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? cellular phone ? portable electronic devices ? pdas and smart phones ? portable computer 9 ? pin flip ? chip wcsp marking diagrams 8 pin udfn 2x2.2 a1 a3 c1 1 1 8 KBA2338 kingbor technology co.,ltd tel:(86)0755-26508846 fax:(86)0755-26509052 general description features applications 3 w f ilte rle ss c la ss-d audio p owe r am plifie r the kb2338a is a high efficiency, 3w mono class-d audio power amplifier. a low noise, filterless pwm architecture eliminates the output filter, reduci ng external component count, system cost, and simplifying design. operating in a single 5v supply, kb2338a is capable of driving 4 speaker load at a continuous average output of 3w/10% thd+n or 2w/1% thd+n. the kb2338a has high efficiency with speaker load compared to a typical class ab amplifier. with a 3.6v supply driving an 8 speaker , the efficiency for a 400mw power level is 88%. in cellular handsets, the earpiece, speaker phone, and melody ringer can each be driven by the kb2338a. the gain of kb2338a is externally configurable which allows independent gain control from multiple sources by summing signals from seperate sources. the kb2338a is available in space-saving wcsp and dfn packages. z unique modulation scheme reduces emi emissions z efficiency at 3.6v with an 8- speaker: 88% at 400 mw 80% at 100 mw z low 2.38-ma quiescent current and 0.5-a shutdown current z 2.5v to 6.0v wide supply voltage z optimized pwm output stage eliminates lc output filter z improved psrr ( 72 db) eliminates need for a voltage regulator z fully differential design reduces rf rectification and eliminates bypass capacitor z improved cmrr eliminates two input coupling capacitors z internally generated 250-khz switching frequency z integrated pop and click suppression circuitry z 1.5mm u 1.5mm wafer chip scale package (wcsp) and 3mm u 3mm dfn-8 package z rohs compliant and 100% lead(pb)-free ordering information order number package type marking operating temperature range KBA2338b-udfn udfn-8 xxxx -40 c to 85c KBA2338-wcsp wcsp-9 a20 5 -40 c to 85c march 2007 1 a20 5 c3 8 7 6 5 1 2 3 4 gnd inp outm vp sd outp inm nc
KBA2338 9 ? pin flip ? chip wcsp c3 c2 c1 b3 b2 b1 a3 a2 a1 gnd outm outp vp sd inm inp gnd (top view) 1 2 3 4 8 7 6 5 gnd inp outm vp sd outp inm nc udfn8 (top view) data processor gnd outp figure 1. typical application outm r f r i positive differential input inp r f r i negative differential input inm r l= 8 shutdown control sd v p cs ramp generator battery 300 k v ih v il cmos output stage pin no. symbol type description wcsp udfn8 a1 3 inp i positive differential input. a2 7 gnd i analog ground. a3 8 outm o negative btl output. b1 v p i analog positive supply. range: 2.5 v C 6.0 v. b2 6 v p i power analog positive supply. range: 2.5 v C 6.0 v. b3 7 gnd i analog ground. c1 4 inm i negative differential input. c2 1 sd i the device enters in shutdown mode when a low level is applied on this pin. an internal 300 k resistor will force the device in shutdown mode if no signal is applied to this pin. it also helps to save space and cost. c3 5 outp o positive btl output. pin configuration pin description gain= 300 k r i KBA2338 kingbor technology co.,ltd tel:(86)0755-26508846 fax:(86)0755-26509052 march 2007 2 vp
