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key features applications available in space saving packages: n general description n n n n n n n n n n n n n n supply voltage range from 2.5 v to 5.5 v 16-ball 1.95mmx1.95mm csp package 16-pin qfn4x4 package 16-pin qfn4x4 package. 30 vpp output load voltage from a 2.5 v supply integrated boost converter generates 17.5v supply programmable softstart small boost converter inductor selectable gain of 18 db, 22 db, and 26 db selectable boost output voltage of 8v, 12v, and 17.5v low shutdown current: <1ua build in thermal , ocp ,ovp,short protection wireless or cellular handsets por t able dvd player personal digital assistants (pdas ) electronic dictionaries digital still cameras the PAM8902 is a mono, class-d audio amplifier with integrated boost convertor designed for piezo and ceramic speakers.the PAM8902 is capable of d r i v i n g a c e r a m i c / p i e z o s p e a k e r w i t h 30vpp(10.6vrms) from a 3.6v power supply.the PAM8902's boost converter operates at a fixed frequency of 1.5mhz , and provides a 17.5v supply with a minimum number of external components. PAM8902 features an integrated audio low pass filter that rejects high frequency noise thus improving audio fidelity. and three gai n modes of 18db, 22db and 26db easy for using.PAM8902 also provides thermal ,short, under and over voltage protection. t h e p a m 8 9 0 2 i s a v a i l a b l e i n a 1 6 - b a l l 1.95mmx1.95mm csp package and typical application circuit PAM8902 30-vpp mono class-d audio amplifier for piezo/ceramic speakers 1 , power analog microelectronics inc www.poweranalog.com 01/2012 rev1.4 out- out+ avdd 0.1 f vin gnd inp PAM8902 inn 0.1 f 1 f vcm pgnd2 battery l1 4.7 h c1 10 f c2 10 f sw pgnd1 pvcc comp ena gset vset 10 22uh vout 22nf 56k *option(refer to application information)
block diagram 2 , power analog microelectronics inc www.poweranalog.com PAM8902 30-vpp mono class-d audio amplifier for piezo/ceramic speakers + gm - - pwm + sw pwm logic and driver + - pgnd1 1.5mhz oscillator enable ramp generator ena comp cs vref vset gset + - pwm modulator protection function pll 375khz bias and vref out+ out- avdd vcm/ss level shift and h-bridge pvcc pgnd2 gain adjust inn inp agnd gain vout setting resistor divider feedback pvcc vcm vout 01/2012 rev1.4
3 , power analog microelectronics inc www.poweranalog.com PAM8902 30-vpp mono class-d audio amplifier for piezo/ceramic speakers pin configuration & marking information 16 ball csp top view marking bg yw bg: product code of PAM8902 y: year w: week out+ pgnd2 gset ena vout a1 a2 a3 b1 b2 b3 vset vcm c1 c2 c3 sw a4 b4 comp c4 out- pgnd1 pvcc agnd inp inn d1 d2 d3 avdd d4 qfn 4x4 16l top view y: year w: week x: internal code 01/2012 rev1.4 1 2 3 4 16 5 p8902 xxxyw 15 6 14 7 13 8 12 11 10 9 vset vout sw pgnd1 gset inn inp ena : pin 1 indicator
