Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw 2W × 2 Class AB Audio Power Amplifier PT2303 DESCRIPTION The PT2303 is a power amplifier utilizing CMOS Technology specially designed for audio purpose. It can deliver 2W × 2 power output to the 5V power voltage. The power consumption is very low in stand-by. Total harmonic distortion is lower than 0.03%. The output mode can be switched between the SE (Single-Ended) or BTL (Bridge-Tied Load) mode. Built-in over-temperature protection, package size is not occupies PCB space. It is suitable for small or portable products. FEATURES • • • • • • • • CMOS Technology Stereo input Output power 2W × 2 (4Ω) Low harmonics distortion (0.03%) SE and BTL modes operation Suppress the pop and click noise when mode changed Shutdown function, turn on can into save mode (Icc<0.5µA) Built-in overheat protect APPLICATIONS • • • • LCD monitor (for TV) Portable audio Multimedia speakers Other audio applications PT2303 V1.2 -1- December, 2007 Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw 2W × 2 Class AB Audio Power Amplifier PT2303 BLOCK DIAGRAM -I N 1 +I N 1 Shutdown VDD AMP1N -OUT1 + Power Block AMP1P Vref + +OUT1 GND SE/BTL -I N 2 +I N 2 HP-IN AMP2N -OUT2 + AMP2P PT2303 V1.2 -2- + +OUT2 December, 2007 Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw 2W × 2 Class AB Audio Power Amplifier PT2303 PIN CONFIGURATION Shutdown GND +OUT 1 VDD -OUT1 1 2 3 4 5 -IN 1 GND +I N 1 6 7 8 P T 2303 16 15 14 13 12 11 10 9 HP-IN GND +OUT 2 VDD -OUT2 Shutdown GND +OUT 1 VDD -OUT1 -IN 2 Vref +I N 2 -IN 1 GND +I N 1 NC NC 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 P T 2303 15 14 13 12 11 HP-IN GND +OUT 2 VDD -OUT2 -IN 2 Vref +I N 2 NC NC PIN DESCRIPTION Pin Name I/O Shutdown I GND +OUT1 VDD -OUT1 -IN1 GND +IN1 +IN2 Vref -IN2 -OUT2 VDD +OUT2 GND O O I I I I I O O - HP-IN I NC - PT2303 V1.2 Description Shutdown pin。Entire IC into the shutdown mode when this pin connected to the Vcc. Ground Channel 1 output (+) Supply voltage input Channel 1 output (-) Channel 1 input (-) Ground Channel 1 input (+) Channel 2 input (+) Bias reference bypassing Channel 2 input (-) Channel 2 output (-) Supply voltage input Channel 2 output (+) Ground Output mode select, connected to the VDD for SE mode or GND for BTL mode No Connect -3- Pin No. 16 Pins 20 Pins 1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 2 3 4 5 6 7 8 13 14 15 16 17 18 19 16 20 - 9 ~ 12 December, 2007 Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw 2W × 2 Class AB Audio Power Amplifier PT2303 FUNCTION DESCRIPTION POWER SUPPLY The operating voltage of PT2303 is from 3V to 5V, In general operation 5V is recommended, it can deliver higher power output. When the supply voltage less then 3V the IC can work properly, but the distortion will rise. After the supply voltage exceed 6V the temperature of package outside will rising quickly due to higher stand-by current consumption. SHUTDOWN When the supply still powered the chip, pull-up the shutdown pin to VDD level will take chip into the shutdown mode. After the shutdown mode is active, the total current consumption is less than 0.5µA and the all of input or output pins no voltage output. When shutdown pin set to GND, the IC is back to the normal operation. Shutdown Pin VDD GND Output State Shutdown ON Normal VOLTAGE GAIN ADJUST The output stage structure of the PT2303 is Bridge Tied Loaded (BTL), the close loop voltage gain can be get from following formula. Gain = 20log ( Rf ÷ Ri ) + 6dB The close loop gain can be adjusted by external resistance, in general purpose the 6dB gain setting is recommended, please reference to the application circuit. If the amplitude of input voltage in lower level (ex. < 2Vpp), it can raise the voltage gain to get enough power output. Recommended of the minimum series resistance (Ri) is 10KΩ to ensure IC have appropriate input impedance. Please refer to following table. External Resistance Ri Rf PT2303 V1.2 Gain= 0dB 20KΩ 10KΩ -4- Gain= 6dB 20KΩ 20KΩ Gain=12dB 10KΩ 20KΩ December, 2007 Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw 2W × 2 Class AB Audio Power Amplifier PT2303 If the amplitude of input signal