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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 - j u n . , 2 0 1 1 a p l 3 2 0 5 a / b 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 . l i + c h a r g e r p r o t e c t i o n i c i n p u t o v e r - v o l t a g e p r o t e c t i o n p r o g r a m m a b l e i n p u t o v e r - c u r r e n t p r o t e c t i o n b a t t e r y o v 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 h i g h i m m u n i t y o f f a l s e t r i g g e r i n g h i g h a c c u r a c y p r o t e c t i o n t h r e s h o l d s f a u l t s t a t u s i n d i c a t i o n e n a b l e i n p u t a v a i l a b l e i n t d f n 2 x 2 - 8 p a c k a g e lead free and green devices available (rohs compliant) t h e a p l 3 2 0 5 a / b p r o v i d e c o m p l e t e d l i + c h a r g e r p r o t e c - t i o n s a g a i n s t o v e r - v o l t a g e , o v e r - c u r r e n t , a n d b a t t e r y o v e r - v o l t a g e . t h e i c i s d e s i g n e d t o m o n i t o r i n p u t v o l t a g e , i n - p u t c u r r e n t , a n d b a t t e r y v o l t a g e . w h e n a n y o f t h e m o n i - t o r e d p a r a m e t e r s a r e o v e r t h e t h r e s h o l d , t h e i c r e m o v e s t h e p o w e r f r o m t h e c h a r g i n g s y s t e m b y t u r n i n g o f f a n i n - t e r n a l s w i t c h . a l l p r o t e c t i o n s a l s o h a v e d e g l i t c h t i m e a g a i n s t f a l s e t r i g g e r i n g d u e t o v o l t a g e s p i k e s o r c u r r e n t t r a n s i e n t s . t h e a p l 3 2 0 5 a / b a l s o p r o v i d e 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 , a f a u l t o u t p u t p i n t o i n d i c a t e t h e f a u l t c o n d i t i o n s , a n d t h e e n p i n t o a l l o w t h e s y s t e m t o d i s a b l e t h e i c . 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 a p p l i c a t i o n s s m a r t p h o n e s a n d p d a s d i g i t a l s t i l l c a m e r a s p o r t a b l e d e v i c e s p i n c o n f i g u r a t i o n 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 in ilim out bat gnd APL3205A/b li+ battery en fault psw charger output and system charger input 5v adapter or usb psw 3 8 out in 1 gnd 2 fault 4 7 ilim 5 en 6 bat tdfn2x2-8 (top view)
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 - j u n . , 2 0 1 1 w w w . a n p e c . c o m . t w 2 a p l 3 2 0 5 a / b 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 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 ) . 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 in input voltage (in pin to gnd) - 0.3 to 30 v v out , v bat out, bat pins to gnd voltage - 0.3 to 7 v v ilim , v fault , v en , v psw ilim, fault, en, psw, pins to gnd voltage - 0.3 to 7 v i out out output current 2 a t j ma ximum junction temperature 150 o c t stg storage temperature range - 65 to 150 o c t sdr maximum lead soldering temperature , 10 seconds 260 o c n o t e 1 : s t r e s s e s b e y o n d t h e a b s o l u t e m a x i m u m r a t i n g m a y d a m a g e t h e d e v i c e a n 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 . t h e r m a l c h a r a c t e r i s t i c s symbol parameter typical value unit q ja junction to ambient t hermal r esistance in free air tdfn2x2 - 8 80 c/w 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 symbol parameter range unit v in in input voltage 4.5 to 5.5 v i out out output current 0 to 1.5 a t j junction temperature - 40 to 125 c t a ambient temperature - 40 to 85 c APL3205A package code qb : tdfn2x2-8 operating ambient temperature range i : -40 to 85 o c handling code tr : tape & reel assembly material g : halogen and lead free device handling code temperature range package code APL3205A qb: x - date code assembly material l05a x apl3205b apl3205b qb: x - date code l05b x