absolute maximum ratings these are stress ratings only and functional operation is not implied exposure to absolute maximum ratings for prolonged time periods may affect device reliability all voltages are with respect to ground . . . supply voltage ...........................................6.0v input voltage.............................-0.3v to v +0.3v storage temperature.....................-65c to 150 soldering temperature.................... . dd c maximum junction temperature..................150c 250c,10 sec recommended operating conditions supply voltage range........................ ambient temperature range............-40 to 85 junction temperature range......... 2.5v to 5.5v c c -40c to 125c thermal information 4 , power analog microelectronics inc www.poweranalog.com p a r a m e t e r s y m b o l p a c k a g e m a x i m u m u n i t c s p 9 0 t h e r m a l r e s i s t a n c e ( j u n c t i o n t o a m b i e n t ) j a q f n 4 x 4 - 1 6 5 2 c / w c s p 7 5 t h e r m a l r e s i s t a n c e ( j u n c t i o n t o c a s e ) j c q f n 4 x 4 - 1 6 3 0 c / w PAM8902 30-vpp mono class-d audio amplifier for piezo/ceramic speakers pin configuration b u m p ( c s p ) p i n n o . ( q f n ) n a m e d e s c r i p t i o n a 1 1 6 p v c c a u d i o a m p l i f i e r p o w e r s u p p l y a 2 1 v o u t b o o s t c o n v e r t o r o u t p u t a 3 2 s w b o o s t c o n v e r t o r s w i t c h i n g n o d e a 4 4 p g n d 1 b o o s t c o n v e r t o r p o w e r g r o u n d b 1 1 5 o u t + p o s i t i v e d i f f e r e n t i a l a u d i o o u t p u t b 2 3 v s e t b o o s t c o n v e r t o r o u t p u t v o l t a g e s e t t i n g ( 8 v , 1 2 v , 1 7 . 5 v ) b 3 5 c o m p b o o s t c o n v e r t o r c o m p e n s a t i o n b 4 6 a v d d p o w e r s u p p l y c 1 1 4 o u t - n e g a t i v e d i f f e r e n t i a l a u d i o o u t p u t c 2 1 1 g s e t a m p l i f i e r g a i n s e t t i n g ( 1 8 d b , 2 2 d b , 2 6 d b ) c 3 7 v c m c o m m o n m o d e b y p a s s c a p c 4 8 a g n d a n a l o g g r o u n d d 1 1 3 p g n d 2 c l a s s d p o w e r g r o u n d d 2 1 2 e n a w h o l e c h i p e n a b l e d 3 1 0 i n n n e g a t i v e d i f f e r e n t i a l a u d i o i n p u t d 4 9 i n p p o s i t i v e d i f f e r e n t i a l a u d i o i n p u t 01/2012 rev1.4
5 electrical characteristic t =25 c, a v =3.6v,c =1uf,vset float, unless otherwise noted dd l . , power analog microelectronics inc www.poweranalog.com PAM8902 30-vpp mono class-d audio amplifier for piezo/ceramic speakers 01/2012 rev1.4 p a r a m e t e r s y m b o l t e s t c o n d i t i o n m i n t y p m a x u n i t i n p u t v o l t a g e v d d 2 . 5 5 . 5 v e n > 1 . 2 v , v s e t = h i g h 3 0 4 8 e n > 1 . 2 v , v s e t = f l o a t i n g 1 0 1 8 e n > 1 . 2 v , v s e t = g n d 5 1 2 s h u t d o w n c u r r e n t i s d e n = 0 v 0 . 1 1 u a w a k e - u p t i m e t w u e n f r o m l o w t o h i g h 4 0 m s c h i p e n a b l e v e h 1 . 2 c h i p d i s a b l e v e l 0 . 4 g s e t / v s e t h i g h v h v d d - 0 . 5 v d d g s e t / v s e t f l o a t i n g v f 1 v d d - 1 g s e t / v s e t l o w v l 0 0 . 5 u n d e r v o l t a g e l o c k o u t t h r e s h o l d u v l o v d d f r o m h i g h t o l o w 2 . 2 u n d e r v o l t a g e l o c k o u t h y s t e r e s i s u v l o h v d d f r o m l o w t o h i g h 0 . 2 t h e r m a l s h u t d o w n t h r e s h o l d o t p 1 5 0 t h e r m a l s h u t d o w n l o c k o u t h y s t e r e s i s o t p h 3 0 b o o s t c o n v e r t o r v o 1 v s e t = g n d , n o l o a d 7 . 2 8 8 . 8 v v o 2 v s e t = n c , n o l o a d 1 0 . 8 1 2 1 3 . 