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AAT5101 2.5w mono filter-free class d audio power amplifier switchreg tm product datasheet 5101.2009.04.1.3 1 www.analogictech.com description the AAT5101 is a high efficiency, 2.5w mono class d audio power amplifier. the low noise, filterless pwm architecture eliminates the output filter, reduces the external component count and system cost, and simpli- fies system design. with high efficiency of up to 92% and the industry lowest 1.35ma quiescent current, it increas- es battery lifetime and dramatically lowers the junction temperature. the space saving wafer-level chip scale package (wlcsp) and minimum external component requirements make it ideal for cellular phones and pdas. with high psrr, low thd+n, and 91db snr, the AAT5101 guarantees clean sound across the wide audio output power range and the full audio frequency domain. short circuit and thermal protection with self-recovery prevents the device from being damaged during over current conditions. in cellular phones, the earpiece, speaker phone and melody ringer can each be driven by the AAT5101. also, proprietary technology successfully suppresses pop and click noise. features ? maximum battery life and minimum heat ? 1.35ma quiescent current ? 0.06 a shutdown current ? up to 92% efficiency ? large output power capabilities ? 1.35w with 8 load and thd+n < 1% ? 2.5w with 4 load and thd+n < 10% ? pop and click noise suppression circuitry ? thermal and output short circuit protection with self- recovery ? high performance, thd+n of 0.12% at 5v, 8 load and p out = 1.0w ? filter-less capability ? internally generated 250 khz switching frequency ? excellent psrr and wide supply voltage range (2.1v to 5.5v) ? fully differential design ? external gain configuration capability ? 9-pin wafer-level chip scale packaging (wlcsp) applications ? cellular phones ? mp4s ? notebook computers ? pdas ? portable dvd players typical application r i r i differential input - + + - pwm h-bridge shutdown control shutdown gnd v o + v o - in - in + r l c s to battery v dd
AAT5101 2.5w mono filter-free class d audio power amplifier switchreg tm product datasheet 2 5101.2009.04.1.3 www.analogictech.com AAT5101 2.5w mono filter-free class d audio power amplifier switchreg tm product datasheet 2 5101.2009.04.1.3 www.analogictech.com pin description pin # symbol type description a1 in+ i positive differential input. a2 gnd i analog ground. a3 vo- o negative btl output. b1 vdd i analog power supply. b2 pvdd i power supply for internal h-bridge stage. b3 gnd i analog ground. c1 in- i negative differential input. c2 shutdown the device enters shutdown mode when a low level is applied on this pin. an internal 300k will force the device into shutdown mode if no signal is applied to this pin. it also helps to save space and cost. c3 vo+ o positive btl output pin configuration wlcsp-9 (top view) in+ . gnd vo- vdd pvdd gnd in- shutdown vo+ a1 a2 a3 b1 b2 b 3 c1 c2 c3
