PAM8905 document number: ds 37026 rev. 2 - 2 1 of 9 www.diodes.com may 2015 ? diodes incorporated PAM8905 a product line of diodes incorporated 1.9 w class - d audio amplifier with integrated boost conver ter and battery tracking agc description the PAM8905 is a high efficiency class - d audio power amplifier with an integrated boost converter. it drives up to 1.9 w (1% thd+n) into a n 8 speaker. with 85 % typical efficiency, the PAM8905 helps extend battery life when playing audio. the b uilt - in boost converter generates the voltage rail for the output stage. this provides a louder audio output than a stand - alone amplifier connected directly to the battery. it also maintains a consistent loudness, regardless of battery voltage. the pam89 05 features battery tracking agc function which adjusts the class - d gain to limit battery current at lower battery voltage . PAM8905 features dc input protection and a ll outputs are fully protected against output - to - output shorts. the PAM8905 is available in u - wlb1520 - 12 package . features ? built - in battery tracking automatic gain control (agc) ? high effici ency integrated boost converter over 85 % ? 1.9 w into an 8 load from a 3.6v supply ? operates from 2. 8 v to 5. 2 v ? efficient class - d prolongs batt ery life ? minimized on/off pop noise ? superior low noise ? high psrr ? dc input protection ? auto - recovery short - circuit protection ? thermal shutdown ? available in u - wlb1520 - 12 package pin assignments ( top view ) applications ? cell phones ? pda ? gps ? portable electronics ? speakers typical applications circuit pvdd sw out + out- en bgnd pgnd agnd in- b c d 1 2 3 v bat agc in+ a 2.8v to 5.2v 2.2uh v bat sw pvdd 10uf~22uf agnd agnd pgnd out+ out- v bat agc in+ in- audio input en agc 10uf
PAM8905 document number: ds 37026 rev. 2 - 2 2 of 9 www.diodes.com may 2015 ? diodes incorporated PAM8905 a product line of diodes incorporated 1.9 w class - d audio amplifier with integrated boost conver ter and battery tracking agc pin description s pin name pin number description pv dd a 1 boost converter output and class d amplifier power s upply out+ b1 amplifier positive audio o utput out - c1 amplifier negative audio o utput pgnd d1 class - d p ower g round sw a2 boost convertor s witching agc b2 agc i nflection p oint select c onnect to vba t, gnd or float. voltage at agc pin is only read at device power - up. a power cycle is required to change inflection points. en c2 device e nab le s et to logic high to enable agnd d 2 analog g round b gnd a3 boost c onverter p ower ground vbat b3 supply v oltag e in+ c3 positive audio i nput in - d3 negative audio i nput block diagram + - pwm modulator uvlo startup protec tion osc gate driv e gate driv e scp otp dcp vref in+ in- out+ out- v bat bias en agc pgnd boos t conv ertor pvdd sw agnd bgnd agc
PAM8905 document number: ds 37026 rev. 2 - 2 3 of 9 www.diodes.com may 2015 ? diodes incorporated PAM8905 a product line of diodes incorporated 1.9 w class - d audio amplifier with integrated boost conver ter and battery tracking agc absolute maximum ratings (@ t a = +25c, unless otherwise specified.) value unit vbat supply voltage C 0.3 to 6 .0 v v i input vo ltage, en, in+, i n C , agc C 0.3 to vbat + 0.3 v t a operating free - air temperature range C 40 to 85 c t j operating junction temperature range C 40 to 150 c t stg storage temperature range C 65 to 150 c recommended operating conditions (@ t a = +25c, unles s otherwise specified.) min max unit vbat supply voltage 2. 8 5. 2 v v ih high - level input voltage en 1.3 vbat v v il low - level input voltage en gnd 0. 6 v t a operating free - air te mperature C 40 85 c thermal information parameter symbol package maximum unit thermal resistance (junction to ambient ) ? j a u - wlb1520 - 12 85 c /w
