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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 . 2 - m a y . , 2 0 1 3 a p w 8 8 2 4 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 . 1 . 5 m h z , 1 a s y n c h r o n o u s b u c k r e g u l a t o r t h e a p w 8 8 2 4 i s a h i g h e f f i c i e n c y m o n o l i t h i c s y n c h r o - n o u s b u c k r e g u l a t o r . a p w 8 8 2 4 o p e r a t e s w i t h a c o n s t a n t 1 . 5 m h z s w i t c h i n g f r e q u e n c y a n d u s i n g t h e i n d u c t o r c u r - r e n t a s a c o n t r o l l e d q u a n t i t y i n t h e c u r r e n t m o d e a r c h i t e c t u r e . t h e 2 . 7 v t o 5 . 5 v i n p u t v o l t a g e r a n g e m a k e s t h e a p w 8 8 2 4 i d e a l l y s u i t e d f o r s i n g l e l i - i o n b a t t e r y p o w - e r e d a p p l i c a t i o n s . 1 0 0 % d u t y c y c l e p r o v i d e s l o w d r o p o u t o p e r a t i o n , e x t e n d i n g b a t t e r y l i f e i n p o r t a b l e e l e c t r i c a l d e v i c e s . t h e i n t e r n a l l y f i x e d 1 . 5 m h z o p e r a t i n g f r e q u e n c y a l l o w s t h e u s e o f s m a l l s u r f a c e m o u n t i n d u c t o r s a n d c a p a c i t o r s . t h e s y n c h r o n o u s s w i t c h e s i n c l u d e d i n s i d e i n c r e a s e t h e e f f i c i e n c y a n d e l i m i n a t e t h e n e e d f o r a n e x - t e r n a l s c h o t t k y d i o d e . t h e a p w 8 8 2 4 i s a v a i l a b l e i n t s o t - 2 3 - 6 a p a c k a g e f e a t u r e s 1 a o u t p u t c u r r e n t w i d e 2 . 7 v ~ 5 . 5 v i n p u t v o l t a g e f i x e d 1 . 5 m h z s w i t c h i n g f r e q u e n c y l o w d r o p o u t o p e r a t i n g a t 1 0 0 % d u t y c y c l e l o w 2 5 m a q u i e s c e n t c u r r e n t i n t e g r a t e s y n c h r o n o u s r e c t i f i e r 0 . 6 v l o w r e f e r e n c e v o l t a g e < 0 . 5 m a i n p u t c u r r e n t d u r i n g s h u t d o w n current-mode operation with internal compen- sation - stable with ceramic output capacitors - fast line transient response o v e r - v o l t a g e p r o t e c t i o n under voltage protection over-temperature protection with hysteresis a v a i l a b l e i n a t s o t - 2 3 - 6 a p a c k a g e halogen and lead free available (rohs compliant) a p p l i c a t i o n s g e n e r a l d e s c r i p t i o n h d s t b b t m o u s e p n d i n s t r u m e n t p o r t a b l e i n s t r u m e n t s i m p l i f i e d a p p l i c a t i o n c i r c u i t vin gnd 2 en 1 fb 6 apw 8824 lx 3 v in 2 . 7 ~ 5 . 5 v v out 0 . 6 v ~ v in 0 ~ 1 a l 1 2 . 2 m h r 2 4 r 1 c 3 ( option ) c 1 10 m f ( mlcc ) c 2 10 f ( mlcc ) i in r 1 < 1 . 5 m w is recommended r 2 < 2 00 k w is recommended pg r 3 100 k 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 . 2 - m a y . , 2 0 1 3 a p w 8 8 2 4 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 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 d 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 symbol parameter rating unit v in input bias supply voltage ( vin to gnd) - 0.3 ~ 7 v e n, fb, lx and pg to gnd voltage - 0.3 ~ v in +0.3 v <30ns pulse width - 3 ~ 8 v lx lx voltage (lx to gnd) >30ns pulse width - 0.3 ~ v in +0.3 v maximum junction temperat ure 150 o c t stg storage temperature - 65 ~ 150 o c t sdr maximum lead soldering temperature (10 seconds ) 26 0 o c a b s o l u t e m a x i m u m r a t i n g s (note 1) n o t e 1 : s t r e s s e s b e y o n d t h o s e l i s t e d u n d e r ? a b s o l u t e m a x i m u m r a t i n g s ? m a y c a u s e p e r m a n e n t d a m a g e t o t h e d e v i c e . t h e s e a r e s t r e s s r a t i n g s o n l y a n d f u n c t i o n a l o p e r a t i o n o f t h e d e v i c e a t t h e s e o r a n y o t h e r c o n d i t i o n s b e y o n d t h o s e i n d i c a t e d i n t h e o p e r a t i o n a l s e c t i o n s o f t h e s p e c i f i c a t i o n s i s n o t i m p l i e d . e x p o s u r e t o a b s o l u t e m a x i m u m r a t i n g c o n d i t i o n s f o r e x t e n d e d p e r i o d s m a y a f f e c t d e v i c e r e l i a b i l i t y . apw 882 4 handling code temperature range package code assembly material apw 882 4 ct : x - date code package code ct : tsot - 23 - 6 a operating ambient temperature range i : - 40 to 85 o c handling code tr : tape & reel assembly material g : halogen and lead free device w 2 4 x 4 vin 6 fb gnd 2 lx 3 e n 1 tsot - 23 - 6 a top view apw 882 4 5 pg