AAT5101 2.5w mono filter-free class d audio power amplifier switchreg tm product datasheet 5101.2009.04.1.3 3 www.analogictech.com AAT5101 2.5w mono filter-free class d audio power amplifier switchreg tm product datasheet 5101.2009.04.1.3 3 www.analogictech.com absolute maximum ratings symbol description max units v dd supply voltage active mode 5.5 v shutdown mode 6.0 i out maximum output current 1.5 a t a operating ambient temperature -40 to +85 c t j maximum junction temperature 165 c latchup current @ t a = 85c > 200 ma recommended operating conditions symbol description min max units p vdd , v dd supply voltage 2.1 5.5 v t a operating temperature -40 85 c
AAT5101 2.5w mono filter-free class d audio power amplifier switchreg tm product datasheet 4 5101.2009.04.1.3 www.analogictech.com AAT5101 2.5w mono filter-free class d audio power amplifier switchreg tm product datasheet 4 5101.2009.04.1.3 www.analogictech.com electrical characteristics t a = 25c unless otherwise noted. symbol characteristic conditions min typ max units v dd operating supply voltage t a = -40c to +85c 2.1 5.5 v i q supply quiescent current v dd = 5.5v, no load 1.72 3.2 ma v dd = 3.6v, no load 1.35 v dd = 2.1v, no load 0.87 2.5 i sd shutdown current v dd = 2.1v to 5.5v 0.06 1 a v sdih shutdown voltage high v dd = 3.6v 2.0 v v sdil shutdown voltage low v dd = 3.6v 1.5 v f sw switching frequency v dd = 2.1v to 5.5v 200 250 300 khz g ampli er gain r l = 4 285k /r i 300k /r i 315k /r i v/v r ds static drain-source on-state resistance v dd = 5.5v 300 m v dd = 3.6v 350 v dd = 2.1v 500 r s resistance from shutdown to gnd 300 k t on turn on time v dd = 2.1v to 5.5v 8 ms t off turn off time v dd = 2.1v to 5.5v 8 ms operating characteristics t a = 25c, gain = 2v/v, r i = 150k unless otherwise noted. symbol characteristic conditions min typ max units p out output power thd+n = 10%, f = 1khz, r l = 4 v dd = 5.0v 2.80 w v dd = 3.6v 1.41 v dd = 2.5v 0.62 thd+n = 1%, f = 1khz, r l = 4 v dd = 5.0v 2.35 v dd = 3.6v 1.14 v dd = 2.5v 0.46 thd+n = 10%, f = 1khz, r l = 8 v dd = 5.0v 1.66 v dd = 3.6v 0.84 v dd = 2.5v 0.37 thd+n = 1%, f = 1khz, r l = 8 v dd = 5.0v 1.35 v dd = 3.6v 0.68 v dd = 2.5v 0.29 ef ciency r l = 8 , f = 1khz v dd = 5.0v, p out = 1.2w 92 % v dd = 3.6v, p out = 0.6w 91 r l = 4 ,f = 1khz v dd = 5.0v, p out = 2.0w 87 v dd = 3.6v, p out = 1.0w 85 thd+n total harmonic distortion + noise r l = 8 , f = 1khz v dd = 5.0v, p out = 1.0w 0.12 % r l = 8 , f = 1khz v dd = 3.6v, p out = 0.5w 0.21 r l = 8 , f = 1khz v dd = 2.5v, p out = 0.2w 0.26 snr signal-to noise ratio v dd = 5.0v, p out = 1.0w, r l = 8 91 db cmrr common mode rejection ratio v dd = 3.6v, v ic = 1vpp f = 217hz -63 db psrr power supply ripple rejection v dd = 3.6v, inputs ac-ground with c i = 2.2 f v ripple = 200mvpp, f = 217hz -60 db z i input impedance t a = 25c, gain = 2v/v, r l = 4 142 150 158 k
AAT5101 2.5w mono filter-free class d audio power amplifier switchreg tm product datasheet 5101.2009.04.1.3 5 www.analogictech.com AAT5101 2.5w mono filter-free class d audio power amplifier switchreg tm product datasheet 5101.2009.04.1.3 5 www.analogictech.com typical characteristics 1, 2 measurement input 30khz low pass filter AAT5101 measurement output power supply in+ in- + - vo+ vo- vdd gnd + - c i c i r i r i load 4. 7 f + - test set-up for typical characteristics graphs. 1. a 33 h inductor was placed in series with load resistor to emulate a small speaker for efficiency measurement. 2. the 30khz low-pass filter is required even if the analyzer has an internal low-pass filter. an rc low pass filter (100 , 47nf) is used on each output for the data sheet graphs.