symbol rating max unit v p supply voltage active mode shutdown mode 6.0 7.0 v v in input voltage ? 0.3 to v cc +0.3 v i out max output current (note 1) 1.5 a p d power dissipation (note 2) internally limited ? t a operating ambient temperature ? 40 to +85 c t j max junction temperature 150 c t stg storage temperature range ? 65 to +150 c r ja thermal resistance junction ? to ? air 9 ? pin flip ? chip udfn8 90 (note 3) 50 c/w ? ? esd protection human body model (hbm) (note 4) machine model (mm) (note 5) > 2000 > 200 v ? latchup current @ t a = 85 c (note 6) 9 ? pin flip ? chip udfn8 70 100 ma msl moisture sensitivity (note 7) level 1 stresses exceeding maximum ratings may damage the device. maximum ratings are stress ratings only. functional operation above t he recommended operating conditions is not implied. extended exposure to stresses above the recommended operating conditions may af fect device reliability. 1. the device is protected by a current breaker structure. see current breaker circuit in the description information section for more information. 2. the thermal shutdown is set to 160 c (typical) avoiding irreversible damage to the device due to power dissipation. 3. for the 9 ? pin flip ? chip csp package, the r ja is highly dependent of the pcb heatsink area. for example, r ja can equal 195 c/w with 50 mm 2 total area and also 135 c/w with 500 mm 2 . when using ground and power planes, the value is around 90 c/w, as specified in table. 4. human body model: 100 pf discharged through a 1.5 k resistor following specification jesd22/a114. on 9 ? pin flip ? chip, b2 pin (v p ) is qualified at 1500 v. 5. machine model: 200 pf discharged through all pins following specification jesd22/a115. 6. latchup testing per jedec standard jesd78. 7. moisture sensitivity level (msl): 1 per ipc/jedec standard: j ? std ? 020a. KBA2338 kingbor technology co.,ltd tel:(86)0755-26508846 fax:(86)0755-26509052 absolute maximum ratings march 2007 3
(limits apply for t a = +25 c unless otherwise noted) (wcsp) characteristic symbol conditions min typ max unit operating supply voltage v p t a = ? 40 c to +85 c 2.5 ? 6.0 v supply quiescent current i dd v p = 3.6 v, r l = 8.0 v p = 5.5 v, no load v p from 2.5 v to 5.5 v, no load t a = ? 40 c to +85 c ? ? ? 2.15 2.61 ? ? ? 4.6 ma shutdown current i sd v p = 4.2 v t a = +25 c t a = +85 c ? ? 0.42 0.45 0.8 ? a v p = 5.5 v t a = +25 c t a = +85 c ? ? 0.8 0.9 1.5 ? a shutdown voltage high v sdih 1.2 ? ? v shutdown voltage low v sdil ? ? 0.4 v switching frequency f sw v p from 2.5 v to 5.5 v t a = ? 40 c to +85 c 190 250 310 khz gain g r l = 8.0 285 k r i 300 k r i 315 k r i v v output impedance in shutdown mode z sd ? 300 ? resistance from sd to gnd rs ? ? 300 ? k output offset voltage vos v p = 5.5 v ? 6.0 ? mv turn on time to n v p from 2.5 v to 5.5 v ? 9.0 ? ms turn off time to ff v p from 2.5 v to 5.5 v ? 5.0 ? ms thermal shutdown temperature ts d ? ? 160 ? c output noise voltage vn v p = 3.6 v, f = 20 hz to 20 khz no weighting filter with a weighting filter ? ? 65 42 ? ? vrms rms output power po r l = 8.0 , f = 1.0 khz, thd+n < 1% v p = 2.5 v v p = 3.0 v v p = 3.6 v v p = 4.2 v v p = 5.0 v ? ? ? ? ? 0.32 0.48 0.7 0.97 1.38 ? ? ? ? ? w r l = 8.0 , f = 1.0 khz, thd+n < 10% v p = 2.5 v v p = 3.0 v v p = 3.6 v v p = 4.2 v v p = 5.0 v ? ? ? ? ? 