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 . 2 - m a y . , 2 0 1 3 a p w 8 8 2 4 w w w . a n p e c . c o m . t w 3 symbol parameter typical value unit q ja junction - to - ambient resistance in free air (note 2) 220 o c/w note 2: q ja is measured with the component mounted on a high effective thermal conductivity test board in free air. t h e r m a l c h a r a c t e r i s t i c s 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 ( n o t e 3 ) symbol parameter range unit v in input bias supply voltage ( vin to gnd) 2.7 ~ 5.5 v v out converter output voltage 0.6 ~ v in v i out converter output current 0 ~ 1 a l1 converter output inductor 1.0 ~ 10 m h c in converter input capacitor 10 ~ 100 m f c o ut converter output capacitor 10 ~ 100 m f t a ambient temperature - 40 ~ 85 o c t j junction temperature - 4 0 ~ 125 o c n o t e 3 : r e f e r t o t h e a p p l i c a t i o n c i r c u i t f o r f u r t h e r i n f o r m a t i o n 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 apw8824 symbol parameter test conditions min typ max unit supply voltage and current v in input voltage range 2.7 - 5.5 v i dd quiescent current v fb = 0.66v - 2 5 40 m a i sd shutdown input current en = gnd - - 0.5 m a power - on - reset (por) and lockout voltage thresholds uvlo threshold 2.1 2.35 2.6 v uvlo hysteresis - 0.1 - v reference voltage t a = 25 o c 0.5 94 0.6 0.6 06 v v ref reference voltage t a = - 40~85 o c, t j = - 40~125 o c 0.5 91 - 0.6 09 v output voltage accuracy 0a < i out < 1a, v in > 3.6 v , t j =25 o c - 1 .5 - + 1 .5 % i fb fb input current - 50 - 50 na internal power mosfets f sw switching frequency v fb = 0.6v 1.2 1.5 1.8 mhz r p - fet main switch on r esistance i lx =200ma - 0.28 0.35 w r n - fet synchronous switch on r esistance i lx =200ma - 0.25 0.32 w n - fet switch leakage current v run = gnd, v lx = 5v - 0.1 - 0.1 m a p - fet switch leakage current v run = gnd, v lx = 0v - 0.1 - 0.1 m a unless otherwise specified, these specifications apply over v in =3.6v and t a = -40 ~ 85 o c. typical values are at t a =25 o c.
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 . 2 - m a y . , 2 0 1 3 a p w 8 8 2 4 w w w . a n p e c . c o m . t w 4 n o t e 4 : g u a r a n t e e d b y d e s i g n , n o t p r o d u c t i o n t e s t e d . 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 apw8824 symbol parameter test conditions min typ max unit internal power mosfets dead - time (note 4) - 5 - ns duty cycle 0 - 100 % protection i lim maximum inductor current limit i p - fet , 2. 7 v ?? v i n ?? 6v 2 2.5 3 a n - fet negative current limit - 1 - a v ovp o ver voltage protection threshold 115 120 125 %v ref ovp debounce time - 20 - m s v u vp under voltage protection threshold 57 66 75 %v ref uvp debounce time - 15 - m s pg in from lower (p g goes high) 87 90 9 3 %v ref pg low hy steresis (p g goes low) - 3 - %v ref pg in from high er (p g goes high) 115 120 125 %v ref p g threshold pg high hysteresis (p g goes low) - 3 - %v ref pg high to low debounce time (v out under shoot) - 60 - m s pg high to low debounce time (v out over shoot) - 80 - m s t otp over - temperature protection t j rising - 150 - c start - up and shutdown t ss soft - start duration (note 4) - 0.7 - ms en input high threshold v in = 2.7v~5.5v - - 1.5 v en input low threshold v in = 2.7v~5.5v 0.4 - - v en leakage current v en = 5 v, v in = 5v - 1 - 1 m a power good pull low resistance - 2 00 - w unless otherwise specified, these specifications apply over v in =3.6v and t a = -40 ~ 85 o c. typical values are at t a =25 o c.
