Datasheet

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LM4936

www.ti.com

SNAS269A –APRIL 2005–REVISED APRIL 2013

LM4936 Boomer™ Audio Power Amplifier Series Stereo 2W Audio Power Amplifiers with

Volume Control and Selectable Control Interface (SPI or I

Check for Samples: LM4936

FEATURES

DESCRIPTION

The LM4936 is a monolithic integrated circuit that

• Selectable SPI or I

C Control Interface

provides volume control, and stereo bridged audio

• System Beep Detect

power amplifiers capable of producing 2W into 4Ω

(1)

• Stereo Switchable Bridged/Single-Ended

with less than 1% THD or 2.2W into 3Ω

(2)

with less

Power Amplifiers

than 1% THD.

• Selectable Internal/External Gain and Bass

Boomer audio integrated circuits were designed

Boost

specifically to provide high quality audio while

requiring a minimum amount of external components.

• “Click and Pop” Suppression Circuitry

The LM4936 incorporates a SPI or I

C Control

• Thermal Shutdown Protection Circuitry

Interface that runs the volume control, stereo bridged

• Headphone Sense

audio power amplifiers and a selectable gain or bass

boost. All of the LM4936's features (i.e. SD, Mode,

APPLICATIONS

Mute, Gain Sel) make it optimally suited for

multimedia monitors, portable radios, desktop, and

• Portable and Desktop Computers

portable computer applications.

• Multimedia Monitors

The LM4936 features an externally controlled, low-

• Portable Radios, PDAs, and Portable TVs

power consumption shutdown mode, and both a

power amplifier and headphone mute for maximum

KEY SPECIFICATIONS

system flexibility and performance.

• P

at 1% THD+N

– into 3Ω, 2.2W (Typ)

– into 4Ω, 2.0W (Typ)

(1) When properly mounted to the circuit board, LM4936MH will

– into 8Ω, 1.25W (Typ)

deliver 2W into 4Ω. See Application Information section

HTSSOP PACKAGE PCB MOUNTING CONSIDERATIONS

• Single-ended mode - THD+N at 90mW into

for more information.

32Ω, 1% (Typ)

(2) An LM4936MH that has been properly mounted to the circuit

• Shutdown current, 0.7µA (Typ) board and forced-air cooled will deliver 2.2W into 3Ω.

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.

2Boomer is a trademark of Texas Instruments.

3All other 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 (35 pages)