2 v v o 3 v s e t = a v d d , n o l o a d 1 6 1 7 . 5 1 9 v c u r r e n t l i m i t c l a v e r a g e i n p u t c u r r e n t 0 . 8 a l o w s i d e m o s f e t r d s o n r l s i o = 5 0 m a 0 . 5 b o o s t s w i t c h i n g f r e q u e n c y f o s c b 1 . 1 1 . 5 1 . 9 m h z c l a s s d c l a s s d a m p l i f i e r s w i t c h i n g f r e q u e n c y f o s c d i n p u t a c - g n d 2 2 5 3 7 5 4 7 5 k h z c o m m o n m o d e r e j e c t r a t i o c m r r v i n = + - 1 0 0 m v , v d d = 3 . 6 v 6 0 d b o u p u t o f f s e t v o l t a g e v o s o u t p u t o f f s e t v o l t a g e 5 5 0 m v h i g h s i d e 1 . 5 l o w s i d e 0 . 6 a v 1 g s e t = a v d d , v o = 1 v r m s 2 5 2 6 2 7 a v 2 g s e t = n c , v o = 1 v r m s 2 1 2 2 2 3 a v 3 g s e t = g n d , v o = 1 v r m s 1 7 1 8 1 9 p o w e r s u p p l y r e j e c t r a t i o p s r r 2 0 0 m v p p s u p p l y r i p p l e a t 2 1 7 h z 7 0 d b t o t a l h a r m o n i c d i s t o r t i o n p l u s n o i s e t h d + n v o = 5 v r m s 0 . 3 % s i g n a l t o n o i s e r a t i o s n r i n p u t a c g r o u n d , a - w e i g h t i n g 9 0 d b i q c l o s e d - l o o p v o l t a g e g a i n v d b m a v v o u t p u t v o l t a g e r d s o n r p q u i e s c e n t c u r r e n t
0 1 8 2 4 6 8 1 0 1 2 1 4 1 6 2 0 2 0 k 5 0 1 0 0 2 0 0 5 0 0 1 k 2 k 5 k 1 0 k h z 0 1 8 2 4 6 8 1 0 1 2 1 4 1 6 2 0 2 0 k 5 0 1 0 0 2 0 0 5 0 0 1 k 2 k 5 k 1 0 k h z 0 . 0 3 1 0 0 . 0 5 0 . 1 0 . 2 0 . 5 1 2 5 2 0 2 0 k 5 0 1 0 0 2 0 0 5 0 0 1 k 2 k 5 k 1 0 k h z 0 . 0 3 1 0 0 . 0 5 0 . 1 0 . 2 0 . 5 1 2 5 2 0 2 0 k 5 0 1 0 0 2 0 0 5 0 0 1 k 2 k 5 k 1 0 k h z PAM8902 30-vpp mono class-d audio amplifier for piezo/ceramic speakers 6 , power analog microelectronics inc www.poweranalog.com typical operating characteristics t =25 c, v =4.2v,gain=26db,cin=1uf,cload=1uf, unless otherwise noted a dd . 4. thd+n vs frequency 3. thd+n vs frequency 2. total input power vs output voltage 1. total supply current vs output voltage 5. output voltage rms vs frequency 6. output voltage rms vs frequency 0 2 0 4 0 6 0 8 0 1 0 0 1 2 0 1 4 0 1 6 0 0 2 4 6 8 1 0 1 2 o u t p u t v o l t a g e ( v r m s ) v d d = 3 . 6 v v d d = 4 . 2 v v d d = 5 . 5 v 0 0 . 1 0 . 2 0 . 3 0 . 4 0 . 5 0 . 6 0 2 4 6 8 1 0 1 2 o u t p u t v o l t a g e ( v r m s ) v d d = 3 . 6 v v d d = 4 . 2 v v d d = 5 . 5 v frequency(hz) vdd=3.6v vdd=4.2v vdd=5.5v frequency(hz) vdd=3.6v vdd=4.2v vdd=5.5v frequency(hz) vo=4vrms vo=6vrms vo=2vrms vdd=3.6v frequency(hz) vdd=5.5v vo=4vrms vo=6vrms vo=2vrms d=1% vset high d=10% vset high 01/2012 rev1.4
0 8 1 2 3 4 5 6 7 2 0 2 0 k 5 0 1 0 0 2 0 0 5 0 0 1 k 2 k 5 k 1 0 k h z 0 8 1 2 3 4 5 6 7 2 0 2 0 k 5 0 1 0 0 2 0 0 5 0 0 1 k 2 k 5 k 1 0 k h z 0 1 2 1 2 3 4 5 6 7 8 9 1 0 1 1 2 0 2 0 k 5 0 1 0 0 2 0 0 5 0 0 1 k 2 k 5 k 1 0 k h z 0 1 0 1 2 3 4 5 6 7 8 9 2 0 2 0 k 5 0 1 0 0 2 0 0 5 0 0 1 k 2 k 5 k 1 0 k h z d=1% vset low PAM8902 30-vpp mono class-d audio amplifier for piezo/ceramic speakers 7 , power analog microelectronics inc www.poweranalog.com typical operating characteristics t =25 c, v =5v,gain=18db, unless otherwise noted a dd . 