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 . 2 - m a y . , 2 0 1 3 a p w 8 8 2 4 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 o u t p u t v o l t a g e ( v ) output voltage vs . temperature 1 . 475 1 . 485 1 . 495 1 . 505 1 . 515 1 . 525 temperature ( o c ) - 40 - 20 0 20 40 60 80 100 120 140 160 vout = 1 . 5 v switching frequency vs temperature s w i t c h i n g f r e q u e n c y ( m h z ) temperature ( o c ) - 40 - 20 0 20 40 60 80 100 120 140 160 1 . 3 1 . 35 1 . 4 1 . 45 1 . 5 1 . 55 1 . 6 e f f i c i e n c y ( % ) output current ( a ) vin = 3 . 3 v vin = 4 . 2 v vin = 5 v 0 0 . 2 0 . 4 0 . 6 0 . 8 1 60 65 70 75 80 85 90 95 efficiency vs . load current f sw = 1 . 5 mhz , v out = 1 . 8 v efficiency vs . load current e f f i c i e n c y ( % ) output current ( a ) vin = 3 . 3 v vin = 4 . 2 v vin = 5 v 60 65 70 75 80 85 90 95 0 0 . 2 0 . 4 0 . 6 0 . 8 1 f sw = 1 . 5 mhz , v out = 1 . 2 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 . 2 - m a y . , 2 0 1 3 a p w 8 8 2 4 w w w . a n p e c . c o m . t w 6 o p e r a t i n g w a v e f o r m s r e f e r t o t h e 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 . t h e t e s t c o n d i t i o n i s v i n = 5 v , t a = 2 5 o c u n l e s s o t h e r w i s e s p e c i f i e d . enable 1 4 ch 1 : v en , 5 v / div ch 2 : v out , 1 v / div ch 3 : v p g , 5 v / div time : 1 ms / div 2 v en i l ch 3 : i l , 1 a / div 3 v pg v out shutdown 1 2 v en i l ch 1 : v en , 5 v / div ch 2 : v out , 1 v / div ch 3 : v pg 5 v / div time : 20 m s / div ch 4 : i l , 1 a / div 3 4 v out v pg output ripple i l v out ch 1 : v out , 20 mv / div , ac ch 2 : v lx , 5 v / div time : 20 m s / div 1 2 ch 3 : i l , 1 a / div 3 v lx load transient i out v out 1 2 ch 1 : v out , 100 mv / div , ac ch 2 : v lx , 5 v / div time : 100 m s / div ch 3 : i out , 1 a / div 3 v lx
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 . 2 - m a y . , 2 0 1 3 a p w 8 8 2 4 w w w . a n p e c . c o m . t w 7 o p e r a t i n g w a v e f o r m s ( c o n t . ) r e f e r t o t h e 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 . t h e t e s t c o n d i t i o n i s v i n = 5 v , t a = 2 5 o c u n l e s s o t h e r w i s e s p e c i f i e d . ch 1 : v out , 1 v / div ch 2 : v lx , 5 v / div time : 20 m s / div sh ort c ircuit p rotection 1 3 2 ch 3 : i l , 2 a / div v out v lx i l
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 . 2 - m a y . , 2 0 1 3 a p w 8 8 2 4 w w w . a n p e c . c o m . t w 8 p i n d e s c r i p t i o n pin no. name f unction 1 e n enable control input. forcing this pin above 1.5v enables the device. forcing this pin below 0. 4 v shuts it down. in shutdown, all functions are disabled to decrease the supply current below 0.5 a. do not leave e n pin floating. 2 gnd power and signal ground. 3 lx switch node connected to inductor. this pin connects to the drains of the internal main and synchronous power mosfets switches. 4 vin device and converter supply pin . must be closely decoupled to gnd with a 10 f or g reater ceramic capacitor. 5 pg power good output. this pin is open - drain logic output that is pulled to ground when the output voltage is not within 10%of regulation point. 6 fb feedback inpu t pin . the b uck regulator senses feedback voltage via fb and re gulates the fb voltage at 0 .6 v. connecting fb with a resistor - divider from the output sets the output voltage of the b uck converter. b l o c k d i a g r a m oscillator logic control lx over - temperature protection v ref 0 . 6 v gm comp icmp soft - start error amplifier zero - crossing comparator current limit slope compensatio n vin current sense amplifier shutdown control ? fb e n gnd gate driver q 3 q 2 q 1 ovp uvp fb fb fb 120 % v ref 66 % v ref 90 % v ref 120 % v ref fb pg