AAT5101 2.5w mono filter-free class d audio power amplifier switchreg tm product datasheet 6 5101.2009.04.1.3 www.analogictech.com AAT5101 2.5w mono filter-free class d audio power amplifier switchreg tm product datasheet 6 5101.2009.04.1.3 www.analogictech.com typical characteristics efficiency vs. output power (f = 1khz; r l = 8 + 33h) output power (w) efficiency (%) 0 0.3 0.6 0.9 1.2 1.5 0 10 20 30 40 50 60 70 80 90 100 v dd = 5.0v v dd = 3.6v v dd = 2.5v v dd = 2.1v efficiency vs. output power (f = 1khz; r l = 4 + 33h) output power (w) efficiency (%) 0 0.5 1.0 1.5 2.0 2.5 0 10 20 30 40 50 60 70 80 90 v dd = 5.0v v dd = 3.6v v dd = 2.5v v dd = 2.1v supply current vs. output power (f = 1khz; r l = 8 + 33h) output power (w) supply current (ma) 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 0 50 100 150 200 250 300 350 v dd = 5.0v v dd = 3.6v v dd = 2.5v v dd = 2.1v supply current vs. output power (f = 1khz; r l = 4 + 33h) output power (w) supply current (ma) 0 0.5 1.0 1.5 2.0 2.5 0 100 200 300 400 500 600 v dd = 5.0v v dd = 3.6v v dd = 2.5v v dd = 2.1v supply voltage vs. quiescent current supply voltage (v) quiescent current (ma) 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 1 1.1 1.2 0.9 0.8 1.3 1.4 1.5 1.6 1.7 1.8 no load r l = 8 r l = 8 speaker
AAT5101 2.5w mono filter-free class d audio power amplifier switchreg tm product datasheet 5101.2009.04.1.3 7 www.analogictech.com AAT5101 2.5w mono filter-free class d audio power amplifier switchreg tm product datasheet 5101.2009.04.1.3 7 www.analogictech.com typical characteristics thd+n vs. output power (f = 1khz; r l = 8) output power (w) thd+n (%) 0.1 1 0.01 10 0.1 1 10 v dd = 5.0v v dd = 3.6v v dd = 2.5v v dd = 2.1v thd+n vs. output power (f = 1khz; r l = 4) output power (w) thd+n (%) 0.1 1 0.01 10 0.1 1 10 v dd = 5.0v v dd = 3.6v v dd = 2.5v v dd = 2.1v thd+n vs. frequency (c i = 2.2f; r l = 8) frequency (hz) thd+n (%) 10 100 1000 10000 100000 0.01 0.1 1 10 v dd = 5v, p out = 1w v dd = 3.6v, p out = 500mw v dd = 2.5v, p out = 200mw v dd = 2.1v, p out = 150mw thd+n vs. frequency (c i = 2.2f; r l = 4) frequency (hz) thd+n (%) 10 100 1000 10000 100000 0.01 0.1 1 10 v dd = 5.0v, p out = 1.5w v dd = 3.6v, p out = 800mw v dd = 2.5v, p out = 300mw v dd = 2.1v, p out = 200mw output power vs. supply voltage (f = 1khz; r l = 8) supply voltage (v) output power (w) 2.5 2.0 3.5 4.5 3.0 4.0 5.0 0.0 0.3 0.6 0.9 1.2 1.5 1.8 thd+n = 1% thd+n = 10% output power vs. supply voltage (f = 1khz; r l = 4) supply voltage (v) output power (w) 0.0 0.5 1.0 1.5 2.0 2.5 3.0 2.5 2.0 3.5 4.5 3.0 4.0 5.0 thd+n = 1% thd+n = 10%
AAT5101 2.5w mono filter-free class d audio power amplifier switchreg tm product datasheet 8 5101.2009.04.1.3 www.analogictech.com AAT5101 2.5w mono filter-free class d audio power amplifier switchreg tm product datasheet 8 5101.2009.04.1.3 www.analogictech.com typical characteristics psrr vs. frequency (v ripple = 200mvpp; c i = 2.2f; r l = 8; inputs ac-grounded) frequency (hz) psrr (db) 10 1000 100000 100 10000 -70 -65 -60 -55 -50 -45 -40 v dd = 5.0v v dd = 3.6v v dd = 2.5v v dd = 2.1v psrr vs. frequency (v ripple = 200mvpp; c i = 2.2f; r l = 4; inputs ac-grounded) frequency (hz) psrr (db) 10 1000 100000 100 10000 -70 -65 -60 -55 -50 -45 -40 v dd = 5.0v v dd = 3.6v v dd = 2.5v v dd = 2.1v cmrr vs. frequency (v dd = 3.6v; v ic = 200mvpp; r l = 8) frequency (hz) cmrr (db) 10 1000 100000 100 10000 -70 -65 -60 -55 -50 -45 -40