10. output voltage rms vs frequency 9. output voltage rms vs frequency 8. output voltage rms vs frequency 7. output voltage rms vs frequency vdd=3.6v vdd=5.5v frequency(hz) frequency(hz) vdd=3.6v vdd=4.2v vdd=5.5v frequency(hz) vdd=4.2v vdd=3.6v vdd=5.5v vdd=4.2v frequency(hz) vdd=3.6v vdd=5.5v vdd=4.2v d=10% vset floating d=1% vset floating d=10% vset low 12. output voltage rms vs thd+n 11. output voltage rms vs thd+n 0 . 1 2 0 0 . 2 0 . 5 1 2 5 1 0 0 1 6 2 4 6 8 1 0 1 2 1 4 v vdd=3.6v vset high output voltage rms 0 . 1 2 0 0 . 2 0 . 5 1 2 5 1 0 0 1 0 1 2 3 4 5 6 7 8 9 v vdd=4.2v vset floating output voltage rms 01/2012 rev1.4
PAM8902 30-vpp mono class-d audio amplifier for piezo/ceramic speakers 8 , power analog microelectronics inc www.poweranalog.com 01/2012 rev1.4 application information select boost convertor output voltage customer can use vset pin to set boost converor output voltage between 8v,12v and 17.5v. vset pin configuration table as below: input resistance (ri) g=20 log [12.8*rf/(rin+rex)] (db) input capacitors (ci ) decoupling capacitor the input resistors (ri=rin+rex) set the gain of the amplifier according to equation 1 when anti-sa turation is inactive. where rin is a 77.4k internal resistor, rex is the external input resistor,rf is a 122.6k internal resistor. resistor matching is very important in fully differential amplifiers. the balance of the output on the reference voltage depends on matched ratios of the resistors. cmrr, psrr, and cancellation of the second harmonic distortion dimini sh if resistor mismatch occurs. therefore, it is recommended to use 1% tolerance resistors or better to keep the performance optimized. matching is more important than ov erall tolerance. resistor arrays with 1% matching can be used with a tolerance greater than 1%. place the input resistors very close to the PAM8902 to limit noise injection on the high-impedance nodes. for optimal performance the gain should be set to lower. lower gain allows the PAM8902 to operate a t its best, and keeps a high voltage at the input making the inputs less susceptible to noise. in addition to these features, higher value of ri minimizes pop noise. in the typical application, an input capacitor, ci, is required to allow the amplifier to bias the input signal to the proper dc level for optimum operation. in this case, ci and the minimum input impedance ri form is a high-pass filter with the corner frequency determined in the follow equation: it is important to consider the value of ci as it directly affects the low frequency performance of the circuit. for example, when ri is 150k and the specification calls for a flat bass response are down to 150hz . equation is reconfigured as followed: when input resistance variation is considered, the ci is 7nf, so one would likely choose a value of 10nf. a further consideration for this capacitor is the leakage path from the input source through the inpu t network (ci, ri + rf) to the load. this leakage current creates a dc offset voltage at the input to the amplifier that reduces useful headroom, especially in high gain applications. for this reason, a low-leakage tanta lum or ceramic capacitor is the best choice. when polarized capacitors are used, the positive side of the capacitor should face the amplifier input in most applications as the dc level is held at v /2, which is