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 - j u n . , 2 0 1 1 w w w . a n p e c . c o m . t w 3 a p l 3 2 0 5 a / b APL3205A/b symbol parameter test conditions min. typ. max. unit power - on - reset (por) and supply current v por in por threshold v in rising 2.5 - 2.8 v v por_hys in por hysteresis - 230 - mv en = low - 250 350 i cc in supply current en = hig h - 100 150 m a t b(in) input power - on blanking time v in rising to v out rising - 8 - ms internal power switch and out discharge resistance power switch on resistance i out = 0.5a - 250 450 m w out discharge resistance v out = 3v - 500 - w input over - voltag e protection (ovp) APL3205A, v in rising 5.67 5.85 6.00 v ovp input ovp threshold apl3205b, v in rising 6.60 6.80 7.00 v input ovp recovery hysteresis - 200 - mv input ovp propagation delay - - 1 m s t on(ovp) input ovp recovery time - 8 - ms over - current protection (ocp) i ocp ocp threshold r ilim = 25k w 930 1000 1200 ma ocp threshold accuracy i ocp = 300ma to 1500ma - 10 - +10 % t b(ocp) ocp blanking time - 176 - m s t on(ocp) ocp recovery time - 64 - ms battery over - voltage protection v bovp battery ovp threshold v bat rising 4.30 4.35 4.4 v battery ovp hysteresis - 270 - mv i bat bat pin leakage current v bat = 4.4v - - 20 na t b(bovp) battery ovp blanking time - 176 - m s en logic levels en input logic high 1.4 - - v en input logi c low - - 0.4 v en internal pull - low resistor - 500 - k w fault logic levels and delay time fault output low voltage sink 5ma current - - 0.4 v fault pin leakage current v fault = 5v - - 1 m a over - temperature protection (otp) t otp over - tempera ture threshold - 140 - c over - temperature hysteresis - 20 - c psw logic levels psw output low threshold v in rising, v out - v bat 50 100 150 mv psw output high threshold v in falling, v out - v bat 20 50 80 mv refer to the typical application circuit. these specifications apply over v in =5v, t a = -40~85 c , unless otherwise specified. typical values are at t a =25 c. 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 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 - j u n . , 2 0 1 1 w w w . a n p e c . c o m . t w 4 a p l 3 2 0 5 a / b APL3205A/b symbol parameter test conditions min. typ. max. unit psw logic levels (cont.) psw source current v psw = 2.5v - 2.5 - ma psw sink current v psw = 2.5v - 5 - ma t d(psw) psw low delay time v in rising, v out - v bat - 1 - ms refer to the typical application circuit. these specifications apply over v in =5v, t a = -40~85 c , unless otherwise specified. typical values are at t a =25 c. 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 . )
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 - j u n . , 2 0 1 1 w w w . a n p e c . c o m . t w 5 a p l 3 2 0 5 a / b 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 c p t h r e s h o l d , i o c p ( m a ) junction temperature ( o c) ocp threshold vs. junction temperature -50 -25 0 25 50 75 100 125 800 850 900 950 1000 1050 1100 1150 1200 in supply current vs. junction temperature i n s u p p l y c u r r e n t , i c c ( m a ) junction temperature ( o c) en = high 50 75 100 125 150 -50 -25 0 25 50 75 100 125 p o r t h r e s h o l d , v p o r ( v ) por threshold vs. junction temperature junction temperature ( o c) -50 -25 0 25 50 75 100 125 2.20 2.30 2.40 2.50 2.60 2.70 2.80 v in increasing v in decreasing i n p u t o v p t h r e s h o l d , v o v p ( v ) junction temperature ( o c) input ovp threshold vs. junction temperature -50 -25 0 25 50 75 100 125 v in increasing v in decreasing 6.50 6.55 6.60 6.65 6.70 6.75 6.80 6.85 6.90 6.95 7.00 apl3205b battery ovp threshold vs. junction temperature b a t t e r y o v p t h r e s h o l d , v b o v p ( v ) junction temperature ( o c) -50 -25 0 25 50 75 100 125 4.00 4.05 4.10 4.15 4.20 4.25 4.30 4.35 4.40 v bat increasing v bat decreasing i n p u t o v p t h r e s h o l d , v o v p ( v ) junction temperature ( o c) input ovp threshold vs. junction temperature -50 -25 0 25 50 75 100 125 5.55 5.60 5.65 5.70 5.75 5.80 5.85 5.90 5.95 6.00 v in increasing v in decreasing APL3205A
