Lm380

LM380 2.5W Audio Power Amplifier

August 2000

LM380 2.5W Audio Power Amplifier
General Description
The LM380 is a power audio amplifier for consumer applications. In order to hold system cost to a minimum, gain is internally fixed at 34 dB. A unique input stage allows ground referenced input signals. The output automatically selfcenters to one-half the supply voltage. The output is shortcircuit proof with internal thermal limiting. The package outline is standard dual-in-line. The LM380N uses a copper lead frame. The center three pins on either side comprise a heat sink. This makes the device easy to use in standard PC layouts. Uses include simple phonograph amplifiers, intercoms, line drivers, teaching machine outputs, alarms, ultrasonic drivers, TV sound systems, AM-FM radio,small servo drivers, power converters, etc. A selected part for more power on higher supply voltages is available as the LM384. For more information see AN-69.

Features
Wide supply voltage range: 10V-22V Low quiescent power drain: 0.13W (VS= 18V) Voltage gain fixed at 50 High peak current capability: 1.3A Input referenced to GND High input impedance: 150kΩ Low distortion Quiescent output voltageis at one-half of the supply voltage n Standard dual-in-line package n n n n n n n n

Connection Diagrams

(Dual-In-Line Packages, Top View)

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Order Number LM380N See NS Package Number N14A

Order Number LM380N-8 See NS Package Number N08E

© 2004 National Semiconductor Corporation

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Block and Schematic Diagrams
LM380NLM380N-8

00697703

00697704

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Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage Peak Current Package Dissipation 14-Pin DIP (Note 7) Package Dissipation 8-Pin DIP (Note 7) Input VoltageStorage Temperature 22V 1.3A 8.3W 1.67W

Operating Temperature Junction Temperature Lead Temperature (Soldering, 10 sec.) ESD rating to be determined Thermal Resistance θJC (14-Pin DIP) θJC (8-Pin DIP) θJA (14-Pin DIP) θJA (8-Pin DIP)

0˚C to +70˚C +150˚C +260˚C

30˚C/W 37˚C/W 79˚C/W 107˚C/W

± 0.5V
−65˚C to +150˚C

Electrical Characteristics (Note 2)
Symbol POUT(RMS) AV VOUT ZIN THD PSRRVS BW IQ VOUTQ IBIAS ISC Gain Output Voltage Swing Input Resistance Total Harmonic Distortion Power Supply Rejection Ratio Supply Voltage Bandwidth Quiescent Supply Current Quiescent Output Voltage Bias Current Short Circuit Current Inputs Floating 8 POUT = 2W, RL = 8Ω (Notes 5, 6) (Note 3) 10 100k 7 9.0 100 1.3 25 10 RL = 8Ω Parameter Output Power Conditions RL = 8Ω, THD = 3% (Notes 4, 5) Min 2.540 50 14 150k 0.2 38 22 60 Typ Max Units W V/V Vp-p Ω % dB V Hz mA V nA A

Note 1: “Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is functional, but do not guarantee specific performance limits. Note 2: VS = 18V and TA = 25˚C unless otherwise specified. Note 3: Rejection ratio referred to theoutput with CBYPASS = 5 µF. Note 4: With device Pins 3, 4, 5, 10, 11, 12 soldered into a 1/16" epoxy glass board with 2 ounce copper foil with a minimum surface of 6 square inches. Note 5: CBYPASS = 0.47 µfd on Pin 1. Note 6: The maximum junction temperature of the LM380 is 150˚C. Note 7: The package is to be derated at 15˚C/W junction to heat sink pins for 14-pin pkg; 75˚C/W for 8-pin.

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Heat Sink Dimensions

00697706

Staver Heat Sink #V-7 Staver Company 41 Saxon Ave. P.O. Drawer H Bayshore, NY 11706 Tel: (516) 666-8000 Copper Wings 2 Required Soldered to Pins 3, 4, 5, 10, 11, 12 Thickness 0.04 Inches

Typical Performance Characteristics
Maximum Device Dissipation vs Ambient Temperature Device Dissipation vs Output Power — 4Ω Load

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