likel y higher than the source dc level. please note that it is important to confirm the capacitor polarity in the application. the PAM8902 is a high-performance cmos audio amplifier that requires adequate power supply decoupling to ensure the output total harmonic distortion (thd) as low as possible. the optimum decoupling is achieved by using two different types of capacitors that target on differ ent types of noise on the power supply leads. for higher frequency transients, spikes, or digital hash on the line, a dd v s e t p i n c o n f i g u r a t i o n m i n m a x p v c c v o l t a g e a u d i o a m p l i f i e r m a x i m u m o u t p u t v o l t a g e c o n n e c t t o a v d d a v d d - 0 . 5 v a v d d 1 7 . 5 v 1 1 v r m s ( v p p = 3 1 . 1 v ) f l o a t i n g 1 v a v d d - 1 v 1 2 v 8 v r m s ( v p p = 2 2 . 6 v ) c o n n e c t t o g n d g n d 0 . 5 v 8 v 5 v r m s ( v p p = 1 4 . 1 v ) g s e t r i n r f b g s e t = v d d 7 7 . 4 k 1 2 2 . 6 k g s e t = f l o a t i n g 1 0 0 k 1 0 0 k g s e t = g n d 1 2 2 . 6 k 7 7 . 4 k r i f c c i p 2 1 = r i c i f c p 2 1 =
PAM8902 30-vpp mono class-d audio amplifier for piezo/ceramic speakers 9 , power analog microelectronics inc www.poweranalog.com 01/2012 rev1.4 application information good low equivalent series-resistance (esr) ceramic capacitor, typically 1 f, is placed as close as possible to the device avdd pin for the best operation. for filtering lower frequency noise signals , a large ceramic capacitor of 10 f or greater placed near the avdd supply trace is recommended. use external schottky diode can get the best driving capability and efficiency. since internal power diode has limited driving capability ,only in following conditions customer ca n remove the external schottky diode to reduce the cost. 1. vset = gnd or floating and c less than 1uf. 2. the signal frequency less than 4khz. 3. haptic application (50-500hz) in order to reduce power consumption while not in use, the PAM8902 contains shutdown circuitry ampl ifier off when a logic low is placed on the ena pin. by switching the ena pin connected to gnd, the pam89 02 supply current draw will be minimized in idle mode. the PAM8902 incorporates circuitry designed to detect supply voltage. when the supply voltage dro ps to 2.2v or below, the PAM8902 goes into a state of shutdown, and the device comes out of its shutdown state and restore to normal function only when reset the power supply or ena pin. the PAM8902 has short circuit protection circuitry on the outputs to prevent the device from damage when output-to-output shorted or output-to-gnd shorted occurs. when a short circuit occurs, the device g oes into a latch state and must be reset by cycling the voltage on the ena pin to a logic low and then back t o the logic high state for normal operation. this will clear the short-circuit flag and allow for normal operation if the short was removed. if the short was not removed, the protection circuitry will again activate. thermal protection on the PAM8902 prevents the device from damage when the internal die temperature exceeds 150c. there is a 15c tolerance on this trip point from device to device. once the die tem perature exceeds the set point, the device