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 - j u n . , 2 0 1 1 w w w . a n p e c . c o m . t w 6 a p l 3 2 0 5 a / b 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 . ) p o w e r s w i t c h o n r e s i s t a n c e , r d s , o n ( w ) input voltage, v in (v) power switch on resistance vs. input voltage 0.10 0.15 0.20 0.25 0.30 0.35 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 power switch on resistance vs. junction temperature 150 200 250 300 350 400 junction temperature ( o c) -50 -25 0 25 50 75 100 125 p o w e r s w i t c h o n r e s i s t a n c e , r d s , o n ( m w )
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 - j u n . , 2 0 1 1 w w w . a n p e c . c o m . t w 7 a p l 3 2 0 5 a / b 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 . normal power on 1 2 3 v in v out ch1: v in , 5v/div, dc ch2: v out , 2v/div, dc time: 2m s/div c out =1 m f, c in =1 m f, r out = 10 w ch3: i out , 0.5a/div, dc i out v in = 0 to 5v ovp at power on 1 2 3 v in v out ch1: v in , 10v/div, dc ch2: v out , 2v/div, dc c out =1 m f, c in =1 m f, r out = 10 w ch3: v fault , 5v/div, dc time: 2ms/div v fault v in = 0 to 12v i n p u t o v e r - v o l t a g e p r o t e c t i o n v out v in 1 3 v fault 2 apl3205b ch1: v in , 5v/div, ac ch2: v out , 2v/div, dc time:20 m s/div c out = 1 m f, c in =1 m f, r out =50 w ch3: v fault , 5v/div, dc i n p u t o v e r - v o l t a g e p r o t e c t i o n ch1: v in , 5v/div, ac ch2: v out , 2v/div, dc time:20 m s/div c out = 1 m f, c in =1 m f, r out =50 w ch3: v fault , 5v/div, dc v out v in 1 3 v fault 2 APL3205A
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 - j u n . , 2 0 1 1 w w w . a n p e c . c o m . t w 8 a p l 3 2 0 5 a / b 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 . recovery from input ovp v out v in v fault 1 3 2 ch1: v in , 5v/div, ac ch2: v out , 5v/div, dc time: 2 m s/div c out = 1 m f, c in =1 m f, r out =50 w v in = 12v to 5v ch3: v fault , 5v/div, dc apl3 2 04b recovery from battery ovp 3 1 2 ch1: v bat , 2v/div, dc ch2: v out , 2v/div, dc time: 50 m s/div v bat = 4.4v to 3.6v, r out =33.3 w c out =1 m f, c in =1 m f ch3: v fault , 5v/div, dc v bat v out v fault a p l 3 2 0 5 b ch1: v bat , 2v/div, dc ch2: v out , 2v/div, dc time: 5 m s/div v bat = 3.6v to 4.4v to 3.6v, r out =33.3 w ch3: v fault , 5v/div, dc c out =1 m f, c in =1 m f b a t t e r y o v e r - v o l t a g e p r o t e c t i o n 1 3 2 v bat v out v fault b a t t e r y o v e r - v o l t a g e p r o t e c t i o n v bat 1 2 3 v out v fault ch1: v bat , 2v/div, dc ch2: v out , 2v/div, dc time: 50 m s/div v bat = 3.6v to 4.4v, r out =33.3 w c out =1 m f, c in =1 m f ch3: v fault , 5v/div, dc
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 - j u n . , 2 0 1 1 w w w . a n p e c . c o m . t w 9 a p l 3 2 0 5 a / b 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 . ch1: v bat , 1v/div, dc ch2: v out , 1v/div, dc time: 200 m s/div c out =1 m f, c in =1 m f ch3: v psw , 2v/div, dc psw output timing v in = 0v to 5v v bat = 3.8v v bat v out v psw 1,2,3 psw output timing v bat v out v psw 1,2,3 v in = 5v to 0v v bat = 3.8v ch1: v bat , 1v/div, dc ch2: v out , 1v/div, dc time: 5 m s/div c out =1 m f, c in =1 m f ch3: v psw , 2v/div, dc o v e r - c u r r e n t p r o t e c t i o n ch1: i out , 0.5a/div, dc ch2: v out , 2v/div, dc time: 50 m s/div c out =1 m f, c in =1 m f, i out = 0.5a to 1.2a ch3: v fault , 5v/div, dc i out v in v out v fault 1 4 2 3 i out 1 2 3 v out v fault ch1: v in , 5v/div, dc ch2: v out , 5v/div, dc time: 200m s/div c out =1 m f, c in =1 m f, r out = 2.5 w ch3: i out , 0.5a/div, dc ch4: v fault , 5v/div, dc o v e r - c u r r e n t p r o t e c t i o n
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 - j u n . , 2 0 1 1 w w w . a n p e c . c o m . t w 1 0 a p l 3 2 0 5 a / b pin no. name function 1 in power supply input. 2 gnd ground . 3 psw psw is an active high output that drives the external pmos (see application circuit). 4 fault fault indication pin. this pin goes low when input ovp, ocp, or battery ovp is de tected. 5 en enable input. pull this pin to high to disable the device and pull this pin to low to enable device. 6 bat battery ovp sense pin. connect to positive terminal of battery through a resistor. 7 ilim over - current protection setting pin. c onnect a resistor to the gnd to set the over - current threshold. 8 out output voltage pin. the output voltage follows the input voltage when no fault is detected. - ep exposed thermal pad. must be electrically connected to the gnd pin. p i n d e s c r i p t i o n b l o c k d i a g r a m gate driver and control logic por in bat ilim out otp charge pump fault en gnd 1v 0.5v 1.2v v out v bat +0.1v psw
