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LM4953, LM4953SDBD

www.ti.com

SNAS299E –SEPTEMBER 2005–REVISED FEBRUARY 2006

LM4953 Boomer™ Audio Power Amplifier Series Ground-Referenced, Ultra Low Noise,

Ceramic Speaker Driver

Check for Samples: LM4953, LM4953SDBD

FEATURES

DESCRIPTION

The LM4953 is an audio power amplifier designed for

• Pop & Click Circuitry Eliminates Noise During

driving Ceramic Speaker in portable applications.

Turn-On and Turn-Off Transitions

When powered by a 3.6V supply, it is capable of

• Low, 1μA (Max) Shutdown Current

forcing 12.6Vpp across a 2μF + 30Ω bridge-tied-load

• Low, 7mA (Typ) Quiescent Current

(BTL) with less than 1% THD+N.

• 12.6Vpp Mono BTL Output, Load = 2μF+ 30Ω

Boomer audio power amplifiers were designed

specifically to provide high quality output power with a

• Thermal Shutdown

minimal amount of external components. The

• Unity-Gain Stable

LM4953 does not require bootstrap capacitors, or

• External Gain Configuration Capability

snubber circuits. Therefore it is ideally suited for

display applications requiring high power and minimal

APPLICATIONS

size.

• Cellphone

The LM4953 features a low-power consumption

shutdown mode. Additionally, the LM4953 features an

• PDA

internal thermal shutdown protection mechanism.

KEY SPECIFICATIONS

The LM4953 contains advanced pop & click circuitry

that eliminates noises which would otherwise occur

• Quiescent Power Supply Current (V

= 3V),

during turn-on and turn-off transitions.

7mA(Typ)

The LM4953 is unity-gain stable and can be

• BTL Voltage Swing

configured by external gain-setting resistors.

(2μF+30Ω load, 1% THD+N, V

= 3.6V), 12.6V

(Typ)

• Shutdown Current, 1µA (Max)

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 (19 pages)

