Datasheet

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LM4860

www.ti.com

SNAS096C –AUGUST 1994–REVISED MAY 2013

LM4860 Series 1W Audio Power Amplifier with Shutdown

Mode

Check for Samples: LM4860

FEATURES

DESCRIPTION

The LM4860 is a bridge-connected audio power

• No Output Coupling Capacitors, Bootstrap

amplifier capable of delivering 1W of continuous

Capacitors, or Snubber Circuits are Necessary

average power to an 8Ω load with less than 1%

• Small Outline (SO) Packaging

THD+N over the audio spectrum from a 5V power

• Compatible with PC Power Supplies

supply.

• Thermal Shutdown Protection Circuitry

Boomer audio power amplifiers were designed

specifically to provide high quality output power with a

• Unity-Gain Stable

minimal amount of external components using

• External Gain Configuration Capability

surface mount packaging. Since the LM4860 does

• Two Headphone Control Inputs and

not require output coupling capacitors, bootstrap

Headphone Sensing Output

capacitors or snubber networks, it is optimally suited

for low-power portable systems.

APPLICATIONS

The LM4860 features an externally controlled, low-

• Personal Computers

power consumption shutdown mode, as well as an

internal thermal shutdown protection mechanism. It

• Portable Consumer Products

also includes two headphone control inputs and a

• Cellular Phones

headphone sense output for external monitoring.

• Self-Powered Speakers

The unity-gain stable LM4860 can be configured by

• Toys and Games

external gain setting resistors for differential gains of

up to 10 without the use of external compensation

KEY SPECIFICATIONS

components. Higher gains may be achieved with

suitable compensation.

• THD+N at 1W Continuous Average

• Output Power into 8Ω: 1% (Max)

• Instantaneous Peak Output Power: > 2 W

• Shutdown Current: 0.6 μA (typ)

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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LM4860 www.ti.com SNAS096C – AUGUST 1994 – REVISED MAY 2013 LM4860 Series 1W Audio Power Amplifier with Shutdown Mode Check for Samples: LM4860 FEATURES DESCRIPTION • The LM4860 is a bridge-connected audio power amplifier capable of delivering 1W of continuous average power to an 8Ω load with less than 1% THD+N over the audio spectrum from a 5V power supply.
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LM4860 SNAS096C – AUGUST 1994 – REVISED MAY 2013 www.ti.com Typical Application Figure 1. Typical Audio Amplifier Application Circuit Connection Diagram Figure 2.
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LM4860 www.ti.com SNAS096C – AUGUST 1994 – REVISED MAY 2013 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 −0.3V to VDD + 0.
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LM4860 SNAS096C – AUGUST 1994 – REVISED MAY 2013 www.ti.com High Gain Application Circuit Figure 3. Stereo Amplifier with AVD = 20 Single Ended Application Circuit *CS and CB size depend on specific application requirements and constraints. Typical values of CS and CB are 0.1 μF. **Pin 2, 6, or 7 should be connected to VDD to disable the amplifier or to GND to enable the amplifier. These pins should not be left floating. ***These components create a “dummy” load for pin 8 for stability purposes.
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LM4860 www.ti.com SNAS096C – AUGUST 1994 – REVISED MAY 2013 External Components Description (See Figure 1 and Figure 3) 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/(2π Ri Ci). 2. Ci Input coupling capacitor which blocks DC voltage at the amplifier's input terminals. Also creates a high pass filter with Ri at fC = 1/(2π Ri Ci). 3.
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LM4860 SNAS096C – AUGUST 1994 – REVISED MAY 2013 www.ti.com Typical Performance Characteristics 6 THD+N vs Frequency THD+N vs Frequency Figure 5. Figure 6. THD+N vs Frequency 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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LM4860 www.ti.com SNAS096C – AUGUST 1994 – REVISED MAY 2013 Typical Performance Characteristics (continued) Supply Current vs Time in Shutdown Mode Supply Current vs Supply Voltage Figure 11. Figure 12. Power Derating Curve LM4860 Noise Floor vs Frequency Figure 13. Figure 14. Supply Current Distribution vs Temperature Power Dissipation vs Output Power Figure 15. Figure 16.
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LM4860 SNAS096C – AUGUST 1994 – REVISED MAY 2013 www.ti.com Typical Performance Characteristics (continued) 8 Output Power vs Load Resistance Output Power vs Supply Voltage Figure 17. Figure 18. Open Loop Frequency Response Power Supply Rejection Ratio Figure 19. Figure 20.
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LM4860 www.ti.com SNAS096C – AUGUST 1994 – REVISED MAY 2013 APPLICATION INFORMATION BRIDGE CONFIGURATION EXPLANATION As shown in Figure 1, the LM4860 has two operational amplifiers internally, allowing for a few different amplifier configurations. The first amplifier's gain is externally configurable, while the second amplifier is internally fixed in a unity-gain, inverting configuration.
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LM4860 SNAS096C – AUGUST 1994 – REVISED MAY 2013 www.ti.com POWER SUPPLY BYPASSING As with any power amplifier, proper supply bypassing is critical for low noise performance and high power supply rejection. The capacitor location on both the bypass and power supply pins should be as close to the device as possible. As displayed in Typical Performance Characteristics, the effect of a larger half-supply bypass capacitor is improved low frequency THD+N due to increased half-supply stability.
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LM4860 www.ti.com SNAS096C – AUGUST 1994 – REVISED MAY 2013 For a system implementation where the headphone amplifier is designed using a split supply, the output coupling cap, CC and resistor R2 of Figure 22, can be eliminated. The functionality described earlier remains the same, however. In addition, the HP-SENSE pin, although it may be connected to the SHUTDOWN pin as shown in Figure 21, may still be used as a control flag.
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LM4860 SNAS096C – AUGUST 1994 – REVISED MAY 2013 www.ti.com HIGHER GAIN AUDIO AMPLIFIER The LM4860 is unity-gain stable and requires no external components besides gain-setting resistors, an input coupling capacitor, and proper supply bypassing in the typical application. However if a closed-loop differential gain of greater than 10 is required, then a feedback capacitor is needed, as shown in Figure 3, to bandwidth limit the amplifier.
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LM4860 www.ti.com SNAS096C – AUGUST 1994 – REVISED MAY 2013 For 500 mW of output power into an 8Ω load, the required Vopeak is 2.83V. A minimum supply rail of 3.53V results from adding Vopeak and Vod. But 3.53V is not a standard voltage that exists in many applications and for this reason, a supply rail of 5V is designated. Extra supply voltage creates dynamic headroom that allows the LM4860 to reproduce peaks in excess of 500 mW without clipping the signal.
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LM4860 SNAS096C – AUGUST 1994 – REVISED MAY 2013 www.ti.com REVISION HISTORY Changes from Revision B (May 2013) to Revision C • 14 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.
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PACKAGE MATERIALS INFORMATION www.ti.com 8-May-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 LM4860MX SOIC D 16 2500 330.0 16.4 6.5 10.3 2.3 8.0 16.0 Q1 LM4860MX/NOPB SOIC D 16 2500 330.0 16.4 6.5 10.3 2.3 8.0 16.
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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) LM4860MX SOIC D 16 2500 367.0 367.0 35.0 LM4860MX/NOPB SOIC D 16 2500 367.0 367.0 35.
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