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 - j u n . , 2 0 1 1 w w w . a n p e c . c o m . t w 1 1 a p l 3 2 0 5 a / b 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 in ilim out bat gnd APL3205A/b li+ battery en psw 1 m f mtk pmu 1uf 25k 200k fault 5v adapter/ usb 0.2 chrin gtdrv isens vbat figure 1. the typical protection circuit for charger systems. mcu 50k 50k 50k vio gpio 1 2 3 4 5 6 7 8 apm2805qa in ilim out bat gnd APL3205A/b li+ battery en psw 1 m f mtk pmu 1uf 25k 200k fault chrin gtdrv isens vbat 5v adapter/ usb figure 2. use the psw pin to drive an external p-channel mosfet t for charger systems. 50k 50k 50k mcu vio gpio 1 2 3 4 5 6 7 8 apm2103qa 0.2
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 - j u n . , 2 0 1 1 w w w . a n p e c . c o m . t w 1 2 a p l 3 2 0 5 a / b the output current is monitored by the internal ocp circuit. when the output current reaches the ocp threshold, the device limits the output current at ocp threshold level. if the ocp condition continues for a blanking time of t b(ocp) , the internal power fet is turned off. after the recovery time of t on(ocp) , the fet will be turned on again and the output current is monitored again. the APL3205A/b have a built-in counter. when the total count of ocp fault reaches 16, the fet is turned off permanently, requiring either a v in por or en re-enable again to restart. the ocp threshold is programmed by a resistor r ilim con- nected from ilim pin to the gnd. the ocp threshold is calculated by the following equation: the APL3205A/b provide an open-drain output to indi- cate that a fault has occurred. when any of input ovp, ocp, battery ovp, is detected, the fault goes low to indicate that a fault has occurred. since the fault pin is an open-drain output, connecting a resistor to a pull high voltage is necessary. enable/shutdown pulling the en pin voltage above 1.4v disables the de- vice and pulling en pin voltage below 0.4v enables the device. the en pin has an internal pull-down resistor and can be left floating. when the ic is latched off due to the total count of ocp or battery ovp reaches 16, disable and re-enable the device with the en pin can clear the counter. over-temperature protection when the junction temperature exceeds 140 o c, the inter- nal thermal sense circuit turns off the power fet and allows the device to cool down. when the device?s junc- tion temperature cools by 20 o c , the internal thermal sense circuit will enable the device, resulting in a pulsed output during continuous thermal protection. thermal protec- tion is designed to protect the ic in the event of over tem- perature conditions. for normal operation, the junction temperature cannot exceed t j =+125 o c. the APL3205A/b monitor the bat pin voltage for battery over-voltage protection. the battery ovp threshold is in- ternally set to 4.35v. when the bat pin voltage exceeds the battery ovp threshold for a blanking time of t b(bovp) , battery over-voltage-protection f u n c t i o n d e s c r i p t i o n power-up the APL3205A/b have a built-in power-on-reset circuit to keep the output shuting off until internal circuitry is oper- ating properly. the por circuit has hysteresis and a de- glitch feature, therefore, it will typically ignore undershoot transients on the input. when input voltage exceeds the por threshold and after 8ms blanking time, the output voltage starts a soft-start to reduce the inrush current. ilim ilim ocp r k i = over-current protection (ocp) i n p u t o v e r - v o l t a g e p r o t e c t i o n ( o v p ) the input voltage is monitored by the internal ovp circuit. when