LM389

www.DataSheet4U.com LM389 Low Voltage Audio Power Amplifier with NPN Transistor Array December 1994 LM389 Low Voltage Audio Power Amplifier with NPN Transistor Array General Description The LM389 is an array of three NPN transistors on the same substrate with an audio power amplifier similar to the LM386 The amplifier inputs are ground referenced while the output is automatically biased to one half the supply voltage The gain is internally set at 20 to minimize external parts but the addition of an external resistor and capacitor between pins 4 and 12 will increase the gain to any value up to 200 The three transistors have high gain and excellent matching characteristics They are well suited to a wide variety of applications in DC through VHF systems Low quiescent current drain Voltage gains from 20 to 200 Y Ground referenced input Y Self-centering output quiescent voltage Y Low distortion Transistors Y Operation from 1 mA to 25 mA Y Frequency range from DC to 100 MHz Y Excellent matching Y Y Applications Y Y Y Y Y Y Y Features Amplifier Y Battery operation Y Minimum external parts Y Wide supply voltage range AM-FM radios Portable tape recorders Intercoms Toys and games Walkie-talkies Portable phonographs Power converters Equivalent Schematic and Connection Diagrams TL H 7847 – 1 Dual-In-Line Package TL H 7847 – 2 Order Number LM389N See NS Package Number N18A C1995 National Semiconductor Corporation TL H 7847 RRD-B30M115 Printed in U S A www.DataSheet4U.com w...