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 . 2 - m a y . , 2 0 1 3 a p w 8 8 2 4 w w w . a n p e c . c o m . t w 9 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 s vin gnd 2 en 1 fb 6 apw 8824 lx 3 v in 2 . 7 ~ 5 . 5 v v out 0 . 6 v ~ v in 0 ~ 1 a l 1 2 . 2 m h r 2 4 r 1 c 3 ( option ) c 1 10 m f ( mlcc ) c 2 10 f ( mlcc ) i in r 1 < 1 . 5 m w is recommended r 2 < 2 00 k w is recommended c 1 closed to ic . less tan 2 mm is recommended pg r 3 100 k 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 . 2 - m a y . , 2 0 1 3 a p w 8 8 2 4 w w w . a n p e c . c o m . t w 1 0 f u n c t i o n d e s c r i p t i o n m a i n c o n t r o l l o o p t h e a p w 8 8 2 4 i s a c o n s t a n t f r e q u e n c y , s y n c h r o n o u s r e c - t i f i e r a n d c u r r e n t - m o d e s w i t c h i n g r e g u l a t o r . i n n o r m a l o p e r a t i o n , t h e i n t e r n a l p - c h a n n e l p o w e r m o s f e t i s t u r n e d o n e a c h c y c l e . t h e p e a k i n d u c t o r c u r r e n t w h i c h i c m p t u r n o f f t h e p - f e t i s c o n t r o l l e d b y t h e v o l t a g e o n t h e c o m p n o d e , w h i c h i s t h e o u t p u t o f t h e e r r o r a m p l i f i e r ( e a m p ) . a n e x t e r n a l r e s i s t i v e d i v i d e r c o n n e c t e d b e t w e e n v o u t a n d g r o u n d a l l o w s t h e e a m p t o r e c e i v e a n o u t p u t f e e d b a c k v o l t a g e v f b a t f b p i n . w h e n t h e l o a d c u r r e n t i n c r e a s e s , i t c a u s e s a s l i g h t l y d e c r e a s e i n v f b r e l a t i v e t o t h e 0 . 6 v r e f e r e n c e , w h i c h i n t u r n c a u s e s t h e c o m p v o l t a g e t o i n - c r e a s e u n t i l t h e a v e r a g e i n d u c t o r c u r r e n t m a t c h e s t h e n e w l o a d c u r r e n t . u n d e r - v o l t a g e l o c k o u t a n u n d e r - v o l t a g e l o c k o u t f u n c t i o n p r e v e n t s t h e d e v i c e f r o m o p e r a t i n g i f t h e i n p u t v o l t a g e o n v i n i s l o w e r t h a n a p p r o x i - m a t e l y 2 . 3 5 v . t h e d e v i c e a u t o m a t i c a l l y e n t e r s t h e s h u t - d o w n m o d e i f t h e v o l t a g e o n v i n d r o p s b e l o w a p p r o x i - m a t e l y 2 . 3 5 v . t h i s u n d e r - v o l t a g e l o c k o u t f u n c t i o n i s i m p l e - m e n t e d i n o r d e r t o p r e v e n t t h e m a l f u n c t i o n i n g o f t h e c o n v e r t e r . s o f t - s t a r t t h e a p w 8 8 2 4 h a s a b u i l t - i n s o f t - s t a r t t o c o n t r o l t h e o u t p u t v o l t a g e r i s 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 r a m p v o l t a g e , c o n n e c t e d t o t h e 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 a i s e s u p 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 . 6 v t y p i c a l ) u n t i l t h e r a m p v o l t a g e 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 . t h e n t h e v o l t a g e o n f b r e g u l a t e d a t r e f e r e n c e v o l t a g e . e n a b l e / s h u t d o w n d r i v i n g e n t o g r o u n d p l a c e s t h e a p w 8 8 2 4 i n s h u t d o w n m o d e . w h e n i n s h u t d o w n , t h e i n t e r n a l p o w e r m o s f e t s t u r n o f f , a l l i n t e r n a l c i r c u i t r y s h u t s d o w n a n d t h e q u i e s c e n t s u p p l y c u r r e n t r e d u c e s t o 0 . 5 m a m a x i m u m . p u l s e f r e q u e n c y m o d u l a t i o n m o d e ( p f m ) the apw8824 is a fixed frequency pwm peak current mode control step-down converter. at light loads, the apw8824 will automatically enter in pulse frequency mode operation to reduce the dominant switching losses. in pfm operation, the inductor current may reach zero or reverse on each pulse. a zero current comparator turn off the n-fet, forcing dcm operation at light load. these controls get very low quiescent current, help to maintain high efficiency over the complete load range. s l o p e c o m p e n s a t i o n a n d i n d u