the input voltage rises above the input ovp threshold, the internal fet will be turned off within 1 m s to protect connected system on out pin. when the input voltage returns below the input ovp threshold minus the hysteresis, the fet is turned on again after 8ms recovery time. the input ovp circuit has a 200mv hysteresis and a recovery time of t on(ovp) to provide noise immunity against transient conditions. the internal power fet is turned off. when the bp voltage returns below the battery ovp threshold minus the hysteresis, the fet is turned on again. the APL3205A/b have a built-in counter. when the total count of battery ovp fault reaches 16, the fet is turned off permanently, requiring either a v in por or en re-enable again to restart. fault output where k ilim =25000a w psw output the APL3205A/b provide an active high output to drive the external p-channel mosfet. when v out > v bat + 100mv, the psw pin is pulled low, and turns on the external p- channel mosfet for battery charge. when v out < v bat + 50mv, the psw pin is pulled high, and turns off the exter- nal p-channel mosfet, which prevents the battery volt- age from supplying to out pin and in pin (see applica- tion circuit).
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 - j u n . , 2 0 1 1 w w w . a n p e c . c o m . t w 1 3 a p l 3 2 0 5 a / b f u n c t i o n d e s c r i p t i o n ( c o n t . ) figure3. ovp timing chart t b(in) v in v out t on(ovp) v ovp v por v fault powering an accessory device in some applications, such as usb on-the-go, users need to power an accessory device by using the portable device?s battery through the jack holes of ac adapter. the apl3205 provide reverse current flow path from out to in. if v out > v por + 0.7v, fet q1 is turned on, and the reverse current does not flow through the diode but through q1. q1 will then remain on as long as v out > v por -v por_hys + r ds_on *isupply. within this voltage range, the reverse current capability is the same as the forward capability, 1.5a. it should be noted that there is no overcurrent protection in this direction. apl 3205 charger battery accessory power supply to system enable disable jack accessory device portable device in out gate driver and logic control q 1 i supply v out
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 - j u n . , 2 0 1 1 w w w . a n p e c . c o m . t w 1 4 a p l 3 2 0 5 a / b f u n c t i o n d e s c r i p t i o n ( c o n t . ) figure 5. battery ovp timing chart t b(bovp) count 13 times v out v bat v fault v bovp v bovp v bovp total count 16 times ic is latched off t b(bovp) t b(bovp) figure 4. ocp timing chart i out v out v fault t b(ocp) t on(ocp) t b(ocp) count 13 times total count 16 times ic is latched off ocp threshold t b(ocp)
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 - j u n . , 2 0 1 1 w w w . a n p e c . c o m . t w 1 5 a p l 3 2 0 5 a / b a p p l i c a t i o n i n f o r m a t i o n r bat selection connect the bat pin to the positive terminal of battery through a resistor r bat for battery ovp function. the r bat limits the current flowing from bat to battery in case of bat pin is shortened to vin pin under a failure mode. the recommended value of r bat is 100k w . in the worse case of an ic failure, the current flowing from the bat pin to the battery is: (30v-3v)/ 100k w =270 m a where the 30v is the maximum in voltage and the 3v is the minimum battery voltage. the current is so small that can be absorbed by the charger system. the disadvantage with the large r bat is that the error of the battery ovp threshold will be increased. the addi- tional error is the voltage drop across the r bat because of the bat bias current. when r bat is 100k w, the worse- case additional error is 100k w x20na=2mv, which is ac- ceptable in most applications. r en selection since the io voltage is divided by r en and en internal pull low resistor for en voltage. it has to be ensured that the en voltage is above the en logic high voltage when the gpio output of the mcu is high. fault output since the fault pin