0.4 0.59 0.87 1.19 1.7 ? ? ? ? ? w r l = 4.0 , f = 1.0 khz, thd+n < 1% v p = 2.5 v v p = 3.0 v v p = 3.6 v v p = 4.2 v v p = 5.0 v ? ? ? ? ? 0.49 0.72 1.06 1.62 2.12 ? ? ? ? ? w r l = 4.0 , f = 1.0 khz, thd+n < 10% v p = 2.5 v v p = 3.0 v v p = 3.6 v v p = 4.2 v v p = 5.0 v ? ? ? ? ? 0.6 0.9 1.33 2.0 2.63 ? ? ? ? ? w KBA2338 kingbor technology co.,ltd tel:(86)0755-26508846 fax:(86)0755-26509052 electrical characteristics march 2007 4
(limits apply for t a = +25 c unless otherwise noted) (wcsp) characteristic unit max typ min conditions symbol efficiency ? r l = 8.0 , f = 1.0 khz v p = 5.0 v, p out = 1.2 w v p = 3.6 v, p out = 0.6 w ? ? 91 90 ? ? % r l = 4.0 , f = 1.0 khz v p = 5.0 v, p out = 2.0 w v p = 3.6 v, p out = 1.0 w ? ? 82 81 ? ? total harmonic distortion + noise thd+n v p = 5.0 v, r l = 8.0 , f = 1.0 khz, p out = 0.25 w v p = 3.6 v, r l = 8.0 , f = 1.0 khz, p out = 0.25 w ? ? 0.05 0.09 ? ? % common mode rejection ratio cmrr v p from 2.5 v to 5.5 v v ic = 0.5 v to v p ? 0.8 v v p = 3.6 v, v ic = 1.0 v pp f = 217 hz f = 1.0 khz ? ? ? ? 62 ? 56 ? 57 ? ? ? db power supply rejection ratio psrr v p_ripple_pk ? pk = 200 mv, r l = 8.0 , inputs ac grounded v p = 3.6 v f = 217 khz f = 1.0 khz ? ? ? 62 ? 65 ? ? db (limits apply for t a = +25 c unless otherwise noted) (udfn) characteristic symbol conditions min typ max unit operating supply voltage v p t a = ? 40 c to +85 c 2.5 ? 6.0 v supply quiescent current i dd v p = 3.6 v, r l = 8.0 v p = 5.5 v, no load v p from 2.5 v to 5.5 v, no load t a = ? 40 c to +85 c ? ? ? 2.15 2.61 ? ? ? 3.8 ma shutdown current i sd v p = 4.2 v t a = +25 c t a = +85 c ? ? 0.42 0.45 0.8 2.0 a v p = 5.5 v t a = +25 c t a = +85 c ? ? 0.8 0.9 1.5 ? a shutdown voltage high v sdih 1.2 ? ? v shutdown voltage low v sdil ? ? 0.4 v switching frequency f sw v p from 2.5 v to 5.5 v t a = ? 40 c to +85 c 180 240 300 khz gain g r l = 8.0 285 k r i 300 k r i 315 k r i v v output impedance in shutdown mode z sd ? 20 ? k resistance from sd to gnd rs ? ? 300 ? k output offset voltage vos v p = 5.5 v ? 6.0 ? mv turn on time to n v p from 2.5 v to 5.5 v ? 1.0 ? s turn off time to ff v p from 2.5 v to 5.5 v ? 1.0 ? s thermal shutdown temperature ts d ? ? 160 ? c output noise voltage vn v p = 3.6 v, f = 20 hz to 20 khz no weighting filter with a weighting filter ? ? 65 42 ? ? vrms KBA2338 kingbor technology co.,ltd tel:(86)0755-26508846 fax:(86)0755-26509052 electrical characteristics electrical characteristics march 2007 5
(limits apply for t a = +25 c unless otherwise noted) (udfn) characteristic unit max typ min conditions symbol rms output power po r l = 8.0 , f = 1.0 khz, thd+n < 1% v p = 2.5 v v p = 3.0 v v p = 3.6 v v p = 4.2 v v p = 5.0 v ? ? ? ? ? 0.22 0.33 0.45 0.67 0.92 ? ? ? ? ? w r l = 8.0 , f = 1.0 khz, thd+n < 10% v p = 2.5 v v p = 3.0 v v p = 3.6 v v p = 4.2 v v p = 5.0 v ? ? ? ? ? 0.36 0.53 0.76 1.07 1.49 ? ? ? ? ? w r l = 4.0 , f = 1.0 khz, thd+n < 1% v p = 2.5 v v p = 3.0 v v p = 3.6 v v p = 4.2 v v p = 5.0 v ? ? ? ? ? 0.24 0.38 0.57 0.83 1.2 ? ? ? ? ? w r l = 4.0 , f = 1.0 khz, thd+n < 10% v p = 2.5 v v p = 3.0 v v p = 3.6 v v p = 4.2 v v p = 5.0 v ? ? ? ? ? 0.52 0.8 1.125 1.58 2.19 ? ? ? ? ? w efficiency ? r l = 8.0 , f = 1.0 khz v p = 5.0 v, p out = 1.2 w v p = 3.6 v, p out = 0.6 w ? ? 