15 27.0 1000 12 3.3 4.7 44 3 46.9 15 56.0 1000 12 2 3.3 22 5 30.0 20 18.0 1800 12 2 3.3 44 3 30.0 20 33.0 1800 12 1.8 3.3 22 5 18.8 15 15.0 1800 12 1.8 3.3 44 3 18.8 15 30.0 1800 5 3.3 2.2 22 5 46.9 15 27.0 470 5 3.3 2.2 44 3 46.9 15 56.0 470 5 1.8 2.2 22 5 25.0 20 15.0 820 5 1.8 2.2 44 3 25.0 20 30.0 820 5 1.5 2.2 22 5 21.9 25 12.0 1000 5 1.5 2.2 44 3 21.9 25 24.0 1000 5 1.2 2.2 22 5 7.5 15 10.0 1200 5 1.2 2.2 44 3 7.5 15 20.0 1200 lx en 6 vin 2 agnd 3 comp 5 9 u1 APW7145 fb 4 v out l1 3a v in c1 lx 7 enable shutdown pgnd 8 c2 r1 ? 1% r2 ? 1% c4 ( ? 30%, optional) r3 ( ? 5 %) c3 ( ? 30%)
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 3 - s e p . , 2 0 0 8 a p w 7 1 4 5 w w w . a n p e c . c o m . t w 1 2 2. +12v single power input step-down converter (with an electrolytic output capacitor) t y p i c a l a p p l i c a t i o n c i r c u i t ( c o n t . ) b. fast-transient-response feedback compensation (c4 is connected) v in (v) v out (v) l1( m h) c2( m f ) c2 esr(m w ) r1(k w ) r2(k w ) r3(k w ) c3(pf) c4(pf) 12 5 6.8 22 5 63.0 12 43 680.0 27 12 5 6.8 44 3 63.0 12 82 680.0 27 12 3.3 4.7 22 5 46.9 15 27 1000.0 27 12 3.3 4.7 44 3 46.9 15 56 1000.0 27 12 2 3.3 22 5 30.0 20 18 1800.0 27 12 2 3.3 44 3 30.0 20 33 1800.0 27 12 1.8 3.3 22 5 18.8 15 15 1800.0 33 12 1.8 3.3 44 3 18.8 15 30 1800.0 33 5 3.3 2.2 22 5 46.9 15 27 470.0 27 5 3.3 2.2 44 3 46.9 15 56 470.0 27 5 1.8 2.2 22 5 25.0 20 15 820.0 56 5 1.8 2.2 44 3 25.0 20 30 820.0 56 5 1.5 2.2 22 5 22 25 12 1000 56 5 1.5 2.2 44 3 22 25 24 1000 56 5 1.2 2.2 22 5 7.5 15 10 1200 180 5 1.2 2.2 44 3 7.5 15 20 1200 270 lx en 6 vin agnd comp 5 9 u1 APW7145 fb 4 l1 4.7 m h /3a v in 12v c1 2.2 m f lx 7 enable shutdown pgnd 8 c2 470 m f (esr=30m w ) r1 46.9k 1% r2 15k 1% r3 100 k c3 1000pf c5 470 m f v out 3.3v/3a 2 3
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 3 - s e p . , 2 0 0 8 a p w 7 1 4 5 w w w . a n p e c . c o m . t w 1 3 f u n c t i o n d e s c r i p t i o n v i n p o w e r - o n - r e s e t ( p o r ) t h e a p w 7 1 4 5 k e e p s m o n i t o r i n g t h e v o l t a g e o n t h e v i n p i n t o p r e v e n t w r o n g l o g i c o p e r a t i o n s w h i c h m a y o c c u r w h e n v i n v o l t a g e i s n o t h i g h e n o u g h f o r t h e i n t e r n a l c o n - t r o l c i r c u i t r y t o o p e r a t e . t h e v i n p o r h a s a r i s i n g t h r e s h - o l d o f 4 . 1 v ( t y p i c a l ) w i t h 0 . 5 v o f h y s t e r e s i s . d u r i n g s t a r t - u p , t h e v i n v o l t a g e m u s t e x c e e d t h e e n a b l e v o l t a g e t h r e s h o l d . t h e n , t h e i c s t a r t s a s t a r t - u p p r o c e s s a n d r a m p s u p t h e o u t p u t v o l t a g e t o t h e v o l t a g e t a r g e t . d i g i t a l s o f t - s t a r t t h e a p w 7 1 4 5 h a s a b u i l t - i n d i g i t a l s o f t - s t a r t t o c o n t r o l t h e r i s e r a t e o f t h e o u t p u t v o l t a g e a n d l i m i t t h e i n p u t c u r r e n t s u r g e d u r i n g s t a r t - u p . d u r i n g s o f t - s t a r t , a n i n t e r n a l v o l t a g e r a m p ( v r a m p ) , c o n n e c t e d t o o n e o f t h e p o s i t i v e i n p u t s o f t h e e r r o r a m p l i f i e r , r i s e s u p f r o m 0 v t o 0 . 9 5 v t o r e p l a c e t h e r e f e r e n c e v o l t a g e ( 0 . 