AAT5101 2.5w mono filter-free class d audio power amplifier switchreg tm product datasheet 5101.2009.04.1.3 9 www.analogictech.com AAT5101 2.5w mono filter-free class d audio power amplifier switchreg tm product datasheet 5101.2009.04.1.3 9 www.analogictech.com application information input resistor (r i ) selection the input resistors (r i ) set the gain of the amplifier according to the following equation: gain = 300k r i for input resistors (r i ), resistor matching is a very important criteria. the balance of the output around the reference voltage depends on a matched ratio of the resistors. cmrr and psrr diminish if resistor mismatch occurs. therefore, it is recommended to use 1% toler- ance resistors or better to keep the performance opti- mized. decoupling capacitor (c s ) selection the AAT5101 is a high-performance class-d audio ampli- fier that requires adequate power supply decoupling to ensure high efficiency and low total harmonic distortion (thd). for decoupling capacitor (c s ), a good low equiva- lent series resistance (esr) 4.7 f ceramic capacitor is preferred. input capacitor (c i ) selection the input capacitors and input resistors form a high-pass filter with the corner frequency, f c , determined by the following equation. the value of the input capacitor is an important consideration as it directly affects the bass (low frequency) performance of the circuit. speakers in wireless phones cannot usually respond well to low fre- quencies, so a high pass filter will be useful in this appli- cation. f c = 1 2 r i c i optional output filter the AAT5101 can be designed without an output filter if the traces from the amplifier to the speaker are short. however, to lower radiated emissions as much as possi- ble when used in filter-free mode, a ferrite bead filter can be used. if choosing a ferrite bead, choose one with high impedance at high frequencies, but very low imped- ance at low frequencies. the mpz1608s221a1 from tdk is a good choice. v o + v o - ferrite bead ferrite bead figure 1: optional emi ferrite bead filter.
AAT5101 2.5w mono filter-free class d audio power amplifier switchreg tm product datasheet 10 5101.2009.04.1.3 www.analogictech.com shutdown control r i r i differential input - + + - pwm h-bridge shutdown gnd v o + v o - in - in + r l c s to battery v dd figure 2: AAT5101 application schematic with dc-coupled fully differential input configuration. differential input - + pwm h-bridge shutdown control shutdown gnd in - in + c s to battery v dd r i r i c i c i v o + v o - r l figure 3: AAT5101 application schematic with ac-coupled fully differential input configuration.
AAT5101 2.5w mono filter-free class d audio power amplifier switchreg tm product datasheet 5101.2009.04.1.3 11 www.analogictech.com single -ended input - + pwm h- bridge shutdown control shutdown gnd v o + v o - in - in + to battery c s v dd r i r i c i c i r l figure 4: AAT5101 application schematic with single-ended input configuration. differential input 2 - + pwm h- bridge shutdown control shutdown gnd in - in + to battery + + - - r i1 r i1 r i2 r i2 differential input 1 c s v dd v o + r l v o - figure 5: AAT5101 application schematic with AAT5101 summing two differential inputs.
AAT5101 2.5w mono filter-free class d audio power amplifier switchreg tm product datasheet 12 5101.2009.04.1.3 www.analogictech.com single-ended input 2 - + pwm h-bridge shutdown control shutdown gnd in - in + to battery differential input 1 r i1 r i1 r i2 r i2 c i2 c i2 c s v dd v o + v o - r l figure 6: AAT5101 application schematic with AAT5101 summing differential input and single-ended input signals. - + pwm h- bridge shutdown control shutdown gnd in - in + to battery single-ended input 1 single-ended input 2 r i2 c i2 r p c p r i1 c i1 v o + v o - r l c s v dd figure 7: AAT5101 application schematic with AAT5101 summing two single-ended inputs.