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LM4936 www.ti.
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LM4936 SNAS269A – APRIL 2005 – REVISED APRIL 2013 www.ti.com Connection Diagram GND 2 I C/SPI Select ID/CE SCL/CLK SDA/DATA 2 I C/SPI VDD VDD GND Right Dock Right In Beep In Left In Left Dock GND 1 28 2 27 3 26 4 25 5 24 6 23 7 22 8 21 9 20 10 19 11 18 12 17 13 16 14 15 Right Out+ VDD Right Out Right Gain 2 Right Gain 1 GND Bypass HP Sense GND Left Gain 1 Left Gain 2 Left OutVDD Left Out+ Figure 1.
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LM4936 www.ti.com SNAS269A – APRIL 2005 – REVISED APRIL 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 Storage Temperature -65°C to +150°C −0.3V to VDD +0.
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LM4936 SNAS269A – APRIL 2005 – REVISED APRIL 2013 www.ti.com Electrical Characteristics for Entire IC (1) (2) The following specifications apply for VDD = 5V unless otherwise noted. Limits apply for TA = 25°C. Symbol VDD Parameter Conditions LM4936 Typical (3) Limit (4) Supply Voltage Units (Limits) 2.7 V (min) 5.5 V (max) mA (max) IDD Quiescent Power Supply Current VIN = 0V, IO = 0A 10 25 ISD Shutdown Current Vshutdown = VDD 0.7 2.
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LM4936 www.ti.com SNAS269A – APRIL 2005 – REVISED APRIL 2013 Electrical Characteristics for Control Interface (1) (2) The following specifications apply for VDD = 5V, VDD = 3V and 2.4V ≤ I2C/SPI VDD ≤ 5.5V. Limits apply for TA = 25°C. Symbol Parameter Conditions LM4936 Typical (3) Limit (4) Units (Limits) t1 SCL period 2.
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LM4936 SNAS269A – APRIL 2005 – REVISED APRIL 2013 www.ti.com Electrical Characteristics for Bridged Mode Operation (1) (2) The following specifications apply for VDD = 5V, unless otherwise noted. Limits apply for TA = 25°C. Symbol Parameter LM4936 Conditions Typical (3) Limit (4) Units (Limits) 50 mV (max) VOS Output Offset Voltage VIN = 0V, No Load 10 PO Output Power THD + N = 1%; f = 1kHz; RL = 3Ω (5) 2.
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LM4936 www.ti.com SNAS269A – APRIL 2005 – REVISED APRIL 2013 Typical Application Figure 3.
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LM4936 SNAS269A – APRIL 2005 – REVISED APRIL 2013 www.ti.com Table 1. I2C/SPI Interface Controls (1) B7 B6 B5 B4 B3 B2 B1 B0 I2C Address 1 1 0 1 1 0 ID 0 Mode Control Register 0 0 0 HP Control Gain Sel Mode Mute Shutdown Volume Control Register (See Table 4) 1 0 0 V4 V3 V2 V1 V0 (1) If system beep is detected on the Beep In pin, the system beep will be passed through the bridged amplifier regardless of the logic of the Mute and HP Control bits (B1, B4) and HP Sense pin.
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LM4936 www.ti.com SNAS269A – APRIL 2005 – REVISED APRIL 2013 Typical Performance Characteristics THD+N vs Output Power/Channel VDD = 5V, RL = 3Ω, AV-BTL = 2V/V f = 1kHz, 80kHz BW THD+N vs Frequency VDD = 5V, RL = 3Ω, AV-BTL = 2V/V POUT = 1.5W/Channel, 80kHz BW Figure 4. Figure 5. THD+N vs Output Power/Channel VDD = 5V, RL = 4Ω, AV-BTL = 2V/V f = 1kHz, 80kHz BW THD+N vs Frequency VDD = 5V, RL = 4Ω, AV-BTL = 2V/V POUT = 1.5W/Channel, 80kHz BW Figure 6. Figure 7.
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LM4936 SNAS269A – APRIL 2005 – REVISED APRIL 2013 www.ti.com Typical Performance Characteristics (continued) 10 THD+N vs Output Power/Channel VDD = 5V, RL = 8Ω, AV-SE = 1V/V f = 1kHz, COUT = 220µF, 80kHz BW THD+N vs Frequency VDD = 5V, RL = 8Ω, AV-SE = 1V/V POUT = 100mW/Channel, 80kHz BW Figure 10. Figure 11. THD+N vs Output Power/Channel VDD = 5V, RL = 32Ω, AV-SE = 1V/V f = 1kHz, COUT = 220µF, 80kHz BW THD+N vs Frequency VDD = 5V, RL = 32Ω, AV-SE = 1V/V POUT = 40mW/Channel, 80kHz BW Figure 12.
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LM4936 www.ti.com SNAS269A – APRIL 2005 – REVISED APRIL 2013 Typical Performance Characteristics (continued) THD+N vs Output Power/Channel VDD = 3V, RL = 4Ω, AV-BTL = 2V/V f = 1kHz, 80kHz BW THD+N vs Frequency VDD = 3V, RL = 4Ω, AV-BTL = 2V/V POUT = 450mW/Channel, 80kHz BW Figure 16. Figure 17. THD+N vs Output Power/Channel VDD = 3V, RL = 8Ω, AV-BTL = 2V/V f = 1kHz, 80kHz BW THD+N vs Frequency VDD = 3V, RL = 8Ω, AV-BTL = 2V/V POUT = 250mW/Channel, 80kHz BW Figure 18. Figure 19.
