Datasheet

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LM4995, LM4995TMBD

www.ti.com

SNAS329G –APRIL 2006–REVISED APRIL 2013

LM4995 1.3 W Audio Power Amplifier

Check for Samples: LM4995, LM4995TMBD

FEATURES

DESCRIPTION

The LM4995 is an audio power amplifier primarily

• Available in Space-Saving 0.4mm Pitch

designed for demanding applications in mobile

DSBGA Package

phones and other portable communication device

• Ultra Low Current Shutdown Mode

applications. It is capable of delivering 1.2W of

• BTL Output Can Drive Capacitive Loads

continuous average power to an 8Ω BTL load with

less than 1% distortion (THD+N) from a 5V

power

• Improved Click and Pop Circuitry Eliminates

supply.

Noise during Turn-On and Turn-Off Transitions

Boomer audio power amplifiers were designed

• 2.4 - 5.5V Operation

specifically to provide high quality output power with a

• No Output Coupling Capacitors, Snubber

minimal amount of external components. The

Networks or Bootstrap Capacitors Required

LM4995 does not require output coupling capacitors

• Unity-Gain Stable

or bootstrap capacitors, and therefore is ideally suited

for mobile phone and other low voltage applications

• External Gain Configuration Capability

where minimal power consumption is a primary

• WSON Package: 0.5mm Pitch, 3 x 3 mm

requirement.

The LM4995 features a low-power consumption

APPLICATIONS

shutdown mode, which is achieved by driving the

• Mobile Phones

shutdown pin with logic low. Additionally, the LM4995

• PDAs

features an internal thermal shutdown protection

mechanism.

• Portable electronic devices

The LM4995 contains advanced click and pop

KEY SPECIFICATIONS

circuitry which eliminates noise which would

otherwise occur during turn-on and turn-off

• PSRR at 3.6V (217Hz & 1kHz): 75 dB

transitions.

• Output Power at 5.0V, 1% THD+N, 8Ω:

The LM4995 is unity-gain stable and can be

1.3 W (typ)

configured by external gain-setting resistors.

• Output Power at 3.6V, 1% THD+N, 8Ω:

625 mW (typ)

• Shutdown Current: 0.01µA (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 (22 pages)