c t o r p e a k c u r r e n t s l o p e c o m p e n s a t i o n p r o v i d e s s t a b i l i t y i n c o n s t a n t f r e - q u e n c y a r c h i t e c t u r e s b y p r e v e n t i n g s u b - h a r m o n i c o s c i l - l a t i o n s a t h i g h d u t y c y c l e s . i t i s a c c o m p l i s h e d i n t e r n a l l y b y a d d i n g a c o m p e n s a t i n g r a m p t o t h e i n d u c t o r c u r r e n t s i g - n a l a t d u t y c y c l e s i n e x c e s s o f 4 0 % . n o r m a l l y , t h i s r e s u l t s i n a r e d u c t i o n o f m a x i m u m i n d u c t o r p e a k c u r r e n t f o r d u t y c y c l e s > 4 0 % . h o w e v e r , t h e a p w 8 8 2 4 u s e s a s p e c i a l s c h e m e t h a t c o u n t e r a c t s t h i s c o m p e n s a t i n g r a m p , w h i c h a l l o w s t h e m a x i m u m i n d u c t o r p e a k c u r r e n t t o r e m a i n u n a f f e c t e d t h r o u g h o u t a l l d u t y c y c l e s . d r o p o u t o p e r a t i o n a s t h e i n p u t s u p p l y v o l t a g e d e c r e a s e s t o a v a l u e a p p r o a c h - i n g t h e o u t p u t v o l t a g e , t h e d u t y c y c l e i n c r e a s e s t o w a r d t h e m a x i m u m o n t i m e . f u r t h e r r e d u c t i o n o f t h e s u p p l y v o l t - a g e f o r c e s t h e m a i n s w i t c h t o r e m a i n o n f o r m o r e t h a n o n e c y c l e u n t i l i t r e a c h e s 1 0 0 % d u t y c y c l e . t h e o u t p u t v o l t a g e w i l l b e d e t e r m i n e d b y t h e i n p u t v o l t a g e m i n u s t h e v o l t a g e d r o p a c r o s s t h e p - f e t a n d t h e i n d u c t o r . a n i m p o r t a n t d e t a i l t o r e m e m b e r i s t h a t o n r e s i s t a n c e o f p - f e t s w i t c h w i l l i n c r e a s e a t l o w i n p u t s u p p l y v o l t a g e . t h e r e f o r e , t h e u s e r s h o u l d c a l c u l a t e t h e p o w e r d i s s i p a - t i o n w h e n t h e a p w 8 8 2 4 i s u s e d a t 1 0 0 % d u t y c y c l e w i t h l o w i n p u t v o l t a g e .
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 . 2 - m a y . , 2 0 1 3 a p w 8 8 2 4 w w w . a n p e c . c o m . t w 1 1 f u n c t i o n d e s c r i p 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 ( 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 8 8 2 4 . 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 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 . i t i s a l a t c h p r o t e c t i o n . o v e r v o l t a g e p r o t e c t i o n 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 s o v e r 1 2 0 % 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 t u r n o n l o w s i d e n - m o s f e t a n d s h u t d o w n t h e c o n - v e r t e r o u t p u 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 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 u n d e r - v o l t a g e t h r e s h o l d i s 6 6 % 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 1 5 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 b e i n g c a u s e d b y n o i s e . a p w 8 8 2 4 w i l l b e l a t c h e d a f t e r u n d e r - v o l t a g e p r o t e c t i o n . p o w e r g o o d p g i s a c t i v e l y h e l d l o w i n s h u t d o w n a n d s o f t - s t a r t s t a t u s . i n t h e s o f t - s t a r t p r o c e s s , t h e p g i s a n o p e n - d r a i n . w h e n t h e s o f t - s t a r t i s f i n i s h e d , t h e p g i s r e l e a s e d . i n n o r m a l o p e r a t i o n , t h e p g w i n d o w i s f r o m 9 0 % t o 1 2 0 % o f t h e c o n v e r t e r r e f e r e n c e v o l t a g e . w h e n t h e o u t p u t v o l t a g e h a s t o s t a y w i t h i n t h i s w i n d o w , p g s i g n a l w i l l b e c o m e h i g h . w h e n t h e o u t p u t v o l t a g e o u t r u n s 9 0 % o r 1 2 0 % o f t h e t a r g e t v o l t a g e , p g s i g n a l w i l l b e p u l l e d l o w i m m e d i a t e l y .