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LM4936 SNAS269A – APRIL 2005 – REVISED APRIL 2013 www.ti.com Typical Performance Characteristics (continued) 12 THD+N vs Output Power/Channel VDD = 3V, RL = 32Ω, AV-SE = 1V/V f = 1kHz, COUT = 220µF, 80kHz BW THD+N vs Frequency VDD = 3V, RL = 32Ω, AV-SE = 1V/V POUT = 20mW/Channel, 80kHz BW Figure 22. Figure 23. THD+N vs Output Voltage VDD = 5V, RLDOCK = 10kΩ, Dock Pins f = 1kHz, CO = 1µF, 80kHz BW THD+N vs Frequency VDD = 5V, RLDOCK = 10kΩ, Dock Pins VIN = 1Vp-p, CO = 1µF, 80kHz BW Figure 24.
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LM4936 www.ti.com SNAS269A – APRIL 2005 – REVISED APRIL 2013 Typical Performance Characteristics (continued) PSRR vs Frequency VDD = 5V, VRIPPLE = 200mVp-p Inputs Terminated, 80kHz BW PSRR vs Frequency VDD = 3V, VRIPPLE = 200mVp-p Inputs Terminated, 80kHz BW Figure 28. Figure 29. Crosstalk vs Frequency VDD = 5V, RL = 8Ω, AV-BTL = 2V/V POUT = 1W, 80kHz BW Crosstalk vs Frequency VDD = 3V, RL = 8Ω, AV-BTL = 2V/V POUT = 250mW, 80kHz BW Figure 30. Figure 31.
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LM4936 SNAS269A – APRIL 2005 – REVISED APRIL 2013 www.ti.com Typical Performance Characteristics (continued) 14 Headphone Sense Threshold vs Supply Voltage RL = 8Ω, AV-SE = 1V/V COUT = 220µF, 80kHz BW Output Level vs Frequency External Gain with Bass Boost Figure 34. Figure 35. Output Power/Channel vs Supply Voltage RL = 3Ω, AV-BTL = 2V/V, 80kHz BW Output Power/Channel vs Supply Voltage RL = 4Ω, AV-BTL = 2V/V, 80kHz BW Figure 36. Figure 37.
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LM4936 www.ti.com SNAS269A – APRIL 2005 – REVISED APRIL 2013 Typical Performance Characteristics (continued) Output Power/Channel vs Supply Voltage RL = 32Ω, AV-SE = 1V/V, 80kHz BW Power Derating Curve These curves show the thermal dissipation ability of the LM4936MH at different ambient temperatures given these conditions: 500LFPM + 2in2: The part is soldered to a 2in2, 1 oz. copper plane with 500 linear feet per minute of forced-air flow across it. 2in2on bottom: The part is soldered to a 2in2, 1oz.
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LM4936 SNAS269A – APRIL 2005 – REVISED APRIL 2013 www.ti.com Typical Performance Characteristics (continued) 16 Power Dissipation vs Output Power/Channel VDD = 5V, AV-SE = 1V/V, THD+N ≤ 1%, 80kHz BW Power Dissipation vs Output Power/Channel VDD = 3V, AV-SE = 1V/V, THD+N ≤ 1%, 80kHz BW Figure 44. Figure 45. Supply Current vs Supply Voltage RL = 8Ω Dropout Voltage Figure 46. Figure 47. Output Power/Channel vs Load Resistance Output Power/Channel vs Load Resistance Figure 48. Figure 49.
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LM4936 www.ti.com SNAS269A – APRIL 2005 – REVISED APRIL 2013 Typical Performance Characteristics (continued) Output Power/Channel vs Load Resistance Output Power/Channel vs Load Resistance Figure 50. Figure 51.
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LM4936 SNAS269A – APRIL 2005 – REVISED APRIL 2013 www.ti.com APPLICATION INFORMATION I2C COMPATIBLE INTERFACE The LM4936 uses a serial bus, which conforms to the I2C protocol, to control the chip's functions with two wires: clock (SCL) and data (SDA). The clock line is uni-directional. The data line is bi-directional (open-collector). The maximum clock frequency specified by the I2C standard is 400kHz. In this discussion, the master is the controlling microcontroller and the slave is the LM4936.
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LM4936 www.ti.com SNAS269A – APRIL 2005 – REVISED APRIL 2013 Best thermal performance is achieved with the largest practical copper heat sink area. If the heatsink and amplifier share the same PCB layer, a nominal 2.5in2 (min) area is necessary for 5V operation with a 4Ω load. Heatsink areas not placed on the same PCB layer as the LM4936 should be 5in2 (min) for the same supply voltage and load resistance. The last two area recommendations apply for 25°C ambient temperature.
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LM4936 SNAS269A – APRIL 2005 – REVISED APRIL 2013 PDMAX = (VDD)2/(2π2RL) www.ti.com Single-Ended (2) However, a direct consequence of the increased power delivered to the load by a bridge amplifier is higher internal power dissipation for the same conditions. The LM4936 has two operational amplifiers per channel. The maximum internal power dissipation per channel operating in the bridge mode is four times that of a single-ended amplifier.