is an open-drain output, connecting a resistor r up to a pull high voltage is necessary. it is also recommended that connect the fault to the mcu gpio through a resistor r fault . the r fault prevents damage to the mcu under a failure mode. the recommended value of the resistors should be between 10k w and 100k w . capacitor selection the input capacitor is for decoupling and prevents the input voltage from overshooting to dangerous levels. in the ac adapter hot plug-in applications or load current step-down transient, the input voltage has a transient spike due to the parasitic inductance of the input cable. a 25v, x5r, dielectric ceramic capacitor with a value be- tween 1 m f and 4.7 m f placed close to the in pin is recommended. the output capacitor is for output voltage decoupling, and also can be as the input capacitor of the charging circuit. at least, a 1 m f, 10v, x5r capacitor is recommended. for the same reason as the bat pin case, the en pin should be connected to the mcu gpio pin through a resistor. the value of the r en is dependent on the io voltage of the mcu. in some failure modes, a high voltage may be applied to the device. make sure that the clearance constraint of the pcb layout must satisfy the design rule for high voltage. the exposed pad of the tdfn2x2-8 performs the func- tion of channeling heat away. it is recommended that connect the exposed pad to a large copper ground plane on the backside of the circuit board through several ther- mal vias to improve heat dissipation. the input and output capacitors should be placed close to the ic. r ilim also should be placed close to the ic. the high current traces like input trace and output trace must be wide and short. layout consideration bat li+ battery en fault mcu r up r fault r en r bat vio figure 6. r up , r fault , r en and r bat gpio gpio
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 - j u n . , 2 0 1 1 w w w . a n p e c . c o m . t w 1 6 a p l 3 2 0 5 a / b p a c k a g e i n f o r m a t i o n t d f n 2 x 2 - 8 note : 1. follow from jedec mo-229 wccd-3. min. max. 0.80 0.00 0.18 0.30 1.00 1.60 0.05 0.60 a a1 b d d2 e e2 e l millimeters a3 0.20 ref tdfn2x2-8 0.30 0.45 1.00 0.008 ref min. max. inches 0.031 0.000 0.007 0.012 0.039 0.063 0.024 0.012 0.018 0.70 0.039 0.028 0.002 0.50 bsc 0.020 bsc s y m b o l 1.90 2.10 0.075 0.083 1.90 2.10 0.075 0.083 d e a b a1 a3 d2 e 2 l e pin 1 corner
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 - j u n . , 2 0 1 1 w w w . a n p e c . c o m . t w 1 7 a p l 3 2 0 5 a / b d e v i c e s p e r u n i t package type unit quantity tdfn2x2 - 8 tape & reel 3000 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 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 ? 0.20 1.75 ? 0.10 3.50 ? 0.05 p 0 p1 p 2 d 0 d1 t a 0 b 0 k 0 tdfn2x2 - 8 4.0 ? 0.10 4.0 ? 0.10 2.0 ? 0.05 1.5+0.10 - 0.00 1.5 min. 0.6+0.00 - 0 .4 3.35 min 3.35 min 1.30 ? 0.20 (mm) 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 . 3 - j u n . , 2 0 1 1 w w w . a n p e c . c o m . t w 1 8 a p l 3 2 0 5 a / b 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 d f n 2 x 2 - 8 user direction of feed c l a s s i f i c a t i o n p r o f i l 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 . 3 - j u n . , 2 0 1 1 w w w . a n p e c . c o m . t w 1 9 a p l 3 2 0 5 a / b 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. 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 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 r e l i a b i l i t y t e s t p r o g r a m test item method description solderability jesd - 22, b102 5 sec, 245 c holt jesd - 22, a108 1000 hrs, bias @ 125 c pct jesd - 22, a102 168 hrs, 100%rh, 2atm , 121 c tct jesd - 22, a104 500 cycles, - 65 c~150 c esd mil - std - 883 - 3015.7 vhbm ? 2kv, vmm ? 200v latch - u p jesd 78 10ms, 1 tr ? 100ma
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 - j u n . , 2 0 1 1 w w w . a n p e c . c o m . t w 2 0 a p l 3 2 0 5 a / b 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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