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LM4953, LM4953SDBD www.ti.com SNAS299E – SEPTEMBER 2005 – REVISED FEBRUARY 2006 LM4953 Boomer™ Audio Power Amplifier Series Ground-Referenced, Ultra Low Noise, Ceramic Speaker Driver Check for Samples: LM4953, LM4953SDBD FEATURES DESCRIPTION • The LM4953 is an audio power amplifier designed for driving Ceramic Speaker in portable applications. When powered by a 3.6V supply, it is capable of forcing 12.6Vpp across a 2μF + 30Ω bridge-tied-load (BTL) with less than 1% THD+N.
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LM4953, LM4953SDBD SNAS299E – SEPTEMBER 2005 – REVISED FEBRUARY 2006 www.ti.com Typical Application 20 k: CPVDD Rf + C3 10 0.39 PF + Ci 20 k: SHUTDOWN *C4 13 Ri Vin1 4.7 PF 1 4.7 PF 2 Undervoltage Lockout, Click/Pop Suppression and Shutdown Control 11 15: + Ceramic Speaker 2 PF 3 Charge Pump C1 2.2 PF + 5 9 - 15: 100 k: 6 4 8 14 C2 2.2 PF 20 k: Figure 1.
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LM4953, LM4953SDBD www.ti.
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LM4953, LM4953SDBD SNAS299E – SEPTEMBER 2005 – REVISED FEBRUARY 2006 www.ti.com Electrical Characteristics VDD = 3.6V The following specifications apply for VDD = 3.6V, AV-BTL = 6dB, ZL = 2μF+30Ω unless otherwise specified. Limits apply to TA = 25°C. See Figure 1. Symbol Parameter Conditions LM4953 Typ (1) Units (Limits) Limit (2) (3) IDD Quiescent Power Supply Current VIN = 0, RLOAD = 2μF+30Ω 8 mA (max) Istandby Quiescent Power Supply Current Auto Standby Mode VIN = 0, ZLOAD = 2μF+30Ω 2.
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LM4953, LM4953SDBD www.ti.com SNAS299E – SEPTEMBER 2005 – REVISED FEBRUARY 2006 Electrical Characteristics VDD = 3.0V The following specifications apply for VDD = 3.0V, AV-BTL = 6dB, ZL = 2μF+30Ω unless otherwise specified. Limits apply to TA = 25°C. See Figure 1. Symbol Parameter Conditions LM4953 Units (Limits) Typ (1) Limit (2) (3) 10 IDD Quiescent Power Supply Current VIN = 0, ZLOAD = 2μF+30Ω 7 Istandby Quiescent Power Supply Current Auto Standby Mode VIN = 0, ZLOAD = 2μF+30Ω 2.
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LM4953, LM4953SDBD SNAS299E – SEPTEMBER 2005 – REVISED FEBRUARY 2006 www.ti.com Typical Performance Characteristics THD+N vs Frequency VDD = 3V, VO = 6Vpp, ZL = 2μF+30Ω 10 10 1 1 THD+N (%) THD+N (%) THD+N vs Frequency VDD = 2V, VO = 2Vpp, ZL = 2μF+30Ω 0.1 0.01 0.01 0.001 20 100 1000 20000 0.001 20 20000 1000 100 FREQUENCY (Hz) FREQUENCY (Hz) Figure 3. Figure 4. THD+N vs Frequency VDD = 3.6V, VO = 8.5Vpp, ZL = 2μF+30Ω THD+N vs Frequency VDD = 4.
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LM4953, LM4953SDBD www.ti.com SNAS299E – SEPTEMBER 2005 – REVISED FEBRUARY 2006 Typical Performance Characteristics (continued) THD+N vs Output Voltage VDD = 4.2V, f = 1kHz, ZL = 2μF+30Ω 10 10 1 1 THD+N (%) THD+N (%) THD+N vs Output Voltage VDD = 3.6V, f = 1kHz, ZL = 2μF+30Ω 0.1 0.01 0.1 0.01 0.001 0.5 1 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 0.
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LM4953, LM4953SDBD SNAS299E – SEPTEMBER 2005 – REVISED FEBRUARY 2006 www.ti.com Typical Performance Characteristics (continued) 12 Supply Current vs Supply Voltage ZL = 2μF+30Ω SUPPLY CURRENT (mA) 10 Full Power Mode 8 6 Auto-Standby Mode 4 2 0 1.5 2 2.5 3 3.5 4 SUPPLY VOLTAGE (V) Figure 15.
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LM4953, LM4953SDBD www.ti.com SNAS299E – SEPTEMBER 2005 – REVISED FEBRUARY 2006 APPLICATION INFORMATION ELIMINATING THE OUTPUT COUPLING CAPACITOR The LM4953 features a low noise inverting charge pump that generates an internal negative supply voltage. This allows the outputs of the LM4953 to be biased about GND instead of a nominal DC voltage, like traditional headphone amplifiers. Because there is no DC component, the large DC blocking capacitors (typically 220µF) are not necessary.
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LM4953, LM4953SDBD SNAS299E – SEPTEMBER 2005 – REVISED FEBRUARY 2006 www.ti.com PDMAX = (TJMAX - TA) / (θJA) (3) Depending on the ambient temperature, TA, of the system surroundings, Equation 3 can be used to find the maximum internal power dissipation supported by the IC packaging. If the result of Equation 2 is greater than that of Equation 3, then either the supply voltage must be decreased, the load impedance increased or TA reduced.
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LM4953, LM4953SDBD www.ti.com SNAS299E – SEPTEMBER 2005 – REVISED FEBRUARY 2006 Charge Pump Capacitor Selection Use low ESR (equivalent series resistance) (<100mΩ) ceramic capacitors with an X7R dielectric for best performance. Low ESR capacitors keep the charge pump output impedance to a minimum, extending the headroom on the negative supply. Higher ESR capacitors result in reduced output power from the audio amplifiers.
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LM4953, LM4953SDBD SNAS299E – SEPTEMBER 2005 – REVISED FEBRUARY 2006 www.ti.com LM4953 DEMO BOARD ARTWORK 12 Figure 16. Top Layer Figure 17. Mid Layer 1 Figure 18. Mid Layer 2 Figure 19.
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LM4953, LM4953SDBD www.ti.com SNAS299E – SEPTEMBER 2005 – REVISED FEBRUARY 2006 Revision History Rev Date Description 1.0 2/18/05 Started D/S by copying LM4926 (DS201161). 1.2 9/13/05 Added the Typ Perf curves and Application Info section. 1.3 9/14/05 Added more Typ Perf curves. First WEB release on the D/S. 1.4 9/19/05 Fixed some typo, then re-released D/S to the WEB. 1.5 11/11/05 Added the WSON boards, then re-released D/S to the WEB... not released on this date.. 1.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE MATERIALS INFORMATION www.ti.com 21-Mar-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 LM4953SD/NOPB WSON NHK 14 1000 178.0 12.4 3.3 4.3 1.0 8.0 12.0 Q1 LM4953SDX/NOPB WSON NHK 14 4500 330.0 12.4 3.3 4.3 1.0 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 21-Mar-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM4953SD/NOPB WSON NHK 14 1000 203.0 190.0 41.0 LM4953SDX/NOPB WSON NHK 14 4500 367.0 367.0 35.
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MECHANICAL DATA NHK0014A SDA14A (Rev A) www.ti.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.
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