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LM4936 www.ti.com SNAS269A – APRIL 2005 – REVISED APRIL 2013 SELECTING PROPER EXTERNAL COMPONENTS Optimizing the LM4936's performance requires properly selecting external components. Though the LM4936 operates well when using external components with wide tolerances, best performance is achieved by optimizing component values. The LM4936 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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LM4936 SNAS269A – APRIL 2005 – REVISED APRIL 2013 www.ti.com DOCKING STATION INTERFACE Applications such as notebook computers can take advantage of a docking station to connect to external devices such as monitors or audio/visual equipment that sends or receives line level signals. The LM4936 has two outputs, Right Dock and Left Dock, which connect to outputs of the internal input amplifiers that drive the volume control inputs.
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LM4936 www.ti.com SNAS269A – APRIL 2005 – REVISED APRIL 2013 Figure 52. Headphone Sensing Circuit HP SENSE FUNCTION ( Headphone In ) Applying a voltage between the VIH threshold shown in the graph found in the Typical Performance Characteristics and VDD to the LM4936's HP SENSE control pin or loading a digital 1 into the HP Control bit (B4) will change the output mode. The '+' outputs will change to be in phase with the '-' outputs instead of 180 degrees out of phase.
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LM4936 SNAS269A – APRIL 2005 – REVISED APRIL 2013 www.ti.com AVD = 2(RF + RBS) / Ri (10) Using the component values shown in Figure 3 (RF = 20kΩ, RBS = 20kΩ, and CBS = 0.068µF), a first-order, -6dB pole is created at 120Hz. Assuming R i = 20kΩ, the low frequency differential gain is 4V/V or 12dB. The input (Ci) and output (COUT) capacitor values must be selected for a low frequency response that covers the range of frequencies affected by the desired bass-boost operation.
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LM4936 www.ti.com SNAS269A – APRIL 2005 – REVISED APRIL 2013 AUDIO POWER AMPLIFIER DESIGN Audio Amplifier Design: Driving 1W into an 8Ω Load The following are the desired operational parameters: Power Output: 1 WRMS Load Impedance: 8Ω Input Level: 1 VRMS Input Impedance: 20 kΩ Bandwidth: 100 Hz−20 kHz ± 0.25 dB The design begins by specifying the minimum supply voltage necessary to obtain the specified output power.
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LM4936 SNAS269A – APRIL 2005 – REVISED APRIL 2013 www.ti.com The product of the desired high frequency cutoff (100kHz in this example) and the differential gain AVD, determines the upper passband response limit. With AVD = 3 and fH = 100kHz, the closed-loop gain bandwidth product (GBWP) is 300kHz. This is less than the LM4936's 3.5MHz GBWP. With this margin, the amplifier can be used in designs that require more differential gain while avoiding performance,restricting bandwidth limitations.
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LM4936 www.ti.com SNAS269A – APRIL 2005 – REVISED APRIL 2013 Figure 54.
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LM4936 SNAS269A – APRIL 2005 – REVISED APRIL 2013 www.ti.com LM4936 MH HTSSOP Board Artwork (1) (2) (1) (2) 28 Composite View Silk Screen Top Layer Internal Layer 1 Internal Layer 2 Bottom Layer When driving 3Ω loads from a 5V supply the LM4936MH must be mounted to the circuit board and forced-air cooled. The demo board shown in the datasheet has planes for heat sinking. The top layer plane is 1.05 in2 (675mm2), the inner two layers each have a 1.
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LM4936 www.ti.com SNAS269A – APRIL 2005 – REVISED APRIL 2013 Table 5. LM4936 Board Bill of Materials Designator Value Tolerance Part Description RIN1, RIN2 20kΩ 1% 1/10W, 0805 Resistor RI1, RI2 20kΩ 1% 1/10W, 0805 Resistor RF1, RF2 20kΩ 1% 1/10W, 0805 Resistor RDOCK1, RDOCK2 20kΩ 1% 1/10W, 0805 Resistor RBS1, RBS2 20kΩ 1% 1/10W, 0805 Resistor RBEEP1, RBEEP2 200kΩ 1% 1/10W, 0805 Resistor RL1, RL2 1.
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LM4936 SNAS269A – APRIL 2005 – REVISED APRIL 2013 www.ti.com REVISION HISTORY Changes from Original (April 2013) to Revision A • 30 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-Apr-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device LM4936MHX/NOPB Package Package Pins Type Drawing SPQ HTSSOP 2500 PWP 28 Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 330.0 16.4 Pack Materials-Page 1 6.8 B0 (mm) K0 (mm) P1 (mm) 10.2 1.6 8.0 W Pin1 (mm) Quadrant 16.
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PACKAGE MATERIALS INFORMATION www.ti.com 8-Apr-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM4936MHX/NOPB HTSSOP PWP 28 2500 367.0 367.0 35.
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MECHANICAL DATA PWP0028A MXA28A (Rev D) www.ti.
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