PAM8905 document number: ds 37026 rev. 2 - 2 4 of 9 www.diodes.com may 2015 ? diodes incorporated PAM8905 a product line of diodes incorporated 1.9 w class - d audio amplifier with integrated boost conver ter and battery tracking agc electrical characteristics (@ vbat=3.6v , ag c=gnd, t a = +25c, rl=8 +33 h , unless otherwise specified.) symbol parameter test conditions min typ max unit v bat supply voltage 2. 8 ? 5. 2 v po output power thd+n=1%,f=1khz vbat = 3.6 v ? 1900 ? m w vbat =3. 0 v ? 1750 ? vbat = 2. 8 v ? 1 60 0 ? thd+ n total harmonic distortion plus noise po=1 . 0 w,r l = 8 f=1khz ? 0. 07 ? % po= 2 w,r l = 4 ? 0.1 5 ? psrr power supply ripple rejection vbat =3.6v, inputs ac - g rounded with c=1f f=217hz ? - 70 ? db f=1khz ? - 70 ? snr signal - to - noise ratio a - w eighting thd+ n=1% ? 95 ? db vop peak output voltage vbat = 3.6 v f=1khz ? 5. 75 ? v vo_th boost convertor auto - pass through threshold ? ? ? 2 ? vpk vn output noise inputs ac - g rounded no a - w eighting ? 100 ? v a - w eighting ? 6 0 ? efficiency vbat=4.2v , po= 1.5 w f=1k hz ? 8 5 ? % iq quiescent current vbat = 3.6 v no load ? 4 ? ma isd shutdown current vbat =2. 8 v to 5 .2 v en =0v ? ? 1 a rdson static drain - to source on - s tate resistor high side pmos,i=500ma vbat = 5 v ? 2 6 0 ? m low side nmos,i=500ma vbat = 5 v ? 160 ? m fsw switching frequency vbat=2. 8 v to 5 .2 v boost ? 12 00 ? khz class d ? 300 ? gv closed - l oop gain ? ? ? 20 ? db rin input impedance av=20db ? ? 2 4 ? k vos output offset voltage input ac - g round ? ? ? 1 0 mv ip eak convertor sw peak current vbat=3.6v ? ? 2 ? a ton start - up time from en ? ? ? 6 ? ms vih en input high voltage vbat =5v ? 1. 3 ? ? v vil en input low voltage vbat =5v ? ? ? 0.6
PAM8905 document number: ds 37026 rev. 2 - 2 5 of 9 www.diodes.com may 2015 ? diodes incorporated PAM8905 a product line of diodes incorporated 1.9 w class - d audio amplifier with integrated boost conver ter and battery tracking agc performance characteristics (@ vbat=3.6v , agc=gnd, t a = +25c, rl=8 +33 h , unless otherwise specified.) thd+n vs. output power (rl= 8 ) thd+n vs. output power (rl= 4 ) thd+n vs. frequency (rl= 8 ) thd +n vs. frequency (rl= 4 ) psrr vs. frequency (rl= 8 ) psrr vs. frequency(rl= 4 ) po = 0.3w / 0.5w / 1w ( red / pi nk / blue ) po = 0.3w / 0.5w / 1w ( red / pink / blue ) agc=gnd agc=gnd f =1 00hz / 1khz / 10khz ( red / pink / blue ) f =1 00hz / 1khz / 10khz ( red / pink / blue ) 0 . 03 0 . 03 - 110 t - 110 t 0 . 01 0 . 01
PAM8905 document number: ds 37026 rev. 2 - 2 6 of 9 www.diodes.com may 2015 ? diodes incorporated PAM8905 a product line of diodes incorporated 1.9 w class - d audio amplifier with integrated boost conver ter and battery tracking agc performance characteristics (@ vbat=3.6v , agc=gnd, t a = +25c, rl=8 +33uh , unless otherwise specified.) noise floor (rl= 8 ) gain vs. supply voltage efficiency vs. output power (rl=8) quiescent current vs. supply voltage start - u p shutdown vin=50mvrms agc=float / gnd / vbat ( red / blue/green ) - 120
PAM8905 document number: ds 37026 rev. 2 - 2 7 of 9 www.diodes.com may 2015 ? diodes incorporated PAM8905 a product line of diodes incorporated 1.9 w class - d audio amplifier with integrated boost conver ter and battery tracking agc ordering information PAM8905 x x x p: 12 pin z: u - wlb1520 - 12 r: tape & real part nu mber package standard package PAM8905p zr u - wlb1520 - 12 3,000units/tape & re e l marking information u - wlb1520 - 12 package type shipping package pin configuration fs: product code y : year w: week
