Document
LM4835
www.ti.com
SNAS019F – MARCH 1999 – REVISED MAY 2013
LM4835
Stereo 2W Audio Power Amplifiers with DC Volume Control and Selectable Gain
Check for Samples: LM4835
FEATURES
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•23 PC98 Compliant • DC Volume Control Interface • System Beep Detect • Stereo Switchable Bridged/Single-Ended
Power Amplifiers • Selectable Internal/External Gain and Bass
Boost Configurable • “Click and Pop” Suppression Circuitry • Thermal Shutdown Protection Circuitry
APPLICATIONS
• Portable and Desktop Computers • Multimedia Monitors • Portable Radios, PDAs, and Portable TVs
KEY SPECIFICATIONS
• PO at 1% THD+N into 3Ω (LM4835LQ, LM4835MTE) 2.2 W (typ)
• PO at 1% THD+N into 4Ω (LM4835LQ, LM4835MTE) 2.0 W (typ)
• PO at 1% THD+N into 8Ω (LM4835) 1.1 W (typ) 1.0 % (typ)
• Single-Ended Mode - THD+N at 85mW into 32Ω • Shutdown Current 0.7 µA (typ)
DESCRIPTION
The LM4835 is a monolithic integrated circuit that provides DC volume control, and stereo bridged audio power amplifiers capable of producing 2W into 4Ω with less than 1.0% THD or 2.2W into 3Ω with less than 1.0% THD (see Notes below).
Boomer™ audio integrated circuits were designed specifically to provide high quality audio while requiring a minimum amount of external components. The LM4835 incorporates a DC volume control, stereo bridged audio power amplifiers and a selectable gain or bass boost, making it optimally suited for multimedia monitors, portable radios, desktop, and portable computer applications.
The LM4835 features an externally controlled, lowpower consumption shutdown mode, and both a power amplifier and headphone mute for maximum system flexibility and performance.
NOTE: When properly mounted to the circuit board, the LM4835LQ and LM4835MTE will deliver 2W into 4Ω. The LM4835MT will deliver 1.1W into 8Ω. See the Application Information section LM4835LQ and for LM4835MTE usage information.
NOTE: An LM4835LQ and LM4835MTE that have been properly mounted to the circuit board and forced-air cooled will deliver 2.2W into 3Ω.
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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. Boomer is a trademark of Texas Instruments.
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All other trademarks are the property of their respective owners.
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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 © 1999–2013, Texas Instruments Incorporated
LM4835
SNAS019F – MARCH 1999 – REVISED MAY 2013
CONNECTION DIAGRAMS
www.ti.com
Figure 1. 28-Pin WQFN - Top View See NJB0028A Package
BLOCK DIAGRAM
Figure 2. 28-Pin TSSOP - Top View See PW Package
Figure 3. LM4835 Block Diagram
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Product Folder Links: LM4835
Copyright © 1999–2013, Texas Instruments Incorporated
LM4835
www.ti.com
SNAS019F – MARCH 1999 – 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
Storage Temperature
-65°C to +150°C
Input Voltage
Power Dissipation (3) ESD Susceptibility (4) ESD Susceptibility (5)
−0.3V to VDD +0.3V
Internally limited
2000V
200V
Junction Temperature
150°C
Soldering Information
Small Outline Package
Vapor Phase (60 sec.) Infrared (15 sec.)
215°C 220°C
θJC (typ)—LQA028AA θJA (typ)—LQA028AA (6)
θJC (typ)—MTC28
θJA (typ)—MTC28
θJC (typ)—MXA28A θJA (typ)—MXA28A (7) θJA (typ)—MXA28A (8) θJA (typ)—MXA28A (9) θJA (typ)—MXA28A (10)
3.0°C/W 42°C/W 20°C/W 80°C/W
2°C/W 41°C/W 54°C/W 59°C/W 93°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) The maximum power dissipation must be derated at elevated temperatures and is dictated by TJMAX, θ JA, and the ambient temperature TA. The maximum allowable power dissipation is PDMAX = (TJMAX − TA )/θJA. For the LM4835LQ and LM4835MT, TJMAX = 150°C, and the typical junction-to-ambient thermal resistance,.