8 v ) u n t i l t h e v o l t a g e r a m p r e a c h e s t h e r e f e r e n c e v o l t a g e . d u r i n g s o f t - s t a r t w i t h o u t o u t p u t o v e r v o l t a g e , t h e a p w 7 1 4 5 c o n v e r t e r ? s s i n k i n g c a p a b i l i t y i s d i s a b l e d u n t i l t h e o u t p u t v o l t a g e r e a c h e s t h e v o l t a g e t a r g e t . d i g i t a l s o f t - s t o p a t t h e m o m e n t o f s h u t d o w n c o n t r o l l e d b y e n s i g n a l , u n d e r v o l t a g e e v e n t , o r o v e r - t e m p e r a t u r e p r o t e c t i o n , t h e a p w 7 1 4 5 i n i t i a t e s a d i g i t a l s o f t - s t o p p r o c e s s t o d i s c h a r g e t h e o u t p u t v o l t a g e i n t h e o u t p u t c a p a c i t o r s . c e r t a i n l y , t h e l o a d c u r r e n t a l s o d i s c h a r g e s t h e o u t p u t v o l t a g e . d u r i n g s o f t - s t o p , t h e i n t e r n a l v o l t a g e r a m p ( v r a m p ) f a l l s d o w n f r o m 0 . 9 5 v t o 0 v t o r e p l a c e t h e r e f e r e n c e v o l t a g e . t h e r e f o r e , t h e o u t p u t v o l t a g e f a l l s d o w n s l o w l y a t l i g h t l o a d . a f t e r t h e s o f t - s t o p i n t e r v a l e l a p s e s , t h e s o f t - s t o p p r o c e s s e n d s a n d t h e t h e i c t u r n s o n t h e l o w - s i d e p o w e r m o s f e t . o u t p u t u n d e r v o l t a g e p r o t e c t i o n ( u v p ) i n t h e o p e r a t i o n a l p r o c e s s , i f a s h o r t - c i r c u i t o c c u r s , t h e o u t p u t v o l t a g e w i l l d r o p q u i c k l y . b e f o r e t h e c u r r e n t - l i m i t c i r c u i t r e s p o n d s , t h e o u t p u t v o l t a g e w i l l f a l l o u t o f t h e r e - q u i r e d r e g u l a t i o n r a n g e . t h e u n d e r v o l t a g e c o n t i n u a l l y m o n i t o r s t h e f b v o l t a g e a f t e r s o f t - s t a r t i s c o m p l e t e d . i f a l o a d s t e p i s s t r o n g e n o u g h t o p u l l t h e o u t p u t v o l t a g e l o w e r t h a n t h e u n d e r - v o l t a g e t h r e s h o l d , t h e i c s h u t s d o w n c o n v e r t e r ? s o u t p u t . t h e u n d e r - v o l t a g e t h r e s h o l d i s 5 0 % o f t h e n o m i n a l o u t - p u t v o l t a g e . t h e u n d e r v o l t a g e c o m p a r a t o r h a s a b u i l t - i n 2 m s n o i s e f i l t e r t o p r e v e n t t h e c h i p s f r o m w r o n g u v p s h u t - d o w n c a u s e d b y n o i s e . t h e u n d e r - v o l t a g e p r o t e c t i o n w o r k s i n a h i c c u p m o d e w i t h o u t l a t c h e d s h u t d o w n . t h e i c w i l l i n i t i a t e a n e w s o f t - s t a r t p r o c e s s a t t h e e n d o f t h e p r e c e d i n g d e l a y . o v e r - v o l t a g e p r o t e c t i o n ( o v p ) t h e o v e r - v o l t a g e f u n c t i o n m o n i t o r s t h e o u t p u t v o l t a g e b y f b p i n . w h e n t h e f b v o l t a g e i n c r e a s e o v e r 1 1 8 % o f t h e r e f e r e n c e v o l t a g e d u e t o t h e h i g h - s i d e m o s f e t f a i l u r e , o r f o r o t h e r r e a s o n s , t h e o v e r - v o l t a g e p r o t e c t i o n c o m p a r a - t o r w i l l f o r c e t h e l o w - s i d e m o s f e t g a t e d r i v e r h i g h . t h i s a c t i o n a c t i v e l y p u l l s