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 . 2 - m a y . , 2 0 1 3 a p w 8 8 2 4 w w w . a n p e c . c o m . t w 1 2 a p p l i c a t i o n i n f o r m a t i o n i n p u t c a p a c i t o r s e l e c t i o n t o a v o i d s a t u r a t i o n o f t h e i n d u c t o r , t h e i n d u c t o r s h o u l d b e r a t e d a t l e a s t f o r t h e m a x i m u m o u t p u t c u r r e n t o f t h e c o n - v e r t e r p l u s t h e i n d u c t o r r i p p l e c u r r e n t . i l ( m a x ) = i o u t ( m a x ) + 1 / 2 x d i l o u t p u t c a p a c i t o r s e l e c t i o n w h e n c h o o s i n g t h e i n p u t a n d o u t p u t c e r a m i c c a p a c i t o r s , c h o o s e t h e x 5 r o r x 7 r d i e l e c t r i c f o r m u l a t i o n s . t h e s e d i e l e c t r i c s h a v e t h e b e s t t e m p e r a t u r e a n d v o l t a g e c h a r - a c t e r i s t i c s o f a l l t h e c e r a m i c s f o r a g i v e n v a l u e a n d s i z e . l sw in out out i f v v 1 v l d ? ? ? ? ? - 3 b e c a u s e b u c k c o n v e r t e r s h a v e a p u l s a t i n g i n p u t c u r r e n t , a l o w e s r i n p u t c a p a c i t o r i s r e q u i r e d . t h i s r e s u l t s i n t h e b e s t i n p u t v o l t a g e f i l t e r i n g , m i n i m i z i n g t h e i n t e r f e r e n c e w i t h o t h e r c i r c u i t s c a u s e d b y h i g h i n p u t v o l t a g e s p i k e s . a l s o , t h e i n p u t c a p a c i t o r m u s t b e s u f f i c i e n t l y l a r g e t o s t a - b i l i z e t h e i n p u t v o l t a g e d u r i n g h e a v y l o a d t r a n s i e n t s . f o r g o o d i n p u t v o l t a g e f i l t e r i n g , u s u a l l y a 1 0 m f i n p u t c a p a c i t o r i s s u f f i c i e n t . i t c a n b e i n c r e a s e d w i t h o u t a n y l i m i t f o r b e t t e r i n p u t - v o l t a g e f i l t e r i n g . c e r a m i c c a p a c i t o r s s h o w b e t t e r p e r f o r m a n c e b e c a u s e o f t h e l o w e s r v a l u e , a n d t h e y a r e l e s s s e n s i t i v e a g a i n s t v o l t a g e t r a n s i e n t s a n d s p i k e s c o m - p a r e d t o t a n t a l u m c a p a c i t o r s . p l a c e t h e i n p u t c a p a c i t o r a s c l o s e a s p o s s i b l e t o t h e i n p u t a n d g n d p i n o f t h e d e v i c e f o r b e t t e r p e r f o r m a n c e . t h e c u r r e n t - m o d e c o n t r o l s c h e m e o f t h e a p w 8 8 2 4 a l - l o w s t h e u s e o f t i n y c e r a m i c c a p a c i t o r s . t h e h i g h e r c a - p a c i t o r v a l u e p r o v i d e s t h e g o o d l o a d t r a n s i e n t s r e s p o n s e . c e r a m i c c a p a c i t o r s w i t h l o w e s r v a l u e s h a v e t h e l o w e s t o u t p u t v o l t a g e r i p p l e a n d a r e r e c o m m e n d e d . i f r e q u i r e d , t a n t a l u m c a p a c i t o r s m a y b e u s e d a s w e l l . 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 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 . i n d u c t o r s e l e c t i o n f o r h i g h e f f i c i e n c i e s , t h e i n d u c t o r s h o u l d h a v e a l o w d c r e s i s t a n c e t o m i n i m i z e c o n d u c t i o n l o s s e s . e s p e c i a l l y a t h i g h - s w i t c h i n g f r e q u e n c i e s t h e c o r e m a t e r i a l h a s a h i g h e r i m p a c t o n e f f i c i e n c y . w h e n u s i n g s m a l l c h i p i n d u c t o r s , t h e e f f i c i e n c y i s r e d u c e d m a i n l y d u e t o h i g h e r i n d u c t o r c o r e l o s s e s . t h i s n e e d s t o b e c o n s i d e r e d w h e n s e l e c t - i n g t h e a p p r o p r i a t e i n d u c t o r . t h e i n d u c t o r v a l u e d e t e r - m i n e s t h e i n d u c t o r r i p p l e c u r r e n t . t h e l a r g e r t h e i n d u c t o r v a l u e , t h e s m a l l e r t h e i n d u c t o r r i p p l e c u r r e n t a n d t h e l o w e r t h e c o n d u c t i o n l o s s e s o f t h e c o n v e r t e r . c o n v e r s e l y , l a r g e r i n d u c t o r v a l u e s c a u s e a s l o w e r l o a d t r a n s i e n t r e s p o n s e . 