Datasheet

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LM4876

www.ti.com

SNAS054E –FEBRUARY 2000–REVISED MAY 2013

LM4876 1.1W Audio Power Amplifier with Logic Low

Shutdown

Check for Samples: LM4876

FEATURES

DESCRIPTION

The LM4876 is a single 5V supply bridge-connected

• Does Not Require Output Coupling Capacitors,

audio power amplifier capable of delivering 1.1W (typ)

Bootstrap Capacitors, Or Snubber Circuits

of continuous average power to an 8Ω load with 0.5%

• 10-pin VSSOP and 8-pin SOIC Packages

THD+N.

• Unity-Gain Stable

Like other audio amplifiers in the Boomer series, the

• External Gain Set

LM4876 is designed specifically to provide high

quality output power with a minimal amount of

APPLICATIONS

external components. The LM4876 does not require

output coupling capacitors, bootstrap capacitors, or

• Mobile Phones

snubber networks. It is perfectly suited for low-power

• Portable Computers

portable systems.

• Desktop Computers

The LM4876 features an active low externally

• Low-Voltage Audio Systems

controlled, micro-power shutdown mode. Additionally,

the LM4876 features an internal thermal shutdown

KEY SPECIFICATIONS

protection mechanism. For PCB space efficiency, the

LM4876 is available in VSSOP and SOIC surface

• THD+N at 1kHz for 1W Continuous Average

mount packages.

Output Power into 8Ω 0.5% (max)

The unity-gain stable LM4876's closed loop gain is

• Output Power At 1kHz Into 8Ω with 10%

set using external resistors.

THD+N 1.5 W (typ)

• Shutdown Current 0.01µA (typ)

• Supply Voltage Range 2.0V to 5.5 V

Typical Application

Figure 1. Typical LM4876 Audio Amplifier Application Circuit

Numbers in ( ) are specific to the 10-pin VSSOP package.

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 (19 pages)

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LM4876 www.ti.com SNAS054E – FEBRUARY 2000 – REVISED MAY 2013 LM4876 1.1W Audio Power Amplifier with Logic Low Shutdown Check for Samples: LM4876 FEATURES DESCRIPTION • The LM4876 is a single 5V supply bridge-connected audio power amplifier capable of delivering 1.1W (typ) of continuous average power to an 8Ω load with 0.5% THD+N.
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LM4876 SNAS054E – FEBRUARY 2000 – REVISED MAY 2013 www.ti.com Connection Diagrams Figure 2. VSSOP Package – Top View See Package Number DGS Figure 3. SOIC Package – Top View See Package Number D 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. Absolute Maximum Ratings (1) (2) Supply Voltage 6.0V −65°C to +150°C Storage Temperature −0.
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LM4876 www.ti.com SNAS054E – FEBRUARY 2000 – REVISED MAY 2013 Electrical Characteristics (1) (2) The following specifications apply for VDD = 5V unless otherwise specified. Limits apply for TA = 25°C. Symbol Parameter Conditions LM4876 Typical (3) Limit (4) Units (Limits) 2.0 V (min) 5.5 V (max) 10.0 mA (max) VDD Supply Voltage IDD Quiescent Power Supply Current VIN = 0V, Io = 0A 6.5 ISD Shutdown Current VPIN1 = 0V 0.
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LM4876 SNAS054E – FEBRUARY 2000 – REVISED MAY 2013 www.ti.com Typical Performance Characteristics 4 THD+N vs Frequency THD+N vs Frequency Figure 4. Figure 5. THD+N vs Frequency THD+N vs Output Power Figure 6. Figure 7. THD+N vs Output Power THD+N vs Output Power Figure 8. Figure 9.
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LM4876 www.ti.com SNAS054E – FEBRUARY 2000 – REVISED MAY 2013 Typical Performance Characteristics (continued) Output Power vs Supply Voltage Output Power vs Supply Voltage Figure 10. Figure 11. Output Power vs Supply Voltage Output Power vs Supply Voltage Figure 12. Figure 13. Output Power vs Load Resistance Power Dissipation vs Output Power Figure 14. Figure 15.
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LM4876 SNAS054E – FEBRUARY 2000 – REVISED MAY 2013 www.ti.com Typical Performance Characteristics (continued) Power Derating Curve Clipping Voltage vs Supply Voltage Figure 16. Noise Floor 6 Figure 17. Frequency Response vs Input Capacitor Size Figure 18. Figure 19. Power Supply Rejection Ratio Open Loop Frequency Response Figure 20. Figure 21.
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LM4876 www.ti.com SNAS054E – FEBRUARY 2000 – REVISED MAY 2013 Typical Performance Characteristics (continued) Supply Current vs Supply Voltage Supply Current vs Shutdown Voltage LM4876 @ VDD = 5/3.3/2.6Vdc Figure 22. Figure 23.
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LM4876 SNAS054E – FEBRUARY 2000 – REVISED MAY 2013 www.ti.com APPLICATION INFORMATION BRIDGE CONFIGURATION EXPLANATION As shown in Figure 1, the LM4876 consists of two operational amplifiers. External resistors Rf and Ri set the closed-loop gain of Amp1, whereas two internal 40kΩ resistors set Amp2's gain at -1. The LM4876 drives a load, such as a speaker, connected between the two amplifier outputs, Vo1 and Vo2 .
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LM4876 www.ti.com SNAS054E – FEBRUARY 2000 – REVISED MAY 2013 For the VSSOP10A package, θJA = 210°C/W. Equation 6 shows that TJMAX , for the VSSOP10 package, is 158°C for an ambient temperature of 25°C and using the same 5V power supply and an 8Ω load. This violates the LM4876's 150°C maximum junction temperature when using the VSSOP10A package. Reduce the junction temperature by reducing the power supply voltage or increasing the load resistance.
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LM4876 SNAS054E – FEBRUARY 2000 – REVISED MAY 2013 www.ti.com SELECTING PROPER EXTERNAL COMPONENTS Optimizing the LM4876's performance requires properly selecting external components. Though the LM4876 operates well when using external components with wide tolerances, best performance is achieved by optimizing component values. The LM4876 is unity-gain stable, giving a designer maximum design flexibility. The gain should be set to no more than a given application requires.
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LM4876 www.ti.com SNAS054E – FEBRUARY 2000 – REVISED MAY 2013 The design begins by specifying the minimum supply voltage necessary to obtain the specified output power. One way to find the minimum supply voltage is to use the Output Power vs Supply Voltage curve in the Typical Performance Characteristics section. Another way, using Equation 8, is to calculate the peak output voltage necessary to achieve the desired output power for a given load impedance.
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LM4876 SNAS054E – FEBRUARY 2000 – REVISED MAY 2013 www.ti.com REVISION HISTORY Changes from Revision D (May 2013) to Revision E • 12 Page Changed layout of National Data Sheet to TI format ..........................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 9-Aug-2013 In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
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PACKAGE MATERIALS INFORMATION www.ti.com 12-Aug-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant LM4876MM/NOPB VSSOP DGS 10 1000 178.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1 LM4876MX/NOPB SOIC D 8 2500 330.0 12.4 6.5 5.4 2.0 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 12-Aug-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM4876MM/NOPB VSSOP DGS 10 1000 210.0 185.0 35.0 LM4876MX/NOPB SOIC D 8 2500 367.0 367.0 35.
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