d o w n t h e o u t p u t v o l t a g e a n d e v e n t u - a l l y a t t e m p t s t o b l o w t h e i n t e r n a l b o n d i n g w i r e s . a s s o o n a s t h e o u t p u t v o l t a g e i s w i t h i n r e g u l a t i o n , t h e o v p c o m - p a r a t o r i s d i s e n g a g e d . t h e c h i p w i l l r e s t o r e i t s n o r m a l o p e r a t i o n . t h i s o v p s c h e m e o n l y c l a m p s t h e v o l t a g e o v e r - s h o o t a n d d o e s n o t i n v e r t t h e o u t p u t v o l t a g e w h e n o t h e r - w i s e a c t i v a t e d w i t h a c o n t i n u o u s l y h i g h o u t p u t f r o m l o w - s i d e m o s f e t d r i v e r - a c o m m o n p r o b l e m f o r o v p s c h e m e s w i t h a l a t c h . o v e r - t e m p e r a t u r e p r o t e c t i o n ( o t p ) t h e o v e r - t e m p e r a t u r e c i r c u i t l i m i t s t h e j u n c t i o n t e m p e r a - t u r e o f t h e a p w 7 1 4 5 . w h e n t h e j u n c t i o n t e m p e r a t u r e e x - c e e d s t j = + 1 5 0 o c , a t h e r m a l s e n s o r t u r n s o f f t h e b o t h p o w e r m o s f e t s , a l l o w i n g t h e d e v i c e s t o c o o l . t h e t h e r - m a l s e n s o r a l l o w s t h e c o n v e r t e r s t o s t a r t a s t a r t - u p p r o - c e s s a n d r e g u l a t e t h e o u t p u t v o l t a g e a g a i n a f t e r t h e j u n c - t i o n t e m p e r a t u r e c o o l s b y 4 0 o c . t h e o t p i s d e s i g n e d w i t h a 4 0 o c h y s t e r e s i s t o l o w e r t h e a v e r a g e t j d u r i n g c o n t i n u o u s t h e r m a l o v e r l o a d c o n d i t i o n s , i n c r e a s i n g l i f e - t i m e o f t h e a p w 7 1 4 5 . e n a b l e / s h u t d o w n driving en to the ground initiates a soft-stop process and then places the APW7145 in shutdown. when in shutdown, after the soft-stop process is completed, the internal power mosfets turns off, all internal circuitry shuts down and the quiescent supply current reduces to less than 3ma.
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 3 - s e p . , 2 0 0 8 a p w 7 1 4 5 w w w . a n p e c . c o m . t w 1 4 f u n c t i o n d e s c r i p t i o n ( c o n t . ) c u r r e n t - l i m i t p r o t e c t i o n t h e a p w 7 1 4 5 m o n i t o r s t h e o u t p u t c u r r e n t , f l o w i n g t h r o u g h t h e h i g h - s i d e p o w e r m o s f e t , a n d l i m i t s t h e c u r r e n t p e a k a t c u r r e n t - l i m i t l e v e l t o p r e v e n t l o a d s a n d t h e i c f r o m d a m - a g e s d u r i n g o v e r l o a d o r s h o r t - c i r c u i t c o n d i t i o n s . f r e q u e n c y f o l d b a c k t h e f o l d b a c k f r e q u e n c y i s c o n t r o l l e d b y t h e f b v o l t a g e . w h e n t h e o u t p u t i s s h o r t e n e d t o t h e g r o u n d , t h e f r e q u e n c y o f t h e o s c i l l a t o r w i l l b e r e d u c e d t o 8 0 k h z . t h i s l o w e r f r e - q u e n c y a l l o w s t h e i n d u c t o r c u r r e n t t o s a f e l y d i s c h a r g e , t h e r e b y p r e v e n t i n g c u r r e n t r u n a w a y . t h e o s c i l l a t o r ? s f r e - q u e n c y w i l l g r a d u a l l y i n c r e a s e t o i t s d e s i g n e d r a t e w h e n t h e f e e d b a c k v o l t a g e o n f b a g a i n a p p r o a c h e s 0 . 8 v .