87 87 ? ? % r l = 4.0 , f = 1.0 khz v p = 5.0 v, p out = 2.0 w v p = 3.6 v, p out = 1.0 w ? ? 79 78 ? ? total harmonic distortion + noise thd+n v p = 5.0 v, r l = 8.0 , f = 1.0 khz, p out = 0.25 w v p = 3.6 v, r l = 8.0 , f = 1.0 khz, p out = 0.25 w ? ? 0.05 0.06 ? ? % common mode rejection ratio cmrr v p from 2.5 v to 5.5 v v ic = 0.5 v to v p ? 0.8 v v p = 3.6 v, v ic = 1.0 v pp f = 217 hz f = 1.0 khz ? ? ? ? 62 ? 56 ? 57 ? ? ? db power supply rejection ratio psrr v p_ripple_pk ? pk = 200 mv, r l = 8.0 , inputs ac grounded v p = 3.6 v f = 217 khz f = 1.0 khz ? ? ? 62 ? 65 ? ? db KBA2338 kingbor technology co.,ltd tel:(86)0755-26508846 fax:(86)0755-26509052 electrical characteristics march 2007 6
figure 2. test setup for graphs outm outp gnd r i inp inm vp r i c i c i + ? + ? 4.7 f + ? audio input signal load 30 khz low pass filter measurement input power supply KBA2338 notes: 1. unless otherwise noted, c i = 100 nf and r i = 150 k . thus, the gain setting is 2 v/v and the cutoff frequency of the input high pass filter is set to 10 hz. input capacitors are shorted for cmrr measurements. 2. to closely reproduce a real application case, all measurements are performed using the following loads: r l = 8 means load = 15 h + 8 + 15 h r l = 4 means load = 15 h + 4 + 15 h very low dcr 15 h inductors (50 m ) have been used for the following graphs. thus, the electrical load measurements are performed on the resistor (8 or 4 ) in differential mode. 3. for efficiency measurements, the optional 30 khz filter is used. an rc low ? pass filter is selected with (100 , 47 nf) on each pwm output. KBA2338 kingbor technology co.,ltd tel:(86)0755-26508846 fax:(86)0755-26509052 march 2007 7
efficiency % p out (w) die temperature ( c) p out (w) 60 0 0.1 0.2 die temperature ( c) p out (w) v p = 3.6 v r l = 8 KBA2338 class ab 0.3 0.4 55 50 45 40 35 30 25 20 20 30 40 50 60 70 80 90 100 0 0.2 0.4 die temperature ( c) p out (w) v p = 5 v r l = 8 KBA2338 class ab figure 3. efficiency vs. p out v p = 5 v, r l = 8 , f = 1 khz figure 4. die temperature vs. p out v p = 5 v, r l = 8 , f = 1 khz @ t a = +25 c figure 5. efficiency vs. p out v p = 3.6 v, r l = 8 , f = 1 khz figure 6. efficiency vs. p out v p = 5 v, r l = 4 , f = 1 khz efficiency (%) p out (w) v p = 3.6 v r l = 8 class ab efficiency (%) p out (w) v p = 5 v r l = 8 KBA2338 dfn class ab 0.6 0.8 1.0 1.2 1.4 0.5 0.6 0.7 v p = 5 v r l = 4 class ab 0 10 20 30 40 50 60 70 80 100 0 0.2 0.4 0.6 0.8 1 90 KBA2338 wcsp 0 10 20 30 40 50 60 70 80 90 100 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 KBA2338 dfn KBA2338 wcsp figure 7. die temperature vs. p out v p = 5 v, r l = 4 , f = 1 khz @ t a = +25 c 0 10 20 30 40 50 60 70 80 90 0 0.5 1 1.5 2 KBA2338 dfn KBA2338 wcsp 160 0 0.5 1.0 v p = 5 v r l = 4 KBA2338 class ab 1.5 2.0 140 120 100 80 60 40 20 figure 8. die temperature vs. p out v p = 3.6 v, r l = 8 , f = 1 khz @ t a = +25 c KBA2338 kingbor technology co.,ltd tel:(86)0755-26508846 fax:(86)0755-26509052 march 2007 8 typical performance characteristics
