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LM4992 Dataheets PDF



Part Number LM4992
Manufacturers Texas Instruments
Logo Texas Instruments
Description 420mW Stereo Cell Phone Audio Amplifier
Datasheet LM4992 DatasheetLM4992 Datasheet (PDF)

LM4992, LM4992SDBD www.ti.com SNAS220B – NOVEMBER 2003 – REVISED MAY 2013 LM4992 420mW Stereo Cell Phone Audio Amplifier Check for Samples: LM4992, LM4992SDBD FEATURES 1 •2 Available in Space-Saving WSON Package • Ultra Low Current Shutdown Mode • BTL Output Can Drive Capacitive Loads • Improved Click and Pop Circuitry Eliminates Noise During Turn-On and Turn-Off Transitions • 2.2 - 5.5V Operation • No Output Coupling Capacitors, Snubber Networks or Bootstrap Capacitors Required • Unity-Gai.

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LM4992, LM4992SDBD www.ti.com SNAS220B – NOVEMBER 2003 – REVISED MAY 2013 LM4992 420mW Stereo Cell Phone Audio Amplifier Check for Samples: LM4992, LM4992SDBD FEATURES 1 •2 Available in Space-Saving WSON Package • Ultra Low Current Shutdown Mode • BTL Output Can Drive Capacitive Loads • Improved Click and Pop Circuitry Eliminates Noise During Turn-On and Turn-Off Transitions • 2.2 - 5.5V Operation • No Output Coupling Capacitors, Snubber Networks or Bootstrap Capacitors Required • Unity-Gain Stable • External Gain Configuration Capability APPLICATIONS • Mobile Phones • PDAs • Portable Electronic Devices KEY SPECIFICATIONS • Improved PSRR at 217Hz & 1KHz: 64 dB (1KHz) • Stereo Output Power at 5.0V, 1% THD, 8Ω: 1.07 W (typ) • Stereo Output Power at 3.3V, 1% THD, 8Ω: 420 mW (typ) • Shutdown Current, Vdd = 3.3V: 0.2 µA (typ) DESCRIPTION The LM4992 is a stereo audio power amplifier primarily designed for demanding applications in mobile phones and other portable communication device applications. It is capable of delivering 1 watt, per channel, of continuous average power to an 8Ω BTL load with less than 1% distortion (THD+N) from a 5VDC power supply. Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. The LM4992 does not require output coupling capacitors or bootstrap capacitors, and therefore is ideally suited for mobile phone and other low voltage applications where minimal power consumption is a primary requirement. The LM4992 features independent shutdown control for each channel and a low-power consumption shutdown mode, which is achieved by driving both shutdown pins with logic low. Additionally, the LM4992 features an internal thermal shutdown protection mechanism. The LM4992 contains advanced click and pop circuitry which eliminates noise which would otherwise occur during turn-on and turn-off transitions. The LM4992 is unity-gain stable and can be configured by external gain-setting resistors. Connection Diagram 14 Pin WSON (Top View) See Package Number NHK0014A 1 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. All trademarks are the property of their respective owners. 2 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. Copyright © 2003–2013, Texas Instruments Incorporated LM4992, LM4992SDBD SNAS220B – NOVEMBER 2003 – REVISED MAY 2013 TYPICAL APPLICATION www.ti.com V DD Audio Input Rf 20k Ri 20k Ci 0.39 PF Cs 1 PF -IN +IN + Vo1 - 20 k: 20 k: RL 8: V IH V IL Shutdown Control CB 1.0 PF Bypass Shutdown BIAS V DD /2 - A V = -1 + + Vo1 Shutdown Control V IH VIL CB 1.0 PF Shutdown BIAS Bypass VDD /2 + A V = -1 - Vo2 + Audio Input Ri 20k Ci 0.39 PF Rf 20k +IN + -IN - 20 k: RL 8: 20 k: Vo2 - GND Figure 1. Typical Audio Amplifier Application Circuit 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. 2 Submit Documentation Feedback Copyright © 2003–2013, Texas Instruments Incorporated Product Folder Links: LM4992 LM4992SDBD LM4992, LM4992SDBD www.ti.com SNAS220B – NOVEMBER 2003 – REVISED MAY 2013 ABSOLUTE MAXIMUM RATINGS (1)(2) Supply Voltage (3) 6.0V Storage Temperature −65°C to +150°C Input Voltage Power Dissipation (4) (5) ESD Susceptibility (6) ESD Susceptibility (7) −0.3V to VDD +0.3V Internally Limited 2000V 200V Junction Temperature 150°C Thermal Resistance θJA (WSON) 103°C/W (1) Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is functional, but do not ensure specific performance limits. Electrical Characteristics state DC and AC electrical specifications under particular test conditions which ensure specific performance limits. This assumes that the device is within the Operating Ratings. Specifications are not ensured for parameters where no limit is given, however, the typical value is a good indication of device performance. (2) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and specifications. (3) If the product is in Shutdown mode and VDD exceeds 6V (to a max of 8V VDD), then most of the excess current will flow through the ESD protection circuits. If the source impedance limits the current to a max of 10mA, then the device will be protected. If the device is enabled when VDD is greater than.


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