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 3 - s e p . , 2 0 0 8 a p w 7 1 4 5 w w w . a n p e c . c o m . t w 1 5 a p p l i c a t i o n i n f o r m a t i o n (v) ) r2 r1 (1 0.8 v out + = s e t t i n g o u t p u t v o l t a g e t h e r e g u l a t e d o u t p u t v o l t a g e i s d e t e r m i n e d b y : s u g g e s t e d r 2 i s i n t h e r a n g e f r o m 1 k t o 2 0 k w . f o r p o r t a b l e a p p l i c a t i o n s , a 1 0 k r e s i s t o r i s s u g g e s t e d f o r r 2 . t o p r e v e n t s t r a y p i c k u p , p l e a s e l o c a t e r e s i s t o r s r 1 a n d r 2 c l o s e t o a p w 7 1 4 5 . i n p u t c a p a c i t o r s e l e c t i o n u s e s m a l l c e r a m i c c a p a c i t o r s f o r h i g h f r e q u e n c y d e c o u p l i n g a n d b u l k c a p a c i t o r s t o s u p p l y t h e s u r g e c u r r e n t n e e d e d e a c h t i m e t h e p - c h a n n e l p o w e r m o s f e t ( q 1 ) t u r n s o n . p l a c e t h e s m a l l c e r a m i c c a p a c i t o r s p h y s i c a l l y c l o s e t o t h e v i n a n d b e t w e e n t h e v i n a n d t h e g n d . t h e i m p o r t a n t p a r a m e t e r s f o r t h e b u l k i n p u t c a p a c i t o r a r e t h e v o l t a g e r a t i n g a n d t h e r m s c u r r e n t r a t i n g . f o r r e l i a b l e o p e r a t i o n , s e l e c t t h e b u l k c a p a c i t o r w i t h v o l t a g e a n d c u r r e n t r a t i n g s a b o v e t h e m a x i m u m i n p u t v o l t a g e a n d l a r g - e s t r m s c u r r e n t r e q u i r e d b y t h e c i r c u i t . t h e c a p a c i t o r v o l t - a g e r a t i n g s h o u l d b e a t l e a s t 1 . 2 5 t i m e s g r e a t e r t h a n t h e m a x i m u m i n p u t v o l t a g e a n d a v o l t a g e r a t i n g o f 1 . 5 t i m e s i s a c o n s e r v a t i v e g u i d e l i n e . t h e r m s c u r r e n t ( i r m s ) o f t h e b u l k i n p u t c a p a c i t o r i s c a l c u l a t e d a s t h e f o l l o w i n g e q u a t i o n : (a) d) - (1 d i i out rms = w h e r e d i s t h e d u t y c y c l e o f t h e p o w e r m o s f e t . f o r a t h r o u g h h o l e d e s i g n , s e v e r a l e l e c t r o l y t i c c a p a c i t o r s m a y b e n e e d e d . f o r s u r f a c e m o u n t d e s i g n s , s o l i d t a n t a - l u m c a p a c i t o r s c a n b e u s e d , b u t c a u t i o n m u s t b e e x e r - c i s e d w i t h r e g a r d t o t h e c a p a c i t o r s u r g e c u r r e n t r a t i n g . f i g u r e 1 . c o n v e r t e r w a v e f o r m s o u t p u t c a p a c i t o r s e l e c t i o n a n o u t p u t c a p a c i t o r i s r e q u i r e d t o f i l t e r t h e o u t p u t a n d s u p - p l y t h e l o a d t r a n s i e n t c u r r e n t . t h e f i l t e r i n g r e q u i r e m e n t s a r e t h e f u n c t i o n o f t h e s w i t c h i n g f r e q u e n c y a n d t h e r i p p l e c u r r e n t ( d i ) . t h e o u t p u t r i p p l e i s t h e s u m o f t h e v o l t a g e s , h a v i n g p h a s e s h i f t , a c r o s s t h e e s r , a n d t h e i d e a l o u t p u t c a p a c i t o r . t h e p e a k - t o - p e a k v o l t a g e o f t h e e s r i s c a l c u - l a t