will enter the shutdown state and the outp uts are disabled,in this condition both out+ and out- will become high impedance. this is not a latched fault. the thermal f ault is cleared once the temperature of the die decreased by 30c. this large hysteresis will prevent motor boating sound well and the device begins normal operation at this point with no external system int eraction. external schottky diode shutdown operation under voltage lock-out (uvlo) short circuit protection (scp) over temperature protection (otp) l
10 , power analog microelectronics inc www.poweranalog.com ordering information PAM8902 30-vpp mono class-d audio amplifier for piezo/ceramic speakers 01/2012 rev1.4 pin configuration PAM8902 - x x x p number of pins package type pam confidential p a r t n u m b e r m a r k i n g p a c k a g e t y p e m o q p a m 8 9 0 2 z e r - p b g y w c s p - 1 6 l 3 , 0 0 0 u n i t s / t a p e & r e e l p a m 8 9 0 2 k e r - p p 8 9 0 2 x x x y w q f n 4 x 4 - 1 6 l 3 , 0 0 0 u n i t s / t a p e & r e e l marking instruction y : last digital of manufacturing year 6: 2006 7: 2007 8: 2008 9: 2009 0: 2010 1: 2011 w : week code i t e m w e e k c o d e i t e m w e e k c o d e i t e m w e e k c o d e i t e m w e e k c o d e 1 a 1 4 n 2 7 a 4 0 n 2 b 1 5 o 2 8 b 4 1 o 3 c 1 6 p 2 9 c 4 2 p 4 d 1 7 q 3 0 d 4 3 q 5 e 1 8 r 3 1 e 4 4 r 6 f 1 9 s 3 2 f 4 5 s 7 g 2 0 t 3 3 g 4 6 t 8 h 2 1 u 3 4 h 4 7 u 9 i 2 2 v 3 5 i 4 8 v 1 0 j 2 3 w 3 6 j 4 9 w 1 1 k 2 4 x 3 7 k 5 0 x 1 2 l 2 5 y 3 8 l 5 1 y 1 3 m 2 6 z 3 9 m 5 2 z
11 , power analog microelectronics inc www.poweranalog.com outline dimensions csp-16 PAM8902 30-vpp mono class-d audio amplifier for piezo/ceramic speakers 1.95 0.02 1.93 0.02 units:millimeter 1.00 0.50 0.38 0.04 0.235 0.02 (stand off) 01/2012 rev1.4 d 4 coplanarity(flatness) max 0.05
12 , power analog microelectronics inc www.poweranalog.com outline dimensions qfn4x4-16 PAM8902 30-vpp mono class-d audio amplifier for piezo/ceramic speakers 01/2012 rev1.4
13 , power analog microelectronics inc www.poweranalog.com datasheet revision history PAM8902 30-vpp mono class-d audio amplifier for piezo/ceramic speakers 01/2012 rev1.4 d a t e r e v i s i o n d e s c r i p t i o n c o m m e n t 0 3 / 0 3 / 2 0 1 1 a d v a n c e d c h a n g e p r o d u c t c o d e f r o m " b h " t o " b g " 0 4 / 0 7 / 2 0 1 1 p r e l i m i n a r y u p d a t e " b l o c k d i a g r a m " 0 5 / 2 5 / 2 0 1 1 r e v 1 . 0 i n i t i a l l y r e l e a s e d 1 1 / 2 2 / 2 0 1 1 r e v 1 . 1 a d d " a p p l i c a t i o n i n f o r m a t i o n " 1 2 / 1 5 / 2 0 1 1 r e v 1 . 2 a d d " - p " t o t h e p a r t n u m b e r i n " o r d e r i n g i n f o r m a t i o n " 1 2 / 2 2 / 2 0 1 1 r e v 1 . 3 a d d " p i n 1 i n d i c a t o r " o n p a g e 3 a n d a d d " m a r k i n g i n s t r u c t i o n " o n p a g e 1 0 u p d a t e " t h e r m a l i n f o r m a t i o n " a n d " e l e c t r i c a l c h a r a t e r i s t i c " 1 2 / 2 8 / 2 0 1 1 r e v 1 . 3 a d d " c o p l a n a r i t y ( f l a t n e s s ) " v a l u e i n t h e o u t l i n e d i m e n s i o n 0 1 / 0 5 / 2 0 1 2 r e v 1 . 4 a d d " p s r r , t h d + n , s n r " p a r a m e t e r s t o s p e c

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