AAT5101 2.5w mono filter-free class d audio power amplifier switchreg tm product datasheet 5101.2009.04.1.3 13 www.analogictech.com pcb guidance the suggested pcb layout for the AAT5101 is shown in figure 9. all components are placed as close as possible to the AAT5101's leads to achieve better performance. the following guidelines should be used to help ensure a proper layout. 1. the decoupling capacitor (c4) should connect to the vdd pin and pvdd pin as closely as possible. 2. the input resistor (r1, r2) should be placed very close to the AAT5101. 3. the input routes should be similar and the distance between the two routes should be small. 4. the output traces should be short, wide, and not pass beneath the ic in the other layers. wlcsp package light sensitivity the electrical performance of the wlcsp package can be adversely affected by exposing the device to certain light sources, such as direct sunlight or a halogen lamp whose wavelengths are red and infra-reds. however, fluores- cent lighting has very little effect on the electrical perfor- mance of the wlcsp package. evaluation board information r1 150k r2 150k c1 0.1f c2 0.1f c3 4.7 f c4 vdd in+ in- vo - vo+ sd vdd AAT5101 u1 vdd shutdown audio in pvdd gnd 1 2 3 j1 1 2 j4 in- in+ out+ out- audio out gnd gnd gnd figure 8: AAT5101 evaluation board schematic. component selection item part description ref pcb footprint manufacturer part number 1 smd resistor 150k r1, r2 0603 vishay-draloric crcw0603 2 ceramic capacitor 0.1 f, 50v, x7r c1, c2 0603 tdk c1608x7r1h104kt 3 ceramic capacitor 4.7 f, 6.3v, x5r c4 0603 tdk c1608x5r0j475mt 4 not populated c3
AAT5101 2.5w mono filter-free class d audio power amplifier switchreg tm product datasheet 14 5101.2009.04.1.3 www.analogictech.com AAT5101 2.5w mono filter-free class d audio power amplifier switchreg tm product datasheet 14 5101.2009.04.1.3 www.analogictech.com (a) top layer (b) ground plane (c) power plane (d) bottom layer figure 9: AAT5101 evaluation board pcb layout.
AAT5101 2.5w mono filter-free class d audio power amplifier switchreg tm product datasheet 5101.2009.04.1.3 15 www.analogictech.com AAT5101 2.5w mono filter-free class d audio power amplifier switchreg tm product datasheet 5101.2009.04.1.3 15 www.analogictech.com advanced analogic technologies, inc. 3230 scott boulevard, santa clara, ca 95054 phone (408) 737-4600 fax (408) 737-4611 ? advanced analogic technologies, inc. analogictech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an analogictech pr oduct. no circuit patent licenses, copyrights, mask work rights, or other intellectual property rights are implied. analogictech reserves the right to make changes to their products or speci cations or to discontinue any product or service without notice. except as provided in analogictech?s terms and conditions of sale, analogictech assumes no liability whatsoever, and analogictech disclaims any express or implied warranty re lating to the sale and/or use of analogictech products including liability or warranties relating to tness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right . in order to minimize risks associated with the customer?s applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. testing and other quality control techniques are utilized to the extent analogictech deems necessary to support this warranty. speci c testing of all parameters of each device is not necessarily performed. analogictech and the analogictech logo are trademarks of advanced analogic technologies incorporated. all other brand and product names appearing in this document are registered trademarks or trademarks of their respective holders. ordering information package part marking 1 part number (tape and reel) 2 wlcsp-9 7hyw AAT5101iur-t1 all analogictech products are offered in pb-free packaging. the term pb-free means semiconductor products that are in compliance with current rohs standards, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. for more information, please visit our website at http://www.analogictech.com/about/quality.aspx. packaging information wlcsp-9 1.420 all dimensions in millimeters. 1. yw = date code. 2. sample stock is generally held on part numbers listed in bold .

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