PAGE 1
LM4995, LM4995TMBD www.ti.com SNAS329G – APRIL 2006 – REVISED APRIL 2013 LM4995 1.3 W Audio Power Amplifier Check for Samples: LM4995, LM4995TMBD FEATURES DESCRIPTION • The LM4995 is an audio power amplifier primarily designed for demanding applications in mobile phones and other portable communication device applications. It is capable of delivering 1.2W of continuous average power to an 8Ω BTL load with less than 1% distortion (THD+N) from a 5VDC power supply.
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LM4995, LM4995TMBD SNAS329G – APRIL 2006 – REVISED APRIL 2013 www.ti.com TYPICAL APPLICATION Figure 1. Typical Audio Amplifier Application Circuit CONNECTION DIAGRAM xxx xxx 3 2 1 -IN GND BYP A VO1 GND +IN SHUTDOWN 1 8 VO2 BYPASS 2 7 GND +IN 3 6 VDD -IN 4 5 VO1 VDD VO2 SHDN B C Figure 3. WSON (Top View) See NGQ0008A Package Figure 2. DSBGA (Top View) See YFQ0009 Package These devices have limited built-in ESD protection.
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LM4995, LM4995TMBD www.ti.com SNAS329G – APRIL 2006 – REVISED APRIL 2013 ABSOLUTE MAXIMUM RATINGS (1) (2) Supply Voltage (3) 6.0V −65°C to +150°C Storage Temperature −0.3V to VDD +0.3V Input Voltage Power Dissipation (4) (5) ESD Susceptibility Internally Limited (6) 2000V ESD Susceptibility (7) 200V Junction Temperature 150°C Thermal Resistance θJA (DSBGA) θJA (WSON) (1) (2) (3) (4) (5) (6) (7) 96.
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LM4995, LM4995TMBD SNAS329G – APRIL 2006 – REVISED APRIL 2013 www.ti.com ELECTRICAL CHARACTERISTICS VDD = 5V (1) (2) The following specifications apply for the circuit shown in Figure 1, unless otherwise specified. Limits apply for TA = 25°C. Symbol Parameter Conditions LM4995 Typical (3) Limit (4) (5) Units (Limits) 2.5 mA (max) VIN = 0V, Io = 0A, No Load 1.5 VIN = 0V, Io = 0A, 8Ω Load 1.8 Shutdown Current VSD = VGND 0.
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LM4995, LM4995TMBD www.ti.com SNAS329G – APRIL 2006 – REVISED APRIL 2013 ELECTRICAL CHARACTERISTICS VDD = 3.0V (1) (2) The following specifications apply for the circuit shown in Figure 1, unless otherwise specified. Limits apply for TA = 25°C. Symbol Parameter LM4995 Conditions Typical (3) Limit (4) (5) Units (Limits) VIN = 0V, Io = 0A, No Load 1.3 mA VIN = 0V, Io = 0A, 8Ω Load 1.6 mA Shutdown Current VSD = VGND 0.
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LM4995, LM4995TMBD SNAS329G – APRIL 2006 – REVISED APRIL 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS THD+N vs Output Power VDD = 3V, RL = 8Ω THD+N vs Output Power VDD = 3.6V, RL = 8Ω 10 10 5 5 2 2 1 THD+N (%) THD+N (%) 1 0.5 0.2 0.1 0.05 0.05 0.02 0.02 20 50 100 200 500 100 200 500 Figure 4. Figure 5. THD+N vs Output Power VDD = 5V, RL = 8Ω THD+N vs Frequency VDD = 3V, RL = 8Ω, f = 1kHz, PO = 250mW 10 5 5 2 2 1000 1 0.5 0.2 0.5 0.2 0.1 0.1 0.05 0.05 0.02 0.
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LM4995, LM4995TMBD www.ti.com SNAS329G – APRIL 2006 – REVISED APRIL 2013 TYPICAL PERFORMANCE CHARACTERISTICS (continued) PSRR vs Frequency VDD = 3V, RL = 8Ω -10 -10 -20 -20 -30 -30 -40 -50 -60 -40 -50 -60 -70 -70 -80 -80 -90 -90 -100 20 50 100 200 500 1k 2k PSRR vs Frequency VDD = 3.6V, RL = 8Ω 0 PSRR (dB) PSRR (dB) 0 -100 20 5k 10k 20k 50 100 200 5k 10k 20k FREQUENCY (Hz) FREQUENCY (Hz) 0 500 1k 2k Figure 10. Figure 11.
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LM4995, LM4995TMBD SNAS329G – APRIL 2006 – REVISED APRIL 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) Output Level vs Frequency Response (Three different caps) +1 Ci = 1PF (tantulum) 0 Ci = 1PF (ceramic) 90 SUPPLY CURRENT (mA) OUTPUT LEVEL (dB) -1 -2 -3 Shutdown Voltage VSDIH VDD = 3V 100 Ci = 0.33PF (tantulum) -4 -5 -6 -7 -8 80 70 60 50 40 30 20 10 -9 -10 20 0 50 100 200 500 1k 2k 0 5k 10k 20k 0.2 FREQUENCY (Hz) 1.0 1.2 Figure 17. Shutdown Voltage VSDIH VDD = 3.
