Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsLinear ICsLinear IC - Audio amplifier 2-channel (stereo) Class AB SOIC 8

LM4880

www.ti.com

SNAS103C –NOVEMBER 1995–REVISED MAY 2013

LM4880 Dual 250 mW Audio Power Amplifier with

Shutdown Mode

Check for Samples: LM4880

FEATURES

DESCRIPTION

The LM4880 is a dual audio power amplifier capable

• No Bootstrap Capacitors or Snubber Circuits

of delivering typically 250mW per channel of

are Necessary

continuous average power to an 8Ω load with 0.1%

• Small Outline (SOIC) and PDIP Packaging

THD+N using a 5V power supply.

• Unity-Gain Stable

Boomer audio power amplifiers were designed

• External Gain Configuration Capability

specifically to provide high quality output power with a

minimal amount of external components using

APPLICATIONS

surface mount packaging.

• Headphone Amplifier

Since the LM4880 does not require bootstrap

capacitors or snubber networks, it is optimally suited

• Personal Computers

for low-power portable systems.

• CD-ROM Players

The LM4880 features an externally controlled, low-

power consumption shutdown mode, as well as an

KEY SPECIFICATIONS

internal thermal shutdown protection mechanism.

• THD+N at 1kHz at 200mW Continuous Average

The unity-gain stable LM4880 can be configured by

Output Power into 8Ω: 0.1% (max)

external gain-setting resistors.

• THD+N at 1kHz at 85mW Continuous Average

Output Power into 32Ω: 0.1% (typ)

• Output Power at 10% THD+N at 1kHz into 8Ω

325 mW (typ)

• Shutdown Current 0.7 µA (typ)

• 2.7V to 5.5V Supply Voltage Range

Connection Diagram

Figure 1. Small Outline and PDIP Packages- Top View

See Package Number D0008A for SOIC

or Package Number P0008E for PDIP

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (20 pages)