e d a s t h e f o l l o w i n g e q u a t i o n s : . . . . . . . . . . . ( 1 ) . . . . . . . . . . . ( 2 ) l f d) - (1 v i osc out = d t h e p e a k - t o - p e a k v o l t a g e o f t h e i d e a l o u t p u t c a p a c i t o r i s c a l c u l a t e d a s t h e f o l l o w i n g e q u a t i o n : v in v out c in c out l q1 lx esr i l i out i q1 i cout vin q2 i out v lx t=1/f osc i l i q1 i cout i out i i dt v out v out v v d in out = . . . . . . . . . . . ( 3 ) esr . i v esr d = (v) c f 8 i v out osc cout d = d . . . . . . . . . . . ( 4 ) f o r t h e a p p l i c a t i o n s u s i n g b u l k c a p a c i t o r s , t h e d v c o u t i s m u c h s m a l l e r t h a n t h e v e s r a n d c a n b e i g n o r e d . t h e r e f o r e , t h e a c p e a k - t o - p e a k o u t p u t v o l t a g e ( d v o u t ) i s s h o w n a s b e l o w : (v) esr i v out d = d . . . . . . . . . . . ( 5 )
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 3 - s e p . , 2 0 0 8 a p w 7 1 4 5 w w w . a n p e c . c o m . t w 1 6 a p p l i c a t i o n i n f o r m a t i o n ( c o n t . ) o u t p u t c a p a c i t o r s e l e c t i o n ( c o n t . ) w h e r e f o r t h e a p p l i c a t i o n s u s i n g c e r a m i c c a p a c i t o r s , t h e v e s r i s m u c h s m a l l e r t h a n t h e d v c o u t a n d c a n b e i g n o r e d . t h e r e f o r e , t h e a c p e a k - t o - p e a k o u t p u t v o l t a g e ( d v o u t ) i s c l o s e t o d v c o u t . t h e l o a d t r a n s i e n t r e q u i r e m e n t s a r e t h e f u n c t i o n o f t h e s l e w r a t e ( d i / d t ) a n d d i s e n g a g e d \ t h e m a g n i t u d e o f t h e t r a n - s i e n t l o a d c u r r e n t . t h e s e r e q u i r e m e n t s a r e g e n e r a l l y m e t w i t h a m i x o f c a p a c i t o r s a n d c a r e f u l l a y o u t . h i g h f r e q u e n c y c a p a c i t o r s i n i t i a l l y s u p p l y t h e t r a n s i e n t a n d s l o w t h e c u r - r e n t l o a d r a t e s e e n b y t h e b u l k c a p a c i t o r s . t h e b u l k f i l t e r c a p a c i t o r v a l u e s a r e g e n e r a l l y d e t e r m i n e d b y t h e e s r ( e f f e c t i v e s e r i e s r e s i s t a n c e ) a n d v o l t a g e r a t i n g r e q u i r e - m e n t s r a t h e r t h a n a c t u a l c a p a c i t a n c e r e q u i r e m e n t s . h i g h f r e q u e n c y d e c o u p l i n g c a p a c i t o r s s h o u l d b e p l a c e d a s c l o s e t o t h e p o w e r p i n s o f t h e l o a d a s p h y s i c a l l y p o s s i b l e . b e c a r e f u l n o t t o a d d i n d u c t a n c e i n t h e c i r c u i t b o a r d w i r i n g t h a t c o u l d c a n c e l t h e u s e f u l n e s s o f t h e s e l o w i n d u c t a n c e c o m p o n e n t s . a n a l u m i n u m e l e c t r o l y t i c c a p a c i t o r ? s e s r v a l u e i s r e l a t e d t o t h e c a s e s i z e w i t h l o w e r e s r a v a i l a b l e i n l a r g e r c a s e s i z e s . h o w e v e r , t h e e q u i v a l e n t s e r i e s i n d u c t a n c e ( e s l ) o f t h e s e c a p a c i t o r s i n c r e a s e s w i t h c a s e s i z e a n d c a n r e d u c e t h e u s e f u l n e s s o f