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SGM4895 1.3w fully differential audio power amplifier general description the SGM4895 is a fully differential audio power amplifier that is designed for portable communication device applications and demanding applications in mobile phones. it is capable of delivering 1.3w of continuous average power into an 8 ? load with typically 1% distortion (thd+n) from a 5v battery voltage. it operates from 2.5v to 5.5v power supply. the SGM4895 features a low power consumption shutdown mode. to facilitate this, shutdown may be enabled by logic low. additionally, the SGM4895 features an internal thermal shutdown protection mechanism. the SGM4895 contains advanced pop/click circuitry, with a minimal amount of external components. all these features make SGM4895 ideal for wireless handsets and other low voltage applications where minimal power consumption is a primary requirement. the SGM4895 is available in green tdfn-33-8l and msop-8 (exposed pad) packages. it operates over an ambient temperature range of -40 to +85 . features ? fully differential amplifier ? excellent psrr: direct connection to battery ? 1.3w into 8 ? load from 5v supply at thd+n = 1% (typ) ? 1.6w into 4 ? load from 5v supply at thd+n = 1% (typ, SGM4895ydb8 only) ? 2.5v to 5.5v operation ? low shutdown current ? improved pop/click circuitry ? support single-ended or differential input ? thermal overload protection circuitry ? no output coupling capacitors, bootstrap capacitors required ? external gain configuration capability ? -40 to +85 operating temperature range ? green tdfn-33-8l and msop-8 (exposed pad) packages applications portable systems wireless handsets mobile phone handheld computers pdas gps re v . c. 1 sg micro corp www.sg-micro.com
1.3w fully differential SGM4895 audio power amplifier 2 sg micro corp www.sg-micro.com package/ordering information model order number package description package option marking information SGM4895ydb8/tr tdfn-33-8l tape and reel, 3000 SGM4895db SGM4895 SGM4895ypms8/tr msop-8 (exposed pad) tape and reel, 3000 SGM4895ypms8 absolute maximum ratings supply voltage????????????????????6v input voltage............. .................. ................ ..-0.3v to (v + ) + 0.3v storage temperature range ???.????..-65 to +150 junction temperature???????????????..150 operating temperature range???????...-40 to +85 lead temperature range (soldering 10 sec) ?????????????????????????.260 esd susceptibility hbm?????????????????????.??2000v mm????????????????????????400v note: stresses beyond those listed under ?absolute maximum ratings? may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the s pecifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. caution this integrated circuit can be damaged by esd if you don?t pay attention to esd protection. sgmicro recommends that all integrated circuits be handled with appropriate precautions. failure to observe proper handling and installation procedures can cause damage. esd damage can range from subtle performance degradation to complete device failure. precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications. sgmicro reserves the right to make any change in circuit design, specification or other related things if necessary without notice at any time. please contact sgmicro sales office to get the latest datasheet. pin configurations (top view) 1 4 3 2 8 5 6 7 SGM4895ydb8 bypass in 2 shdn in 1 v o1 v o2 v + gnd tdfn-33-8l gnd 1 4 3 2 8 5 6 7 SGM4895ypms8 bypass in 2 shdn in 1 v o1 v o2 v + gnd msop-8 (exposed pad) gnd
1.3w fully differential SGM4895 audio power amplifier 3 sg micro corp www.sg-micro.com electrical characteristics (the following ac specifications apply for 8 ? load, a v = 1v/v, t a = +25 , unless otherwise specified.) parameter symbol conditions min typ max units supply voltage v + 2.5 5.5 v shutdown current i sd v in = 0v, v shdn = gnd 0.01 1 a v in = 0v, v shdn = v + = 5.0v -10 2.5 10 v in = 0v, v shdn = v + = 3.3v -10 2.0 10 output offset voltage v os v in = 0v, v shdn = v + = 2.6v 2.0 mv v + = 5.0v, no load 4.70 7.50 v + = 5.0v, 8 ? load 4.75 8.00 v + = 3.3v, no load 3.87 5.80 v + = 3.3v, 8 ? load 3.90 6.00 v + = 2.6v, no load 3.20 quiescent power supply current i q v in = 0v, i o = 0a, v shdn = v + v + = 2.6v, 8 ? load 3.22 ma shutdown voltage input high v sdih 1.2 shutdown voltage input low v sdil 0.4 v v + = 5.0v 1.30 v + = 3.6v 0.65 v + = 3.0v 0.45 f = 1khz thd+n = 1% v + = 2.6v 0.34 v + = 5.0v 1.60 v + = 3.6v 0.82 v + = 3.0v 0.55 output power (8 ? ) p o f = 1khz thd+n = 10% v + = 2.6v 0.42 w v + = 5.0v 1.60 v + = 3.6v 1.00 v + = 3.0v 0.65 f = 1khz thd+n = 1% SGM4895ydb8 only v + = 2.6v 0.50 v + = 5.0v 2.20 v + = 3.6v 1.25 v + = 3.0v 0.85 output power (4 ? ) p o f = 1khz thd+n = 10% SGM4895ydb8 only v + = 2.6v 0.60 w total harmonic distortion + noise thd+n p o = 0.6wrms, f = 1khz, v + = 5.0v 0.015 % v + = 5.0v -83 v + = 3.6v -80 v + = 3.0v -73 f = 217hz v + = 2.6v -65 v + = 5.0v -83 v + = 3.6v -80 v + = 3.0v -73 power supply rejection ratio (1) (2) psrr f = 1khz v + = 2.6v -65 db common mode rejection ratio (2) cmrr f = 217hz, v cm = 200mv p-p , v + = 5.0v -76 db v + = 5.0v 50 v + = 3.6v 42 v + = 3.0v 37 wake-up time t wu c b = 1 f v + = 2.6v 32 ms notes: 1. 10 ? terminated input. 2. psrr and cmrr are affected by the matching between gain-setting resistor ratios.