exceed the VDD-GND range, or voltage gain setup too high, the input stage is very easy overload and distorted. Please make sure the amplitude of audio source (Vin) and setting the best gain value, in general use the gain setup to +6dB is recommended. Please refer to following table. Operating Voltage VDD=3V VDD=5V Gain= 0dB Vin <5Vpp Vin <8Vpp Gain= 6dB Vin <2.5Vpp Vin<4Vpp Gain=12dB Vin <1.25Vpp Vin<2Vpp SE/BTL MODE SWITCHING PT2303 have two output modes, SE (Single-Ended) or BTL (Bridge-Tied Load). When driving a 4Ω speaker load suggestion set to the BTL mode for get the more power output. And driving a 32Ω headphone load, it can be set to SE mode and turn-off the un-work amplifier to decrease stand-by power consumption. Switching between the SE/BTL modes is controlled by the HP-IN pin, please refer to following table: HP-IN VDD GND Output Mode SE BTL OVER TEMPERATURE PROTECTION The PT2303 has a built-in over temperature protection circuit, it will turn off all output when the chip temperature over 130℃, the chip will return to normal operation automatically after the temperature cool down to 100℃. POP AND CLICK SURPRESS A power amplifier uses single supply voltage may almost have inrush noise on output in the power-on/off period. It is because of the output DC potential needs time to stable on 1/2VDD, the period relative with the capacitance (CB) on the Vref pin. Larger CB value will extend the stable time, and also can suppress the noise happened in power-on. In supply voltage=5V and CB=2.2µF, stable time is about 300mS. The value of CB also relative with the value of the DC blocking capacitor connected in input terminal. In general condition the time constant of DC blocking capacitor should be less than CB stable time. The recommended value of DC blocking capacitor is 1µF, and the capacitor of output terminal connected to 32Ω headphone is 220µF. Smaller capacitance can shorten the charge time to suppress the pop noise, both the input and output capacitance will limited the low frequency extend range. PT2303 V1.2 -5- December, 2007 Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw 2W × 2 Class AB Audio Power Amplifier PT2303 HEAT DISSIPATION During normal operation, the chip only consumes very little stand-by current. In high output power conditions, the package temperature will rise. For proper operating temperature, a modest heat sink mounted on the top side of the chip is required. The thermal resistance requirement of the heat sink demand may be obtained by the formula below: θJA = (TJ (max) - TA)/PDISS PDISS = IC dissipation power TJ (max) = Maximum chip conjunction temperature TA = external environment temperature θJA = thermal resistance from chip conjunction to ambience environment With 60% estimated efficiency (eff), PT2303 in 2W + 2W output power dissipation is probably PDISS = ( Po ÷ eff ) - Po = 2.6W The maximum chip conjunction temperature is 150℃, Exceed this temperature will damage the chip, assuming the outside environment air temperature is 50℃. From the chip conjunction dissipation to external environment thermal resistance θJA should be: θJA = ( 150 – 50 ) ÷ 2.6 = 38.4℃/W The PT2303 chip conjunction to case thermal resistance θJC is 26℃ /W. Therefore the heat sink thermal resistance should be: θJA - θJC = 12.4℃/W In normal operating, PT2303 needs at least 2 sq inch PCB for heat dissipate; it should be use whole copper foil to cover on it for enough heat dissipation space. We suggest using two-layer PCB for better heat dissipation. The track connected to the output and power pin of IC should be as thick as possible for better heat dissipation ability. If IC doesn’t have enough heat dissipation space (>1 sq inch), and IC is always in full power output situation, an additional heat sink should placed on the chip. PT2303 V1.2 -6- December, 2007 Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw 2W × 2 Class AB Audio Power Amplifier PT2303 ABSOLUTE MAXIMUM RATINGS Parameter Supply voltage Operating temperature Storage temperature Maximum input voltage Maximum input current Symbol VDD Tamb Tstg Vimax Iimax Condition * Min. 0 -40 -65 -0.3 -10 Max. 7 +85 +150 Vcc+0.3 +10 