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LM4880 www.ti.com SNAS103C – NOVEMBER 1995 – REVISED MAY 2013 LM4880 Dual 250 mW Audio Power Amplifier with Shutdown Mode Check for Samples: LM4880 FEATURES DESCRIPTION • The LM4880 is a dual audio power amplifier capable of delivering typically 250mW per channel of continuous average power to an 8Ω load with 0.1% THD+N using a 5V power supply.
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LM4880 SNAS103C – NOVEMBER 1995 – REVISED MAY 2013 www.ti.com Typical Application *Refer to Application Information for information concerning proper selection of the input and output coupling capacitors. Figure 2. Typical Audio Amplifier Application Circuit These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
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LM4880 www.ti.com SNAS103C – NOVEMBER 1995 – REVISED MAY 2013 Operating Ratings TMIN≤TA≤TMAX Temperature Range −40°C≤TA≤+85°C 2.7V≤VDD≤5.5V Supply Voltage Electrical Characteristics (1) (2) The following specifications apply for VDD = 5V unless otherwise specified. Limits apply for TA = 25°C. Symbol Parameter Conditions LM4880 Typical (3) Limit Units (Limits) (4) VDD Supply Voltage 2.7 V (min) 5.5 V (max) IDD Quiescent Power Supply Current VIN=0V, IO=0A 3.6 6.
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LM4880 SNAS103C – NOVEMBER 1995 – REVISED MAY 2013 www.ti.com Automatic Switching Circuit Figure 4. Automatic Switching Circuit External Components Description (Figure 2) Components Functional Description 1. Ri Inverting input resistance which sets the closed-loop gain in conjunction with RF. This resistor also forms a high pass filter with Ci at fc = 1/(2πRiCi). 2. Ci Input coupling capacitor which blocks the DC voltage at the amplifier's input terminals.
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LM4880 www.ti.com SNAS103C – NOVEMBER 1995 – REVISED MAY 2013 Typical Performance Characteristics THD + N vs Output Power THD + N vs Output Power Figure 5. Figure 6. THD + N vs Output Power THD + N vs Output Power Figure 7. Figure 8. THD + N vs Output Power THD + N vs Output Power Figure 9. Figure 10.
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LM4880 SNAS103C – NOVEMBER 1995 – REVISED MAY 2013 www.ti.com Typical Performance Characteristics (continued) 6 THD + N vs Frequency THD + N vs Frequency Figure 11. Figure 12. THD + N vs Frequency THD + N vs Frequency Figure 13. Figure 14. Output Power vs Load Resistance Output Power vs Load Resistance Figure 15. Figure 16.
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LM4880 www.ti.com SNAS103C – NOVEMBER 1995 – REVISED MAY 2013 Typical Performance Characteristics (continued) Output Power vs Supply Voltage Output Power vs Supply Voltage Figure 17. Figure 18. Output Power vs Supply Voltage Clipping Voltage vs Supply Voltage Figure 19. Figure 20. Clipping Voltage vs Supply Voltage Power Dissipation vs Output Power Figure 21. Figure 22.
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LM4880 SNAS103C – NOVEMBER 1995 – REVISED MAY 2013 www.ti.com Typical Performance Characteristics (continued) 8 Channel Separation Output Attenuation in Shutdown Mode Figure 23. Figure 24. Noise Floor Power Supply Rejection Ratio Figure 25. Figure 26. Open Loop Frequency Response Supply Current vs Supply Voltage Figure 27. Figure 28.
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LM4880 www.ti.com SNAS103C – NOVEMBER 1995 – REVISED MAY 2013 Typical Performance Characteristics (continued) Frequency Response vs Output Capacitor Size Frequency Response vs Output Capacitor Size Figure 29. Figure 30. Frequency Response vs Input Capacitor Size Typical Application Frequency Response Figure 31. Figure 32. Typical Application Frequency Response Power Derating Curve Figure 33. Figure 34.
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LM4880 SNAS103C – NOVEMBER 1995 – REVISED MAY 2013 www.ti.com APPLICATION INFORMATION SHUTDOWN FUNCTION In order to reduce power consumption while not in use, the LM4880 contains a shutdown pin to externally turn off the amplifier's bias circuitry. This shutdown feature turns the amplifier off when a logic high is placed on the shutdown pin. The trigger point between a logic low and logic high level is typically half supply.
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LM4880 www.ti.com SNAS103C – NOVEMBER 1995 – REVISED MAY 2013 AUTOMATIC SHUTDOWN CIRCUIT As shown in Figure 3, the LM4880 can be set up to automatically shutdown when a load is not connected. This circuit is based upon a single control pin common in many headphone jacks. This control pin forms a normally closed switch with one of the output pins. The output of this circuit (the voltage on pin 5 of the LM4880) has two states based on the state of the switch.
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LM4880 SNAS103C – NOVEMBER 1995 – REVISED MAY 2013 www.ti.com In addition to system cost and size, click and pop performance is effected by the size of the input coupling capacitor, Ci. A larger input coupling capacitor requires more charge to reach its quiescent DC voltage (normally 1/2 VDD.) This charge comes from the output via the feedback and is apt to create pops upon device enable. Thus, by minimizing the capacitor size based on necessary low frequency response, turn-on pops can be minimized.
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LM4880 www.ti.com SNAS103C – NOVEMBER 1995 – REVISED MAY 2013 Co ≥ 1/(2π*8Ω*20Hz) = 995 μF; use 1000 μF The high frequency pole is determined by the product of the desired high frequency pole, fH, and the closed-loop gain, AV. With a closed-loop gain magnitude of 1.35 and fH = 100 kHz, the resulting GBWP = 135 kHz which is much smaller than the LM4880 GBWP of 12.5 MHz.
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LM4880 SNAS103C – NOVEMBER 1995 – REVISED MAY 2013 www.ti.
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LM4880 www.ti.com SNAS103C – NOVEMBER 1995 – REVISED MAY 2013 REVISION HISTORY Changes from Revision B (May 2013) to Revision C • Page Changed layout of National Data Sheet to TI format ..........................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE MATERIALS INFORMATION www.ti.com 8-May-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device LM4880MX/NOPB Package Package Pins Type Drawing SOIC D 8 SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 2500 330.0 12.4 Pack Materials-Page 1 6.5 B0 (mm) K0 (mm) P1 (mm) 5.4 2.0 8.0 W Pin1 (mm) Quadrant 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 8-May-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM4880MX/NOPB SOIC D 8 2500 367.0 367.0 35.
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