1.3w fully differential SGM4895 audio power amplifier 4 sg micro corp www.sg-micro.com typical performance characteristics at t a = +25 , a v = 1, f = 1khz, c b = 1f, unless otherwise noted. thd+n vs. output power 0.001 0.01 0.1 1 10 0.01 0.1 1 10 output power (w) thd+n (%) v + = 5.0v r l = 8 ? bw < 80khz thd+n vs. output power 0.001 0.01 0.1 1 10 0.01 0.1 1 output power (w) thd+n (%) v + = 3.0v r l = 8 ? bw < 80khz power dissipation vs. output power 0 0.2 0.4 0.6 0.8 0 0.2 0.4 0.6 0.8 1 1.2 1.4 output power (w) power dissipation (w) v + = 5.0v r l = 8 ? bw < 80khz thd+n 1% thd+n vs. output power 0.001 0.01 0.1 1 10 0.01 0.1 1 10 output power (w) thd+n (%) v + = 3.6v r l = 8 ? bw < 80khz thd+n vs. output power 0.001 0.01 0.1 1 10 0.01 0.1 1 output power (w) thd+n (%) v + = 2.6v r l = 8 ? bw < 80khz power dissipation vs. output power 0 0.1 0.2 0.3 0.4 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 output power (w) power dissipation (w) v + = 3.6v r l = 8 ? bw < 80khz thd+n 1%
1.3w fully differential SGM4895 audio power amplifier 5 sg micro corp www.sg-micro.com typical performance characteristics at t a = +25 , a v = 1, f = 1khz, c b = 1f, unless otherwise noted. power dissipation vs. output power 0 0.1 0.2 0.3 0 0.1 0.2 0.3 0.4 0.5 0.6 output power (w) power dissipation (w) v + = 3.0v r l = 8 ? bw < 80khz thd+n 1% power supply rejection ratio vs. frequency -120 -100 -80 -60 -40 0.01 0.1 1 10 100 frequency (khz) psrr (db) v + = 5.0v, r l = 8 ? input 10 ? terminated 200mv p-p common mode rejection ratio vs. frequency -120 -100 -80 -60 -40 -20 0.01 0.1 1 10 100 frequency (khz) cmrr (db) v + = 5.0v, r l = 8 ? input 10 ? terminated 200mv p-p power dissipation vs. output power 0 0.05 0.1 0.15 0.2 0 0.1 0.2 0.3 0.4 0.5 output power (w) power dissipation (w) v + = 2.6v r l = 8 ? bw < 80khz thd+n 1% power supply rejection ratio vs. frequency -120 -100 -80 -60 -40 0.01 0.1 1 10 100 frequency (khz) psrr (db) v + = 3.0v, r l = 8 ? input 10 ? terminated 200mv p-p thd+n vs. frequency 0.001 0.01 0.1 1 0.01 0.1 1 10 100 frequency (khz) thd+n (%) v + = 5.0v, r l = 8 ? p o = 600mw no filters
1.3w fully differential SGM4895 audio power amplifier 6 sg micro corp www.sg-micro.com typical performance characteristics at t a = +25 , a v = 1, f = 1khz, c b = 1f, unless otherwise noted. clipping (dropout) voltage vs. supply voltage 0 0.1 0.2 0.3 0.4 0.5 2.5 3 3.5 4 4.5 5 5.5 supply voltage (v) dropout voltage (v) bottom top r l = 8 ? output power vs. supply voltage 0 0.5 1 1.5 2 2.5 2.5 3 3.5 4 4.5 5 5.5 supply voltage (v) output power (w) r l = 4 ? thd+n = 10% thd+n = 1% output power vs. supply voltage 0 0.5 1 1.5 2 2.5 2.5 3 3.5 4 4.5 5 5.5 supply voltage (v) output power (w) r l = 8 ? thd+n = 10% thd+n = 1% power dissipation vs. output power 0.4 0.6 0.8 1 1.2 1.4 1.6 00.511.52 output power (w) power dissipation (w) v + = 5.0v r l = 4 ? bw < 80khz thd+n 1%
1.3w fully differential SGM4895 audio power amplifier 7 sg micro corp www.sg-micro.com typical applications _ + _ + bias circuitry differential audio input r l = 8 shdn bypass in 2 r i 20k c i 0.39f c b 1f (optional) r i 20k c i 0.39f v o2 v o1 to battery c s 1f v + gnd v + /2 in 1 v ih v il r f 20k r f 20k 10k to external power supply or control i/o note: a 10k ? resistor must be serially connected to shdn pin. figure 1. typical differential input application schematic
1.3w fully differential SGM4895 audio power amplifier 8 sg micro corp www.sg-micro.com typical applications _ + _ + bias circuitry audio input r l = 8 shdn bypass in 2 r i 20k c i 0.39f c b 1f (optional) r i 20k c i 0.39f v o2 v o1 to battery c s 1f v + gnd v + /2 in 1 v ih v il r f 20k r f 20k 10k to external power supply or control i/o note: a 10k ? resistor must be serially connected to shdn pin. figure 2. single-ended input application schematic