0.01 0.1 1.0 10 0 0.1 0.2 0.3 0.4 0.5 0.6 thd+n (%) p out (w) v p = 3 v r l = 8 f = 1 khz 0.01 0.1 1.0 10 0 0.2 0.4 0.6 0.8 1.0 1.2 thd+n (%) p out (w) v p = 4.2 v r l = 8 f = 1 khz efficiency % p out (w) v p = 3.6 v r l = 4 class ab 100 0 0.2 0.4 die temperature ( c) p out (w) 0.6 0.8 90 80 70 60 50 40 30 20 1.0 v p = 3.6 v r l = 4 KBA2338 class ab figure 9. efficiency vs. p out v p = 3.6 v, r l = 4 , f = 1 khz figure 10. die temperature vs. p out v p = 3.6 v, r l = 4 , f = 1 khz @ t a = +25 c figure 11. thd+n vs. p out v p = 5 v, r l = 8 , f = 1 khz 0.01 0.1 1.0 10 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 figure 12. thd+n vs. p out v p = 4.2 v, r l = 8 , f = 1 khz figure 13. thd+n vs. p out v p = 3.6 v, r l = 8 , f = 1 khz figure 14. thd+n vs. p out v p = 3 v, r l = 8 , f = 1 khz thd+n (%) p out (w) v p = 5.0 v r l = 8 f = 1 khz 0.01 0.1 1.0 10 0 0.2 0.4 0.6 0.8 thd+n (%) p out (w) v p = 3.6 v r l = 8 f = 1 khz 0 10 20 30 40 50 60 70 80 90 0 0.2 0.4 0.6 0.8 1 1.2 KBA2338 dfn KBA2338 wcsp KBA2338 dfn KBA2338 wcsp KBA2338 dfn KBA2338 wcsp KBA2338 dfn KBA2338 wcsp KBA2338 dfn KBA2338 wcsp KBA2338 kingbor technology co.,ltd tel:(86)0755-26508846 fax:(86)0755-26509052 march 2007 9 typical performance characteristics
0.1 1.0 10 0 0.1 0.2 0.3 0.4 thd+n (%) p out (w) v p = 2.5 v r l = 4 f = 1 khz 0.5 0.6 0.1 1.0 10 0 0.2 0.4 0.6 0.8 thd+n (%) p out (w) v p = 3 v r l = 4 f = 1 khz 10 0 0.5 1.0 thd+n (%) p out (w) 1.5 2.0 1.0 0.1 0.01 2.5 v p = 5 v r l = 4 f = 1 khz figure 15. thd+n vs. pout v p = 2.5 v, r l = 8 , f = 1 khz figure 16. thd+n vs. pout v p = 5 v, r l = 4 , f = 1 khz figure 17. thd+n vs. pout v p = 4.2 v, r l = 4 , f = 1 khz figure 18. thd+n vs. pout v p = 3.6 v, r l = 4 , f = 1 khz figure 19. thd+n vs. power out v p = 3 v, r l = 4 , f = 1 khz figure 20. thd+n vs. power out v p = 2.5 v, r l = 4 , f = 1 khz 0.01 0.1 1.0 10 0 0.1 0.2 0.3 0.4 thd+n (%) p out (w) v p = 2.5 v r l = 8 f = 1 khz 0.01 0.1 1.0 10 0 0.5 1.0 1.5 2.0 thd+n (%) p out (w) v p = 4.2 v r l = 4 f = 1 khz 0.01 0.1 1.0 10 0 0.4 0.8 1.2 1.4 thd+n (%) p out (w) v p = 3.6 v r l = 4 f = 1 khz 0.2 0.6 1.0 1.0 KBA2338 dfn KBA2338 wcsp KBA2338 kingbor technology co.,ltd tel:(86)0755-26508846 fax:(86)0755-26509052 march 2007 10 typical performance characteristics
10 ? 20 100 1000 10000 10000 0 frequency (hz) pssr (db) inputs to gnd r l = 4 v p = 3.6 v v p = 5 v ? 30 ? 40 ? 50 ? 60 ? 70 ? 80 10 ? 20 100 1000 10000 100000 frequency (hz) pssr (db) inputs to gnd r l = 8 v p = 3.6 v v p = 5 v ? 30 ? 40 ? 50 ? 60 ? 70 ? 80 10 0.01 0.1 1.0 10 100 1000 10000 100000 frequency (hz) thd+n (%) v p = 2.5 v v p = 5 v 10 power supply (v) figure 21. output power vs. power supply r l = 8 @ f = 1 khz figure 22. output power vs. power supply r l = 4 @ f = 1 khz 0.01 0.1 1.0 10 100 1000 10000 100000 figure 23. thd+n vs. frequency r l = 8 , p out = 250 mw @ f = 1 khz figure 24. thd+n vs. frequency r l = 4 , p out = 250 mw @ f = 1 khz figure 25. psrr vs. frequency inputs grounded, r l = 8 , vripple = 200 mvpkpk figure 26. psrr vs. frequency inputs grounded, r l = 4 , vripple = 200 mvpkpk 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 p out (w) 4.5 5.0 thd+n = 10% r l = 8 f = 1 khz power supply (v) 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 p out (w) 4.5 thd+n = 10% thd+n = 1% 2.5 3.0 r l = 4 f = 1 khz frequency (hz) thd+n (%) v p = 2.5 v v p = 3.6 v v p = 5 v v p = 3.6 v 5.0 KBA2338 dfn KBA2338 wcsp thd+n = 10% KBA2338 wcsp thd+n = 1% KBA2338 dfn thd+n = 3% KBA2338 kingbor technology co.,ltd tel:(86)0755-26508846 fax:(86)0755-26509052 march 2007 11 typical performance characteristics