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 , d i l , i s 4 0 % o f m a x i m u m o u t p u t c u r r e n t . t h e r e c o m m e n d e d i n d u c t o r v a l u e c a n b e c a l c u l a t e d a s b e l o w : o u t p u t v o l t a g e s e t t i n g t h e o u t p u t v o l t a g e i s s e t b y a r e s i s t i v e d i v i d e r . t h e e x t e r - n a l r e s i s t i v e d i v i d e r i s c o n n e c t e d t o t h e o u t p u t , a l l o w i n g r e m o t e v o l t a g e s e n s i n g a s s h o w n i n ? 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 s ? . a s u g g e s t i o n o f m a x i m u m v a l u e o f r 2 i s 2 0 0 k w t o k e e p t h e m i n i m u m c u r r e n t t h a t p r o v i d e s e n o u g h n o i s e r e j e c t i o n a b i l i t y t h r o u g h t h e r e s i s t o r d i v i d e r . t h e o u t p u t v o l t a g e c a n b e c a l c u l a t e d a s b e l o w : ? ? ? ? ? + = ? ? ? ? ? + = 2 r 1 r 1 6 . 0 2 r 1 r 1 v v ref out r 2 2 00 k w apw 882 4 fb gnd v out r 1 1 . 5 m w ? ? ? ? ? + ? ? ? ? ? - @ d out sw sw in out out out c f 8 1 esr l f v v 1 v 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 . 2 - m a y . , 2 0 1 3 a p w 8 8 2 4 w w w . a n p e c . c o m . t w 1 3 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 . ) t h e r m a l c o n s i d e r a t i o n s i n m o s t a p p l i c a t i o n s t h e a p w 8 8 2 4 d o e s n o t d i s s i p a t e m u c h h e a t d u e t o i t s h i g h e f f i c i e n c y . b u t , i n a p p l i c a t i o n s w h e r e t h e a p w 8 8 2 4 i s r u n n i n g a t h i g h a m b i e n t t e m p e r a - t u r e w i t h l o w s u p p l y v o l t a g e a n d h i g h d u t y c y c l e s , t h e h e a t d i s s i p a t e d m a y e x c e e d t h e m a x i m u m j u n c t i o n t e m p e r a - t u r e o f t h e p a r t . i f t h e j u n c t i o n t e m p e r a t u r e r e a c h e s a p - p r o x i m a t e l y 1 5 0 o c , b o t h p o w e r s w i t c h e s w i l l b e t u r n e d o f f a n d t h e l x n o d e w i l l b e c o m e h i g h i m p e d a n c e . t o a v o i d t h e a p w 8 8 2 4 f r o m e x c e e d i n g t h e m a x i m u m j u n c - t i o n t e m p e r a t u r e , t h e u s e r w i l l n e e d t o d o s o m e t h e r m a l a n a l y s i s . t h e g o a l o f t h e t h e r m a l a n a l y s i s i s t o d e t e r m i n e w h e t h e r t h e p o w e r d i s s i p a t e d e x c e e d s t h e m a x i m u m j u n c t i o n t e m p e r a t u r e o f t h e p a r t . t h e p o w e r d i s s i p a t e d b y t h e p a r t i s a p p r o x i m a t e d : d)) - (1 r d (r i p fet - n fet - p 2 out d + @ t h e t e m p e r a t u r e r i s e i s g i v e n b y : t r = ( p d ) ( q j a ) w h e r e p d i s t h e p o w e r d i s s i p a t e d b y t h e r e g u l a t o r , d i s d u t y c y c l e o f m a i n s w i t c h d = v o u t / v i n t h e q j a i s t h e t h e r m a l r e s i s t a n c e f r o m t h e j u n c t i o n o f t h e d i e t o t h e a m b i e n t t e m p e r a t u r e . t h e j u n c t i o n t e m p e r a t u r e , t j , i s g i v e n b y : t j = t a + t r w h e r e t a i s t h e a m b i e n t t e m p e r a t u r e . t h e m a x i m u m p o w e r d i s s i p a t i o n o n t h e d e v i c e c a n b e s h o w n a s f o l l o w f i g u r e : junction temperature ( o c ) m a x i m u m p o w e r d i s s p a t i o n ( w ) - 50 - 25 0 25 50 75 100 125 150 0 0 . 1 0 . 2 0 . 3 0 . 4 0 . 5 0 . 6 0 . 7 0 . 8 v in v out i l n - fet lx i out c in c out i in i lim i l i peak i out i p - fet d i l esr p - fet i p - fet
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 . 2 - m a y . , 2 0 1 3 a p w 8 8 2 4 w w w . a n p e c . c o m . t w 1 4 l a y o u t c o n s i d e r a t i o n s for all switching power supplies, the layout is an impor- tant step in the design; especially at high peak currents and switching frequencies. if the layout is not carefully done, the regulator might show noise problems and duty cycle jitter. 1. the input capacitor should be placed close to the vin and gnd. connecting the capacitor and vin/gnd with short and wide trace without any via holes for good input voltage filtering. the distance between vin/gnd to ca- pacitor less than 2mm respectively is recommended. 2. to minimize copper trace connections that can inject noise into the system, the inductor should be placed as close as possible to the lx pin to minimize the noise coupling into other circuits. 3. the output capacitor should be place closed to vout and gnd. 4. since the feedback pin and network is a high imped- ance circuit the feedback network should be routed away from the inductor. the feedback pin and feedback net- work should be shielded with a ground plane or trace to minimize noise coupling into this circuit. 5. a star ground connection or ground plane minimizes ground shifts and noise is recommended. 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 . )