1.3w fully differential SGM4895 audio power amplifier 9 sg micro corp www.sg-micro.com application notes pcb design recommendations (t hermal design considerations) with proper thermal design considerations, SGM4895ydb8 is capable of delivering 1.6w of continuous average power into a 4 ? load at 5v power supply. thermal land the tdfn-33-8l thermal land is a metal (normally copper) region centrally located under the package and on top of the pcb. it has a rectangular or square shape and should match the dimensions of the exposed pad on the bottom of the package (1:1 ratio). for certain high power applications, the pcb land may be modified to a "dog bone" shape that enhances thermal performance. the packages used with the "dog bone" lands will be a dual inline configuration (see figure 3). figure 3. dog bone thermal vias thermal vias are necessary. they conduct heat from the exposed pad of the package to the ground plane. the number of vias is application specific and is dependent upon electrical requirements and power dissipation. the via diameter should be 0.2mm to 0.33mm with 1oz. copper via barrel plating. it is important to plug the via to avoid any solder wicking inside the via during the soldering process. the thermal vias can be tented with solder mask on the top surface of the pcb. the solder mask diameter should be at least 75microns (or 3mils) larger than the via diameter. the solder mask thickness should be the same across the entire pcb. a package thermal performance may be improved by increasing the number of vias.
1.3w fully differential SGM4895 audio power amplifier 10 sg micro corp www.sg-micro.com package outline dimensions tdfn-33-8l e d e l b k a a2 a1 top view bottom view side view e1 d1 n1 n4 n8 0.65 2.725 0.24 0.675 1.5 2.3 recommended land pattern (unit: mm) dimensions in millimeters dimensions in inches symbol min max min max a 0.700 0.800 0.028 0.031 a1 0.000 0.050 0.000 0.002 a2 0.203 ref 0.008 ref d 2.900 3.100 0.114 0.122 d1 2.200 2.400 0.087 0.094 e 2.900 3.100 0.114 0.122 e1 1.400 1.600 0.055 0.063 k 0.200 min 0.008 min b 0.180 0.300 0.007 0.012 e 0.650 typ 0.026 typ l 0.375 0.575 0.015 0.023
1.3w fully differential SGM4895 audio power amplifier 11 sg micro corp www.sg-micro.com package outline dimensions msop-8 (exposed pad) e1 e e b e2 d1 c l d a1 a a2 recommended land pattern (unit: mm) 1.02 0.41 0.65 4.8 1.80 1.55 dimensions in millimeters dimensions in inches symbol min max min max a 0.820 1.100 0.032 0.043 a1 0.020 0.150 0.001 0.006 a2 0.750 0.950 0.030 0.037 b 0.250 0.380 0.010 0.015 c 0.090 0.230 0.004 0.009 d 2.900 3.100 0.114 0.122 d1 1.700 1.900 0.067 0.075 e 0.65 bsc 0.026 bsc e 2.900 3.100 0.114 0.122 e1 4.750 5.050 0.187 0.199 e2 1.450 1.650 0.057 0.065 l 0.400 0.800 0.016 0.031 0 6 0 6
1.3w fully differential SGM4895 audio power amplifier 12 sg micro corp www.sg-micro.com tape and reel information note: the picture is only for reference. please make the object as the standard. key parameter list of tape and reel package type reel diameter reel width w1 (mm) a0 (mm) b0 (mm) k0 (mm) p0 (mm) p1 (mm) p2 (mm) w (mm) pin1 quadrant msop-8 (exposed pad) 13 12.4 5.2 3.3 1.5 4.0 8.0 2.0 12.0 q1 tdfn-33-8l 13 12.4 3.35 3.35 1.13 4.00 8.00 2.00 12.00 q1 reel width (w1) reel diameter reel dimensions tape dimensions direction of feed p2 p0 w p1 a0 k0 b0 q1 q2 q4 q3 q3 q4 q2 q1 q3 q4 q2 q1
1.3w fully differential SGM4895 audio power amplifier 13 sg micro corp www.sg-micro.com carton box dimensions note: the picture is only for reference. please make the object as the standard. key parameter list of carton box reel type length (mm) width (mm) height (mm) pizza/carton 13 386 280 370 5

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