PAM8905 document number: ds 37026 rev. 2 - 2 8 of 9 www.diodes.com may 2015 ? diodes incorporated PAM8905 a product line of diodes incorporated 1.9 w class - d audio amplifier with integrated boost conver ter and battery tracking agc package outline dimensions (all dimensions in mm.) please see ap02002 at http://www.diodes.com/datasheets/a p02002.pdf for the latest version. suggested pad layout please see ap02001 at http://www.diodes.com/datasheets/ap02001.pdf for the latest version. u - wlb1520 - 12 dim min max typ a 0.500 0.600 0.550 a1 0.185 0.235 0.210 a2 0.315 0.365 0.340 b 0.208 0.308 0.258 d 1.420 1.500 -- d2a 0.950 1.050 1.000 e 1.920 2.000 -- e2a 1.450 1.550 1.500 e 0.500 bsc sd 0.250 bsc se 0.000 bsc all dimensions in mm dimensions value (in mm) c 0.500 d 0.258 x 1.000 y 0.250 y1 1.500 d e pin #1 id b ?(12x) e a2 a seating plane e d2a e2a a sd se y1 d ?(12x) c c x y
PAM8905 document number: ds 37026 rev. 2 - 2 9 of 9 www.diodes.com may 2015 ? diodes incorporated PAM8905 a product line of diodes incorporated 1.9 w class - d audio amplifier with integrated boost conver ter and battery tracking agc important notice diodes incorporated makes no warranty of any kind, express or implied, with regards to this document, including, but not limited to, the implied warranties of merchantability and fitness for a partic ular purpose (and their equivalents under the laws of any jurisdiction). diodes incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to this document a nd any product described herein. diodes incorporated does not assume any liability arising out of the application or use of this document or any product described herein; neither does diodes incorporated convey any license unde r its patent or trademark rig hts, nor the rights of others. any customer or user of this document or products described herein in such applications shall assume all risks of such use and will agree to hold diodes incorporated and all the companies whose products are represented on di odes incorporated website, harmless against all damages. diodes incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthor ized sales channel. should customers purchase or use diodes incorporate d products for any unintended or unauthorized application, customers shall indemnify and hold diodes incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising ou t of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized application. products described herein may be covered by one or more united states, international or fore ign patents pending. product names and markings noted herein may also be covered by one or more united states, international or foreign trademarks. this document is written in english but may be translated into multiple languages for reference. only the english version of this document is the final and determinative format released by diodes incorporated. life support diodes incorporated products are specifically not authorized for use as critical components in life support devices or system s without t he express written approval of the chief executive officer of diodes incorporated. as used herein: a. life support devices or systems are devices or systems which: 1. are intended to implant into the body, or 2. support or sustain life and whose fail ure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in significant injury to the user. b. a critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or to affect its safety or effectiveness. customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety - related requirements concerning their products and any use of diodes incorporated products in such safety - critical, life support devices or systems, notwithstanding any devices - or systems - related information or support that may be provided by diodes incorporated. further, customers must fully indemnify diodes incorpora ted and its representatives against any damages arising out of the use of diodes incorporated products in such safety - critical, life support devices or systems. copyright ? 201 5 , diodes incorporated www.diodes.com
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