t h e c a p a c i t o r t o h i g h s l e w - r a t e t r a n s i e n t l o a d i n g . i n d u c t o r v a l u e c a l c u l a t i o n . . . . . . . . . . . ( 6 ) in(max) in v v = t h e o p e r a t i n g f r e q u e n c y a n d i n d u c t o r s e l e c t i o n a r e i n - t e r r e l a t e d i n t h a t h i g h e r o p e r a t i n g f r e q u e n c i e s p e r m i t t h e u s e o f a s m a l l e r i n d u c t o r f o r t h e s a m e a m o u n t o f i n d u c t o r r i p p l e c u r r e n t . h o w e v e r , t h i s i s a t t h e e x p e n s e o f e f f i c i e n c y d u e t o a n i n c r e a s e i n m o s f e t g a t e c h a r g e l o s s e s . t h e e q u a t i o n ( 2 ) s h o w s t h a t t h e i n d u c t a n c e v a l u e h a s a d i r e c t e f f e c t o n r i p p l e c u r r e n t . a c c e p t i n g l a r g e r v a l u e s o f r i p p l e c u r r e n t a l l o w s t h e u s e o f l o w i n d u c t a n c e s , b u t r e s u l t s i n h i g h e r o u t p u t v o l t a g e r i p p l e a n d g r e a t e r c o r e l o s s e s . a r e a s o n a b l e s t a r t i n g p o i n t f o r s e t t i n g r i p p l e c u r r e n t i s d i 0 . 4 i o u t ( m a x ) . p l e a s e b e n o - t i c e d t h a t t h e m a x i m u m r i p p l e c u r r e n t o c c u r s a t t h e m a x i - m u m i n p u t v o l t a g e . t h e m i n i m u m i n d u c t a n c e o f t h e i n - d u c t o r i s c a l c u l a t e d b y u s i n g t h e f o l l o w i n g e q u a t i o n : layout consideration i n h i g h p o w e r s w i t c h i n g r e g u l a t o r , a c o r r e c t l a y o u t i s i m p o r t a n t t o e n s u r e p r o p e r o p e r a t i o n o f t h e r e g u l a t o r . i n g e n e r a l , i n t e r c o n n e c t i n g i m p e d a n c e s h o u l d b e m i n i m i z e d b y u s i n g s h o r t a n d w i d e p r i n t e d c i r c u i t t r a c e s . s i g n a l a n d p o w e r g r o u n d s a r e t o b e k e p t s e p a r a t i n g a n d f i - n a l l y c o m b i n e d u s i n g g r o u n d p l a n e c o n s t r u c t i o n o r s i n g l e p o i n t g r o u n d i n g . f i g u r e 2 i l l u s t r a t e s t h e l a y o u t , w i t h b o l d l i n e s i n d i c a t i n g h i g h c u r r e n t p a t h s . c o m p o n e n t s a l o n g t h e b o l d l i n e s s h o u l d b e p l a c e d c l o s e t o g e t h e r . b e l o w i s a c h e c k l i s t f o r y o u r l a y o u t : 1 . f i r s t l y , t o i n i t i a l t h e l a y o u t b y p l a c i n g t h e p o w e r c o m p o n e n t s . o r i e n t t h e p o w e r c i r c u i t r y t o a c h i e v e a c l e a n p o w e r f l o w p a t h . i f p o s s i b l e , m a k e a l l t h e c o n - n e c t i o n s o n o n e s i d e o f t h e p c b w i t h w i d e a n d c o p - p e r f i l l e d a r e a s . f i g u r e 2 . c u r r e n t p a t h d i a g r a m 1.2 v l 500000 ) v - (v v in out in out (h) v 600000 ) v - (v v l in out in out 3 2 . i n f i g u r e 2 , t h e l o o p s w i t h s a m e c o l o r b o l d l i n e s c o n - d u c t h i g h s l e w r a t e c u r r e n t . t h e s e i n t e r c o n n e c t i n g i m - p e d a n c e s s h o u l d b e m i n i m i z e d b y u s i n g w i d e a n d s h o r t p r i n t e d c i r c u i t t r a c e s . v out lx en 6 vin 2 agnd 3 comp 5 9 u1 APW7145 fb 4 c3 r3 r1 lx 7 pgnd 8 r 2 l 1 c 2 load c 1 + v in - feedback divider c4(optional) compensation network 1 nc + -