10 10 100 1000 100 1000 1000 0 frequency (hz) noise ( vrms) v p = 5 v r l = 8 no weighting with a weighting 10 10 100 1000 100 1000 10000 frequency (hz) noise ( vrms) v p = 3.6 v r l = 8 no weighting with a weighting 2.5 2.8 3.5 4.5 5.5 power supply (v) shutdown current (na) r l = 8 2.6 2.4 2.2 2.0 1.8 1.6 1.4 1.2 1.0 2.5 900 3.5 4.5 5.5 power supply (v) shutdown current (na) r l = 8 800 700 600 500 400 300 200 100 0 120 3.5 130 140 150 160 temperature ( c) quiescent current (ma) thermal shutdown v p = 3.6 v r l = 8 3.0 2.5 2.0 1.5 1.0 0.5 0 10 ? 20 100 1000 10000 100000 frequency (hz) cmmr (db) v p = 3.6 v r l = 8 ? 30 ? 40 ? 50 ? 60 ? 70 ? 80 figure 27. psrr vs. frequency v p = 3.6 v, r l = 8 , vic = 200 mvpkpk figure 28. thermal shutdown vs. temperature v p = 5 v, r l = 8 , figure 29. shutdown current vs. power supply r l = 8 figure 30. quiescent current vs. power supply r l = 8 figure 31. noise floor, inputs ac grounded with 1 f v p = 3.6 v figure 32. noise floor, inputs ac grounded with 1 f v p = 5 v KBA2338 kingbor technology co.,ltd tel:(86)0755-26508846 fax:(86)0755-26509052 march 2007 12 typical performance characteristics
8 2.5 3.5 4.5 5.5 power supply (v) turn off time (ms) t a = +85 c 6 7 8 9 10 11 2.5 3.5 4.5 5.5 figure 33. turn on time figure 34. turn off time power supply (v) turn on time (ms) t a = +85 c t a = +25 c t a = ? 40 c 7 6 5 4 t a = ? 40 c t a = +25 c detailed description the basic structure of the KBA2338 is composed of one analog pre ? amplifier, a pulse width modulator and an h ? bridge cmos power stage. the first stage is externally configurable with gain ? setting resistor r i and the internal fixed feedback resistor r f (the closed ? loop gain is fixed by the ratios of these resistors) and the other stage is fixed. the load is driven differentially through two output stages. the differential pwm output signal is a digital image of the analog audio input signal. the human ear is a band pass filter regarding acoustic waveforms, the typical values of which are 20 hz and 20 khz. thus, the user will hear only the amplified audio input signal within the frequency range. the switching frequency and its harmonics are fully filtered. the inductive parasitic element of the loudspeaker helps to guarantee a superior distortion value. power amplifier the output pmos and nmos transistors of the amplifier have been designed to deliver the output power of the specifications without clipping. the channel resistance (r on ) of the nmos and pmos transistors is typically 0.4 . turn on and turn off transitions in case of 9 pin flip ? chip package in order to eliminate pop and click noises during transition, the output power in the load must not be established or cutoff suddenly. when a logic high is applied to the shutdown pin, the internal biasing voltage rises quickly and, 4 ms later, once the output dc level is around the common mode voltage, the gain is established slowly (5.0 ms). this method to turn on the device is optimized in terms of rejection of pop and click noises. thus, the total turn on time to get full power to the load is 9 ms (typical). the device has the