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LM4995, LM4995TMBD www.ti.com SNAS329G – APRIL 2006 – REVISED APRIL 2013 TYPICAL PERFORMANCE CHARACTERISTICS (continued) Shutdown Voltage VSDIL VDD = 5V 2000 90 1800 80 1600 OUTPUT POWER (mW) SUPPLY CURRENT (mA) 100 70 60 50 40 30 20 Output Power vs Supply Voltage RL = 8Ω 1400 THD+N = 10% 1200 1000 800 THD+N = 1% 600 400 10 200 0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 0 2.0 SHUTDOWN VOLTAGE (V) Figure 22. 3.0 4.0 5.0 6.0 VOLTAGE SUPPLY (V) Figure 23.
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LM4995, LM4995TMBD SNAS329G – APRIL 2006 – REVISED APRIL 2013 www.ti.com APPLICATION INFORMATION BRIDGE CONFIGURATION EXPLANATION As shown in Figure 1, the LM4995 has two internal operational amplifiers. 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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LM4995, LM4995TMBD www.ti.com SNAS329G – APRIL 2006 – REVISED APRIL 2013 SHUTDOWN FUNCTION In order to reduce power consumption while not in use, the LM4995 contains shutdown circuitry that is used to turn off the amplifier's bias circuitry. This shutdown feature turns the amplifier off when logic low is placed on the shutdown pin. By switching the shutdown pin to GND, the LM4995 supply current draw will be minimized in idle mode. Idle current is measured with the shutdown pin connected to GND.
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LM4995, LM4995TMBD SNAS329G – APRIL 2006 – REVISED APRIL 2013 www.ti.com AUDIO POWER AMPLIFIER DESIGN A 1W/8Ω AUDIO AMPLIFIER Given: Power Output 1 Wrms Load Impedance 8Ω Input Level 1 Vrms Input Impedance 20 kΩ Bandwidth 100 Hz–20 kHz ± 0.25 dB A designer must first determine the minimum supply rail to obtain the specified output power. By extrapolating from the Output Power vs Supply Voltage graphs in the TYPICAL PERFORMANCE CHARACTERISTICS section, the supply rail can be easily found.
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LM4995, LM4995TMBD www.ti.com SNAS329G – APRIL 2006 – REVISED APRIL 2013 Figure 24. HIGHER GAIN AUDIO AMPLIFIER Figure 25.
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LM4995, LM4995TMBD SNAS329G – APRIL 2006 – REVISED APRIL 2013 www.ti.com Figure 26. REFERENCE DESIGN BOARD SCHEMATIC PCB LAYOUT GUIDELINES This section provides practical guidelines for mixed signal PCB layout that involves various digital/analog power and ground traces. Designers should note that these are only "rule-of-thumb" recommendations and the actual results will depend heavily on the final layout.
PAGE 15
LM4995, LM4995TMBD www.ti.com SNAS329G – APRIL 2006 – REVISED APRIL 2013 REVISION HISTORY Rev Date Description 1.0 04/05/06 Initial WEB released of the datasheet. 1.1 05/17/06 Added the SD package. 1.2 08/07/06 Text edits. 1.3 08/22/06 Edited the THD+N Typical values on the 3 EC tables, then re-released the D/S to the WEB (per Allan S.). 1.4 09/11/07 Updated the SD pkg. diagram.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 26-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 11-Oct-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing LM4995SD/NOPB WSON NGQ 8 LM4995TM/NOPB DSBGA YFQ LM4995TMX/NOPB DSBGA YFQ SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 1000 178.0 12.4 3.3 3.3 1.0 8.0 12.0 Q1 9 250 178.0 8.4 1.35 1.35 0.76 4.0 8.0 Q1 9 3000 178.0 8.4 1.35 1.35 0.76 4.0 8.
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PACKAGE MATERIALS INFORMATION www.ti.com 11-Oct-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM4995SD/NOPB WSON NGQ 8 1000 210.0 185.0 35.0 LM4995TM/NOPB DSBGA YFQ 9 250 210.0 185.0 35.0 LM4995TMX/NOPB DSBGA YFQ 9 3000 210.0 185.0 35.
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MECHANICAL DATA NGQ0008A SDA08A (Rev A) www.ti.
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MECHANICAL DATA YFQ0009xxx D 0.600±0.075 E TMD09XXX (Rev A) D: Max = 1.24 mm, Min = 1.18 mm E: Max = 1.24 mm, Min = 1.18 mm 4215077/A NOTES: A. All linear dimensions are in millimeters. Dimensioning and tolerancing per ASME Y14.5M-1994. B. This drawing is subject to change without notice. www.ti.
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