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 3 - s e p . , 2 0 0 8 a p w 7 1 4 5 w w w . a n p e c . c o m . t w 1 7 l a y o u t c o n s i d e r a t i o n ( c o n t . ) 4 . p l a c e t h e d e c o u p l i n g c e r a m i c c a p a c i t o r c 1 n e a r t h e v i n a s c l o s e a s p o s s i b l e . u s e a w i d e p o w e r g r o u n d p l a n e t o c o n n e c t t h e c 1 a n d c 2 t o p r o v i d e a l o w i m - p e d a n c e p a t h b e t w e e n t h e c o m p o n e n t s f o r l a r g e a n d h i g h s l e w r a t e c u r r e n t . f i g u r e 3 . r e c o m m e n d e d l a y o u t d i a g r a m 3 . k e e p t h e s e n s i t i v e s m a l l s i g n a l n o d e s ( f b a n d c o m p ) a w a y f r o m s w i t c h i n g n o d e s ( l x o r o t h e r s ) o n t h e p c b . t h e r e f o r e , p l a c e t h e f e e d b a c k d i v i d e r a n d t h e f e e d - b a c k c o m p e n s a t i o n n e t w o r k c l o s e t o t h e i c t o a v o i d s w i t c h i n g n o i s e . c o n n e c t t h e g r o u n d o f f e e d b a c k d i v i d e r d i r e c t l y t o t h e a g n d p i n o f t h e i c u s i n g a d e d i c a t e d g r o u n d t r a c e . a p p l i c a t i o n i n f o r m a t i o n ( c o n t . ) ground sop-8p c1 l1 v in APW7145 v out v lx ground 1 2 3 4 for dissipating h eat 5 6 7 8 c2 ground dfn4x4 c1 l1 v in APW7145 v out v lx ground 1 2 3 4 for dissipating h eat 5 6 7 8 c2
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 3 - s e p . , 2 0 0 8 a p w 7 1 4 5 w w w . a n p e c . c o m . t w 1 8 p a c k a g e i n f o r m a t i o n s o p - 8 p 0.020 0.010 0.020 0.050 0.006 0.063 max. 0.40 l 0 e e h e1 0.25 d c b 0.17 0.31 0.016 1.27 0.50 1.27 bsc 0.51 0.25 0.050 bsc 0.010 0.012 0.007 millimeters min. s y m b o l a1 a2 a 0.00 1.25 sop-8p max. 0.15 1.60 min. 0.000 0.049 inches d1 2.25 0.098 2.00 0.079 e2 3.50 3.00 0.138 0.118 8 o 0 o 8 o 0 o h x 4 5 d e e e 1 see view a c b d1 e 2 thermal pad a 0 l view a 0 . 2 5 seating plane gauge plane a 1 a 2 inter-lead flash and protrusions shall not exceed 10 mil per side. note : 1. follow jedec ms-012 ba. 2. dimension "d" does not include mold flash, protrusions or gate burrs. mold flash, protrusion or gate burrs shall not exceed 6 mil per side . 3. dimension "e" does not include inter-lead flash or protrusions. 4.80 5.00 5.80 6.20 3.80 4.00 0.244 0.228 0.157 0.150 0.197 0.189
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 3 - s e p . , 2 0 0 8 a p w 7 1 4 5 w w w . a n p e c . c o m . t w 1 9 p a c k a g e i n f o r m a t i o n d f n 4 x 4 - 8 a b a1 a3 s y m b o l min. max. 1.00 0.00 0.25 0.35 3.10 3.30 0.05 2.40 a a1 b d d2 e e2 e l millimeters a3 0.20 ref dfn4x4-8 0.40 0.60 2.60 0.008 ref min. max. inches 0.039 0.000 0.010 0.014 0.122 0.130 0.094 0.016 0.024 0.80 0.102 0.031 0.002 0.80 bsc 0.031 bsc 0.20 0.008 k 3.90 4.10 0.154 0.161 3.90 4.10 0.154 0.161 pin 1 d e pin 1 corner e 2 d2 e l k note : 1. followed from jedec mo-229 vggb.