Unit V ℃ ℃ V mA *Input pins surge current can be reached 100mA will not induce the CMOS latched up. PACKAGE THERMAL CHARACTERISTICS PACKAGE TYPE: SOP16L, 300MIL Parameter From chip conjunction dissipation to external environment From chip conjunction dissipation to package surface PT2303 V1.2 -7- Symbol θJA θJC Condition Ta=25℃ Value 88.8 26 Unit ℃/W ℃/W December, 2007 Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw 2W × 2 Class AB Audio Power Amplifier PT2303 ELECTRICAL CHARACTERISTICS (Unless otherwise specified, VDD=5V, bandwidth=22~22KHz) Parameter Supply voltage Operating current Symbol VDD Is Two channels gain error Gerr THD+N THD Power output Signal-to-Noise Residual noise Output offset Channel separation Power Signal-to-Noise repel rate Temperature protect Po SNR Vno Voff CS PSRR TH Shutdown voltage VSD SE/BTL voltage VSB PT2303 V1.2 Condition SE Mode BTL Mode Shutdown=ON Ri=Rf=20KΩ Po=0.2W, RL=4Ω Po=1W, RL=4Ω Po=50mW, RL=32Ω THD=1%, RL=8Ω THD=10%, RL=8Ω BTL THD=1%, RL=4Ω THD=10%, RL=4Ω THD=1%, RL=32Ω SE THD=10%, RL=32Ω A-Weighted A-weighted +OUT ~ -OUT BTL F=1KHz SE BTL F=100Hz SE Overheat close Back to work VDD=3~5V Shutdown ON Shutdown pin Shutdown OFF SE VDD=3~5V BTL -8- Min. 3 4 6 0.1 -1 0.03 0.06 0.03 1.0 1.2 1.4 1.8 80 100 95 2 80 80 60 40 85 0.45 0.75 - Typ. 5 6 8 0.5 0 0.05 0.08 0.05 1.1 1.4 1.6 2.0 85 110 100 35 10 90 85 70 45 130 100 0.6 0.15 0.8 0.2 Max. 6 10 12 1 +1 0.07 0.15 0.08 1.2 1.6 1.8 2.1 90 120 50 30 100 95 80 50 140 0.2 0.3 Unit V mA µA dB % W mW dB µV mV dB dB ℃ VDD VDD December, 2007 Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw 2W × 2 Class AB Audio Power Amplifier PT2303 APPLICATION CIRCUIT CH1 IN VDD Ri 1uF 20k ON OFF ShutDown VDD CVDD 10uF CH2 IN Rf 20k 6 -IN1 8 +IN1 1 Shut Down 4,13 VDD 10 CB 1uF 1uF Ri 20k -OUT1 AMP1N POWER BLOCK AMP1P +OUT1 3 HP-IN 16 GND 11 -IN2 -OUT2 12 9 +IN2 BTL/SE Sense VDD 100k Vref 2,7,15 220uF 1k SE/BTL AMP2N 100k 220uF Rf 20k AMP2P PT2303 V1.2 5 -9- +OUT2 HEADPHONE 1k 14 December, 2007 Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw 2W × 2 Class AB Audio Power Amplifier PT2303 ORDER INFORMATION Valid Part Number PT2303-D PT2303-S PT2303-TX PT2303 V1.2 Package Type 16 Pins, DIP, 300mil 16 Pins, SOP, 300mil 20 Pins, TSSOP - 10 - Top Code PT2303-D PT2303-S PT2303-TX December, 2007 Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw 2W × 2 Class AB Audio Power Amplifier PT2303 PACKAGE INOFRMATION 16PINS, DIP, 300MIL PT2303 V1.2 - 11 - December, 2007 Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw 2W × 2 Class AB Audio Power Amplifier Symbol A A1 A2 b b1 b2 b3 c c1 D D1 E E1 e eA eB eC L Min. 0.015 0.115 0.014 0.014 0.045 0.030 0.008 0.008 0.780 0.005 0.300 0.240 0.000 0.115 PT2303 Nom. 0.130 0.018 0.018 0.060 0.039 0.010 0.010 0.790 0.310 0.250 0.100 bsc 0.300 bsc 0.130 Max. 0.210 0.195 0.022 0.020 0.070 0.045 0.014 0.011 0.800 0.325 0.280 0.430 0.060 0.150 Notes: 1. Controlling Dimension: INCHES. 2. Dimensioning and tolerancing per ANSI Y14.5M-1982. 3. Dimensions A, A1 and L are measured with the package seated in JEDEC Seating Plane Gauge GS-3. 4. D, D1 and E1 dimensions do not include mold flash or protrusions. Mold flash or protrusions shall not exceed 0.010 inch. 5. E and eAmeasured with the leads constrained to be perpendicular to datum -C-. 6. eB and eA are measured at the lead tips with the leads unconstrained. 7. N is the maximum number of terminal positions (N=16). 8. Pointed or rounded lead tips are preferred to ease insertion. 9. b2 and b3 maximum dimensions do not include dambar protrusions. Dambar protrusions shall not exceed 0.010 (0.25mm). 10. Variation AB is a full lead package. 11. Distance between leads including dambar protrusions to be 0.005 in minimum. 12. Datum plane -H- coincident with the bottom of lead where lead exits body. 13. Refer to JEDEC MS-001 Variation AB. JEDEC is the registered trademark of JEDEC SOLID STATE TECHNOLOGY ASSOCIATION. PT2303 V1.2 - 12 - December, 2007 Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw 2W × 2 Class AB Audio Power Amplifier PT2303 16 PINS, SOP, 300 MIL PT2303 V1.2 - 13 - December, 2007 Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw 2W × 2 Class AB Audio Power Amplifier Symbol A A1 B C D E e H h L α PT2303 Min. Max 2.35 2.65 0.10 0.30 0.33 0.51 0.23 0.32 10.10 10.50 7.40 7.60 1.27 BSC 10.00 10.65 0.25 0.75 0.40 1.27 0o 8o Notes: 1. Controlling Dimension: MILLIMETER 2. Dimensioning and tolerancing per ANSI Y14.5M-1982. 