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 . 2 - m a y . , 2 0 1 3 a p w 8 8 2 4 w w w . a n p e c . c o m . t w 1 5 p a c k a g e i n f o r m a t i o n t s o t - 2 3 - 6 a c see view a d e e 1 b e 1 e a a 2 a 1 view a l 0 . 2 5 seating plane gauge plane note : 1 . followed from jedec to - 178 ab . 2 . dimension d and e 1 do not include mold flash , protrusions or gate burrs . mold flash , protrusion or gate burrs shall not exceed 10 mil per side . 0 . 020 0 . 008 0 . 004 0 . 024 0 . 035 0 . 039 max . 0 . 30 l 0 0 o e e e 1 e 1 d c b 0 . 08 0 . 30 0 . 012 0 . 60 8 o 0 o 8 o 0 . 95 bsc 1 . 90 bsc 0 . 50 0 . 20 0 . 075 bsc 0 . 037 bsc 0 . 012 0 . 003 millimeters min . s y m b o l a 1 a 2 a 0 . 01 0 . 70 tsot - 23 - 6 a max . 0 . 90 0 . 10 1 . 00 min . 0 . 000 0 . 028 inches 2 . 70 3 . 10 0 . 106 0 . 122 2 . 60 3 . 00 0 . 102 0 . 118 1 . 40 1 . 80 0 . 055 0 . 071 0 . 70 0 . 028
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 . 2 - m a y . , 2 0 1 3 a p w 8 8 2 4 w w w . a n p e c . c o m . t w 1 6 application a h t1 c d d w e1 f 178.0 ? 2.00 50 min. 8.4+2.00 - 0.00 13.0+0.50 - 0.20 1.5 min. 20.2 min. 8.0 ? 0.30 1.75 ? 0.10 3.5 ? 0.05 p 0 p1 p 2 d 0 d1 t a 0 b 0 k 0 tsot - 23 - 6a 4.0 ? 0.10 4.0 ? 0.10 2.0 ? 0.05 1.5+0.10 - 0.00 1.0 min. 0.6+0.00 - 0 .40 3.20 ? 0.20 3.10 ? 0.20 1.20 ? 0.20 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 d e v i c e s p e r u n i t ( m m ) package type unit quantity t sot - 23 - 6 a tape & reel 3000 h t1 a d a e 1 a b w f t p0 od0 b a0 p2 k0 b 0 section b-b section a-a od1 p1
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 . 2 - m a y . , 2 0 1 3 a p w 8 8 2 4 w w w . a n p e c . c o m . t w 1 7 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 t s o t - 2 3 - 6 a c l a s s i f i c a t i o n p r o f i l e user direction of feed aaax aaax aaax aaax aaax aaax aaax
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 . 2 - m a y . , 2 0 1 3 a p w 8 8 2 4 w w w . a n p e c . c o m . t w 1 8 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 preheat & soak temperature min (t smin ) temperature max (t smax ) time (t smin to t smax ) ( t s ) 100 c 150 c 60 - 120 seconds 150 c 200 c 60 - 1 2 0 seconds average ramp - up rate (t smax to t p ) 3 c/second ma x. 3 c/second max. liquidous temperature ( t l ) time at l iquidous (t l ) 183 c 60 - 150 seconds 217 c 60 - 150 seconds peak package body temperature (t p ) * see classification temp in table 1 see classification temp in table 2 time (t p ) ** within 5 c of the spec ified c lassification t emperature ( t c ) 2 0 ** seconds 3 0 ** seconds average r amp - down rate (t p to t smax ) 6 c/second max. 6 c/second max. time 25 c to p eak t emperature 6 minutes max. 8 minutes max. * tolerance for peak profile temperature (t p ) is defined a s a supplier minimum and a user maximum. ** tolerance for time at peak profile temperature (t p ) is defined as a supplier minimum and a user maximum. table 2. pb - free process ? classification temperatures (tc) package thickness volume mm 3 <350 volume mm 3 350 - 2000 volume mm 3 >2000 <1.6 mm 260 c 260 c 260 c 1.6 mm ? 2.5 mm 260 c 250 c 245 c 3 2.5 mm 250 c 245 c 245 c table 1. snpb eutectic process ? classification temperatures (tc) package thickness volume mm 3 <350 volume mm 3 3 350 <2.5 mm 235 c 22 0 c 3 2.5 mm 220 c 220 c test item method description solderability jesd - 22, b102 5 sec, 245 c holt jesd - 22, a108 1000 hrs, bias @ tj=125 c pct jesd - 22, a102 168 hrs, 100 % rh, 2atm , 121 c tct jesd - 22, a104 500 cycles, - 65 c~150 c hbm mil - std - 883 - 3015.7 vhbm ? 2kv mm jesd - 22, a1 15 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
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 . 2 - m a y . , 2 0 1 3 a p w 8 8 2 4 w w w . a n p e c . c o m . t w 1 9 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, r.o.c. 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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