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 3 - s e p . , 2 0 0 8 a p w 7 1 4 5 w w w . a n p e c . c o m . t w 2 0 application a h t1 c d d w e1 f 330.0 ? 2.00 50 min. 12.4+2.00 - 0.00 13.0+0.50 - 0.20 1.5 min. 20.2 min. 12.0 ? 0.30 1.75 ? 0.10 5.5 ? 0.05 p 0 p1 p 2 d 0 d1 t a 0 b 0 k 0 sop - 8(p) 4.0 ? 0.10 8.0 ? 0.10 2.0 ? 0.05 1.5+0.10 - 0.00 1.5 min. 0.6+0.00 - 0 .40 6.40 ? 0.20 5.20 ? 0.20 2.10 ? 0.20 application a h t1 c d d w e1 f 330.0 ? 2.00 50 min. 12.4+2.00 - 0.00 13.0+0.50 - 0.20 1.5 min. 20.2 min. 12.0 ? 0.30 1.75 ? 0.10 5.5 ? 0.05 p 0 p1 p 2 d 0 d1 t a 0 b 0 k 0 dfn4x4 - 8 4.0 ? 0.10 8.0 ? 0.10 2.0 ? 0.05 1.5+ 0.10 - 0.00 1.5 min. 0.6+0.00 - 0.40 4.30 ? 0.20 4.30 ? 0.20 1.30 ? 0.20 (mm) d e v i c e s p e r u n i t c a r r i e r t a p e & r e e l d i m e n s i o n s package type unit quantity sop - 8 p tape & reel 2500 dfn4x4 - 8 tape & reel 3000 a e 1 a b w f t p0 od0 b a0 p2 k0 b 0 section b-b section a-a od1 p1 h t1 a d
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 3 - s e p . , 2 0 0 8 a p w 7 1 4 5 w w w . a n p e c . c o m . t w 2 1 t a p i n g d i r e c t i o n i n f o r m a t i o n s o p - 8 p d f n 4 x 4 - 8 user direction of feed user direction of feed
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 3 - s e p . , 2 0 0 8 a p w 7 1 4 5 w w w . a n p e c . c o m . t w 2 2 r e f l o w c o n d i t i o n ( i r / c o n v e c t i o n o r v p r r e f l o w ) c l a s s i f i c a t i o n r e f l o w p r o f i l e s profile feature sn - pb eutectic assembly pb - free assembly average ramp - up rate (t l to t p ) 3 c/second max. 3 c/second max. preheat - temperature min (tsmin) - temperature max (tsmax) - time (min to max) (ts) 100 c 150 c 60 - 120 seconds 150 c 200 c 60 - 180 seconds time maintained above: - temperature (t l ) - time (t l ) 183 c 60 - 150 seconds 217 c 60 - 150 seconds peak /classification temperature (tp) see table 1 see table 2 time within 5 c of actual peak temperature (tp) 10 - 30 seconds 20 - 40 seconds ramp - down rate 6 c/sec ond max. 6 c/second max. time 25 c to peak temperature 6 minutes max. 8 minutes max. notes: all temperatures refer to topside of the package. measured on the body surface. test item method description solderability mil - std - 883d - 2003 245 c, 5 sec holt mil - std - 883d - 1005.7 1000 hrs bias @125 c pct jesd - 22 - b, a102 168 hrs, 100 % rh, 121 c tst mil - std - 883d - 1011.9 - 65 c~150 c, 200 cycles esd mil - std - 883d - 3015.7 vhbm > 2kv, vmm > 200v latch - up jesd 78 10ms, 1 tr > 100ma r e l i a b i l i t y t e s t p r o g r a m t 25 c to peak tp ramp-up t l ramp-down ts preheat tsmax tsmin t l t p 25 t e m p e r a t u r e time critical zone t l to t p
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 3 - s e p . , 2 0 0 8 a p w 7 1 4 5 w w w . a n p e c . c o m . t w 2 3 table 2. pb - free process ? package classification reflow temperatures package thickness volume mm 3 <350 volume mm 3 350 - 2000 volume mm 3 >2000 <1.6 mm 260 +0 c* 260 +0 c* 260 +0 c* 1.6 mm ? 2.5 mm 260 +0 c* 250 +0 c* 245 +0 c* 3 2.5 mm 250 +0 c* 245 +0 c* 245 +0 c* *tolerance: the device manufacturer/supplier shall assure process compatibility up to and including the stated classification temperature (this means peak reflow temperature +0 c. for example 260 c+0 c) at the rated msl level. table 1. snpb eutectic process ? package peak reflow temperature s package thickness volume mm 3 <350 volume mm 3 3 350 <2.5 mm 240 +0/ - 5 c 225 +0/ - 5 c 3 2.5 mm 225 +0/ - 5 c 225 +0/ - 5 c c l a s s i f i c a t i o n r e f l o w p r o f i l e s ( c o n t . ) c u s t o m e r s e r v i c e a n p e c e l e c t r o n i c s c o r p . head office : no.6, dusing 1st road, sbip, hsin-chu, taiwan tel : 886-3-5642000 fax : 886-3-5642050 t a i p e i b r a n c h : 2 f , n o . 1 1 , l a n e 2 1 8 , s e c 2 j h o n g s i n g r d . , s i n d i a n c i t y , t a i p e i c o u n t y 2 3 1 4 6 , t a i w a n t e l : 8 8 6 - 2 - 2 9 1 0 - 3 8 3 8 f a x : 8 8 6 - 2 - 2 9 1 7 - 3 8 3 8

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