3. Dimension D does not include mold flash, protrusions or gate burrs. Mold flash, protrusions and gate burrs shall not exceed 0.15mm (0.006 in) per side. 4. Dimension E does not include interlead flash or protrusions. Interlead flash and protrusions shall not exceed 0.25 mm (0.010 in.) per side. 5. The chamfer on the body is optional. If it is not present, a visual index feature must be located within the crosshatched area. 6. L is the length of the terminal for soldering to a substrate. 7. N is the number of terminal positions (N=16). 8. The lead width B, as measured 0.36 mm (0.014in) or greater above the seating plane, shall not exceed a maximum value of 0.61mm (0.024in.) 9. Refer to JEDEC MS-013 Variation AA. JEDEC is the registered trademark of JEDEC SOLID STATE TECHNOLOGY ASSOCIATION. PT2303 V1.2 - 14 - December, 2007 Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw 2W × 2 Class AB Audio Power Amplifier PT2303 20PINS, TSSOP, 173MIL PT2303 V1.2 - 15 - December, 2007 Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw 2W × 2 Class AB Audio Power Amplifier Symbols A A1 A2 b b1 c c1 D E E1 e L L1 R R1 S θ1 θ2 θ3 PT2303 V1.2 Min 0.05 0.80 0.19 0.19 0.09 0.09 6.40 PT2303 Nom 1.00 0.22 6.50 6.40 BSC. 4.40 0.65 BSC. 0.60 1.00 REF. 12 REF. 12 REF. 4.30 0.45 0.09 0.09 0.20 0° - 16 - Max 1.20 0.15 1.05 0.30 0.25 0.20 0.16 6.60 4.50 0.75 8° December, 2007 Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw 2W × 2 Class AB Audio Power Amplifier PT2303 Notes: 1. Dimensioning and tolerancing per ASME Y14.5M-1994. 2. Controlling Dimension: Millimeters 3. Dimension D does not include mold flash, protrusions or gate burrs. Mold flash, protrusions or gate burrs shall not exceed 0.15 per end. 4. Dimension E1 does not include interlead flash or protrusion. Interlead flash or protrusion shall not exceed 0.25 per side. 5. Dimension b does not include dambar protrusion. Allowable dambar protrusion shall be 0.08 mm total in excess of the b dimension at maximum material condition. Dambar cannot be located on the lower radius or the foot. Minimum space between protrusion and adjacent lead is 0.07 mm. 6. N is the maximum number of terminal positions for the specified package length. Depopulation is allowed, but only under the following conditions: - Depopulation may reduce N by increments of four leads only. - Only end leads may be removed. - Leads must be symmetrically arranged with respect to datum A (Note 10) to avoid any array shifting. 7. Terminal numbers are shown for reference only. 8. Datum A and B to be determined at datum plane H. 9. Dimensions D and E1 to be determined at datum plane H. 10. This dimension applies only to variations with an even number of leads per side. For variations with an odd number of leads per side, the center lead must be coincident with the package centerline, datum A. 11. Cross section B-B to be determined at 0.10 to 0.25 mm from the lead tip. 12. Details of the pin 1 identifier are optional, but must be located within the zone indicated. 13. D1 and E2 minimum dimensions of thermally enhanced types are variables depending on device function (die paddle size). D1 and E2 maximum dimensions can be equal to D/E1 maximum dimensions. End user should verify actual size of exposed thermal pad for specific device application. 14. A1 is defined as the vertical distance from the seating plane to the lowest point on the package body excluding the lid and or thermal enhancement on cavity down package configurations. 15. Caution should be taken during design, assembly and processing to prevent deposited board solder from holding the leads up off the board. This is applicable to thermal enhanced variations where A1 dimension is allowed to be zero. 16. Refer to JEDEC MO-153 Variation AC JEDEC is the trademark of JEDEC SOLID STATE TECHNOLOGY ASSOCIATION PT2303 V1.2 - 17 - December, 2007