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MAX9730 Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX9730 Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 15 page 2.4W, Single-Supply, Class G Power Amplifier _______________________________________________________________________________________ 7 ON IN1 IN1 P N1 N2 IP ON OFF RL VCC SVSS LOW SUPPLY RANGE OPERATION IP = IN1 ON IN2 IN2 P N1 N2 IP ON ON RL VCC BTL CLASS G SUPPLY TRANSITION SVSS SUPPLY TRANSITION IP = IN1 + IN2 ON P N1 N2 IP OFF ON RL VCC SVSS HIGH SUPPLY RANGE OPERATION IP = IN2 Detailed Description The MAX9730 Class G power amplifier with inverting charge pump is the latest in linear amplifier technolo- gy. The Class G output stage offers the performance of a Class AB amplifier while increasing efficiency to extend battery life. The integrated inverting charge pump generates a negative supply capable of deliver- ing up to 500mA. The Class G output stage and the inverting charge pump allow the MAX9730 to deliver an output power that is up to four times greater than a traditional single-supply linear amplifier. This allows the MAX9730 to maintain 0.8W into an 8Ω load as the battery rail collapses. Class G Operation and Efficiency The MAX9730 Class G amplifier is a linear amplifier that operates within a low (VCC to GND) and high (VCC to SVSS) supply range. Figure 1 illustrates the transition from the low to high supply range. For small signals, the device operates within the lower (VCC to GND) sup- ply range. In this range, the operation of the device is identical to a traditional single-supply Class AB amplifi- er where: ILOAD = IN1 As the output signal increases, so a wider supply is needed, the device begins its transition to the higher sup- ply range (VCC to SVSS) for the large signals. To ensure a seamless transition between the low and high supply ranges, both of the lower transistors are on so that: ILOAD = IN1 + IN2 As the output signal continues to increase, the transi- tion to the high supply is complete. The device then operates in the higher supply range, where the opera- tion of the device is identical to a traditional dual-sup- ply Class AB amplifier where: ILOAD = IN2 During operation, the output common-mode voltage of the MAX9730 adjusts dynamically as the device transi- tions between supply ranges. Figure 1. Class G Supply Transition |
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