same behavior when it is turned ? off by a logic low on the shutdown pin. no power is delivered to the load 5 ms after a falling edge on the shutdown pin. due to the fast turn on and off times, the shutdown signal can be used as a mute signal as well. turn on and turn off transitions in case of udfn8 in case of udfn8 package, the audio signal is established instantaneously after the rising edge on the shutdown pin. the audio is also suddenly cut once a low level is sent to the amplifier. this way to turn on and off the device in a very fast way also prevents from pop & click noise. shutdown function the device enters shutdown mode when the shutdown signal is low. during the shutdown mode, the dc quiescent current of the circuit does not exceed 1.5 a. current breaker circuit the maximum output power of the circuit corresponds to an average current in the load of 820 ma. in order to limit the excessive power dissipation in the load if a short ? circuit occurs, a current breaker cell shuts down the output stage. the current in the four output mos transistors are real ? time controlled, and if one current exceeds the threshold set to 1.5 a, the mos transistor is opened and the current is reduced to zero. as soon as the short ? circuit is removed, the circuit is able to deliver the expected output power. this patented structure protects the KBA2338. since it completely turns off the load, it minimizes the risk of the chip overheating which could occur if a soft current limiting circuit was used. KBA2338 kingbor technology co.,ltd tel:(86)0755-26508846 fax:(86)0755-26509052 march 2007 13 description information
outm outp r l= 8 1.0 f 15 h 15 h optional audio output filter KBA2338 wcsp application schematic KBA2338 kingbor technology co.,ltd tel:(86)0755-26508846 fax:(86)0755-26509052 march 2007 14 ferrite bead specification: z=120 @100mhz , current rating=3a c3 l2 fb l3 fb c4 1nf c5 1nf p1 vcc p2 gnd sp 1 speaker l1 fb c1 0.1uf c2 1uf c3 1uf p3 audio in sw1 normal shut down inp inn gnd vdda vdd1 outp outn gnd sdb a1 a2 a3 b1 b2 b3 c1 c2 c3 r1 150k r2 150k 4.7 f KBA2338
9 pin wcsp dim min max millimeters a 0.540 0.660 a1 0.210 0.270 a2 e d ? a ? ? b ? 0.10 c a2 a a1 ? c ? 0.05 c 0.10 c 4 x seating plane d1 e e1 e 0.05 c 0.03 c a b 9 x b c b a 12 3 d 1.450 bsc e 0.330 0.390 b 0.290 0.340 e 0.500 bsc d1 1.000 bsc e1 1.000 bsc 1.450 bsc side view top view bottom view KBA2338 kingbor technology co.,ltd tel:(86)0755-26508846 fax:(86)0755-26509052 march 2007 15 pacage description
8 pin udfn, 2x2.2, 0.5p a b e d d2 e2 bottom view b e 8x 0.10 b 0.05 a c c k 8x note 3 2x 0.10 c pin one reference top view 2x 0.10 c 8x a a1 (a3) 0.08 c 0.10 c c seating plane side view l 8x 1 4 5 8 dim min nom max millimeters a 0.45 0.50 0.55 a1 0.00 0.03 0.05 a3 0.127 ref b 0.20 0.25 0.30 d 2.00 bsc d2 1.40 1.50 1.60 e 2.20 bsc e2 0.70 0.80 0.90 e 0.50 bsc k 0.20 ??? ??? l 0.35 0.40 0.45 ?? ?? ?? ?? ?? ?? ??? ??? ??? ??? ??? ??? 8x 0.48 1.60 0.80 1 0.25 0.50 pitch 2.15 8x dimensions: millimeters soldering footprint* KBA2338 kingbor technology co.,ltd tel:(86)0755-26508846 fax:(86)0755-26509052 16 march 2007 king b or technology tel:(86)0755-26508846 fax:(86)0755-26509052 www.kingbor.com pacage description

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